U.S. patent application number 14/268205 was filed with the patent office on 2014-11-06 for tri-axis close loop feedback controlling module for electromagnetic lens driving device.
This patent application is currently assigned to TDK Taiwan Corp.. The applicant listed for this patent is TDK Taiwan Corp.. Invention is credited to Shu Shan Chen, Chao Chang Hu, Wen Chang Lin.
Application Number | 20140327965 14/268205 |
Document ID | / |
Family ID | 51841312 |
Filed Date | 2014-11-06 |
United States Patent
Application |
20140327965 |
Kind Code |
A1 |
Chen; Shu Shan ; et
al. |
November 6, 2014 |
Tri-Axis Close Loop Feedback Controlling Module for Electromagnetic
Lens Driving Device
Abstract
The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device comprises a 6-pin Hall element.
Two pins of the Hall element are coupled to an auto-focus module
for providing a current to drive the auto-focus module to conduct
auto-focusing operations along the Z-axis; while other four pins of
the Hall element are coupled to a control unit. The control unit
detects the X-Y axial positions of the auto-focus module relative
to an OIS module and generates a control signal which is then sent
to the Hall element. Therefore, the Hall element not only can
provide its own feedback controlling function according to the
Z-axial position of lens, but also can drive the auto-focus module
based on the control signal corresponding to the X-Y axial
positions of the auto-focus module, so as to achieve the goal of
tri-axis close-loop feedback controlling for the electromagnetic
lens driving device.
Inventors: |
Chen; Shu Shan; (Taoyuan
County, TW) ; Hu; Chao Chang; (Taoyuan County,
TW) ; Lin; Wen Chang; (Taoyuan County, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
TDK Taiwan Corp. |
Taipei City |
|
TW |
|
|
Assignee: |
TDK Taiwan Corp.
Taipei City
TW
|
Family ID: |
51841312 |
Appl. No.: |
14/268205 |
Filed: |
May 2, 2014 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
61819737 |
May 6, 2013 |
|
|
|
Current U.S.
Class: |
359/557 |
Current CPC
Class: |
G02B 7/08 20130101; G02B
7/09 20130101; G03B 2205/0015 20130101; G02B 27/646 20130101; G02B
13/001 20130101; H04N 5/23287 20130101 |
Class at
Publication: |
359/557 |
International
Class: |
G02B 7/04 20060101
G02B007/04; G02B 27/64 20060101 G02B027/64 |
Claims
1. A tri-axis close-loop feedback controlling module for
electromagnetic lens driving device, comprising: a lens holder for
holding a lens; a movable frame for receiving the lens holder in
such a manner that the lens holder is movable relative to the
movable frame along a Z-axis direction; an electromagnetic driving
module, furnished between the movable frame and the lens holder for
driving the lens holder to move within the movable frame along the
Z-axis direction; an optical image stabilization (OIS) module for
driving the movable frame together with the lens holder to perform
bi-directional movements along a X-axis direction and a Y-axis
direction; wherein the X-axis, Y-axis and Z-axis are perpendicular
to each other; a control unit, coupled to the OIS module; the
control unit being able to detect and control operations of the OIS
module so as to generate a control signal according to the
operations of the OIS module; and a Hall element having at least
six pins; wherein, two of the at least six pins are coupled with
the electromagnetic driving module for supplying a current to the
electromagnetic driving module in order to control operations of
the electromagnetic driving module; other four of the at least six
pins are coupled with the control unit for receiving the control
signal from the control unit in order to control the current
supplied to the electromagnetic driving module based on the control
signal, so as to achieve the function of tri-axis close-loop
feedback controlling the electromagnetic driving module.
2. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 1, further comprising:
a first circuit board; the control unit being furnished on the
first circuit board and coupled with the OIS module; and an
electric coupling structure; the Hall element being coupled with
the electromagnetic driving module and the control unit be means of
the electric coupling structure; wherein, the electric coupling
structure comprises a first spring plate located at one side of the
lens holder along the Z-axis direction; the first spring plate
comprises at least four independent and separated first spring
members; each one of these first spring members comprises a first
inner rim for flexibly retaining a top position of the lens holder
along the Z-axis direction and a first contact which is connected
with one suspension wire; each one of the suspension wires extends
from the first spring members toward the first circuit board and
couples to the control unit; the Hall element is coupled with the
four first spring members and the electromagnetic driving module,
and can receive a control signal from the control unit via the
suspension wires in order to control and adjust a current provided
by the Hall element to the electromagnetic driving module.
3. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 2, wherein the first
spring plate is in the form of hollowed out thin metal plate; in
addition, each one of the first spring members of first spring
plate comprises: a first outer rim connected to the movable frame,
a first inner rim connected to the lens holder, at least one first
inner string extending and connecting between the first outer rim
and the first inner rim, and a first contact located at the first
outer rim; each one of the suspension wires has its one end thereof
being correspondingly connected to one of the first contacts.
4. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 3, wherein the
electromagnetic lens driving device further comprises a second
circuit board; the Hall element is furnished on the second circuit
hoard; a sensing magnet for Z-axis position is furnished on the
lens holder at a location corresponding to the Hall element; in
addition, the end of each suspension wire which is connected to the
first contact is coupled with the second circuit board, and thus is
further coupled to one of the pins of the Hall element via the
second circuit board.
5. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 4, wherein the
electric coupling structure further comprises a second spring plate
located at a lower side of the lens holder along the Z-axis
direction opposite to the first spring plate; the second spring
plate comprises at least two individual and separated second spring
member; each one of the second spring members comprises: a second
outer rim connected to the movable frame, a second inner rim fixed
on the lens holder for flexibly retaining a bottom position of the
lens holder along the Z-axis direction, at least one second inner
string extending and connecting between the second outer rim and
the second inner rim, and a second contact located at the second
outer rim; wherein the electromagnetic driving module comprises at
least a driving coil furnished on the lens holder and at least two
driving magnets mounted on the movable frame and corresponding to
the driving coil; wherein the second inner rim of each second
spring member is electric coupled with the driving coil of the
electromagnetic driving module; in addition, the second contact of
each second spring member is coupled to the second circuit board
and thus is further coupled with one of the pins of the Hall
element.
6. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 5, wherein the second
contact of each one of the second spring members is coupled to the
second circuit board by means of one of the following structures:
bending a thin elongated extending part extended from the second
contact toward the second circuit so as to let an end of the
extending part connect to the second circuit board, and soldering a
connecting wire at the second contact and let an end of the
connecting wire connect to the second circuit board.
7. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 4, wherein the first
spring plate includes at least six independent and separated first
spring members; wherein, among these six first spring members,
there are four first spring members that each of these four first
spring members includes the first contact which is coupled with the
control unit by means of the suspension wire; while the other two
first spring members do not connect to the suspension wires and are
coupled to the electromagnetic driving module via the first inner
rim; wherein the electromagnetic driving module comprises at least
a driving coil furnished on the lens holder and at least two
driving magnets mounted on the movable frame and corresponding to
the driving coil; wherein the first inner rim of each one of the
other two first spring members is coupled with the coil of the
electromagnetic driving module; in addition, the first outer rim of
each one of the other two first spring members is coupled to the
second circuit board and is further coupled to one of the pins of
the Hall element in order to supply the current to the
electromagnetic driving module in order to control operations of
the electromagnetic driving module.
8. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 2, wherein the OIS
module comprises: at least a first stabilizing coil furnished on
the first circuit board and coupled to the control unit; at least a
second stabilizing coil furnished on the first circuit board and
are perpendicular to the first stabilizing coils; in addition, the
second stabilizing coils being coupled to the control unit; at
least a first stabilizing magnet mounted on the movable frame and
corresponding to the first stabilizing coil; at least a second
stabilizing magnet mounted on the movable frame and corresponding
to the second stabilizing coil; and at least two position sensors
mounted on the first circuit board and coupled to the control unit;
the at least two position sensors being used to detect the position
of the movable frame relative to the first circuit board along the
X-axis direction and the Y-axis direction;
9. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 8, the first and
second stabilizing magnets are the same with the driving magnets of
the electromagnetic driving module.
