JP2004302265A - Camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera in which cost reduction and space saving are realized. <P>SOLUTION: The projecting part 33_2a of a moving range limiting member 33_2 is engaged with the cam groove of a linear motion key ring disposed at a zoom lens barrel and the attitude of the moving range limiting member 33_2 for limiting the moving range of a driving member 33_1 for driving shutter blades 31 and 32 is varied. Consequently, the moving range of the driving member 33_1 is varied to adjust the maximum aperture diameters of the shutter blades 31 and 32. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a camera for capturing an image by capturing subject light captured through a shutter that regulates the amount of light.
[0002]
[Prior art]
2. Description of the Related Art In a compact camera having a lens shutter type zoom lens, a configuration in which an aperture-type program shutter is disposed between lens groups constituting a zoom lens is often adopted. Here, a technique has been proposed for setting the aperture diameter of the aperture of the shutter blades constituting the program shutter to an appropriate value according to the focal length of the zoom lens.
[0003]
For example, a drive lever that varies the aperture diameter of the shutter blade is brought into contact with a cam portion that is inclined in the optical axis direction to regulate the drive range of the drive lever. A technique for setting a corresponding aperture diameter to an appropriate value has been proposed (see Patent Document 1).
[0004]
Also, an aperture regulating lever that regulates the maximum aperture of the shutter blade according to the amount of external pressure is brought into contact with a cam inclined in the optical axis direction, and the maximum aperture diameter of the shutter blade is adjusted according to the focal length of the taking lens. Has been proposed (see Patent Document 2).
[0005]
[Patent Document 1]
JP-A-3-107132 [Patent Document 2]
JP 2000-235209 A
[Problems to be solved by the invention]
However, the technologies proposed in Patent Documents 1 and 2 require an actuator for opening and closing the shutter blade and a dedicated lever for regulating the opening diameter of the shutter blade. Therefore, there is a problem that the cost increases. Further, since a dedicated lever for regulating the opening diameter of the shutter blade is provided, there is a problem that a relatively large space is required.
[0007]
The present invention has been made in view of the above circumstances, and has as its object to provide a camera in which cost is reduced and space is saved.
[0008]
[Means for Solving the Problems]
The camera of the present invention that achieves the above object is a camera that performs photographing by capturing subject light captured through a shutter that regulates the amount of light,
The shutter is
A shutter blade that can be opened and closed freely,
A drive member for driving the shutter blades, and a movement range limiting member for limiting a movement range of the drive member, wherein the shutter is moved by moving the drive member within a movement range limited by the movement range limitation member. An actuator for opening and closing the blades,
Further, the camera is provided with a maximum opening adjustment mechanism for adjusting the maximum opening diameter of the shutter blade by changing the movement range of the driving member by changing the attitude of the movement range limiting member. .
[0009]
The camera according to the present invention is provided with an actuator for opening and closing the shutter blade, a movement range limiting member for limiting a movement range of a driving member for driving the shutter blade, and changing the posture of the movement range limiting member to change the driving member. Since the maximum opening diameter of the shutter blade is adjusted by changing the moving range of the shutter, the configuration of the shutter is simplified. Therefore, for example, the cost and space can be reduced as compared with the technology including a plurality of actuators and a dedicated lever for regulating the opening diameter of the shutter blades proposed in Patent Documents 1 and 2.
[0010]
Here, it is preferable that the movement range limiting member is integrally fixed to the actuator main body, and the maximum opening adjustment mechanism changes the posture of the actuator main body.
[0011]
As described above, when the movement range limiting member is integrally fixed to the actuator main body to change the posture of the actuator main body, only one assembly member is required, so that further cost reduction and space saving can be achieved. .
[0012]
In addition, this camera includes a variable focal length shooting lens,
The maximum aperture adjustment mechanism receives the driving force that changes the focal length of the photographing lens to the telephoto side and the wide angle side, and moves the movement range limiting member so that the maximum aperture diameter of the shutter blades is relatively large. It is also a preferable embodiment that the posture is changed to a posture adjusted to a small opening diameter.
[0013]
With this configuration, a mechanism for adjusting the shutter blade to have a large opening diameter on the telephoto side and a small opening diameter on the wide angle side of the shutter blade can be realized with a relatively small number of components and a relatively small space.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0015]
FIG. 1 is an external perspective view of a first embodiment of the camera of the present invention as viewed obliquely from the front and above.
