JP3661229B2 - Anti-vibration camera - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an anti-vibration camera that moves the optical axis of an anti-vibration optical system to prevent camera shake, and more particularly, to an anti-vibration camera that electromagnetically drives the anti-vibration optical system.
[0002]
[Prior art]
Conventionally, as this type of anti-vibration camera, for example, the correction optical means is locked at a predetermined position or the lock means for releasing the lock state, and the retracted state of the barrel holding the optical system including the correction optical means is photographed. A configuration that is operated in conjunction with a movement operation between the preparation states is disclosed (Japanese Patent Laid-Open No. 5-100280, etc.).
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional vibration proof camera, since the vibration proof optical system cannot be locked unless it is retracted, it cannot be surely locked according to the shooting state. In addition, since a vibration-proof optical system cannot be locked unless a new actuator is used as a locking means, the structure becomes complicated, the size is increased, and the cost is increased.
[0004]
An object of the present invention is to provide a vibration proof camera capable of locking and unlocking a vibration proof optical system without providing a new actuator or the like and without performing a special operation.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention of claim 1 is a part of a photographing optical system, and a blur correction lens unit that corrects shake by changing an optical axis of the photographing optical system, and the blur correction lens unit. An anti-vibration camera that is arranged adjacent to and has a moving lens unit that is movable in the optical axis direction independently of the other lens groups, and the moving lens unit abuts against the blur correction lens unit Thus, a blur correction lens lock device for locking the blur correction lens unit is provided.
[0007]
A second aspect of the present invention, a vibration damping camera according to claim 1, wherein the moving lens unit, characterized in that it is a full Okasurenzu.
[0008]
According to a third aspect of the present invention, in the vibration-proof camera according to any one of the first to second aspects, the blur correction lens lock device locks in conjunction with the power switch being turned off. And
[0009]
According to a fourth aspect of the present invention, in the vibration-proof camera according to any one of the first to second aspects, the blur correction lens lock device locks in conjunction with a closing operation of the photographing lens barrier. It is characterized by.
[0010]
According to a fifth aspect of the present invention, in the vibration-proof camera according to any one of the first to second aspects, the shake correction lens lock device locks in conjunction with the end of the shutter release operation. Features.
[0011]
According to a sixth aspect of the present invention, in the vibration-proof camera according to any one of the first to second aspects, the shake correction lens lock device locks in conjunction with a return operation of the focus lens. Features.
[0012]
According to a seventh aspect of the present invention, in the vibration-proof camera according to any one of the first to sixth aspects, the shake correction lens lock device returns the shake correction lens unit to the vibration-proof reference position before locking. It is characterized by that.
[0013]
According to an eighth aspect of the present invention, in the vibration proof camera according to any one of the first to seventh aspects, the shake correction lens lock device is configured such that the moving lens portion and the shake correction lens portion are in contact with each other. To the lens retracting position.
[0014]
According to a ninth aspect of the present invention, in the vibration proof camera according to any one of the first to seventh aspects, the shake correction lens lock device is configured such that the movable lens portion and the shake correction lens portion are in contact with each other. And returning to the lens retracted position.
[0015]
According to a tenth aspect of the present invention, in the vibration proof camera according to any one of the first to seventh aspects, the shake correction lens lock device is configured such that the moving lens portion and the shake correction lens portion are in a lens retracted position. It is characterized by contacting after returning to step (b).
[0016]
According to an eleventh aspect of the present invention, in the vibration proof camera according to any one of the first to tenth aspects, the shake correction lens lock device performs unlocking in conjunction with the power switch being turned on. Features. According to a twelfth aspect of the present invention, in the vibration-proof camera according to any one of the first to tenth aspects, the shake correction lens lock device releases the lock in conjunction with the opening operation of the photographing lens barrier. It is characterized by that.
[0017]
According to a thirteenth aspect of the present invention, in the vibration-proof camera according to any one of the first to tenth aspects, the blur correction lens lock device releases the lock in conjunction with an operation for starting shooting preparation. It is characterized by.