10. A tri-axis close-loop feedback controlling module for
electromagnetic lens driving device, comprising: a lens holder for
holding a lens; a movable frame for receiving the lens holder in
such a manner that the lens holder is movable relative to the
movable frame along a Z-axis direction; an electromagnetic driving
module, furnished between the movable frame and the lens holder for
driving the lens holder to move within the movable frame along the
Z-axis direction; a first circuit board; an optical image
stabilization (OIS) module furnished between the first circuit
board and the movable frame for driving the movable frame together
with the lens holder to perform bi-directional movements along a
X-axis direction and a Y-axis direction; wherein the X-axis, Y-axis
and Z-axis are perpendicular to each other; a control unit, coupled
to the OIS module; the control unit being able to detect and
control operations of the OIS module so as to generate a control
signal according to the operations of the OIS module; a first
spring plate located at one side of the lens holder along the
Z-axis direction; the first spring plate comprising at least four
independent and separated first spring members; each one of these
first spring members comprising a first inner rim for flexibly
retaining a top position of the lens holder along the Z-axis
direction and a first contact which is connected with one
suspension wire; each one of the suspension wires being extending
from the first spring members toward the first circuit board and
coupling to the control unit; and a Hall element coupled with the
four first spring members and the electromagnetic driving module,
and being able to receive a control signal from the control unit
via the suspension wires in order to control and adjust a current
provided by the Hall element to the electromagnetic driving
module.
11. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 10, wherein the Hall
element has at least six pins; wherein, two of the at least six
pins are coupled with the electromagnetic driving module for
supplying the current to the electromagnetic driving module in
order to control operations of the electromagnetic driving module;
other four of the at least six pins are coupled with the control
unit for receiving the control signal from the control unit in
order to control the current supplied to the electromagnetic
driving module based on the control signal.
12. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 11, wherein the first
spring plate is in the form of hollowed out thin metal plate; in
addition, each one of the first spring members of first spring
plate comprises: a first outer rim connected to the movable frame,
a first inner rim connected to the lens holder, at least one first
inner string extending and connecting between the first outer rim
and the first inner rim, and a first contact located at the first
outer rim; each one of the suspension wires has its one end thereof
being correspondingly connected to one of the first contacts.
13. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 12, wherein the
electromagnetic lens driving device further comprises a second
circuit board; the Hall element is furnished on the second circuit
board; a sensing magnet for Z-axis position is furnished on the
lens holder at a location corresponding to the Hall element, in
addition, the end of each suspension wire which is connected to the
first contact is coupled with the second circuit board, and thus is
further coupled to one of the pins of the Hall element via the
second circuit board.
14. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 13, wherein the
electric coupling structure further comprises a second spring plate
located at a lower side of the lens holder along the Z-axis
direction opposite to the first spring plate; the second spring
plate comprises at least two individual and separated second spring
member; each one of the second spring members comprises: a second
outer rim connected to the movable frame, a second inner rim fixed
on the lens holder for flexibly retaining a bottom position of the
lens holder along the Z-axis direction, at least one second inner
string extending and connecting between the second outer rim and
the second inner rim, and a second contact located at the second
outer rim; wherein the electromagnetic driving module comprises at
least a driving coil furnished on the lens holder and at least two
driving magnets mounted on the movable frame and corresponding to
the driving coil; wherein the second inner rim of each second
spring member is electric coupled with the driving coil of the
electromagnetic driving module; in addition, the second contact of
each second spring member is coupled to the second circuit board
and thus is further coupled with one of the pins of the Hall
element.
15. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 14, wherein the second
contact of each one of the second spring members is coupled to the
second circuit board by means of one of the following structures:
bending a thin elongated extending part extended from the second
contact toward the second circuit so as to let an end of the
extending part connect to the second circuit board, and soldering a
connecting wire at the second contact and let an end of the
connecting wire connect to the second circuit board.
16. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 13, wherein the first
spring plate includes at least six independent and separated first
spring members; wherein, among these six first spring members,
there are four first spring members that each of these four first
spring members includes the first contact which is coupled with the
control unit by means of the suspension wire; while the other two
first spring members do not connect to the suspension wires and are
coupled to the electromagnetic driving module via the first inner
rim; wherein the electromagnetic driving module comprises at least
a driving coil furnished on the lens holder and at least two
driving magnets mounted on the movable frame and corresponding to
the driving coil; wherein the first inner rim of each one of the
other two first spring members is coupled with the coil of the
electromagnetic driving module; in addition, the first outer rim of
each one of the other two first spring members is coupled to the
second circuit board and is further coupled to one of the pins of
the Hall element in order to supply the current to the
electromagnetic driving module in order to control operations of
the electromagnetic driving module.
17. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 11, wherein the OIS
module comprises: at least a first stabilizing coil furnished on
the first circuit board and coupled to the control unit; at least a
second stabilizing coil furnished on the first circuit board and
are perpendicular to the first stabilizing coils; in addition, the
second stabilizing coils being coupled to the control unit; at
least a first stabilizing magnet mounted on the movable frame and
corresponding to the first stabilizing coil; at least a second
stabilizing magnet mounted on the movable frame and corresponding
to the second stabilizing coil; and at least two position sensors
mounted on the first circuit board and coupled to the control unit;
the at least two position sensors being used to detect the position
of the movable frame relative to the first circuit board along
X-axis direction and the Y-axis direction.
18. The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device of claim 17, wherein, the first
and second stabilizing magnets are the same with the driving
magnets of the electromagnetic driving module.
Description
[0001] This is a non-provisional application of PPA Ser. No.
61/819,737 filed on 2013 May 6, whose disclosures are incorporated
by this reference as though fully set forth herein.
BACKGROUND OF INVENTION
[0002] 1. Field of the Invention
[0003] The invention refers to a tri-axis close-loop feedback
controlling module for electromagnetic lens driving device, which
employs a 6-pin Hall element to allow the electromagnetic lens
driving device to control the focusing operations of the auto-focus
module along the Z-axis based on a control signal generated
according to the X-and-Y axial positions of the auto-focus module,
so as to achieve the functions of tri-axis close-loop feedback
control.
[0004] 2. Description of the Prior Art
[0005] Digital photography technology has been widely applied to
most of the portable electronic devices such as the cellular
phones. Various miniaturized techniques in the lens module are
involved to make all these applications possible; in particular,
the voice coil motor (VCM) technique. The VCM introduces a
combination of coiled magnets and spring plates to drive a lens to
move back and forth along a photo axis for image-capturing, so as
to perform auto-zooming and/or auto-focusing of the lens module.
Further, in this trend of demanding for devices capable of
high-level photographing functions, photographic quality and
various camera functions such as thousand pixels, anti-hand shake
ability and so on are equipped to distinguish high-end camera from
cost-down level. However, in an optical system composed of an optic
lens module, such as a camera system or a video recorder system,
hand shake or some external situations usually occur to alter
optical path so as to degrade the imaging upon the
image-compensation module and further to obscure the formation of
the images. A conventional resort to resolve this problem is to
introduce a further compensation mechanism for overcoming possible
shaking during the imaging. Such a compensation mechanism can be
either digital or optical. State of the art digital compensation
mechanism is to analyze and process the digital imaging data
capturing by the image-compensation module, so as to obtain a
clearer digital image. Such a mechanism is also usually called as a
digital image stabilization (DIS) mechanism. On the other hand, the
optical compensation mechanism, usually called as an optical image
stabilization (OIS) mechanism, is to add a shake-compensation
module upon the lens module or the image-compensation module.