[0016]
A camera 1 illustrated in FIG. 1 is a camera that captures an image of a subject captured through a shutter that regulates a light amount. The camera 1 is a camera that incorporates an autofocus (AF) device generally called an active type and performs photography on a roll-shaped photo film. The autofocus device includes an AF light projecting window 12 disposed at the upper front of the camera 1, a light projecting unit that emits light for distance measurement from the AF light projecting window 12 toward the front of the camera 1, and a camera. 1 has an AF light receiving window 13 disposed at a predetermined distance from the AF light projecting window 12 on the front surface, and light emitted from the AF light projecting window 12 in front of the camera 1 and reflected by the subject and returned. Is received from the AF light receiving window 13 to receive the light, thereby obtaining a distance to the subject.
[0017]
At the center of the front surface of the camera 1, a zoom lens barrel 11 having an optical zoom lens 11a inside is provided.
[0018]
Further, the camera 1 is provided with a zoom finder window 14 constituting a zoom finder unit (not shown) and an AE light receiving window 15 for guiding light to a built-in AE sensor for exposure adjustment.
[0019]
Further, the camera 1 has a built-in red-eye reduction auxiliary light device that performs preliminary irradiation in order to prevent a red-eye phenomenon caused by insufficient illuminance around the subject, and is adjacent to the AF projection window 12. A red-eye lamp (LED) 16 that constitutes a spare light device for red-eye reduction is provided.
[0020]
Further, the camera 1 is provided with a flash light emitting unit 17 provided at a position adjacent to the red-eye lamp 16. The flash light emitting unit 17 emits flash light toward a subject at the time of shooting.
[0021]
A shutter button 18 is provided on the upper surface of the camera 1.
[0022]
FIG. 2 is an external perspective view of the camera of FIG.
[0023]
On the back of the camera 1, a power switch 21, a finder eyepiece window 22, a zoom operation lever 23 for operating the optical zoom lens 11a to the tele side (telephoto side) or the wide side (wide angle side), and necessary for operation. A liquid crystal monitor 24 for displaying information as a picture or the like is provided.
[0024]
FIG. 3 is a diagram showing a shutter provided in the camera shown in FIGS.
[0025]
The shutter 30 shown in FIG. 3 includes shutter blades 31 and 32 that can be freely opened and closed. The shutter 30 shown in FIG. 3 is in a state where the shutter blades 31 and 32 are closed.
[0026]
The shutter 30 has an actuator 33. The actuator 33 includes a driving member 33_1 for driving the shutter blades 31 and 32, a moving range restricting member 33_2 for restricting a moving range of the driving member 33_1, and a moving magnet type motor 33_3 which is an actuator body. I have. The driving member 33_1 is fixed to a driving unit of the motor 33_3 and is rotated. In addition, the movement range limiting member 33_2 has a protrusion 33_2a. The projection 33_2a engages with a cam groove, which will be described later, provided on the zoom lens barrel 11 of the camera 1, and performs an operation according to the shape of the cam groove. The movement range limiting member 33_2 is integrally fixed to the motor 33_3.
[0027]
Further, the shutter 30 is provided with a spring member 34 for urging the movement range limiting member 33_2 in a predetermined direction.
[0028]
FIG. 4 is a view showing the maximum opening diameter of the shutter shown in FIG. 3 on the wide side, and FIG. 5 is a view showing the shutter shown in FIG. 4 and cam grooves provided in the zoom lens barrel.
[0029]
As shown in FIG. 5, a cam groove 43a is provided in a rectilinear key ring 43 described later in the zoom lens barrel 11 of the camera 1. The projection 33_2a of the movement range restricting member 33_2 is engaged with a portion A on the wide side of the cam groove 43a. The cam groove 43a serves as a part of a maximum aperture adjustment mechanism that adjusts the maximum aperture diameter of the shutter blades 31, 32 by changing the movement range of the drive member 33_1 by changing the attitude of the movement range limiting member 33_2. It is. When the zoom lens barrel 11 of the camera 1 is on the wide side, as shown in FIG. 5, the projection 33_2a is located at a portion A on the wide side of the cam groove 43a, and as shown in FIG. The maximum opening diameter of the shutter blades 31 and 32 is relatively small.