[0018]
According to a fourteenth aspect of the present invention, in the vibration-proof camera according to any one of the first to tenth aspects, the blur correction lens lock device releases the lock in conjunction with a shutter release operation. And According to a fifteenth aspect of the present invention, in the vibration-proof camera according to any one of the first to fourteenth aspects, the shake correction lens lock device releases the lock while maintaining the lock position. To do.
[0019]
[Action]
In the present invention, the movable lens such as the focus lens is moved and brought into contact with the blur correction lens so that the blur correction lens is locked so as not to move. In addition, there is no need to provide a new actuator.
[0020]
【Example】
(First embodiment)
Hereinafter, the present invention will be described in more detail with reference to the drawings.
1 and 2 are side cross-sectional views showing a lens barrel-integrated camera (zoom camera) to which a first embodiment of a vibration-proof camera according to the present invention is applied. FIG. 1 is a non-photographing state of the camera. 2 shows a state in which the lens barrel is retracted and the shake correction lens is locked, and FIG. 2 shows a state in which the camera is turned on and the lens barrel is extended to the shooting state and the shake correction lens is unlocked. FIG.
[0021]
A fixed barrel 2 is fixed to the camera body 1, and rectilinear grooves 2 a and 2 b in the optical axis direction are formed on the peripheral surface of the fixed barrel 2. A cam barrel 3 is rotatably inserted into the outer peripheral surface of the fixed barrel 2 and is prevented from being detached by a ring 4. A gear portion 3d is formed on the outer peripheral surface of the cam barrel 3, and the rotation of the zoom motor 77 (FIG. 4) is transmitted to the gear portion 3d via the gear GR. Rotates. Cam grooves 3 a, 3 b, 3 c are formed on the peripheral surface of the cam cylinder 3.
[0022]
A lens barrel 45 for holding the front lens group L1 is inserted on the inner peripheral surface side of the fixed lens barrel 2, and a cam follower 45a implanted in the outer peripheral surface penetrates the rectilinear groove 2a to form a cam groove 3a. Is engaged. A pair of barriers 46 for protecting the photographing lens are provided in the front part of the lens barrel 45, and the barriers 46 are opened and closed by an operating lever 47.
In this embodiment, the barrier 46 is manually opened and closed by operating the operating lever 47 as described above. However, the present invention is not limited to this, and the barrier 46 is automatically opened (by a barrier drive mechanism (not shown) including a motor) in response to turning on of a power switch SW5 described later, and the switch The barrier 46 may be closed automatically (by the barrier driving mechanism) in response to the SW5 being turned off.
[0023]
A second group lens frame 5 is inserted on the inner peripheral surface side of the fixed lens barrel 2. The second group lens frame 5 includes a shake correction lens L3 and a driving device for driving the shake correction lens L3. The shutter 42 and the lens L2 fixed in the shutter 42 are held.
[0024]
As shown in FIG. 3, the lens frame 6 holds a shake correction lens L3 of a shake correction lens driving mechanism. Guide lenses 7a and 7b for guiding in the Y direction are fixed to the lens frame 6, and are attached to holes 60a and 60b of the X stage 60 so as to be freely movable in the direction of the guide axis. Magnets 8a and 8b are attached to the outer periphery of the guide shafts 7a and 7b, and the coils 9a and 9b are fixed to the X stage 60 so as to surround the outer periphery.
[0025]
Guide shafts 61a and 61b for guiding in the X-axis direction are fixed to the stage 60, and are attached to the holes 5d and 5e of the second group lens frame 5 so as to be freely movable in the guide axis direction. Magnets 62a and 62b are attached to the outer periphery of the guide shafts 61a and 61b, and the coils 63a and 63b are fixed to the second group lens frame 5 so as to surround the outer periphery.
[0026]
FIG. 4 is a cross-sectional view showing a shake correction mechanism of the vibration proof camera according to the present embodiment.
Between the lens frame 6 and the second group lens frame 5, ropes 64a to 64c (see FIG. 3) are provided, and the lens frame 6 is pressed against the second group lens frame 5 by a tension spring 65. An LED 66 and a lens 67 are fixed to the second group lens frame 5, and a point light source image is formed on the PSD element 68 on the lens frame 6, and the movement amount of the lens frame 6 can be detected. Thus, a correction lens position detector 23 (see FIG. 5) of the blur correction lens L3 is configured.