[0006] However, conventional technologies usually employ two
different and yet independent control circuitries for the feedback
circuits of the auto-focus module and the OIS module in the same
camera device. That means, one control circuitry is used for
receiving feedback signals of the auto-focus module and also
controlling the auto-focus module based on the feedback signals,
while another control circuitry is used for controlling the OIS
module based on the feedback signals of the OIS module. More
particularly, in the conventional technologies, a feedback circuit
is individually furnished for detecting and generating a feedback
signal according to the position and movement of the lens along its
optical path (usually also called as the Z-axis), and thus the
auto-focus module can control and drive the lens to move along the
Z-axis according to the feedback signal so as to conduct
auto-focusing operations; in the other hand, another feedback
circuit is individually furnished for detecting and generating
another feedback signal according to the position and movement of
the lens along a horizontal plane perpendicular to the optical path
(usually also called as the X-Y axial plane), and thus the OIS
module can control and drive the lens to move along the X-Y axes
according to said another feedback signal so as to conduct OIS
operations. In the conventional technologies, the auto-focus module
cannot receive any feedback signals from the OIS module when
performing the Z-axial auto-focusing operations. However, when the
OIS module is performing the OIS operations in order to compensate
the biased position of the lens caused by shakings, the OIS module
will move the X and Y axial positions of the lens, and thus the
precise focusing position (Z-axial position) of the lens will also
be changed accordingly. Which means, when the OIS module is
performing the OIS operations, the auto-focus module is also
required to perform and adjust its auto-focusing operations
continuously. Unfortunately, because conventional technologies use
two different and independent control and feedback circuits for the
auto-focus module and OIS module to detect and control the
movements of lens in the Z-axis and X-Y axes respectively, thus the
responding and interacting speeds of the auto-focus module is
relatively slower and delayed, which will cause delayed focusing
operations when shakings occur. In addition, because the entire
lens module (including lens and auto-focus module) is movable
horizontally relative to the OIS module, the circuitry design is
very difficult for conventional technologies if someone try to
integrate the feedback circuit of the auto-focus module with the
feedback circuit of the OIS module into one single circuitry.
SUMMARY OF THE INVENTION
[0007] Accordingly, it is the primary object of the present
invention to provide a tri-axis close-loop feedback controlling
module for electromagnetic lens driving device which comprises a
6-pin Hall element. Two pins of the 6-pin Hall element are coupled
to the auto-focus module for providing a current to the auto-focus
module in order to drive the auto-focus module to conduct the
auto-focusing operations along the X-axis; while other four pins
thereof are coupled to a control unit. The control unit can detect
the signals generated by the OIS module to obtain the X-Y axial
positions of the auto-focus module relative to the OIS module, so
as to generate a control signal according to the X-Y axial position
of the auto-focus module, and then send the control signal to the
6-pin Hall element. Therefore, the 6-pin Hall element not only can
provide its own feedback controlling function according to the
Z-axial position of lens, but also can accept the control signal
from the control unit and then providing the current for driving
the auto-focus module based on the control signal from the control
unit, so as to achieve the goal of tri-axis close-loop feedback
controlling for the electromagnetic lens driving device.
[0008] Another object of the present invention is to provide a
tri-axis close-loop feedback controlling module for electromagnetic
lens driving device, which comprises a novel electric coupling
structure to couple the six pins of the 6-pin Hall element with the
circuitries of both the auto-focus module and the OIS module that
are movable relative to each other, such that the goal of tri-axis
close-loop feedback controlling for the electromagnetic lens
driving device can be achieved.
[0009] In order to achieve aforementioned objects, the present
invention discloses a tri-axis close-loop feedback controlling
module for electromagnetic lens driving device, which
comprises:
[0010] a lens holder for holding a lens;
[0011] a movable frame for receiving the lens holder in such a
manner that the lens holder is movable relative to the movable
frame along a Z-axis direction;
[0012] an electromagnetic driving, module, furnished between the
movable frame and the lens holder for driving the lens holder to
move within the movable frame along the Z-axis direction;
[0013] an optical image stabilization (OIS) module for driving the
movable frame together with the lens holder to perform
bi-directional movements along a X-axis direction and a Y-axis
direction; wherein the X-axis, Y-axis and Z-axis are perpendicular
to each other;
[0014] a control unit, coupled to the OIS module; the control unit
being able to detect and control operations of OIS module so as to
generate a control signal according to the operations of the OIS
module; and
[0015] a Hall element having at least six pins; wherein, two of the
at least six pins are coupled with the electromagnetic driving
module for supplying a current to the electromagnetic driving
module in order to control operations of the electromagnetic
driving module; other four of the at least six pins are coupled
with the control unit for receiving the control signal from the
control unit in order to control the current supplied to the
electromagnetic driving, module based on the control signal, so as
to achieve the function of tri-axis close-loop feedback
controlling, the electromagnetic driving module.
[0016] In a preferred embodiment, the tri-axis close-loop feedback
controlling module for electromagnetic lens driving device further
comprises:
[0017] a first circuit board; the control unit being furnished on
the first circuit board and coupled with the OIS module; and
[0018] an electric coupling structure; the Hall element being
coupled with the electromagnetic driving module and the control
unit be means of the electric coupling structure;
[0019] wherein, the electric coupling structure comprises a first
spring plate located at one side of the lens holder along the
Z-axis direction; the first spring plate comprises at least four
independent and separated first spring members; each one of these
first spring members comprises a first inner rim for flexibly
retaining a top position of the lens holder along the Z-axis
direction and a first contact which is connected with one
suspension wire; each one of the suspension wires extends from the
first spring members toward the first circuit board and couples to
the control unit; the Hall element is coupled with the four first
spring members and the electromagnetic driving module, and can
receive a control signal from the control unit in order to control
and adjust a current provided by the Hall element to the
electromagnetic driving module;
[0020] wherein the first spring plate is in the form of hollowed
out thin metal plate; in addition, each one of the first spring
members of first spring plate comprises: a first outer rim
connected to the movable frame, a first inner rim connected to the
lens holder, at least one first inner string extending and
connecting between the first outer rim and the first inner rim, and
a first contact located at the first outer rim; each one of the
suspension wires has its one end thereof being correspondingly
connected to one of the first contacts;
[0021] wherein the electromagnetic lens driving device further
comprises a second circuit board; the Hall element is furnished on
the second circuit board; a sensing magnet for Z-axis position is
furnished on the lens holder at a location corresponding to the
Hall element; in addition, the end of each suspension wire which is
connected to the first contact is coupled with the second circuit
board, and thus is further coupled to one of the pins of the Hall
element via the second circuit board.
[0022] In a preferred embodiment, the electric coupling structure
further comprises a second spring plate located at a lower side of
the lens holder along the Z-axis direction opposite to the first
spring plate; the second spring plate comprises at least two
individual and separated second spring member; each one of the
second spring members comprises: a second outer rim connected to
the movable frame, a second inner rim fixed on the lens holder for
flexibly retaining a bottom position of the lens holder along the
Z-axis direction, at least one second inner string extending and
connecting between the second outer rim and the second inner rim,
and a second contact located at the second outer rim; wherein the
electromagnetic driving module comprises at least a driving coil
furnished on the lens holder and at least two driving magnets
mounted on the movable frame and corresponding to the driving coil;
wherein the second inner rim of each second spring member is
electric coupled with the driving coil of the electromagnetic
driving module; in addition, the second contact of each second
spring member is coupled to the second circuit board and thus is
further coupled with one of the pins of the Hall element.
[0023] In a preferred embodiment, the second contact of each one of
the second spring members is coupled to the second circuit board by
means of one of the following structures: bending a thin elongated
extending part extended from the second contact toward the second
circuit so as to let an end of the extending part connect to the
second circuit board, and soldering a connecting wire at the second
contact and let an end of the connecting wire connect to the second
circuit board.
[0024] In a preferred embodiment, the first spring plate includes
at least six independent and separated first spring members;
wherein, among these six first spring members, there are four first
spring members that each of these four first spring members
includes the first contact which is coupled with the control unit
by means of the suspension wire; while the other two first spring
members do not connect to the suspension wires and are coupled to
the electromagnetic driving module via the first inner rim:
[0025] wherein the electromagnetic driving module comprises at
least a driving coil furnished on the lens holder and at least two
driving magnets mounted on the movable frame and corresponding to
the driving coil;
[0026] wherein the first inner rim of each one of the other two
first spring members is coupled with the coil of the
electromagnetic driving module; in addition, the first outer rim of
each one of the other two first spring members is coupled to the
second circuit board and is further coupled to one of the pins of
the Hall element in order to supply the current to the
electromagnetic driving module in order to control operations of
the electromagnetic driving module.
