U.S. patent application number 09/682085 was filed with the patent office on 2002-04-04 for single stage microactuator for multi-dimensional actuation.
Invention is credited to Choi, Jae-Joon, Jeon, Jong Up, Jeong, Hee-Moon.
Application Number | 20020038984 09/682085 |
Document ID | / |
Family ID | 19678435 |
Filed Date | 2002-04-04 |
United States Patent
Application |
20020038984 |
Kind Code |
A1 |
Jeong, Hee-Moon ; et
al. |
April 4, 2002 |
Single stage microactuator for multi-dimensional actuation
Abstract
A single-stage microactuator is provided. The single-stage
microactuator includes: a substrate; a fixed plate electrode
disposed at a central portion of the substrate; a rectangular stage
having first and second side directions, which is located above the
fixed plate electrode, the second direction being perpendicular to
the first direction; a plurality of actuating frame parts provided
corresponding to the two first direction of sides and the two
second direction of sides for regions surrounding the stage,
wherein each actuating frame includes a plurality of actuating
frames arranged parallel to a corresponding side of the stage
adjacent to each surrounding region; a plurality of comb normal
directional deformable spring parts, each disposed between each
side of the stage and the inner part of each actuating frame part,
wherein each comb normal directional deformable spring part
includes a plurality of spring members extending in a direction
perpendicular to a corresponding side of the stage; a plurality of
fixed frame parts, each including a plurality of fixed frames
alternately arranged parallel to the plurality of actuating frames
of a corresponding actuating frame part of each surrounding region;
an actuating comb electrode provided in each actuating frame of the
actuating frame part, the actuating comb electrode extending in a
direction perpendicular to the side of the stage corresponding to
each surrounding region; a fixed comb electrode arranged
alternately in parallel to the actuating comb electrode in each
fixed frame of the fixed frame part; and a plurality of comb
directional deformable spring parts disposed on one side of each
actuating frame part opposite the stage and the opposing side
thereof for providing an elastic recovery force in a direction
perpendicular to one side of the stage corresponding to each of the
surrounding regions. The microactuator is capable of
multi-dimensional actuation using a single electrode in an
actuating part and of simplifying a fabrication process without an
isolation process step.
Inventors: |
Jeong, Hee-Moon;
(Yongin-city, KR) ; Jeon, Jong Up; (Yongin-city,
KR) ; Choi, Jae-Joon; (Yongin-city, KR) |
Correspondence
Address: |
BURNS DOANE SWECKER & MATHIS L L P
POST OFFICE BOX 1404
ALEXANDRIA
VA
22313-1404
US
|
Family ID: |
19678435 |
Appl. No.: |
09/682085 |
Filed: |
July 18, 2001 |
Current U.S.
Class: |
310/309 |
Current CPC
Class: |
B82Y 10/00 20130101;
H02N 1/008 20130101; G11B 9/1418 20130101 |
Class at
Publication: |
310/309 |
International
Class: |
H02N 001/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 18, 2000 |
KR |
2000-40985 |
Claims
1] A single-stage microactuator comprising: a substrate; a fixed
plate electrode disposed at a central portion of the substrate; a
rectalinear stage having first and second side directions, said
rectalinear being located above the fixed plate electrode, the
second direction being perpendicular to the first direction a
plurality of actuating frame parts provided corresponding to the
two first direction of sides and the two second direction of sides
in regions surrounding the stage, wherein each actuating frame
includes a plurality of actuating frames arranged parallel to a
corresponding side of the stage adjacent to each surrounding
region; a plurality of comb normal directional deformable spring
parts, each disposed between each side of the stage and the inner
part of each actuating frame part, wherein each comb normal
directional deformable spring part includes a plurality of spring
members extending in a direction perpendicular to a corresponding
side of the stage, a plurality of fixed frame parts, each including
a plurality of fixed frames alternately arranged parallel to the
plurality of actuating frames of a corresponding actuating frame
part of each surrounding region; an actuating comb electrode
provided in each actuating frame of the actuating frame part, the
actuating comb electrode extending in a direction perpendicular to
the side of the stage corresponding to each surrounding region, a
fixed comb electrode arranged alternately in parallel to the
actuating comb electrode in each fixed frame of the fixed frame
part; and a plurality of comb directional deformable spring parts
disposed on one side of each actuating frame part opposite the
stage and the opposing side thereof for providing an elastic
recovery force in a direction perpendicular to one side of the
stage corresponding to each of the surrounding regions.