[0030]
FIG. 6 is a diagram showing the maximum opening diameter of the shutter shown in FIG. 3 on the tele side, and FIG. 7 is a diagram showing the shutter shown in FIG. 6 and cam grooves provided in the zoom lens barrel.
[0031]
When the zoom lens barrel 11 moves from the wide side to the tele side, as shown in FIG. 7, the protrusion 33_2a also moves from the portion A on the wide side of the cam groove 43a to the portion B, and the cam groove 43a It moves to the part C on the tele side. Thereby, the protrusion 33_2a is rotationally moved in the direction T (direction orthogonal to the optical axis) shown in FIG. Therefore, the movement range limiting member 33_2 having the protrusion 33_2a also rotates in the T direction. Therefore, the attitude of the movement range restricting member 33_2 greatly changes upward in FIG. 7, and the movement range of the driving member 33_1 also changes greatly upward in FIG. 7, so that the maximum opening diameters of the shutter blades 31, 32 are relatively large. Large opening diameter is obtained.
[0032]
As described above, in the present embodiment, the moving member 33_1 that drives the shutter blades 31 and 32 is provided with the moving range restricting member 33_2 that restricts the moving range, and the driving member 33_2 is changed in posture to change the driving member 33_1. Since the maximum opening diameter of the shutter blades 31 and 32 is adjusted by changing the moving range of the shutter 33_1, a dedicated regulating lever for regulating the maximum opening diameter of the shutter blades 31 and 32 and the regulating lever are rotated. No actuator is needed to move it. Therefore, the cost and space can be reduced as compared with the technology provided with the plurality of actuators and the lever that regulates the opening diameter of the shutter blades proposed in Patent Documents 1 and 2 described above.
[0033]
FIG. 8 is a cross-sectional view of the camera shown in FIG. 1 showing a state in which the zoom lens barrel is housed in the camera body and is on the wide side.
[0034]
The zoom barrel 11 shown in FIG. 8 is connected to the rotatable barrel 41 via each cam mechanism, and moves in the optical axis direction relative to the rotatable barrel 41 as the rotatable barrel 41 rotates. A front group support frame 46 and a rear group support frame 48 that respectively hold the front group lens unit 45 and the rear group lens unit 47 are provided. Further, a spring member 49 is provided between the front lens unit 45 and the rear lens unit 47 to suppress play between the front lens unit 45 and the rear lens unit 47. Further, the above-described shutter 30 is provided above the front group support frame 46.
[0035]
A fixed barrel 42 is attached to the main body of the camera 1. An inner helicoid screw 42 a is formed on the inner surface of the fixed cylinder 42, and the rotatable cylinder 41 is fed out while rotating by meshing with the outer helicoid screw 41 a provided on the rotatable cylinder 41.
[0036]
The rectilinear key ring 43 is formed in a cylindrical shape along the inner wall surface of the rotary moving cylinder 41, and has a slit-shaped rectilinear key groove extending linearly in the optical axis direction through the inner wall surface and the outer wall surface. (Not shown) are formed. Further, the end portion 43b of the key plate of the linear key ring 43 is fitted into the fixed cylinder 42. Therefore, the linear key ring 43 moves straight with the rotary moving cylinder 41 in the optical axis direction, but moves around the optical axis. Is prevented from rotating. Further, the straight key ring 43 is provided with a cam groove 43a with which the above-mentioned projection 33_2a is engaged. Here, the protrusion 33_2a is engaged at the position of the portion A (see FIG. 5) on the wide side of the cam groove 43a. Further, a rectilinear moving cylinder 44 for supporting the front lens unit 45 and the shutter 30 is provided further inside the rectilinear key ring 43.
[0037]
The straight key (not shown) of the straight key ring 43 is engaged with the inner surface of the straight moving cylinder 44. For this reason, rotation of the rectilinear moving cylinder 44 around the optical axis is prevented, and the rectilinear moving cylinder 44 moves in the optical axis direction with the rotation of the rotary moving cylinder 41.
[0038]
Here, the zoom operation lever 23 is operated to the tele side. Then, a zoom operation toward the tele side (zoom-up operation) is performed.
[0039]
FIG. 9 is a cross-sectional view showing a state in which the zoom operation of the camera shown in FIG. 1 has been performed.