[0027] In a preferred embodiment, the OIS module comprises:
[0028] at least a first stabilizing coil furnished on the first
circuit board and coupled to the control unit;
[0029] at least a second stabilizing coil furnished on the first
circuit board and are perpendicular to the first stabilizing coils;
in addition, the second stabilizing coils being coupled to the
control unit;
[0030] at least a first stabilizing magnet mounted on the movable
frame and corresponding to the first stabilizing coil;
[0031] at least a second stabilizing magnet mounted on the movable
frame and corresponding to the second stabilizing coil; and
[0032] at least two position sensors mounted on the first circuit
board and coupled to the control unit; the at least two position
sensors being used to detect the position of the movable frame
relative to the first circuit board along the X-axis direction and
the Y-axis direction;
[0033] wherein, the first and second stabilizing magnets are the
same with the driving magnets of the electromagnetic driving
module.
[0034] All these objects are achieved by the suspension mechanism
for an optical image anti-shake device described below.
BRIEF DESCRIPTION OF THE DRAWINGS
[0035] The present invention will now be specified with reference
to its preferred embodiment illustrated in the drawings, in
which:
[0036] FIG. 1 and is a front-side schematic exploded view of the
tri-axis close-loop feedback controlling module for the
electromagnetic lens driving device according to a first embodiment
of the present invention;
[0037] FIG. 2 is a rear-side schematic exploded view of the
tri-axis close-loop feedback controlling module for the
electromagnetic lens driving device according to a first embodiment
of the present invention;
[0038] FIG. 3 is the front-side schematic exploded view of the
electric coupling structure and the electromagnetic driving module
of the electromagnetic lens driving device according to the first
embodiment of the present invention;
[0039] FIG. 4 is the rear-side schematic exploded view of the
electric coupling structure and the electromagnetic driving module
of the electromagnetic lens driving device according to the first
embodiment of the present invention;
[0040] FIG. 5 is a schematic view of the six pins of the 6-pin Hall
element of the electromagnetic lens driving device of the present
invention;
[0041] FIG. 6 is the perspective assembled view of the detailed
positions of the suspension wires of the electromagnetic lens
driving device according to the present invention's first
embodiment;
[0042] FIG. 7 is the partial cross-sectional view of the detailed
positions of the suspension wires of the electromagnetic lens
driving device according to the present invention's first
embodiment;
[0043] FIG. 8 is the perspective assembled view of the detailed
positions of the second spring plate of the electromagnetic lens
driving, device according to the present invention's first
embodiment;
[0044] FIG. 9 is the p partial cross-sectional view of the detailed
positions of the second spring plate of the electromagnetic lens
driving device according to the present invention's first
embodiment;
[0045] FIG. 10 is a schematic view showing a connecting way of the
second spring plate and the driving coil of the electromagnetic
driving module of the electromagnetic lens driving device according
to the present invention's first embodiment:
[0046] FIGS. 11A and 11B are respectively a 45-degree
cross-sectional view without cross-sectional lines and a 45-degree
cross-sectional view with cross-sectional lines of the first
embodiment of the electromagnetic lens driving device shown in FIG.
1 and FIG. 2;
[0047] FIGS. 12A to 12C are respectively the schematic views of
three different embodiments of the ways to electrically conduct the
driving coil of the electromagnetic driving module of the
electromagnetic lens driving device of the invention;
[0048] FIG. 13A and FIG. 13B are respectively the top view and
schematic perspective view of the embodiment shown in FIG. 12A;
[0049] FIG. 14A and FIG. 14B are respectively the top view and
schematic perspective view of the embodiment shown in FIG. 12B;
[0050] FIG. 15A and FIG. 15B are respectively the top view and
schematic perspective view of the embodiment shown in FIG. 12C;
[0051] FIG. 16 is a schematic exploded view of the first embodiment
of the electromagnetic lens driving device shown in FIG. 1, in
which the first spring plate and the second spring plate are also
exploded;
[0052] FIG. 17 is a schematic perspective view of the tri-axis
close-loop feedback controlling module for the electromagnetic lens
driving device according to a second embodiment of the present
invention;
[0053] FIG. 18 is a schematic perspective view of the tri-axis
close-loop feedback controlling module for the electromagnetic lens
driving device according to a third embodiment of the present
invention; and
[0054] FIG. 19 is a schematic perspective view of the tri-axis
close-loop feedback controlling module for the electromagnetic lens
driving device according to a fourth embodiment of the present
invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0055] The tri-axis close-loop feedback controlling module for
electromagnetic lens driving device according to the present
invention comprises a 6-pins Hall Magnetic Sensing Element (also
referred as 6-pin Hall element hereinafter). Two pins of the 6-pin
Hall element are coupled to an auto-focus module for providing a
current to the auto-focus module in order to drive the auto-focus
module to conduct the auto-focusing operations along the Z-axis;
while other four pins of the 6-pin Hall element are coupled to a
control unit. The control unit can detect the signals generated by
an OIS module to obtain the X-Y axial positions of the auto-focus
module relative to the OIS module, so as to generate a control
signal according to the X-Y axial position of the auto-focus
module, and then send the control signal to the 6-pin Hall element.
Therefore, the 6-pin Hall element not only can provide its own
feedback controlling function according to the Z-axial position of
lens, but also can accept the control signal from the control unit
and then providing the current for driving the auto-focus module
based on the control signal received from the control unit, so as
to achieve the goal of tri-axis close-loop feedback controlling for
the electromagnetic lens driving device.
[0056] Please refer to FIG. 1 FIG. 2, FIG. 11A, FIG. 11B and FIG.
16. In which, FIGS. 1 and 2 are respectively a front-side schematic
exploded view and a rear-side schematic exploded view of the
tri-axis close-loop feedback controlling module for the
electromagnetic lens driving device according to a first embodiment
of the present invention. FIGS. 11A and 11B are respectively a
45-degree cross-sectional view without cross-sectional lines and a
45-degree cross-sectional view with cross-sectional lines of the
first embodiment of the electromagnetic lens driving device shown
in FIG. 1 and FIG. 2. FIG. 16 is a schematic exploded view of the
first embodiment of the electromagnetic lens driving device shown
in FIG. 1, in which the first spring plate and the second spring
plate are also exploded.
[0057] In the first embodiment of the present invention, the
tri-axis close-loop feedback controlling module for the
electromagnetic lens driving device 1 comprises: a lens holder 11,
a moveable frame 12, an electromagnetic driving module 13, an
optical image stabilization (OIS) module 14, a control unit 15, a
Hall element 16 having at least six pins (also referred as 6-pin
Hall element), a first circuit board 17, an electric coupling
structure 18, a second circuit board 19, a casing 20 and a bottom
cover 21.
[0058] The lens holder 11 is for receiving a lens (not shown in
FIGS. 1 and 2) therein. Generally speaking, the lens is screwed
into the threads 111 formed on the inner surface of the central
through hole of the lens holder 11 in a removable manner.
[0059] The movable frame 12 is a hollow frame structure having an
inner compartment for receiving the lens holder 11 in such a manner
that, the lens holder 11 is movable a Z-axis direction relative to
the movable frame 12 along in a limited manner.
[0060] The electromagnetic driving module 13 is furnished between
the movable frame 12 and the lens holder 11 and is for driving the
lens holder 11 together with the lens to move along the Z-axis
relative to the movable frame 12, so as to perform the
auto-focusing and/or zooming operations along the direction of
Z-axis. In this first embodiment, the electromagnetic driving
module 13 comprises at least a driving coil 131 and at least two
driving magnets 132, 133.
