U.S. patent application number 09/243954 was filed with the patent office on 2002-02-07 for electronic camera.
Invention is credited to KAWAMURA, TOMOAKI, OTA, HIDEFUMI, TSUKAHARA, DAIKI.
Application Number | 20020015592 09/243954 |
Document ID | / |
Family ID | 26400543 |
Filed Date | 2002-02-07 |
United States Patent
Application |
20020015592 |
Kind Code |
A1 |
KAWAMURA, TOMOAKI ; et
al. |
February 7, 2002 |
ELECTRONIC CAMERA
Abstract
An electronic camera includes: a substantially rectangular
parallelepiped image-capturing unit main body provided with an
image-capturing device for generating an image signal by capturing
an optical image formed by a photographic lens unit; a
substantially rectangular parallelepiped display unit main body
provided with an external display device for displaying an image
based upon the image signal generated by the image-capturing
device; and a linking portion that links the image-capturing unit
main body and the display unit main body in a manner that the
image-capturing unit main body and the display unit main body can
rotate relative to each other. And, at the display unit main body,
a shutter release button is provided and a grip portion is provided
near an end surface furthest away from the image-capturing unit
main body; and at the image-capturing unit main body, an optical
viewfinder unit is provided beside the photographic lens unit.
Inventors: |
KAWAMURA, TOMOAKI;
(KAWASAKI, JP) ; TSUKAHARA, DAIKI; (TOKYO, JP)
; OTA, HIDEFUMI; (TOKYO, JP) |
Correspondence
Address: |
OLIFF & BERRIDGE
JAMES OLIFF
P O BOX 19928
ALEXANDRIA
VA
22320
|
Family ID: |
26400543 |
Appl. No.: |
09/243954 |
Filed: |
February 10, 1999 |
Current U.S.
Class: |
396/323 ;
348/E5.025; 348/E5.026; 348/E5.047 |
Current CPC
Class: |
H04N 5/2252 20130101;
H04N 5/225251 20180801 |
Class at
Publication: |
396/323 |
International
Class: |
G03B 041/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 11, 1998 |
JP |
10-059496 |
Mar 13, 1998 |
JP |
10-063349 |
Claims
What is claimed is;
1. An electronic camera comprising: a substantially rectangular
parallelepiped image-capturing unit main body provided with an
image-capturing device for generating an image signal by capturing
an optical image formed by a photographic lens unit; a
substantially rectangular parallelepiped display unit main body
provided with an external display device for displaying an image
based upon the image signal generated by said image-capturing
device; and a linking portion that links said image-capturing unit
main body and said display unit main body in a manner that said
image-capturing unit main body and said display unit main body can
rotate relative to each other, wherein: at said display unit main
body, a shutter release button is provided and a grip portion is
provided near an end surface furthest away from said
image-capturing unit main body; and at said image-capturing unit
main body, an optical viewfinder unit is provided beside said
photographic lens unit.
2. An electronic camera according to claim 1, wherein: said linking
portion links said image-capturing unit main body and said display
unit main body so that one surface of said substantially
rectangular parallelepiped image-capturing unit main body and one
surface of said substantially rectangular parallelepiped display
unit main body face opposite each other; and said optical
viewfinder unit and said photographic lens unit are provided at
said image-capturing unit main body so that optical axes of said
optical viewfinder unit and said photographic lens unit are aligned
in a longitudinal direction of said one surface of said
image-capturing unit main body.
3. An electronic camera according to claim 2, wherein: a distance
from a first surface of said image-capturing unit main body at
which an objective window of said optical viewfinder unit is
provided to a central axis of rotation and a distance from a second
surface of said image-capturing unit main body at which an eyepiece
window of said optical viewfinder unit is provided to said central
axis are set equal to each other.
4. An electronic camera according to claim 1, wherein: individual
components constituting said image-capturing unit main body and
said display unit main body are positioned to ensure that a center
of gravity of said electronic camera is located in said display
unit main body.
5. An electronic camera according to claim 4, wherein: a battery
chamber for housing a battery is provided at said display unit main
body toward said end surface; and said photographic lens unit is
provided at said image-capturing unit main body further toward said
linking surface relative to said optical viewfinder unit.
6. An electronic camera according to claim 1, wherein: one or more
connector terminals for connection with external apparatuses are
provided at said display unit main body.
7. An electronic camera according to claim 6, wherein: one of said
connector terminals for connection with external apparatuses is an
external power source terminal.
8. An electronic camera according to claim 6, wherein: among said
connector terminals for connection with external apparatuses, a
digital input/output terminal is provided at said end surface of
said display unit main body.
9. An electronic camera according to claim 1, wherein: said
image-capturing unit main body is further provided with a flash
unit.
10. An electronic camera according to claim 1, wherein: said flash
unit is provided with said optical viewfinder unit positioned
between said photographic lens unit and said flash unit.
11. An electronic camera according to claim 1, wherein: said grip
portion is formed in an elongated shape and is provided near said
end surface along a longitudinal direction of said end surface.
12. An electronic camera comprising: a substantially rectangular
parallelepiped image-capturing unit main body provided with a
photographic lens unit, a photographic lens unit drive device for
driving back and forth at least a portion of said photographic lens
unit and an image-capturing device for generating an image signal
by capturing an optical image formed by said photographic lens
unit; a substantially rectangular parallelepiped display unit main
body provided with an external display device for displaying an
image based upon the image signal generated by said image-capturing
device; and a linking portion that links said image-capturing unit
main body and said display unit main body in a manner that said
image-capturing unit main body and said display unit main body can
rotate relative to each other, wherein: said photographic lens
drive device is provided at said image-capturing unit main body on
a side that is distanced across said photographic lens unit from a
linking surface linking said image-capturing unit main body with
said display unit main body.
13. An electronic camera according to claim 12, wherein: an optical
viewfinder unit is provided at said image-capturing unit main body
on the side distanced from said linking surface, beside said
photographic lens unit; and said photographic lens drive device is
provided in a space formed between said photographic lens unit and
said optical viewfinder unit.