2] The single-stage microactuator of claim 1, wherein the actuating
frame of each actuating frame part comprises: a first actuating
main frame arranged parallel to an adjacent side of the stage; a
plurality of actuating sub-frames arranged outwardly from the stage
and spaced from and parallel to the first actuating main frame; and
a plurality of second actuating main frame extending outward from
the stage and connecting the first actuating main frame to the
plurality of actuating sub-frames.
3] The single-stage microactuator of claim 1, wherein the fixed
frame of each fixed frame part comprises: a plurality of fixed
sub-frames arranged parallel to the first actuating main frame and
the plurality of actuating sub-frames; and a plurality of fixed
main frames for fixing the fixed sub-frame for each region.
4] The single-stage microactuator of claim 2, wherein an area
surrounding the stage is partitioned into the surrounding regions
by boundary lines extending from the stage in a diagonal direction
of the stage, and wherein corresponding actuating and fixed frame
parts are arranged in a form corresponding to each surrounding
region.
5] The single-stage microactuator of claim 3, wherein an area
surrounding the stage is partitioned into the surrounding regions
by boundary lines extending from the stage in a diagonal direction
of the stage, and wherein corresponding actuating and fixed frame
parts are arranged in a form corresponding to each surrounding
region.
6] The single-stage microactuator of claim 2, wherein the plurality
of second actuating main frames are arranged in a direction
extending radially from the stage.
7] The single-stage microactuator of claim 3, wherein the plurality
of second actuating main frames are arranged in a direction
extending radially from the stage.
8] The single-stage microactuator of claim 3, wherein the plurality
of fixed main frames are arranged in a direction extending radially
from the stage.
9] The single-stage microactuator of claim 4, wherein the plurality
of fixed main frames are arranged in a direction extending radially
from the stage.
10] The single-stage microactuator of claim 6, wherein the
plurality of fixed main frames are arranged in a direction
extending radially from the stage.
11] The single-stage microactuator of claim 1, wherein a fixed
plate electrode pad is disposed at a portion adjacent to an edge of
the substrate; and wherein a line electrode extends in a diagonal
direction of the substrate for connecting the fixed plate electrode
pad with the fixed plate electrode.
12] The single-stage microactuator of claim 3, wherein a fixed
plate electrode pad is disposed at a portion adjacent to an edge of
the substrate; and wherein a line electrode extends in a diagonal
direction of the substrate for connecting the fixed plate electrode
pad with the fixed plate electrode.
13] The single-stage microactuator of claim 6, wherein a fixed
plate electrode pad is disposed at a portion adjacent to an edge of
the substrate; and wherein a line electrode extends in a diagonal
direction of the substate for connecting the fixed plate electrode
pad with the fixed plate electrode.
14] The single-stage microactuator of claim 9, wherein a fixed
plate electrode pad is disposed at a portion adjacent to an edge of
the substrate; and wherein a line electrode extends in a diagonal
direction of the substate for connecting the fixed plate electrode
pad with the fixed plate electrode.
15] The single-stage microactuator of claim 2, wherein an actuating
frame electrode pad and a fixed frame electrode pad are disposed at
outer ends of the second actuating main frame and the fixed main
frame, respectively, for applying voltages to the actuating frame
part and the fixed frame part, respectively.
16] The single-stage microactuator of claim 3, wherein an actuating
frame electrode pad and a fixed frame electrode pad are disposed at
outer ends of the second actuating main frame and the fixed main
frame, respectively, for applying voltages to the actuating frame
part and the fixed frame part, respectively.
17] The single-stage microactuator of claim 6, wherein an actuating
frame electrode pad and a fixed frame electrode pad are disposed at
outer ends of the second actuating main frame and the fixed main
frame, respectively, for applying voltages to the actuating frame
part and the fixed frame part, respectively.
18] The single-stage microactuator of claim 9, wherein an actuating
frame electrode pad and a fixed frame electrode pad are disposed at
outer ends of the second actuating main frame and the fixed main
frame, respectively, for applying voltages to the actuating frame
part and the fixed frame part, respectively.
19] The single-stage microactuator of claim 11, wherein an
actuating frame electrode pad and a fixed frame electrode pad are
disposed at outer ends of the second actuating main frame and the
fixed main frame, respectively, for applying voltages to the
actuating frame part and the fixed frame part, respectively.