[0061] The driving coil 131 is furnished on the lens holder 11 by
means of having the driving coil 131 winding around the outer rim
of the lens holder 11. The at least two driving magnets 132, 133
comprises four magnets which are respectively mounted on four sides
of the movable frame 12 corresponding to the driving coil 131 and
are equally spaced apart from each other. Thereby, when applying a
current to the driving coil 131 of the electromagnetic driving
module 13, a magnetic pushing force along the Z-axis direction will
be generated among the driving coil 131 and these driving magnets
132, 133, such that the lens holder 11 together with the lens
thereinside will be moved by the force along the Z-axis linearly
respective to the movable frame 12, so as to achieve the functions
of auto-focusing and/or zoomming.
[0062] The OIS module 14 is for driving the movable frame 12
together with the lens holder 11 located therein to move
bi-directionally along an X-axis direction and a Y-axis direction,
which usually is for moving the lens holder 11 together with the
lens along the X-Y plane in order to compensate the biased position
of the lens caused by shakings; that is, to perform OIS operations.
Wherein, the X-axis, Y-axis and Z-axis are perpendicular with each
other, while the Z-axis is also the optical path for the lens. In
this first embodiment, the OIS module 14 comprises: at least a
first stabilizing coil 141, at least a second stabilizing coil 142,
at least a first stabilizing magnet 132, at least a second
stabilizing magnet 133, and at least two position sensors 143. The
first stabilizing coils 141 are furnished at two opposite sides of
the first circuit board 17 and are coupled to the control unit 15.
The second stabilizing coils 142 are furnished at the other two
opposite sides of the first circuit board 17 and are perpendicular
to the first stabilizing coils 141; in addition, the second
stabilizing coils 142 are coupled to the control unit 15. In the
present embodiment, the amount of both the first stabilizing coils
141 and the second stabilizing coils 142 is both three. The first
stabilizing magnets 132 are mounted on the movable frame 12 and are
corresponding to the first stabilizing coils 141, respectively. In
the mean time, the second stabilizing magnets 133 are mounted on
the movable frame 12 and are corresponding to the second
stabilizing coils 142, respectively. In this first embodiment, the
amount of both the first and second stabilizing magnets 132, 133 is
two. In addition, the first and second stabilizing magnets 132, 133
are actually the same with the four driving magnets 132, 133 of the
electromagnetic driving module 13: that means, the four magnets
132, 133 not only are used as the driving magnets in the
electromagnetic driving module 13, but also are used as the
stabilizing magnets in the OIS module 14 in the same time. However,
in another embodiment not shown in figures, these driving magnets
and stabilizing magnets can also be different magnets mounted on
the same movable frame. The two position sensors 143 are mounted on
the first circuit board 17 and are coupled to the control unit. The
locations of these two position sensors 143 are respectively
corresponding to and also near to the first stabilizing magnet 132
and the second stabilizing magnet 133. Such that, these two
position sensors 143 can be used to detect the variations of the
magnetic strength of the first stabilizing magnet 132 and the
second stabilizing magnet 133, respectively, so as to detect and
calculate the position or biased position of the movable frame 12
relative to the first circuit board 17 along the X-axis direction
and the Y-axis direction. In this embodiment, the at least two
position sensors 143 can also be Hall elements, but not necessarily
be the 6-pin Hall element. These position sensors 143 can also be
Hall elements with only four pins or other kinds of magnetic force
detecting sensors.
[0063] The control unit 15 is furnished on the first circuit board
17 and is coupled with the stabilizing coils 141, 142 of the OIS
module 14 and those position sensors 143. The control unit 15 can
detect and control the operations of the OIS module 14, and can
generate a control signal corresponding to the OIS operations of
the OIS module 14. In other words, the control unit 15 can receive
the output signals of the two position sensors 143 and then
calculate the position or biased position of the movable frame 12
(together with the lens holder 11 and lens located therein)
relative to the first circuit board 17 along the X-axis direction
and the Y-axis direction; and then, the control unit 15 not only
can generate control signals and electric currents to those
stabilizing coils 141, 142 for driving the OIS module 14 to
compensate the biased positions of the lens along the X-axis and
Y-axis directions (that is, the OIS operations), but the control
unit 15 also can generate a control signal based on the calculated
position or biased position of the movable frame 12 relative to the
first circuit board 17 along the X-axis direction and the Y-axis
direction, and then send the control signal to the 6-pin Hall
element 16.
[0064] In the present invention, the 6-pin Hall element 16 has six
contact pins, in which, two pins are coupled to the electromagnetic
driving module 13 for providing an electric current to the
electromagnetic driving module 13 and also controlling the
operations of the electromagnetic driving module 13, while the
other four pins are coupled to the control unit 15 for receiving
the control signals generated by the control unit 15. Such that,
the 6-pin Hall element 16 can control the current providing to the
electromagnetic driving module 13 according to the control signals
generated by the control unit 15. That means, the control unit 15
not only can control the OIS module 14 to conduct the
bi-directional OIS operations along the X-and-Y axes, but also can
detect and receive the control signals of the OIS module 14 in
order to calculate the current X-and-Y axial position (or biased
position) of the movable frame 12 relative to the OIS module 14 (or
first circuit board 17), so as to generate a control signal based
on the calculated position (or biased position) of the movable
frame 12 relative to the first circuit board 17 along the X-axis
direction and the Y-axis direction, and then send the control
signal to the 6-pin Hall element 16. Therefore, the 6-pin Hall
element 16 not only can provide its own feedback control function
for the Z-axial positions of the lens holder 11, but also can
accept the control signal generated by the control unit 15 in order
to obtain the current X-and-Y axial position (or biased position)
of the movable frame 12; such that the 6-pin Hall element 16 can
adjust the electric current providing to the electromagnetic
driving module 13 according to the accepted control signal, so as
to control the Z-axial auto-focusing operations of the
electromagnetic driving module 13 of the auto-focus module. As a
result, the feature of X-Y-Z tri-axis close-loop feedback
controlling for electromagnetic lens driving device 1 is achieved.
In the first embodiment, the 6-pin Hall element 16 can be the Hall
element produced by Asahi. Kasei Microdevices Corp. with the Model
No. AKM 7345 that can be purchased from the market, or can also be
other kinds of Hall element with six pins available in the art, so
as to provide to functions of acting as the position sensor along
Z-axis direction and controlling and providing the driving current
to the driving coils based on the control signal which in turn is
corresponding to the X-and-Y axial positions of the movable
frame.
[0065] In the first embodiment, the first circuit board 17 is a
flexible printed circuit (FPC) board. The first circuit board 17
not only is furnished with the control unit 15, the stabilizing
coils 141, 142 of the OIS module 14 and the position sensors 143,
but also has a flat cable 171 extending out of the casing 20 of the
electromagnetic lens driving device 1 for connecting to a
connecting cable or a connecting socket (not shown in figures). In
the present invention, the first circuit board 17 is connected on
the bottom cover 21 and is a fixed member as the casing 20. To
describe in a relative manner, the movable frame 12 is a movable
member that can move relative to the first circuit board 17
bi-directionally along the X-axis and the Y-axis, while the lens
holder 11 together with the lens therein is another movable member
that can move relative to the movable frame 12 along the Z-axis
direction.