14. An electronic camera according to claim 13, wherein: said
photographic lens unit is formed in a substantially cylindrical
shape and said space is formed along an external circumference of
the cylindrical shape.
15. A camera comprising: an optical unit provided with a
photographic optical system that has at least a first lens group
and a second lens group and forms an image of a subject, an
image-capturing device that captures an image of the subject via
said photographic optical system, a first drive device that drives
back and forth said first lens group, a second drive device that
drives back and forth said second lens group, and an optical
viewfinder that forms a view field image, wherein at said optical
unit, said photographic optical system and said optical viewfinder
are provided beside each other, and said first drive device and
said second drive device are each arranged in either one of two
spaces formed between said photographic optical system and said
optical viewfinder in a direction intersecting a direction in which
said photographic optical system and said optical viewfinder are
provided beside each other.
16. A camera according to claim 15, wherein: at said optical unit,
a guide shaft for both said first lens group and said second lens
group is arranged in a middle space enclosed by said photographic
optical system, said viewfinder optical system, said first drive
device and said second drive device.
17. A camera according to claim 15, wherein: said optical unit has
a first sensor for detecting a lens position of said first lens
group and a second sensor for detecting a lens position of said
second lens group; one of said first sensor and said second sensor
is arranged in a space extending from said first drive device along
a direction of lens optical axis; and another one of said second
sensor and said first sensor is arranged in a space extending from
said second drive device along the direction of the lens optical
axis.
18. A camera according to claim 15, wherein said optical unit has:
a zoom control device that varies a zoom quantity for said
photographic optical system by controlling said first drive device
and said second drive device; a focal point control device that
varies a focal position of said photographic optical system by
controlling said first drive device; and an interlocking mechanism
that transmits a drive force imparted by said second drive device
toward said optical viewfinder through movement of said second lens
group to cause a lens of said optical viewfinder to engage in a
zooming movement.
19. A camera according to claim 18, wherein: a control resolution
at said first drive device is finer than a control resolution at
said second drive device.
20. A camera according to claim 18, wherein: said second drive
device has a higher thrust and a longer stroke than said first
drive device.
Description
INCORPORATION BY REFERENCE
[0001] The disclosures of the following priority applications are
herein incorporated by reference:
[0002] Japanese Patent Application No. 10-59496, filed Mar. 11,
1998
[0003] Japanese Patent Application No. 10-63349, filed Mar. 13,
1998
BACKGROUND OF THE INVENTION
[0004] 1. Field of the Invention
[0005] The present invention relates to an electronic camera such
as a video camera, a digital still camera or the like.
[0006] 2. Description of the Related Art
[0007] In recent years, electronic cameras achieved by rotatably
linking an image-capturing unit main body that generates an image
by capturing the optical image of a subject and a display unit main
body that displays the image thus generated have been developed.
Under normal circumstances, a photographic lens and an image
capture element are provided at the image-capturing unit main body
of such an electronic camera. In addition, the display unit main
body is provided with a liquid crystal display (LCD).
[0008] By using this electronic camera, the operator can capture an
image of the subject with the photographic lens provided at the
image-capturing unit main body turned in any direction freely,
e.g., upward or downward as well as forward, while monitoring the
image on the display screen of the LCD provided at the display unit
main body. In addition, the image can be reproduced right on the
spot where the image has been captured for verification.
[0009] However, since the LCD provided at the display unit main
body consumes a great deal of electric power, the battery becomes
depleted quickly and, as a result, there is a problem in that image
capturing cannot be performed while visually checking images on the
display screen on the LCD over an extended period of time.
[0010] Thus, it is desirable that an optical viewfinder be mounted
at the electronic camera so that the subject can be monitored even
when the LCD is turned off.
SUMMARY OF THE INVENTION
[0011] An object of the present invention is to provide an
electronic camera having an optical viewfinder provided at a
position that assures a high degree of efficiency, which achieves
good weight balance and outstanding operability.
[0012] In order to attain the above object, an electronic camera
according to the present invention comprises: a substantially
rectangular parallelepiped image-capturing unit main body provided
with an image-capturing device for generating an image signal by
capturing an optical image formed by a photographic lens unit; a
substantially rectangular parallelepiped display unit main body
provided with an external display device for displaying an image
based upon the image signal generated by the image-capturing
device; and a linking portion that links the image-capturing unit
main body and the display unit main body in a manner that the
image-capturing unit main body and the display unit main body can
rotate relative to each other, wherein: at the display unit main
body, a shutter release button is provided and a grip portion is
provided near an end surface furthest away from the image-capturing
unit main body; and at the image-capturing unit main body, an
optical viewfinder unit is provided beside the photographic lens
unit.
[0013] In the above electronic camera, preferably: the linking
portion links the image-capturing unit main body and the display
unit main body so that one surface of the substantially rectangular
parallelepiped image-capturing unit main body and one surface of
the substantially rectangular parallelepiped display unit main body
face opposite each other; and the optical viewfinder unit and the
photographic lens unit are provided at the image-capturing unit
main body so that optical axes of the optical viewfinder unit and
the photographic lens unit are aligned in a longitudinal direction
of the one surface of the image-capturing unit main body.
Furthermore, preferably, a distance from a first surface of the
image-capturing unit main body at which an objective window of the
optical viewfinder unit is provided to a central axis of rotation
and a distance from a second surface of the image-capturing unit
main body at which an eyepiece window of the optical viewfinder
unit is provided to the central axis are set equal to each
other.
[0014] Also, preferably, individual components constituting the
image-capturing unit main body and the display unit main body are
positioned to ensure that a center of gravity of the electronic
camera is located in the display unit main body. Furthermore,
preferably: a battery chamber for housing a battery is provided at
the display unit main body toward the end surface; and the
photographic lens unit is provided at the image-capturing unit main
body further toward the linking surface relative to the optical
viewfinder unit.