[0040]
In this zoom operation, the rotary moving cylinder 41 rotates around the optical axis, and a cam pin (not shown) moves in the optical axis direction (in FIG. 9) according to a predetermined path pattern of a cam groove 41 b provided in the rotary moving cylinder 41. Left). Then, the straight moving barrel 44 is extended in the optical axis direction. Further, the cam pins are also engaged with portions of the cam groove 41b formed on the inner wall surface of the rotary moving cylinder 41 having a different path pattern. Move in the axial direction. Thus, the zoom operation of the zoom lens barrel 11 is performed. Here, the protrusion 33_2a is engaged with the cam groove 43a at the position of the portion C (see FIG. 7) on the tele side. As described above, when the zoom lens barrel 11 of the camera 1 is on the wide side, the projection 33_2a is located on the wide side portion A of the cam groove 43a, and the maximum aperture diameter of the shutter blades 31, 32 is When the zoom lens barrel 11 moves from the wide side to the telephoto side, the projection 33_2a also moves to the telephoto side portion C of the cam groove 43a, and the shutter blades 31 and 32 The maximum opening diameter is relatively large.
[0041]
Note that, in the present embodiment, an example of a normal camera in which the shutter blades are closed in the standby state has been described. However, the present invention is not limited to this, and an electronic camera in which the shutter blades are open in the standby state. The present invention may be applied.
[0042]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a camera with reduced cost and space.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a first embodiment of a camera according to the present invention as viewed obliquely from the front and above.
FIG. 2 is an external perspective view of the camera of FIG.
FIG. 3 is a view showing a shutter provided in the camera shown in FIGS. 1 and 2;
FIG. 4 is a view showing a maximum opening diameter on the wide side of the shutter shown in FIG. 3;
FIG. 5 is a view showing a cam groove provided in the shutter and the zoom lens barrel shown in FIG. 4;
FIG. 6 is a view showing a maximum opening diameter on the tele side of the shutter shown in FIG. 3;
FIG. 7 is a view showing a cam groove provided in the shutter and the zoom lens barrel shown in FIG. 6;
8 is a cross-sectional view of the camera shown in FIG. 1, showing a state where the zoom lens barrel is housed in the camera body and is on the wide side.
FIG. 9 is a cross-sectional view showing a state in which the zoom operation of the camera shown in FIG. 1 is performed.
[Explanation of symbols]
1 Camera 11 Zoom lens barrel 11a Optical zoom lens 12 AF projection window 13 AF reception window 14 Zoom finder window 15 AE reception window 16 Red-eye lamp (LED)
17 Flash emission part 18 Shutter button 21 Power switch 22 Viewfinder eyepiece window 23 Zoom operation lever 24 Liquid crystal monitor part 30 Shutter 31, 32 Shutter blade 33 Actuator 33_1 Driving member 33_2 Moving range limiting member 33_2a Projection part 33_3 Motor 34, 49 Spring member 41 Rotating and moving cylinder 41a Helicoid outer screws 41b and 43a Cam groove 42 Fixed cylinder 42a Helicoid inner screw 43 Straight key ring 43b Key plate end 44 Straight moving cylinder 45 Front group lens unit 46 Front group support frame 47 Rear group lens unit 48 Rear group Support frame

Claims (3)

In a camera that shoots by capturing the subject light captured through a shutter that regulates the amount of light,
The shutter is
A shutter blade that can be opened and closed freely,
A drive member for driving the shutter blades, and a movement range limiting member for limiting a movement range of the drive member, wherein the shutter is moved by moving the drive member within a movement range limited by the movement range limitation member. An actuator for opening and closing the blades,
Further, the camera is provided with a maximum aperture adjusting mechanism for adjusting a maximum aperture diameter of the shutter blade by changing a movement range of the driving member by changing a posture of the movement range limiting member. camera. 2. The camera according to claim 1, wherein the movement range restricting member is integrally fixed to the actuator body, and the maximum aperture adjustment mechanism changes a posture of the actuator body. This camera has a variable focal length shooting lens,
The maximum aperture adjustment mechanism receives the driving force that changes the focal length of the photographing lens to the telephoto side and the wide angle side, and moves the movement range limiting member so that the maximum aperture diameter of the shutter blades is relatively large. 3. The camera according to claim 1, wherein the camera is changed to a posture adjusted to a small opening diameter.

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