[0066] Please refer to FIG. 3 and FIG. 4, which respectively are
the front-side and rear-side schematic exploded views of the
electric coupling structure 18 and the electromagnetic driving
module 13 of the electromagnetic lens driving device according to
the first embodiment of the present invention. In the present
invention, the 6-pin Hall element 16 is coupled with the
electromagnetic driving module 13 and the control unit 15 by means
of the electric coupling structure 18. In this first embodiment,
the electric coupling structure 18 comprises a first spring plate
181 (also referred as the upper spring plate), a second spring
plate 181 (also referred as the lower spring plate), and at least
four suspension wires 183. The first spring, plate 181 is located
at an upper side of the lens holder 11 along the Z-axis direction,
and comprises four individual and separated first spring member
1811. Each one of the first spring members 1811 comprises a first
inner rim 1812 for flexibly retaining a top position of the lens
holder 11 along the Z-axis direction and a first contact 1813 which
is connected with one suspension wire 183. Each one of the
suspension wires 183 extends from the first spring members 1811
toward the first circuit board 17 and couples to the control unit
15. The 6-pin Hall element 16 is coupled with the four first spring
members 1811 of the first spring plate 181 and the electromagnetic
driving module 13, and can receive a control signal from the
control unit 15 in order to control and adjust the electric current
provided by the 6-pin Hall element 16 to the electromagnetic
driving module 13. As shown in FIG. 3 and FIG. 4, both the first
spring plate 181 and the second spring plate 182 are in the form of
hollowed out thin metal plate. Wherein, each one of the first
spring members 1811 of first spring plate 181 comprises: a first
outer rim 1814 connected to the movable frame 12, a first inner rim
1812 connected to the lens holder 11, at least one first inner
string 1815 extending and connecting between the first outer rim
1814 and the first inner rim 1812, and a first contact 1813 located
at the first outer rim 1814. Each one of the suspension wires 183
has its one end thereof being correspondingly connected and
soldered to one of the first contacts 1813.
[0067] The second spring plate 182 is located at a lower side of
the lens holder 11 along the Z-axis direction opposite to the first
spring plate 181, and comprises at least two individual and
separated second spring member 1821. Each one of the second spring
members 1821 comprises: a second outer rim 1822 connected to the
movable frame 12, a second inner rim 1823 for flexibly retaining a
bottom position of the lens holder 11 along the Z-axis direction,
at least one second inner string 1824 extending and connecting
between the second outer rim 1822 and the second inner rim 1823,
and a second contact (not shown in FIGS. 3 and 4) located at the
second outer rim 1822. Each one of the suspension wires 183 has its
one end thereof being correspondingly connected and soldered to one
of the first contacts 1813. Wherein, each one of the second inner
rims 1823 of the second spring members 1821 is coupled with the
driving coil 131 of the electromagnetic driving module 13, while
the second contact of the second spring member 1821 is electrically
coupled to the second circuit board 19 and then further coupled
with one of the six pins of the 6-pin Hall element 16.
[0068] It is worth to mention that, as shown in. FIG. 3 and FIG. 4,
although there are a plurality of first connecting parts 1816 being
formed between the first spring members 181 while a plurality of
second connecting parts 1825 are further formed between the second
spring members 182; however, the function and purpose of these
first and second connecting parts 1816, 1825 are merely for
convenient production and assembly only. Once the first spring
plate 181 and the second spring plate 182 are assembled onto the
electromagnetic lens driving device 1, these first and second
connecting parts 1816, 1825 will be broken, separated and
discarded, and no longer belong to the components of the
electromagnetic lens driving device 1 of the invention. After then,
those first spring members 1811 will be separated from each other
and become individual members, while those second spring members
1821 will also be separated from each other and also become
individual members.
[0069] In the present invention, the outer rim of the second
circuit board 19 and the outer rim of the first spring plate 181
are both fixed to a top surface of the movable frame 12, and thus
are movable together with the movable frame 12 horizontally. The
6-pin Hall element 16 if mounted on a bent part 191 of the second
circuit board 19; and in addition, a sensing magnet 112 for Z-axis
position is furnished on the lens holder 11 at a location
corresponding to and nearby the 6-pin Hall element 16. Moreover,
the end of each one of the suspension wires 183 that is soldered to
the first contact 1813 is also coupled to the second circuit hoard
19, and thus is further coupled to one of the pins of the 6-pin
Hall element 16 by means of the second circuit board 19. The other
end of each one of the suspension wires 183 is connected to the
first circuit board 17 and is further coupled with the control unit
15.
[0070] Please refer to FIG. 5 which is a schematic view of the six
pins of the 6-pin Hall element of the electromagnetic lens driving
device of the present invention. Taking the example of the 6-pin
Hall element of Model No. AKM 7345 produced by Asahi Kasei
Microdevices Corp., its six pins 161 can be numbered as A1, A2, B1,
B2, C1 and C2, respectively, and the feature of each pin is shown
in the following Table One.
TABLE-US-00001 TABLE One descriptions of pins of AKM 7345 Hall
element Pin No. Name Type I/O Description Notes A1 VDD PWR -- Input
Power pin Power Supply B1 SDA D I/O Data Digital pin C1 OUT1 A O
Driver Analog pin output 1 C2 OUT2 A O Driver Analog pin output 2
B2 SCL D I Clock Digital pin A2 VSS GND -- Ground Ground pin
[0071] Wherein, pin A1 is VDD (pin for input power) whose function
is to input power supply of 2.65V.about.3.6V (Volt) for driving the
6-pin Hall element 16. Pin A2 is VSS whose function is ground. Pin
B1 is SDA whose function is to input and output digital data
signals. Pin B1 is SCL whose function is to input clock signals.
Pins C1 and C2 are for outputting driving current of 79 mA-142 mA
(120 mA preferred) to the driving coil 131 of electromagnetic
driving module 13 in order to perform the auto-focusing and/or
zooming operations.
[0072] Please refer to FIG. 6 and FIG. 7, which respectively are
the perspective assembled view and the partial cross-sectional view
of the detailed positions of the suspension wires 183 of the
electromagnetic lens driving device 1 according to the present
invention's first embodiment. As shown in FIG. 6 and FIG. 7, in the
first embodiment of the invention, each one of the suspension wire
183 has its one end (upper end) connects to a corresponding first
contact 1813 of the first spring member 1811, and couples to the
second circuit board 19 via the first spring, member 1811, and thus
further couples to one of the pins A1, A2, and B2 of the 6-pin Hall
element 16 furnished on the second circuit board 19. Another end
(lower end) of each one of the suspension wire 183 is connected to
one of the four corners of the bottom cover 21 and is electric
coupled to the control 15 furnished on the first circuit board 17.
Because the lower end of each suspension wire 183 is fixed to the
bottom cover 21 which is a fixed component, and the upper end of
each suspension wire 183 is fixed to the first contact 1813 of the
first outer rim 1814 of the first spring member 1811, and the first
outer rim 1814 of each first spring member 1811 is connected to the
movable frame 12, and the first inner rim 1812 of each first spring
member 1811 is connected to the lens holder 22; therefore, these
suspension wires 183 substantially lift and suspend the movable
frame 13 together with the lens holder 11 above the first circuit
board 17. Such that, the movable frame 12 can only hi-directionally
move relative to the first circuit board 17 along the X-axis and
the Y-axis in a restricted manner, but almost cannot move along the
Z-axis direction.
[0073] In the present invention, the second contact of each one of
the second spring members 1821 is coupled to the second circuit
board 19 by means of one of the following structure: bending a thin
elongated extending part extended from the second contact toward
the second circuit so as to let the upper end of the extending part
connect to the second circuit board 19, or soldering a connecting
wire at the second contact and let the upper end of the connecting
wire connect to the second circuit board 19. These structures will
be described in detail below.
[0074] Please refer to FIG. 8 and FIG. 9, which respectively are
the perspective assembled view and the partial cross-sectional view
of the detailed positions of the second spring plate 182 of the
electromagnetic lens driving device 1 according to the present
invention's first embodiment. As shown in FIG. 8 and FIG. 9, in the
first embodiment of the invention, the second spring plate 182
comprises two independent and separated second spring members 1821.
Each one of the second spring members 1821 includes a thin
elongated extending, part 1827 which is extended from the second
contact 1826 and id bent toward the second circuit board 19 in such
a manner that, the upper end of the extending part 1827 is
contacted and soldered with the second circuit board 19, and thus
further coupled to one of the pins C1 and C2 of the 6-pin Hall
element 16.