[0027]
By energizing the coils 9a and 9b, the blur correction lens L3 is driven in the Y direction, and based on the position signal from the correction lens position detector 23, the energization to the coils 9a and 9b is controlled, and the blur correction lens L3. Is driven to a predetermined position. The blur correction lens L3 is similarly driven in the X direction by energizing the coils 63a and 63b.
Accordingly, when the camera is not used, the coils 9a, 9b, 63a, and 63b are not energized. Therefore, there is no restriction in the direction perpendicular to the optical axis of the vibration reduction lens L3, and if an external force is applied, there is a possibility of colliding with mechanical limitations and causing destruction There is.
[0028]
Further, as shown in FIG. 1, a lens shutter mechanism 40 is integrally attached to the second group lens frame 5. In the lens shutter mechanism 40, a shutter blade 41 serving also as an aperture and a drive unit 42 that drives the shutter blade 41 are integrated, and the drive unit 42 is screwed to the substrate 51-1 with a screw 43. The drive unit 42 is mounted with an electrical component 42 a such as a motor for driving the shutter blades 41. A lens L <b> 2 is held on the inner peripheral surface side of the second group lens frame 5. Here, the cam follower 51-1a implanted in the substrate 51-1 passes through the rectilinear groove 2b and is engaged with the cam groove 3b.
[0029]
The lens substrate 51 is inserted on the rear side of the fixed lens barrel 2, a helicoid screw 51a is formed on the inner peripheral surface thereof, and a cam follower 51b is implanted on the outer peripheral surface thereof. The cam follower 51b passes through the rectilinear groove 2b and is engaged with the cam groove 3c. The lens holder 52 is a member that holds the focusing lens L4, and a helicoid 52a is formed on the outer peripheral surface thereof. The helicoid 52 a meshes with the helicoid 51 a of the lens substrate 51.
A compression spring 59 is inserted between the lens holder 52 and the lens substrate 51, and the play of the helicoids 52a and 51a is brought close to one direction.
[0030]
The focusing motor 53 is integrally provided with a gear 53a on its output shaft, and the gear 53a meshes with the helicoid 51a. The lens holder 52 is rotated by the rotation of the motor 53. When the lens holder 52 rotates, the lens holder 52, that is, the focusing lens L4 moves in the optical axis direction by the action of the helicoids 51a and 52a, and thereby focusing is performed.
[0031]
The focusing lens L4 is formed with a lock portion L4a on the front, and the lock portion L4a locks the shake correction lens L3 by contacting the end portion 6a of the lens holder 6 of the shake correction lens L3.
At this time, if the focusing lens L4 and the vibration reduction lens L3 are brought into contact with each other and then returned to the lens retracted position, the locking time can be reliably locked long. Further, if the lens is retracted while coming into contact, the sequence for locking becomes shorter. Furthermore, if the lens is brought into contact after returning to the lens retracted position, the stroke can be reduced.
[0032]
FIG. 5 is a block diagram illustrating a control circuit of the image stabilization camera according to the present embodiment.
The control IC 71 is connected to a photometry circuit 81, a distance measurement circuit 82, a camera shake sensor 83 that detects a camera shake amount due to camera shake, and the like.
[0033]
The control IC 71 is connected to an electrical component 42 a for driving the shutter via a shutter driver 73. Further, coils 9a, 9b, 61a and 61b in the X and Y directions are connected via a camera shake correction coil driver 74, and a correction lens detector in the X and Y directions via a camera shake correction lens position detection circuit 75. 23 (PSDs 68X and 68Y, LEDs 66X and 66Y) are connected to each other.
Based on the output of the correction lens detector 23, the camera shake correction lens position detection circuit 75 detects the amount and direction of movement of the shake correction lens L3 and inputs the detected amount to the control IC 71.
[0034]
Further, a focusing motor 53 is connected to the control IC 71 via a focusing motor driver 76, and a zoom motor 77 is connected via a zoom motor driver 72.