20] The single-stage microactuator of claim 15, wherein an
actuating frame electrode pad and a fixed frame electrode pad are
disposed at outer ends of the second actuating main frame and the
fixed main frame, respectively, for applying voltages to the
actuating frame part and the fixed frame part, respectively.
Description
BACKGROUND OF INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a single stage
microactuator for multidimensional actuation, and more
particularly, to an X-Y stage microactuator for use in a data
storage system employing scanning probe microscope (SPM)
techniques.
[0003] 2. Description of the Related Art
[0004] A data storage system using SPM techniques mainly includes a
medium for storage, an actuator for mounting the medium to a stage
and driving it in x and y directions, one or more probes each
having a tip for storing or reading information on or from the
medium, and a signal processor for processing such information
signals. The multiple probes can store or read data at one time,
and to accomplish this, the tip of the probe must approach the
medium. Thus, the probe requires an actuator and a sensor. The
actuator deforms the probe in Z direction so that the probe tip
approaches the medium, and the sensor senses the deformation of the
probe made according to information stored on the medium and reads
the relevant information.
[0005] To achieve stage actuation along two or more axes in the X-Y
plane, the actuator requires at least three electrodes for
unidirectional actuation along one axis and at least five
electrodes for bidirectional actuation along one axis. According to
U.S. Pat. No. 5,536,988, a microactuator requiring a plurality of
electrodes is fabricated from a crystal structure using a thermal
oxidation isolation technique to enable multi-dimensional motion.
This approach address the electrode problem associated with
multi-dimensional actuation, but the process is complicated.
[0006] Unlike this approach, in an article presented by P. F.
Indermuehle at MEMS92, there is a discussion of the use of a single
electrode for two-axis actuation. Although this approach offers a
simple process without an isolation process, the use of a single
electrode in an actuating part for actuation causes interferences
between the two-way actuation. An actuator having the above
structure has problems in that the actuator is structurally
unstable to allow rotational motion with respect to a vertical axis
of an actuating plane such that it cannot be used as an actuator
having a large stage for a storage system, and that it suffers from
loss of a stage area over the total area of the microactuator due
to the length of a spring between the stage and the actuator.
SUMMARY OF INVENTION
[0007] To solve the above problems, it is a first object of the
present invention to provide a single-stage microactuator which is
capable of multi-dimensional actuation with a single electrode in
an actuating part and of simplifying a fabrication process without
an isolation process step.
[0008] It is a second object to provide a single-stage
microactuator capable of effectively preventing the motion of a
stage other than the X-Y plane of motion.
[0009] It is a third object to provide a single-stage microactuator
that maximizes the storage capacity with the expansion of a stage
area due to effective arrangement of structures.
[0010] Accordingly, to achieve the above objects, the present
invention provides a single-stage microactuator including: a
substrate; a fixed plate electrode disposed at a central portion of
the substrate; a rectangular stage having first and second
direction of sides, which is located above the fixed plate
electrode, the second direction being perpendicular to the first
direction; a plurality of actuating frame parts provided
corresponding to the two first direction of sides and the two
second side directions for regions surrounding the stage, wherein
each actuating frame includes a plurality of actuating frames
arranged parallel to a corresponding side of the stage adjacent to
each surrounding region; a plurality of comb normal directional
deformable spring parts, each disposed between each side of the
stage and the inner part of each actuating frame part, wherein each
comb normal directional deformable spring part includes a plurality
of spring members extending in a direction perpendicular to a
corresponding side of the stage; a plurality of fixed frame parts,
each including a plurality of fixed frames alternately arranged
parallel to the plurality of actuating frames of a corresponding
actuating frame part of each surrounding region; an actuating comb
electrode provided in each actuating frame of the actuating frame
part, the actuating comb electrode extending in a direction
perpendicular to the side of the stage corresponding to each
surrounding region; a fixed comb electrode arranged alternately in
parallel to the actuating comb electrode in each fixed frame of the
fixed frame part; and a plurality of comb directional deformable
spring parts disposed on one side of each actuating frame part
opposite the stage and the opposing side thereof for providing an
elastic recovery force in a direction perpendicular to one side of
the stage corresponding to each of the surrounding regions.
[0011] In the single-stage microactuator, the actuating frame of
each actuating frame part includes: a first actuating main frame
arranged parallel to an adjacent side of the stage; a plurality of
actuating sub-frames arranged outwardly from the stage and spaced
from and parallel to the first actuating main frame; and a
plurality of second actuating main frame extending outward from the
stage and connecting the first actuating main frame to the
plurality of actuating sub-frames.