[0015] Also, preferably, one or more connector terminals for
connection with external apparatuses are provided at the display
unit main body. In this case, one of the connector terminals for
connection with external apparatuses is an external power source
terminal. Preferably, among the connector terminals for connection
with external apparatuses, a digital input/output terminal is
provided at the end surface of the display unit main body.
[0016] Also, preferably, the image-capturing unit main body is
further provided with a flash unit. Furthermore, preferably, the
flash unit is provided with the optical viewfinder unit positioned
between the photographic lens unit and the flash unit.
[0017] Also, preferably, the grip portion is formed in an elongated
shape and is provided near the end surface along a longitudinal
direction of the end surface.
[0018] Another electronic camera comprises: a substantially
rectangular parallelepiped image-capturing unit main body provided
with a photographic lens unit, a photographic lens unit drive
device for driving back and forth at least a portion of the
photographic lens unit and an image-capturing device for generating
an image signal by capturing an optical image formed by the
photographic lens unit; a substantially rectangular parallelepiped
display unit main body provided with an external display device for
displaying an image based upon the image signal generated by the
image-capturing device; and a linking portion that links the
image-capturing unit main body and the display unit main body in a
manner that the image-capturing unit main body and the display unit
main body can rotate relative to each other. And the photographic
lens drive device is provided at the image-capturing unit main body
on a side that is distanced across the photographic lens unit from
a linking surface linking the image-capturing unit main body with
the display unit main body.
[0019] In this electronic camera, preferably, an optical viewfinder
unit is provided at the image-capturing unit main body on the side
distanced from the linking surface, beside the photographic lens
unit; and the photographic lens drive device is provided in a space
formed between the photographic lens unit and the optical
viewfinder unit. Furthermore, preferably, the photographic lens
unit is formed in a substantially cylindrical shape and the space
is formed along an external circumference of the cylindrical
shape.
[0020] A camera comprising: an optical unit provided with a
photographic optical system that has at least a first lens group
and a second lens group and forms an image of a subject, an
image-capturing device that captures an image of the subject via
the photographic optical system, a first drive device that drives
back and forth the first lens group, a second drive device that
drives back and forth the second lens group, and an optical
viewfinder that forms a view field image. And, at the optical unit,
the photographic optical system and the optical viewfinder are
provided beside each other, and the first drive device and the
second drive device are each arranged in either one of two spaces
formed between the photographic optical system and the optical
viewfinder in a direction intersecting a direction in which the
photographic optical system and the optical viewfinder are provided
beside each other.
[0021] In this camera, preferably, at the optical unit, a guide
shaft for both the first lens group and the second lens group is
arranged in a middle space enclosed by the photographic optical
system, the viewfinder optical system, the first drive device and
the second drive device.
[0022] Also, preferably, the optical unit has a first sensor for
detecting a lens position of the first lens group and a second
sensor for detecting a lens position of the second lens group; one
of the first sensor and the second sensor is arranged in a space
extending from the first drive device along a direction of lens
optical axis; and another one of the second sensor and the first
sensor is arranged in a space extending from the second drive
device along the direction of the lens optical axis.
[0023] Also, preferably, the optical unit has: a zoom control
device that varies a zoom quantity for the photographic optical
system by controlling the first drive device and the second drive
device; a focal point control device that varies a focal position
of the photographic optical system by controlling the first drive
device; and an interlocking mechanism that transmits a drive force
imparted by the second drive device toward the optical viewfinder
through movement of the second lens group to cause a lens of the
optical viewfinder to engage in a zooming movement. Furthermore,
preferably, a control resolution at the first drive device is finer
than a control resolution at the second drive device. Or,
preferably, the second drive device has a higher thrust and a
longer stroke than the first drive device.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] FIG. 1 is an external view of the front of an electronic
camera 100 viewed diagonally from above;
[0025] FIG. 2 is an external view of the rear of the electronic
camera 100 viewed diagonally from above;
[0026] FIG. 3 is a cross section of the electronic camera 100 along
line A-A in FIG. 2 viewed in the direction indicated by the
arrows;
[0027] FIG. 4 is a cross section of the electronic camera 100 along
line B-B in FIG. 2 viewed in the direction indicated by the
arrows;
[0028] FIG. 5 is an external view illustrating the electronic
camera 100 during a photographing operation;
[0029] FIG. 6 is an external view of an electronic camera 100;
[0030] FIG. 7 is a lateral cross section of the optical unit 103
along line A-A' in FIG. 6;
[0031] FIG. 8 is a longitudinal cross section along line B-B' in
FIG. 7;
[0032] FIG. 9 is a longitudinal cross section along line C-C' in
FIG. 7;
[0033] FIG. 10 is a longitudinal cross section along line D-D' in
FIG. 7;
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0034] The following is an explanation of an embodiment of the
present invention given in reference to FIGS. 1-5.
[0035] An electronic camera 100 in the embodiment is constituted by
linking an image-capturing unit main body 10 that captures an
optical image of a subject to generate an image and a display unit
main body 30 that displays the image thus generated via a rotatable
joint portion 50 as illustrated in FIG. 1 (an external view of the
front viewed diagonally from above). At the rotatable joint portion
50, two cylindrical members having different diameters are fitted
together in such a manner that they can rotate both in the forward
and reverse directions.
[0036] Thus, the image-capturing unit main body 10 and the display
unit main body 30 of the electronic camera 100 can rotate freely
relative to each other around a central axis 50a of the rotatable
joint portion 50. It is to be noted, however, that a stopper that
restricts the ranges of the rotating angles of the image-capturing
unit main body 10 and the display unit main body 30 is provided at
the area of the rotatable joint portion 50 where the two members
fit together (not shown). The image-capturing unit main body 10 and
the display unit main body 30 both have substantially or
approximately rectangular parallelepiped shapes, which are roughly
identical in shape and size. In addition, the central axis of
rotation 50a mentioned above passes through the centers of the
image-capturing unit main body 10 and the display unit main body
30.