[0035]
On the other hand, the control IC 71 is connected to a half-press switch SW1 that is turned on by a half-press operation of the release button, a release switch SW2 that is turned on by a full-press operation of the release button, and zooming switches SW3 and SW4.
The control IC 71 operates the photometry circuit 81 and the distance measurement circuit 82 as the half-push switch SW1 is turned on, and moves the focusing lens L4 in the optical axis direction based on the detection output of the distance measurement circuit 82. Perform focusing. Further, when the full-press switch SW2 is turned on, the shutter driving electric component 42a is driven and controlled based on the output of the photometry circuit 81, and the shutter blade 41 is opened and closed. Further, during the shutter release, the control IC 71 drives and controls the magnets 9a, 9b, 61a, 61b in the X and Y directions based on the output of the camera shake sensor 83 and the output of the camera shake correction lens position detection circuit 75. The blur correction lens L3 is appropriately moved in a direction perpendicular to the optical axis to prevent image blur due to camera shake.
[0036]
When the zooming switches SW3 and SW4 are turned on, the control IC 71 drives the zoom motor 77 and rotates the cam cylinder 3 via the gear GR. As the cam barrel 3 rotates, the cam grooves 3a, 3b, 3c move, so that the lens barrel 45 and the lens substrates 51-1, 51 are moved in the optical axis direction via the cam followers 45a, 5a, 51b. It is driven, and each lens L1-L4 is zoomed to a predetermined position.
[0037]
Further, the control IC 71 is provided with a power switch SW5 for starting the camera and a barrier switch SW6 for detecting the closed state of the lens barrier 46. When the power switch SW5 is turned off or the barrier switch SW6 is turned on, the control IC 71 drives the focusing motor 53 to move the focusing lens L4 forward, and the lock portion L4a is the lens holder 6 of the blur correction lens L3. The movement of the blur correction lens L3 is locked.
In order to simplify the explanation, in the flowcharts (FIGS. 6 and 8) to be described later, only the operation when the power switch SW5 is turned off will be described, and when the barrier 46 is opened (when the barrier switch SW6 is turned on). The description of the operation is omitted. The operation when the barrier 46 is closed (when the barrier switch SW6 is OFF) may be considered by replacing the description of the power switch SW5 in the flowchart with the barrier switch SW6.
[0038]
6 and 7 are flowcharts for explaining the operation of the first embodiment of the image stabilization camera according to the present invention.
In the first embodiment, the shake correction lens L3 is locked when the zoom lens barrel is retracted (state shown in FIG. 1), and the lock of the shake correction lens L3 is released when driving the W end (state shown in FIG. 2).
When the power switch MSW is turned on in S102, the process proceeds to S103, a battery check (BC) is performed, and if the voltage is sufficient, the process proceeds to S104.
[0039]
In S104, centering drive of the blur correction lens L3 is performed. This is because the shake correction lens L3 is held at the center position so that the shake correction lens L3 does not fall in the direction of gravity when the shake correction lens L3 is extended and released from the locked state. .
[0040]
In S105, the photographic lens barrel is driven to the W end. That is, the photographic lens barrel is extended so as to release the shake correction lens L3 from the locked state. When starting to extend to the W end position, the distance between the blur correction lens L3 and the focusing lens L4 is increased, and the blur correction lens L3 fitted to the lens frame 52 of the focusing lens L4 is moved out and released from the locked state. (See FIG. 2).
[0041]
In step S106, when the driving of the photographing lens barrel to the W end is completed, the driving of the blur correction lens L3 is stopped. That is, when the centering driving operation is stopped, the shake correction lens L3 stops at the mechanical limit position in the gravity direction.
[0042]
In S107, the state of the main switch (SW5) is determined. If the on state is maintained, the process proceeds to S108, and it is determined whether the half-press switch SW1 is on or off. If the half-press switch SW1 is on, the process proceeds to S109, and if it is off, the process returns to S108.
In step S109, the camera shake sensor 83 is activated. In step S110, photometry and distance measurement are performed, and in step S111, the focusing lens is driven based on the distance measurement result to perform a focusing operation.