[0012] Preferably, the fixed frame of each fixed frame part
includes a plurality of fixed sub-frames arranged parallel to the
first actuating main frame and the plurality of actuating
sub-frames; and a plurality of fixed main frames for fixing the
fixed sub-frame for each region. Preferably, an area surrounding
the stage is partitioned into the surrounding regions by boundary
lines extending from the stage in a diagonal direction of the
stage, and corresponding actuating and fixed frame parts are
arranged in a form corresponding to each surrounding region. It is
preferable that the plurality of second actuating main frames are
arranged in a direction extending radially from the stage, and the
plurality of fixed main frames are arranged in a direction
extending radially from the stage.
[0013] Furthermore, in the single-stage microactuator, a fixed
plate electrode pad is disposed at a portion adjacent to an edge of
the substrate, and a line electrode extends in a diagonal direction
of the substrate for connecting the fixed plate electrode pad with
the fixed plate electrode. Preferably, an actuating frame electrode
pad and a fixed frame electrode pad are disposed at outer ends of
the second actuating main frame and the fixed main frame,
respectively, for applying voltages to the actuating frame part and
the fixed frame part, respectively.
BRIEF DESCRIPTION OF DRAWINGS
[0014] The above objects and advantages of the present invention
will become more apparent by describing in detail preferred
embodiments thereof with reference to the attached drawings in
which:
[0015] FIG. 1 is a top view of a single-stage microactuator for
multi-dimensional actuation according to an embodiment of the
present invention;
[0016] FIG. 2 is a cross-section taken along line A-A of the
single-stage microactuator of FIG. 1, which shows the relationship
between the stage and the fixed plate electrode;
[0017] FIG. 3A is a perspective view of the comb directional
deformable spring part on the outside of the actuating frame part
in the single-stage microactuator for multi-dimensional actuation
of FIG. 1;
[0018] FIG. 3B is a perspective view of comb directional deformable
spring part on the inside of the actuating frame part in the
single-stage microactuator for multi-dimensional actuation of FIG.
1;
[0019] FIG. 4 is a cross-section taken along line B-B of FIG.
3A;
[0020] FIG. 5 is a top view showing the structure in which a
voltage is applied during operation of a single-stage microactuator
for multi-dimensional actuation according to the present
invention;
[0021] FIG. 6 is a simple model diagram for explaining the
principle of operation of a single-stage microactuator for
multi-dimensional actuation according to the present invention;
[0022] FIG. 7 is a simple model diagram of a single-stage
microactuator for multi-dimensional actuation according to the
present invention deformed during unidirectional actuation; and
[0023] FIG. 8 is a simple model diagram of a single-stage
microactuator for multi-dimensional actuation according to the
present invention deformed during bidirectional actuation.
DETAILED DESCRIPTION
[0024] Referring to FIG. 1, a single-stage microactuator according
to the present invention includes a substrate 11, a fixed frame
part fixedly attached to the substrate 11, and an actuating frame
part corresponding to the fixed frame part, which includes a
central rectangular stage 41, and first and second actuating main
frames 36 and 33 and an actuating sub-frame 34 surrounding the
stage 41. The components of the actuating frame part are spaced
apart at a predetermined height by a vertical fixture 12 disposed
in comb directional deformable spring parts 30 and 30', which will
be described below.
[0025] More specifically, the actuating frame part includes the
rectangular stage 41 having first and second direction of sides,
the second direction being orthogonal to the first direction, the
plurality of first actuating main frames 36 spaced apart from and
arranged parallel to the first and second direction of sides, a
comb normal directional deformable spring 37 disposed between each
of the plurality of first actuating main frames 36 and a
corresponding side of the stage 41, the plurality of spaced
actuating sub-frames 34 arranged radially outward from the stage
41, each being spaced apart from and parallel to each first
actuating main frame 36, and the second actuating main frame 33
extending radially outward from the stage 41 for connecting the
plurality of first actuating main frames 36 corresponding to the
sides of the stage 41 with the plurality of actuating sub-frames
34.
[0026] The fixed frame part includes a plurality of fixed
sub-frames 22 arranged parallel to the plurality of first actuating
main frames 36 and the actuating sub-frame 34 and entirely to the
first direction of sides and the second direction of sides of the
stage 41, and fixed main frames 21 and 24 extending radially and
diagonally outward from the stage 41 for interconnecting the
plurality of fixed sub-frames 22 corresponding to the sides of the
stage 41.