[0037] Consequently, when the image-capturing unit main body 10 and
the display unit main body 30 are aligned together without either
of them rotated at a rotating angle of 0.degree. (see FIG. 1), a
linking surface 10a of the image-capturing unit main body 10 that
links with the display unit main body 30 and a linking surface 30a
of the display unit main body 30 that links with the
image-capturing unit main body 10 are in complete alignment with
each other, so that the entire electronic camera 100 achieves a
thin, substantially or roughly rectangular parallelepiped
shape.
[0038] The wiring for electrically connecting the components inside
the image-capturing unit main body 10 and the components inside the
display unit main body 30 are inserted through hollow portions of
the cylindrical members at the rotatable joint portion 50.
[0039] Next, the components provided at the image-capturing unit
main body 10 and the components provided at the display unit main
body 30 are explained individually.
[0040] As illustrated in FIG. 2 (an external view of the rear seen
from diagonally above), an LCD display window 31 for displaying
images and the like is provided at a rear surface 30b of the
display unit main body 30. At the rear surface 30b, a display
button 32 and a zoom button 33 are provided. Inside the display
unit main body 30 in the vicinity of the rear surface 30b, an LCD
41 is provided as illustrated in the sectional view (FIG. 3) viewed
in the direction indicated by the arrows across line A-A in FIG.
2.
[0041] The LCD 41 is exposed to the outside through the LCD display
window 31 provided at the rear surface 30b. In other words, the
display screen of the LCD 41 is visible from the outside through
the LCD display window 31. The LCD 41 implements display of images
sent out from the image-capturing unit main body 10, reproduction
of photographed images, display of setting menus for the electronic
camera 100 and display of a list of functions of the electronic
camera 100.
[0042] The display button 32 (FIG. 2) mentioned earlier provided at
the rear surface 30b is operated to switch the display at the LCD
41 and to turn on/off the LCD. A shutter release button 35 is
provided at an upper surface 30d of the display unit main body 30.
At the upper surface 30d, a display window 36 of the display panel
(not shown) and setting buttons 37 are provided.
[0043] The setting buttons 37 constitute a group of buttons for
setting or clearing a photographing mode for the electronic camera
100. Photographing information such as the photographing mode of
the electronic camera 100 set by using the setting buttons 37, the
number of photographic frames and the like is displayed on a
display panel (not shown), which is visible through the display
window 36.
[0044] A digital input/output terminal 45 is provided at an end
surface 30e of the display unit main body 30 which is at the
greatest distance from the image-capturing unit main body 10. A
communications cable from an outside computer is connected to the
digital input/output terminal 45. In the vicinity of the end
surface 30e, an elongated grip portion 34 (FIG. 1) is provided
along the longitudinal direction (the direction of the longer axis)
of the end surface 30e. The elongated grip portion 34 projects out
at a front surface 30c of the display unit main body 30.
[0045] In the upper portion of the front surface 30c, a video
output terminal 46 and an external power source terminal 47 are
provided. A cable from a television set, which is an external
apparatus, is connected to the video output terminal 46. Inside the
display unit main body 30 toward the end surface 30e, a battery
chamber 42 for housing a battery is located, as illustrated in FIG.
3. In addition, inside the display unit main body 30, a circuit
board 43 required for image processing is provided adjacent to the
LCD 41. A loading chamber for a memory card which can be attached
and detached freely (not shown) is also provided inside the display
unit main body 30.
[0046] Now, at an upper surface of the image-capturing unit main
body 10, a photographic lens opening portion 11, a viewfinder
objective window 12 and a flash light-emitting window 13 are
provided sequentially in that order starting from the side where
the linking surface 10a linking with the display unit main body 30
is present, as illustrated in FIG. 2. At a lower surface 10c of the
image-capturing unit main body 10, a viewfinder eyepiece window 14
is provided facing opposite the viewfinder objective window 12
mentioned earlier.
[0047] Inside the image-capturing unit main body 10, a photographic
lens unit 21, an optical viewfinder unit 22 and an electronic flash
unit 23 are provided sequentially in that order starting from the
side where the linking surface 10a linking with the display unit
main body 30 is present, as illustrated in the cross section along
line B-B in FIG. 2 viewed in the direction indicated by the arrows
(FIG. 4).
[0048] The photographic lens unit 21, the optical viewfinder unit
22 and the electronic flash unit 23 all have a columnar shape, with
their optical axes aligned in the longitudinal direction of the
linking surface 10a linking with the display unit main body 30.
[0049] Consequently, the objective-side photographic lens of the
photographic lens unit 21 is exposed to the outside through the
photographic lens opening portion 11 at the upper surface 10b. At
the optical viewfinder unit 22, the objective side is exposed to
the outside through the viewfinder objective window 12 at the upper
surface 10b, whereas its eyepiece side is exposed to the outside
through the viewfinder eyepiece window 14 at the lower surface 10c.
The subject side of the electronic flash unit 23 is exposed to the
outside through the flash light-emitting window 13 at the upper
surface 10b. Specifically, the light from the electronic flash unit
23 is irradiated to the outside through the flash light-emitting
window 13.
[0050] Inside the image-capturing unit main body 10 (FIG. 4), an
image-capturing element 24 is provided on the image space side of
the photographic lens unit 21. The photographic lens unit 21
comprises a plurality of photographic lenses for forming the
optical image of the subject on the image-capturing element 24 and
a control mechanism that adjusts the positions of the individual
photographic lenses as necessary. By changing the positions of the
photographic lenses, the optical image of the subject can be
enlarged or reduced. The photographic lens positions are changed in
response to instructions issued through the zoom button 33 (FIG. 2)
at the display unit main body 30. While the length of the
photographic lens unit 21 in the direction of the optical axis is
such that it can be contained in the longitudinal direction of the
image-capturing unit main body 10, as illustrated in FIG. 4, the
length cannot be contained in the lateral direction (the direction
of the shorter axis), i.e., the thicknesswise direction of the
image-capturing unit main body 10 illustrated in FIG. 3.