[0075] As shown in FIG. 10 which is a schematic view showing a
connecting way of the second spring plate 182 and the driving coil
131 of the electromagnetic driving module 13 of the electromagnetic
lens driving device 1 according to the present invention's first
embodiment. The second spring plate 182 comprises two independent
and separated second spring members 1821. Each one of the second
spring members 1821 includes a soldering point 1828 at its second
inner rim 1823. Each one of the two soldering point 1828 is
soldered with an end of the wire 1311 of the driving coil 131 of
the electromagnetic driving module 13. That means, the second inner
rim 1823 of each second spring member 1821 is electric coupled with
the driving coil 131 of the electromagnetic driving module 13 by
means of the wire 1311 soldered at its soldering point 1828. In
addition, the second contact 1826 of each second spring member 1821
is coupled to the second circuit board 19 via the extending part
1827, and thus is further coupled with one of the pins C1 and C2 of
the 6-pin Hall element 16. Thereby, the analog current signals
output from the pins C1 and C2 of the 6-pin Hall element 16 can be
used to drive the driving coil 13 of the electromagnetic driving
module 13 in order to let the lens holder 11 move relative to the
movable frame 12 for performing the auto-focusing and/or zooming
operations along the Z-axis direction.
[0076] In the present invention, there are several ways to
electrically conduct the driving coil of the electromagnetic
driving module. For example, FIGS. 12A to 12C are respectively the
schematic views of three different embodiments of the ways to
electrically conduct the driving coil of the electromagnetic
driving module of the electromagnetic lens driving device of the
invention. In addition, FIG. 13A and FIG. 13B are respectively the
top view and schematic perspective view of the embodiment shown in
FIG. 12A. FIG. 14A and FIG. 14B are respectively the top view and
schematic perspective view of the embodiment shown in FIG. 12B.
FIG. 15A and FIG. 15B are respectively the top view and schematic
perspective view of the embodiment shown in FIG. 12C.
[0077] Please refer to FIG. 12A, FIG. 13A and FIG. 13B, which
illustrate an embodiment of the way to electrically conduct the
driving coil of the electromagnetic driving module of the first
embodiment as shown in FIGS. 8-10. That is, the second spring plate
182a includes four independent and separated second spring members
1821a. Among them, there are two of the second spring members 1821a
that, each one of these two second spring members 1821a includes a
soldering point 1828a at its second inner rim 1823a. Each one of
the two soldering point 1828a is soldered with an end of the wire
1311 of the driving coil 131 of the electromagnetic driving module
13. That means, the second inner rim 1823a of each of these two
second spring member 1821a is electric coupled with the driving
coil 131 of the electromagnetic driving module 13 by means of the
wire 1311 soldered at its soldering point 1828a. In addition, the
second contact 1826a of each of these two second spring members
1821a is coupled to the second circuit board 19 via an extending
part 1827a extending from the second contact 1826a toward the
second circuit board 19, and thus is further coupled with one of
the pins C1 and C2 of the 6-pin Hall element 16. In addition,
similar to the electromagnetic driving module 13 of the first
embodiment shown in FIGS. 8-10, the first spring plate 181a shown
in FIG. 12A, FIG. 13A and FIG. 13B also includes at least four
first spring members 1811a. Each one of these four first spring
members 1811a includes a first inner rim 1812a for flexibly
retaining a top position of the lens holder 11 along the Z-axis
direction and a first contact 1813a which is connected with one
suspension wire 183. Each one of the suspension wires 183 extends
from the first spring members 1811a toward the first circuit board
17 and couples to the control unit 15. The first outer rim 1814a of
each one of these four first spring members 1811a is coupled to the
second circuit board 19 and then is further coupled to one of the
pins A1, A2, B1 and B2 of the 6-pin. Hall element 16 respectively.
Thereby, the four pins A1, A2. B1 and B2 of the 6-pin Hall element
16 are coupled to the control unit 15 by means of the four first
spring members of the first spring plate and the four suspension
wires, while the other two pins C1 and C2 of the 6-pin Hall element
16 are coupled to the driving coil 131 of the electromagnetic
driving module 13 by means of the bent extending parts 1827a and
the second inner rims 1823a of the two second spring members 1821a
and the second circuit board 19. By means of such novel electric
coupling structure, the control 15 can detect the signals of the
OIS module 14 to obtain the X-and-Y axial positions of the movable
frame 12 relative to the first circuit board 17, and then generates
a control signal according to the X-and-Y axial positions of the
movable frame 12, and then sends this control signal to the 6-pin.
Hall element 16. Therefore, the 6-pin Hall element 16 not only can
provide its own feedback controlling function according to the
Z-axial position of lens, but also can accept the control signal
from the control unit 15 and then providing the current for driving
the auto-focus module 13 based on the control signal received from
the control unit 15, so as to achieve the goal of tri-axis
close-loop feedback controlling for the electromagnetic driving
module 13.
[0078] Please refer to the embodiment shown in FIG. 12B, FIG. 14A
and FIG. 14B, wherein, the second spring plate 182b also includes
two or four independent and separated second spring members 1821b.
In which, the second inner rim 1823b of each one of two of the
second spring members 1821b is formed with a soldering point 828b.
Each soldering point 1828b is soldered with one end of the wires
1311 of the driving coil 131 of the electromagnetic driving module
13. However, the second contact 1826b of each one of two of the
second spring members 1821b is soldered with a lower end of a
connecting wire 184. The other end (upper end) of each connecting
wire 184 is connected to the second circuit board 19, and is
further coupled to one of the pins C1 and C2 of the 6-pin Hall
element 16. Since the electrical conduction method between the pins
A1, A2, B1 and B2 of the 6-pin Hall element 16 and the control unit
15 is exactly the same as the embodiment previously illustrated in
FIG. 12A, FIG. 13A and FIG. 13B, and thus will not be described in
detailed here.
[0079] Please refer to the embodiment shown in FIG. 12C, FIG. 14A
and FIG. 1413, which does not rely on the second spring plate to
electric conduct the driving coil of the electromagnetic driving
module. In contrast, as shown in FIG. 12C, the first spring plate
181c includes at least six independent and separated first spring
members 1811c, 1811c'. Among these six first spring members 1811c,
1811c', there are four first spring members 1811c that each of
these four first spring members 1811c includes the first contact
1813c which is coupled with the control unit 15 by means of the
suspension wire 183 connected to the first contact 1813c. The other
two first spring members 1811c' do not connect to the suspension
wires 183, in addition, each one of these two first spring members
1811c' includes a soldering point 1817 located on the first inner
rim 1812c'. The soldering point 1817 of each one of these two first
spring members 1811c' is soldered with one end of the wires 1311 of
the driving coil 131, and thus is coupled with the electromagnetic
driving module 13. Wherein, the first inner rims 1812c' of the two
first spring members 1811c' are coupled with two ends of the
driving coil 131 of the electromagnetic driving module 13, in the
mean time, either the first contact or the first outer rim 1814c of
each one of the two first spring members 1811c' is coupled to the
second circuit board 19 and is further coupled to one of the pins
C1 and C2 of the 6-pin Hall element 16, so as to provide a current
to the electromagnetic driving module 13 for controlling its
operations. Since the electrical conduction method between the pins
A1, A2, B1 and B2 of the 6-pin Hall element 16 and the control unit
15 is exactly the same as the embodiment previously illustrated in
FIG. 12A, FIG. 13A and FIG. 13B, and thus will not be described in
detailed here.
[0080] The other embodiments of the present invention described
below generally comprise the same or similar components, structures
and features as the first embodiment illustrated above, and thus
the same numerals and names will be assigned to the same or similar
components, only that an additional alphabet will be added after
the numeral for distinguishing the different embodiments, and no
detailed descriptions will be provided for these same or similar
components.
[0081] FIG. 17 is a schematic perspective view of the tri-axis
close-loop feedback controlling module for the electromagnetic lens
driving device according to a second embodiment of the present
invention. According to this second embodiment, the electromagnetic
lens driving device 1a comprises: a lens holder 11a, a moveable
frame 12a, an electromagnetic driving module 13a, an OIS module
14a, a control unit 15a, a 6-pin Hall element 16, a first circuit
board 17a, an electric coupling structure 18a, a second circuit
board 19a, a casing 20a, a bottom cover 21a and a top cover 22.