[0027] In the above configuration, an area concentrically
surrounding the stage 41 is divided diagonally into four regions
having a trapezoidal shape, as shown in FIG. 1, to form the
actuating frame part and the fixed frame part conforming to the
shape thereof. Moving toward the edge of the substrate 11, the
actuating sub-frame 34 of the actuating frame part and the fixed
sub-frame 22 of the fixed frame part become longer. In this
embodiment, the actuating sub-frame 34 and a corresponding fixed
sub-frame 22 located along the same line for each surrounding
region are divided into two and three, respectively. Three fixed
main frames 21 and 24 and two second actuating main frame 33 for
radially interconnecting the actuating sub-frames 34 and the fixed
sub-frames, respectively, are provided for each surrounding region
by the fixed and actuating sub-frames 22 and 34 configured to
separate them into three and two, respectively, for each line.
[0028] As in a typical actuator, a plurality of actuating comb
electrodes 35 and a plurality of fixed comb electrodes 23 are
arranged alternately between each of the actuating frames 34 or 36
and a corresponding fixed sub-frame 22. An actuating part electrode
pad 17 is mounted on the fixture 12, a fixed part electrode pad 13
is located at the ends of the fixed main frames 21 and 24, and a
fixed plate electrode 14 is placed under the central stage 41 of
the substrate 11, as shown in FIG. 2. Furthermore, a fixed plate
electrode pad 16 is located on one edge of the substrate 11, and a
line electrode 15 for connecting the fixed plate electrode 14 with
the fixed plate electrode pad 16 is located therebetween. The line
electrode 15 formed in a diagonal direction of the substrate 11
passes between two adjacent two fixed main frames 21.
[0029] The actuating frame part, which is separated a predetermined
height from the substrate 11, is supported at the predetermined
height by the fixtures 12 provided in the comb directional
deformable spring part 30 and 30' for supporting this. FIG. 3A is a
perspective view of the comb directional deformable spring part 30
on the outside of the actuating frame part, and FIG. 3B is a
perspective view of the comb directional deformable spring part 30'
on the inside of the actuating frame part, that is, between the
stage 41 and the actuating frame part. First, referring to FIGS. 3A
and 4, the fixture 12 is fixed erect on the substrate 11. Two
connecting stands 32 are placed on the outsides of both fixtures
12. Both ends of the spring connecting stand 32 are interconnected
by spring members 31. Another two spring members 31 extend from the
inside of each spring connecting stand 32 to be fixed to the sides
of both fixtures 12. The middle portion of the spring member 31
disposed on the side of the stage 41 is connected to the second
actuating main frame 33.
[0030] Referring to FIG. 3B, the comb directional deformable spring
part 30' for supporting the inside of the actuating frame part
includes an extension 33' extending from the second actuating main
frame 33. The extension 33' is parallel to the comb normal
directional deformable spring 37. Two parallel spring members 31'
extending from one side of the extension 33' are connected to both
ends of a spring connecting stand 32. A fixture 12 is located
between the spring members 31', and another two parallel spring
members 31' are located between the fixture 12 and the spring
connecting stand 32.
[0031] An electrostatic force resulting from a voltage difference
between the actuating comb electrode 35 and the fixed comb
electrode 23 is used to move the stage 41 in the X-Y direction on a
plane. An electrostatic force is exerted in four actuating
directions, that is, a positive X direction, a negative X
direction, a positive Y direction, and a negative Y direction which
are right, left, top, and bottom with respect to the stage 41. The
magnitudes of the electrostatic force are controlled by voltages
73, 74, 75, and 76 applied between each of the fixed frame
electrodes and each of the actuating frame electrodes, which are
independently generated in each direction. The magnitudes of an
electrostatic force in turn control the distance by which the stage
41 is moved. To prevent the stage 41 from moving in a direction
perpendicular to an actuation plane due to gravitation and other
external loads, a voltage 77 is applied between the fixed plate
electrode 14 and the stage 41 in order to impart an attractive
force to the stage 41.