[0051] The optical viewfinder unit 22 indicates to the operator the
range over which photographing is possible. The electronic flash
unit 23 emits flash light to the outside over a specific range
through the flash light-emitting window 13 provided at the upper
surface 10b.
[0052] At the electronic camera 100 structured as described above,
the image-capturing unit main body 10 and the display unit main
body 30 are made to rotate by a specific angle, as illustrated in
FIG. 5, during a photographing operation so that the photographic
lens opening portion 11, the viewfinder objective window 12 and the
flash light-emitting window 13 provided at the upper surface 10b of
the image-capturing unit main body 10 are turned toward the
subject.
[0053] As explained above, since the image-capturing unit main body
10 and the display unit main body 30 are rotatably linked via the
rotatable joint portion 50 in the electronic camera 100 in the
embodiment, the photographic lens opening portion 11 (the
photographic lens unit 21) is positioned toward the subject for
photographing by causing the image-capturing unit main body 10 to
rotate relative to the display unit main body 30 regardless of the
direction in which the subject is located.
[0054] Since the optical viewfinder unit 22 is provided beside the
photographic lens unit 21 at the rotating image-capturing unit main
body 10, the photographic view angle achieved by the photographic
lens unit 21 can be observed accurately by using the optical
viewfinder unit 22 for photographing regardless of the setting of
the rotating angle of the image-capturing unit main body 10
relative to the display unit main body 30.
[0055] Since the electronic flash unit 23 is provided beside the
photographic lens unit 21 at the rotating image-capturing unit main
body 10, flash light can be accurately distributed for
photographing regardless of the setting of the rotating angle of
the image-capturing unit main body 10 relative to the display unit
main body 30.
[0056] Since the elongated grip portion 34 is provided at the
display unit main body 30 in the electronic camera 100 in the
embodiment, the operator can adjust the angle of his hand holding
the elongated grip portion 34 provided at the display unit main
body 30 according to the liking of the operator while maintaining
it in the longitudinal direction so that a stable photographing
attitude can be maintained at all times, regardless of the
direction in which the image-capturing unit main body 10 (the
photographic lens unit 21, the optical viewfinder unit 22) is
positioned.
[0057] In particular, in a photographing operation performed while
looking into the optical viewfinder unit 22, in which the face of
the operator and the electronic camera 100 are placed in close
proximity, the photographing operability is improved by maintaining
a stable photographing attitude.
[0058] Since the central axis of rotation 50a passes through the
center of the image-capturing unit main body 10 in the electronic
camera 100 in the embodiment, the distance L1 from the upper
surface 10b where the viewfinder objective window 12 is provided to
the central axis 50a and the distance L2 from the lower surface 10c
where the viewfinder eyepiece window 14 is provided to the central
axis 50a are set equal to each other, as illustrated in FIG. 5.
[0059] As a result, when the image-capturing unit main body 10 is
caused to rotate relative to the display unit main body 30 to
position the photographic lens unit 21 toward the subject (the
state illustrated in FIG. 5), the lower surface 10c at which the
viewfinder eyepiece window 14 is provided is caused to project out
further rearward relative to the display unit main body 30. Thus,
the operator can set his eye close to the viewfinder eyepiece
window 14 without getting the projecting portions of his face (such
as his nose) in the way, so that he can use the viewfinder with
ease.
[0060] In addition, since, in the rotated image-capturing unit main
body 10, the side with the upper surface 10b projecting out further
forward relative to the display unit main body 30 and the side with
the lower surface 10c projecting out further rearward relative to
the display unit main body 30 are almost balanced with regard to
moment, the state of the rotation of the image-capturing unit main
body 10 relative to the display unit main body 30 is stabilized
with good balance so that the rotating angle setting of the
image-capturing unit main body 10 is fixed.
[0061] As illustrated in FIG. 3, the battery chamber 42 having the
largest weight inside the display unit main body 30 is located
toward the end surface 30e, furthest away from the image-capturing
unit main body 10, and the photographic lens unit 21 having the
largest weight within the image-capturing unit main body 10 is
located toward the linking surface 10a, in the electronic camera
100 in the embodiment.
[0062] Consequently, even though the optical viewfinder unit 22 and
the electronic flash unit 23 are provided at the image-capturing
unit main body 10, the center of gravity of the electronic camera
100 is located in the display unit main body 30. When the
electronic camera 100 is placed on a table with the rotational
central axis 50a extending in the horizontal direction in a state
in which the image-capturing unit main body 10 is caused to rotate
relative to the display unit main body 30 to position the
photographic lens unit 21 toward the subject (FIG. 5), only a lower
surface 30f of the display unit main body 30 is placed in contact
with the upper surface of the table.
[0063] Thus, the image-capturing unit main body 10, which has been
caused to rotate relative to the display unit main body 30 by a
specific angle, is in a state in which it is lifted upward off the
upper surface of the table by a height H. However, since the center
of gravity of the electronic camera 100 is located in the display
unit main body 30 as explained above, the electronic camera 100
placed on the table does not fall toward the image-capturing unit
main body 10. As a result, the electronic camera 100 stands erect
with good balance while the lower surface 30f of the display unit
main body 30 stays in contact with the upper surface of the
table.
[0064] Thus, the electronic camera 100 can be placed on a table
without having to use a tripod to perform self-timer photographing
in a stable manner to achieve maximum convenience in use. In
addition, the electronic camera does not fall toward the
image-capturing unit main body to hit the table, which may result
in a shock-induced operating defect. In other words, the electronic
camera 100 achieves both a function of photographing while
accurately monitoring the angle of photographic view with the
optical viewfinder unit 22 and a function of self-timer
photographing performed on a table.