Wherein, the lens holder 11a, moveable frame 12a, electromagnetic
driving module 13a, OIS module 14a, control unit 15a, 6-pin Hall
element 16, first circuit board 17a, second circuit board 19a,
casing 20a and bottom cover 21a have similar structures and
features of which previously illustrated in the first embodiment
shown in FIG. 1 and FIG. 16, and thus no detailed descriptions will
be provided for these similar components. The differences between
the electromagnetic lens driving device 1a of this second
embodiment and the first embodiment are described below.
[0082] The top cover 22 is located between the casing 20a and the
second circuit board 19a, and can clamp and fix the second circuit
board 19a and the first outer rim 1814a of each first spring member
1811a of the first spring plate 181a to the protrusions 121 formed
on the upper surface of the movable frame 12a. In the mean time,
the top cover 22 can also prevent the lens holder 11a from dropping
out of the movable frame 12a when moving along the Z-axis
direction.
[0083] The electric coupling structure 18a of this second
embodiment shown in FIG. 17 also comprises a first spring plate
181a (also referred as upper spring plate), a second spring plate
182a (also referred as lower spring plate) and four suspension
wires 183. However, in this second embodiment, the second spring
plate 182a comprises four independent and separated second spring
members 1821a, 1821a'. Wherein, two of the second spring members
1821a are formed with a thin elongated extending part 1827a
extending from the second contact 1826a and a soldering point 1828a
located at the second inner rim 1823a. The extending part 1827a is
bent toward the second circuit board 19 such that the end of the
extending part 1827a can connect to the second circuit board 19.
The soldering points 1828a are soldered with two ends of the wires
of the driving coil 131 of the electromagnetic driving module 13.
The other two second spring members 1821a' of the second spring
plate 182a do not have the extending parts nor the soldering
points. The electric coupling structure 18a of this second
embodiment shown in FIG. 17 is corresponding to the embodiment
shown in FIG. 12A. FIG. 13A and FIG. 13B.
[0084] FIG. 18 is a schematic perspective view of the tri-axis
close-loop feedback controlling module for the electromagnetic lens
driving device 1b according to a third embodiment of the present
invention. According to this third embodiment, the electromagnetic
lens driving device 1b comprises: a lens holder 11b, a moveable
frame 12b, an electromagnetic driving module 13b, an OIS module
14b, a control unit 15b, a 6-pin Hall element 16, a first circuit
board 17b, an electric coupling structure 18h a second circuit
board 19b, a casing 20b, a bottom cover 21b and a top cover 22b.
Wherein, the lens holder lib, moveable frame 12b, electromagnetic
driving module 13b, OIS module 14b, control unit 15b, 6-pin Hall
element 16, first circuit board 17b, second circuit board 19b,
casing 20b, bottom cover 21b and top cover 22b have similar
structures and features of which previously illustrated in the
second embodiment shown in FIG. 17, and thus no detailed
descriptions will be provided for these similar components. The
differences between the electromagnetic lens driving device 1b of
this third embodiment and the second embodiment are described
below.
[0085] According to the electromagnetic lens driving device 1b of
this third embodiment shown in FIG. 18, although the second spring
plate 182b comprises four independent and separated second spring
members 1821b, 1821b', however, two of the second spring members
1821b are formed with the soldering points 1828b on their second
inner rims 1823b, but there is no extending part being formed on
the second spring members 1821b. In contrast, two connecting wires
184 are connected between the second outer rims 1822b of the two
second spring members 1821b having the soldering points 1828b and
the second circuit board 19. Each soldering point 1828h is soldered
with an end of the wires of the driving coil 131 of the
electromagnetic driving module 13b. The other two spring members
1821b' do not have any connecting wire nor soldering point. The
electric coupling structure 18b of this third embodiment shown in
FIG. 18 is corresponding to the embodiment shown in FIG. 12B, FIG.
14A and FIG. 14B.
[0086] FIG. 19 is a schematic perspective view of the tri-axis
close-loop feedback controlling module for the electromagnetic lens
driving device 1c according to a fourth embodiment of the present
invention. According to this fourth embodiment, the electromagnetic
lens driving device 1c comprises: a lens holder 11c, a moveable
frame 12c, an electromagnetic driving module 13c, an OIS module
14c, a control unit 15c, a 6-pin Hall element 16, a first circuit
board 17c, an electric coupling structure 18c a second circuit
board 19c, a casing 20c, a bottom cover 21c and a top cover 22c.
Wherein, the lens holder 11c, moveable frame 12c, electromagnetic
driving module 13c, OIS module 14c, control unit 15c, 6-pin Hall
element 16, first circuit board 17c, second circuit board 19c,
casing 20c, bottom cover 21c and top cover 22c have similar
structures and features of which previously illustrated in the
second embodiment shown in FIG. 17, and thus no detailed
descriptions will be provided for these similar components. The
differences between the electromagnetic lens driving device 1c of
this fourth embodiment and the second embodiment are described
below.
[0087] According to the electromagnetic lens driving device 1c of
this fourth embodiment shown in FIG. 19, the electric coupling
structure 18c does not rely on the second spring plate 182c to
electric conduct the driving coil 131 of the electromagnetic
driving module 13c. In contrast, as shown in FIG. 19, the first
spring plate 181c includes at least six independent and separated
first spring members 1811c, 1811c'. Among these six first spring
members 1811c, 1811c, there are four first spring members 1811c
that each of these four first spring members 1811c includes the
first contact 1813c which is coupled with the control unit 15 by
means of the suspension wire 183. The other two first spring
members 1811c' do not connect to the suspension wires 183, in
addition, each one of these two first spring members 1811c'
includes a soldering point 1817 located on the first inner rim
1812c'. The soldering point 1817 of each one of these two first
spring members 1811c' is soldered with one end of the wires of the
driving coil 131, and thus is coupled with the electromagnetic
driving module 13. The electric coupling structure 18c of this
fourth embodiment shown in FIG. 19 is corresponding to the
embodiment shown in FIG. 12C, FIG. 15A and FIG. 15B.
[0088] To sum up, the tri-axis close-loop feedback controlling
module for electromagnetic lens driving device of the invention
utilizes a 6-pin Hall element in the second circuit board fixed to
the movable frame (lens module). The movable frame is suspended
above a substrate (first circuit board). The movable frame is
furnished with a lens holder for holding a lens therein which is
movable along the X-axis direction. The lens holder is flexibly
suspended within an inner compartment of the movable frame by means
of an upper spring plate and a lower spring plate fixed on two ends
of the lens holder. The rim of the movable frame is mounted with at
least one driving magnet. The outer rim of the lens holder is wound
with a driving coil corresponding to the driving magnet. By driving
the driving coil to move the lens holder together with the lens
thereinside along the Z-axis (optical path), the functions of
auto-focusing and/or zooming are achieved. In an embodiment of the
novel electric coupling structure of the invention, two ends of the
driving coil are coupled to the two pins (C1, C2) of the Hall
element by means of the two upward bent conduct ends of the lower
spring plate. In the mean time, by electric connecting the four
contacts of the upper spring plate with the other four pins (A1,
A2, B1, B2) of the Hall element, and using the four suspension
wires (located at the four corners of the upper spring plate) of a
suspension mechanism to electrically connecting the other four pins
with the substrate (first circuit board). By means of such novel
electric coupling structure, the electromagnetic lens driving
device can utilize the 6-pin Hall element to detect the X-and-Y
axial positions of the movable frame relative to the substrate
(first circuit board), and uses the control unit located on the
substrate (first circuit board) to calculate, and then adjusts the
biased auto-focusing and/or zooming point of the lens along the
Z-axis direction by coupling the two pins (C1, C2) of the Hall
element to the driving coil. Therefore, the goal of tri-axis
close-loop feedback controlling for the auto-focusing module and
the OIS module can be achieved.
[0089] While the present invention has been particularly shown and
described with reference to a preferred embodiment, it will be
understood by those skilled in the art that various changes in form
and detail may be without departing from the spirit and scope of
the present invention.
* * * * *