[0032] FIG. 6 shows a simple model diagram showing the principle of
actuating a single stage microactuator in which actuating frames
form a single electrode. In the case of actuation in the positive X
direction, as shown in FIG. 7, an electrostatic force 61 resulting
from a voltage difference between a fixed comb electrode 23a and an
actuating comb electrode 35a, both of which are positioned in the
positive X direction, enables a stage 41a to be moved in the
positive X direction. In this case, a comb directional deformable
spring 31a among springs 31a and 37a connected to an actuating main
frame 35a positioned in the positive X direction is deformed in the
positive X direction to enable the actuating main frame 35a to move
in the positive X direction. As the actuating main frame 35a is
moved in the positive X direction, a tension force is exerted on a
comb normal directional deformable spring 37a parallel to the X
direction to enable the stage 41a to be moved in the actuating
direction. A comb normal directional deformable spring 37c
connected to the stage 41a in the negative X direction is moved
with an actuating main frame 35c in the direction in which the
stage 41a is moved. On the other hand, comb normal directional
deformable springs 37b and 37d connected to the stage 41a in a
direction perpendicular to the actuating direction are deformed in
the positive X direction along a direction in which the stage 41a
is moved. Actuating mainframes 35b and 35d connected to the
deformed comb normal directional deformable springs 37b and 37d,
respectively, remain at the same locations without movement by comb
directional deformable springs 31b and 31d connected to themselves
in the positive X direction which is the actuating direction. This
is because the stiffness in the X direction of the comb directional
deformable springs 31b and 31d connected to the actuating main
frames 35b and 35d is significantly higher than that of the comb
normal directional deformable springs 37b and 37d.
[0033] FIG. 7 shows the original shape 50 and a deformed shape 51
of the single-stage microactuator actuated in the positive X
direction. The same is true of actuation in the Y direction. FIG. 8
shows a deformed shape 52 of a single-stage microactuator when
electrostatic forces 61 and 62 are exerted in the positive X
direction and the negative Y direction for two-way actuation. In
this case, the actuating main frames 35a, 35b, 35c, and 35d are
moved in the X or Y direction in which they are placed. The comb
direction aide for mable springs 31a, 31b, 31c, and 31d for
supporting the actuating main frames 35a, 35b, 35c, and 35d are
deformed to allow the movement thereof. Also, the comb directional
deformable springs 31a, 31b, 31c, and 31d prevents the motion of
the actuating main frames 35a, 35b, 35c, and 35d in a direction
perpendicular to axes on which they are positioned. However, The
comb normal directional deformable springs 37a, 37b, 37c, and 37d
connecting the stage 41a with the actuating main frames 35a, 35b,
35c, and 35d, respectively, are deformed in a direction
perpendicular to axes on which they are positioned and further
affected by a tensile force in their axis direction, thereby
providing two-way actuation of the stage 41a. In this case, the
comb normal directional deformable springs 37a, 37b, 37c, and 37d
are deformed in a direction perpendicular to a longitudinal
direction thereof, and at the same time, affected by a tensile
force in the longitudinal direction, thereby producing a stiffness
hardening effect.
[0034] As described above, a probe in the microactuator according
to the present invention always approaches the same position on a
medium. For the probe to read or write new information from or to
the medium, the location of the medium must be changed relative to
the position approached by the probe. That is, the input/output of
data is controlled by the probe, while the position at which data
is stored is determined by the stage microactuator. The stage
microactuator is capable of moving the medium having two degrees of
freedom.
[0035] The microactuator according to the present invention uses
micro-electromechanical system (MEMS) techniques to be realized on
a silicon wafer. Also, the microactuator is capable of actuation by
applying an electrostatic force of a comb type structure.
[0036] The single-stage microactuator according to the present
invention used in a storage device includes the use of a single
electrode in an actuating part, thereby simplifying a fabrication
process without an isolation process. Furthermore, the single-stage
microactuator according to the present invention is configured
stably to prevent occurrences of motion other than X-Y plane of
motion due to a large stage and to maximize the area of a stage
(storage area) over the total area thereof.
[0037] The single-stage microactuator according to the present
invention used in a storage device is capable of multi-dimensional
actuation with a single electrode in an actuating part and
eliminates the need for an isolation process to simplify a
fabrication process. Furthermore, the single-stage microactuator
has a spring-supported structure capable of preventing occurrences
of motion other than the X-Y plane of motion, even if a stage with
media larger than a predetermined size is mounted. In addition, the
microactuator has an effective arrangement in which the area of a
stage (storage area) over the total area is maximized.
[0038] While this invention has been particularly shown and
described with reference to preferred embodiments thereof, it will
be understood by those skilled in the art that various changes in
form and details may be made therein without departing from the
spirit and scope of the invention as defined by the appended
claims.
* * * * *