[0065] Since the battery chamber 42 (FIG. 3) having the largest
weight in the display unit main body 30 is located toward the end
surface 30e furthest away from the image-capturing unit main body
10, i.e., inside the elongated grip portion 34 provided at the
display unit main body 30, the operator can hold the electronic
camera 100 in a stable manner. Thus, the operability of the camera
in his hand improves.
[0066] As illustrated in FIG. 4, the connector terminals (the
digital input/output terminal 45, the video output terminal 46) for
connection with external apparatuses and the external power source
terminal 47 are provided at the display unit main body 30 in the
electronic camera 100 in the embodiment. Consequently, when the
electronic camera 100 is placed on a table, it does not fall toward
the image-capturing unit main body 10 due to imbalance even if
specific cables are connected to the terminals 45-47, since the
weight of the connected cables works toward the display unit main
body 30.
[0067] In particular, even when a communications cable mounted with
a noise prevention core for electromagnetic wave prevention is
connected to the digital input/output terminal 45 located at the
end surface 30e of the display unit main body 30, the weight of the
connected communications cable works toward the end surface 30e of
the display unit main body 30 so that the camera stands erect in a
stable manner without falling toward the image-capturing unit main
body 10 due to imbalance.
[0068] In addition, as illustrated in FIG. 5, since the video
output terminal 46 and the external power source terminal 47 are
provided in the upper portion of the front surface 30c of the
display unit main body 30, the operator can perform operations such
as photographing and image viewing while holding the grip portion
34 of the electronic camera 100 without touching a cable from the
television set connected to the video output terminal 46 or a power
source cable connected to the external power source terminal
47.
[0069] Furthermore, since the photographic lens unit 21, the
optical viewfinder unit 22 and the electronic flash unit 23 are
provided inside the image-capturing unit main body 10 with their
optical axes aligned in the longitudinal direction of the linking
surface 10a which links with the display unit main body 30 in the
electronic camera 100 in the embodiment (FIGS. 3 and 4), the
image-capturing unit main body 10 can be formed in a thin,
substantially rectangular parallelepiped shape (FIGS. 1 and 2).
Consequently, the entire electronic camera 100 also achieves a thin
shape. Thus, the electronic camera 100 itself can be stored in a
compact manner to improve portability. Specifically, even when the
length of the photographic lens unit 21 in the direction of the
optical axis cannot be contained within the dimension of the
electronic camera in the thicknesswise direction (the direction
perpendicular to the display screen at the display unit), the
entire electronic camera 100 achieves a thin shape by adopting the
structure described above.
[0070] When performing a photographing operation while viewing the
subject through the viewfinder eyepiece window 14, the power at the
LCD 41 (FIG. 3) can be set to off through an operation performed
through the display button 32 (FIG. 2) to save battery power. The
photographed image can be checked through the LCD display window 31
by displaying the image with the power of the LCD 41 turned on
through an operation of the display button 32.
[0071] Since the flash light-emitting window 13 is positioned away
from the photographic lens opening portion 11 by a distance
corresponding to the width of the viewfinder objective window 12,
the likelihood of living photographic subjects such as people or
animals manifesting the red-eye phenomenon can be minimized.
[0072] Since the electronic flash unit 23 is provided at an
isolated position over the optical viewfinder unit 22, the
likelihood of a portion of the electromagnetic wave generated at
the electronic flash unit 23 entering the transmission path through
which image signals are transmitted as noise to adversely affect
the image is eliminated.
[0073] Since the photographic lens opening portion 11 is positioned
the closest to the linking surface 10a in the image-capturing unit
main body 10, the likelihood of the photographic lens opening
portion 11 becoming covered by the fingers of the operator is low
compared to the likelihood of the flash light-emitting window 13
and the viewfinder objective window 12 becoming covered. Thus, the
photographic lens opening portion 11 is prevented from becoming
soiled due to contact with fingers. In addition, photographing
errors caused by the photographic lens opening portion 11 being
covered by fingers can be avoided.
[0074] Since the shutter release button 35 is located at a position
at the display unit main body 30 that can be easily reached by the
operator holding the electronic camera 100 at the grip portion 34
by gently bending his index finger, the shutter release button 35
can be operated with a high degree of reliability even while the
operator is looking into the viewfinder eyepiece window 14.
[0075] Since the zoom button 33 is located at a position that can
be easily reached by the operator holding the electronic camera 100
at the grip portion 34 with his thumb, the zoom button 33 can be
operated with a high degree of reliability even while he is looking
into the viewfinder eyepiece window 14.
[0076] Since the setting buttons 37, which are not used during a
photographing operation, are provided at positions that cannot be
readily reached by any fingers when the operator is holding the
electronic camera 100 at the grip portion 34, the error whereby the
photographing mode of the electronic camera 100 is inadvertently
changed with a finger touching a setting button during a
photographing operation can be prevented.
[0077] The display window 36, too, is provided at a position that
cannot be easily reached by any fingers when the operator is
holding the electronic camera 100 at the grip portion 34 and, as a
result, since no fingers come in contact with the display window.
Thus, dirt caused by fingerprints and the like can be
prevented.
[0078] By providing the mechanism for stabilizing the rotating
angle of the image-capturing unit main body 10 relative to the
display unit main body 30 at a desired angle at the fitting area of
the rotatable joint portion 50, the rotating angle of the
image-capturing unit main body 10 is fixed to reliably prevent
photographing errors caused by camera vibration with hand
tremble.
[0079] While the explanation is given above in reference to the
embodiment by citing an example in which the present invention is
adopted in a digital still camera, the present invention may be
adopted in a video camera that handles motion pictures. In that
case, an image-capturing button for performing operations such as a
photographing start and a photographing end should be provided
instead of the shutter release button 35 and the zoom button should
be utilized as a switching button for switching among zoom forward,
zoom back, neutral and the like. Furthermore, the present invention
may be adopted in an analog electronic still camera. In other
words, the present invention may be adopted in all types of
electronic cameras having an image-capturing unit main body and a
display unit main body rotatably linked with each other.
[0080] Optical unit
[0081] Next, a detailed explanation is given on an optical unit 103
(FIG. 6) comprising the photographic lens unit (photographing
optical system) 21, the image-capturing element 24 and the optical
viewfinder unit 22, provided inside the image-capturing unit main
body 10. FIG. 6 is an external view of an electronic camera, which,
while slightly different from the electronic camera 100 illustrated
in FIGS. 1 and 2 in appearance, is nevertheless, an equivalent type
of electronic camera. Thus, the same reference numbers are assigned
to elements having identical functions to those illustrated in
FIGS. 1 and 2 to preclude the necessity for repeated explanation
thereof. The optical unit 103 is provided inside the
image-capturing unit main body 10.
[0082] FIG. 7 is a sectional view of the optical unit 103 across
the lateral direction containing line A-A' in FIG. 6. In FIG. 7,
the optical unit 103 is constituted by providing the photographic
lens unit 21 and the optical viewfinder unit 22 beside one another
laterally. At the photographic lens unit 21, a first lens group
111, a second lens group 112 and a third lens 113 are provided
sequentially in this order starting from the objective side. Mainly
by moving the second lens group 112 and by slightly moving the
first lens group 111 for purposes of correction, the zoom power
(focal length) of the photographic lens unit 21 is varied.
[0083] By driving the first lens group 111 back and forth by
itself, the focal point adjustment is performed at the photographic
lens unit 21. Behind the third lens 113, the image-capturing
element 24 is provided via a filter 114a for cutting infrared
light. The third lens 113, the filter 114a and the image-capturing
element 24 are held together by a CCD holder 114b.
[0084] In the space between the photographic lens unit 21 and the
optical viewfinder unit 22, a guide shaft 121 is provided. In
addition, in the space between a casing 103a of the optical unit
103 and the photographic lens unit 21 (the upper side in FIG. 7), a
rotation stopper shaft 122 is provided. The guide shaft 121 and the
rotation stopper shaft 122 are both secured by the casing 103a at
one end and by the CCD holder 114b at the other end.
[0085] The periphery of the lenses in the first lens group 111
mentioned earlier is held by a first lens chamber 111a. A holder
portion 111z projects out from each side of the first lens chamber
111a. With the holder portions 111z holding the guide shaft 121 and
the rotation stopper 122, the first lens group 111 is positioned at
the center of the photographing light path.
[0086] The periphery of the second lens group 112 is held by a
second lens chamber 112a. A holder portion 112z projects out from
each side of the second lens chamber 112a. With the holder portions
112z holding the guide shaft 12 and the rotation stopper 122, the
second lens group 112 is positioned at the center of the
photographing light path.
[0087] Directly in front of the second lens group 112, a shutter
unit 112b is provided. The shutter unit 112b, which is secured to
the second lens chamber 112a, travels back and forth together with
the second lens group 112.
[0088] From the holder portion 112z of the second lens chamber
112a, a follower pin 112c projects out. The follower pin 112c is
fitted inside a cam groove at a cam plate 123. The cam plate 123
travels as the follower pin 112c moves back and forth. In the other
two cam grooves at the cam plate 123, follower pins 131c and 132c
toward the optical viewfinder unit 22 are respectively fitted. The
follower pin 131c is provided projecting at a first viewfinder lens
131 of the optical viewfinder unit 22. The follower pin 132c is
provided projecting at a second viewfinder lens 132 of the optical
viewfinder unit 22.
[0089] The cam plate 123 structured as described above causes the
first viewfinder lens 131 and the second viewfinder lens 132 to
engage in a zooming movement by interlocking with the zooming
movement of the second lens group 112. A prism 133 is provided to
the rear of the second viewfinder lens 132. The prism 133 sets the
view field image formed by the optical viewfinder unit 22 upright
and guides it to the eyepiece window.
[0090] FIG. 8 is a longitudinal section along line B-B' in FIG. 7.
FIG. 9 is a longitudinal section along line C-C' in FIG. 7. As
illustrated in FIGS. 8 and 9, a first motor 115 and a second motor
118 are provided in two spaces 141 and 142 respectively which are
formed in a direction (the longitudinal direction in the figures)
intersecting the direction (the lateral direction in the figures)
in which the photographic lens unit 21 and the optical viewfinder
unit 22 are provided beside each other, between the photographic
lens unit 21 and the optical viewfinder unit 22. In addition, the
guide shaft 121 is provided in a middle space 143 enclosed by the
photographic lens unit 21, the optical viewfinder unit 22, the
first motor 115 and the second motor 118.
[0091] FIG. 10 is a longitudinal section along line D-D' in FIG. 7.
As illustrated in FIG. 10, a holder portion 111z of the first lens
chamber 111a is formed in a flat U shape to hold the guide shaft
121 at two positions. At the rear side of the holder portion 111z,
a screw receptacle 111d projects. A screw 115a of the first motor
115 comes in contact with the screw receptacle 111d. At the front
side of the holder portion 111z, one end of a spring 117 is secured
to apply a force to the holder portion 111z to pull the first lens
chamber 111a rearward.
[0092] In the front space extending along the photographic optical
axis from the first motor 115, a photo-interrupter 116 is provided.
A slit 111e, which projects at the holder portion 111z, passes
through the photo-interrupter 116. The photo-interrupter 116 is a
positional sensor for detecting the position of the origin point of
the first lens group 111.
[0093] The slide mechanism for the first lens group 111 described
above is set so that:
[0094] (1) stroke length . . . 7 mm;
[0095] (2) thrust . . . 50 gf; and
[0096] (3) control resolution . . . 1.5 .mu.m.
[0097] A holder portion 112z of the second lens chamber 112a is
formed in an inverted flat U shape to hold the guide shaft 121 at
two positions. A rack member 118b is linked to the holder portion
112z via a linking portion 112d. The rack member 118b travels back
and forth as a ball screw 118a at the second motor 118 rotates both
in the forward and reverse directions. In addition, in the front
space extending along the photographic optical axis from the second
motor 118, a photo-interrupter 119 is provided. A slit 112e, which
projects at the holder portion 112z passes through the
photo-interrupter 119. The photo-interrupter 119 is a positional
sensor for detecting the position of the origin point of the second
lens group 112.
[0098] The slide mechanism for the second lens group 112 described
above is set so that:
[0099] (1) stroke length . . . 20 mm;
[0100] (2) thrust . . . 200 gf; and
[0101] (3) control resolution . . . 10 .mu.m.
[0102] In the structure described above, two vacant spaces 141 and
142 are formed at the optical unit between the photographic lens
unit 21 and the optical viewfinder unit 22 in the direction
intersecting the direction in which the units 21 and 22 are
provided beside each other. The spaces 141 and 142 are formed along
the round contour of the photographic lens unit 21 which is formed
in a round cylindrical shape. The first motor 115 and second motor
118 are housed in these two vacant spaces 141 and 142 respectively.
Thus, the first motor 115 and the second motor 118 can be housed by
efficiently utilizing available space to achieve miniaturization of
the optical unit 103.
[0103] Since the first motor 115 and the second motor 118 are
positioned on the side that is distanced from the linking surface
10a of the image-capturing unit main body 10 across the
photographic lens unit 21, the photographic lens unit 21 having the
largest weight in the image-capturing unit main body 10 can be
placed toward the linking surface 10a (FIG. 1). This allows the
center of gravity of the electronic camera 100 to be located toward
the display unit main body 30, to optimize the weight balance for
the entire electronic camera 100. Furthermore, while achieving
optimization of the weight balance for the entire electronic camera
100, miniaturization of the entire electronic camera 100 is
achieved through miniaturization of the optical unit 103.
[0104] At the optical unit, the guide shaft 121 is provided in the
middle space 143 enclosed by the photographic lens unit 21, the
optical viewfinder unit 22, the first motor 115 and the second
motor 118. Thus, the guide shaft 121 is housed with a high degree
of efficiency in the use of space to achieve miniaturization of the
optical unit 103.
[0105] By providing the guide shaft 121 in the central area in this
manner, the "point of application of force imparted by the first
motor 115" and the guide shaft 121 are placed in close proximity.
Thus, the effect of the reactive force occurring between them is
reduced, thereby making it possible to reduce the degree of
deflection, dynamic frictional force and the like occurring at the
first lens chamber 111a. Consequently, the first lens group 111 can
be made to slide smoothly.
[0106] By providing the guide shaft 121 in the central area, the
"point of application of force imparted by the second motor 118"
and the guide shaft 121 are placed in close proximity. Thus, the
effect of the reactive force occurring between them is reduced,
thereby making it possible to reduce the degree of deflection,
dynamic frictional force and the like occurring at the second lens
chamber 112a. Consequently, the second lens group 112 can be made
to slide smoothly.
[0107] At the optical unit in this embodiment, the
photo-interrupter 116 and the photo-interrupter 119 are
respectively provided in the spaces to the front of the first motor
115 and second motor 118. Consequently, the photo-interrupters 116
and 119 are housed with a high degree of efficiency in the use of
space to achieve miniaturization of the optical unit 103.
[0108] In particular, by providing the photo-interrupters 116 and
119 in this manner, the photo-interrupters 116 and 119 can be
provided in close proximity to the guide shaft 121. At these
positions, the photo-interrupters 116 and 119 are less likely to be
affected by deflection of the lens groups and the like to make it
possible to improve the detection accuracy of the photo-interrupter
116 and 119.
[0109] In the optical unit in this embodiment, the drive force
imparted by the second motor 118 is transmitted toward the optical
viewfinder unit 22 via the follower pin 112c of the second lens
chamber 112a. Consequently, a separate bypass path for transmitting
the drive force to the optical viewfinder unit 22 is not required,
which makes it possible to achieve miniaturization of the optical
unit 103.
[0110] The three structural features, i.e., the second motor 118,
the second lens chamber 112a and the optical viewfinder unit 22 are
provided radially around the guide shaft 121. Thus, the drive force
imparted by the second motor 118 can be transmitted to the second
lens group 112 and the optical viewfinder unit 22 with a low loss
and a high degree of stability.
[0111] In the optical unit, the stroke at the second motor 118 is
set longer than the stroke at the first motor 115. As a result, the
second lens group 112 is made to travel over a longer distance, to
make it possible to further improve the zoom power of the
photographic lens unit 21.
[0112] In the optical unit in this embodiment, the control
resolution of the first motor 115 is set lower than the control
resolution of the second motor 118. Thus, fine positioning is
achieved for the focusing position of the photographic lens unit
21, to make it possible to further improve the focusing accuracy of
the photographic lens unit 21.
[0113] In the optical unit, the thrust of the second motor 118 is
set larger than the thrust of the first motor 115. As a result, the
zooming movement of the second lens group 112 can be made at high
speed, to make it possible to complete the movement of the
photographic lens unit 21 within a short period of time.
[0114] As explained above, a more compact photographic lens unit
which also achieves a high degree of magnifying power, focusing
accuracy and high speed focusing is realized.
[0115] While an electronic camera is structured with the optical
unit provided with the image-capturing element 24 in the example
given above, the optical unit may be also adopted in a silver
halide-type film camera by, for instance, providing a film feed
mechanism for film or the like as a means for image capturing.
[0116] While the explanation is given above in reference to the
optical unit with the photographic lens unit 21 having a
three-group lens configuration, the present invention is not
limited to this structure. Generally speaking, the details
explained above may be adopted in any photographic lens unit
(photographic optical system) as long as it is constituted of a
lens configuration with N groups (N.gtoreq.2).
* * * * *