[0043]
In S112, it is determined whether the shutter release switch full-press switch SW2 is on or off. If the full push switch SW2 is off, the process proceeds to S113, and the state of the half push switch SW1 is determined. In S113, if the half-push switch SW1 is on, the process proceeds to S114. If it is off, the process returns to S108.
[0044]
In S114, it is determined whether or not the camera shake amount detected by the camera shake sensor 83 is equal to or less than the predetermined value A. If the camera shake amount is equal to or less than the predetermined value A, the process proceeds to S115, the shake display lamp is turned on and is greater than the predetermined value. In such a case, the process proceeds to S116, the blur display lamp blinks, and the process returns to S112.
[0045]
If the main switch SW5 is OFF in S107, the process proceeds to S117, and first, the centering drive of the blur correction lens L3 is performed in order to bring the blur correction lens L3 into a locked state. When the blur correction lens moves to the center position, the photographing lens barrel is reset (S118), and retracted to cause the focusing lens L4 to engage and lock the blur correction lens L3 (see FIG. 1). . When the reset driving of the taking lens barrel is completed, the centering driving operation of the blur correction lens is stopped (S119), and the operation is ended (S127).
[0046]
In S112, when the full-press switch SW2 is turned on, after the blur display lamp is turned off (S120), the blur correction unit is centered (S121). Next, shake correction driving is started (S122), exposure is started (S123), and the shake correction lens L3 is driven based on the detection signal from the camera shake sensor 83 only while the shutter is open.
In S124, based on the exposure calculation result, the shutter is closed to end the exposure operation. Further, the blur correction driving is stopped (S125), the film is wound up by one frame (S126), and the process returns to S107.
[0047]
As described above, according to the present embodiment, the focusing lens L4 that moves in the optical axis direction during focusing is moved forward in the optical axis direction, and the lock portion L4a is moved to the end 6a of the lens holder 6 of the shake correction lens L3. Since the operation of the shake correction lens L3 is locked by the contact, the shake correction lens L3 can be locked without using a new actuator.
Furthermore, when the focusing lens L4 is in contact with the end 6a of the lens holder 6, it can be pressed with an appropriate force by the action of the compression spring 59.
In addition, since the shake correction lens L3 is locked in conjunction with the movement of the taking lens barrel, it is possible to prevent the shake correction lens L3 from being moved by an external force or the like when the camera is not used and damaging the vibration isolation mechanism. .
[0048]
(Second embodiment)
FIG. 8 is a side sectional view showing a locked state at the time of focusing return of a lens barrel-integrated camera (zoom camera) to which a second embodiment of the image stabilization camera according to the present invention is applied.
9 and 10 are flowcharts for explaining the operation of the second embodiment of the image stabilization camera according to the present invention.
In the following embodiments, the same reference numerals are given to the portions that perform the same functions as in the first embodiment, and overlapping drawings and descriptions thereof will be omitted as appropriate.
In the second embodiment, the blur correction lens L3 is unlocked (see the state of FIG. 2) during the focusing operation, and the blur correction lens L3 is locked (see the state of FIG. 1) during the focusing return.
That is, after centering the shake correction lens L3 in S1101, focusing is performed in S111 to unlock the shake correction lens L3.
[0049]
On the other hand, if the half-push switch SW1 is turned off in S113, a focusing return is performed in S1131, the shake correction lens L3 is locked, and then the drive of the shake correction lens L3 is turned off in S1132.
[0050]
When the exposure ends in S124, a focusing return is performed in S1241, the blur correction lens L3 is centered, and after the blur correction lens L3 is locked, the drive of the blur correction lens L3 is turned off in S125.
[0054]
(Other examples)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also included in the present invention.
For example, a focusing lens is taken as an example of a moving lens that locks a blur correction lens, but a zoom lens may be used.
Further, the shake correction lens may be locked and unlocked in conjunction with the power switch SW5 and the lens barrier switch SW6.
[0055]
【The invention's effect】
As described above in detail, according to the present invention, the movable lens such as the focus lens is moved and brought into contact with the blur correction lens so that the blur correction lens is locked so as not to move. It can be reliably locked according to the shooting state, and there is no need to provide a new actuator.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a locked state in a non-photographing state (when a lens is retracted) of a lens barrel-integrated camera (zoom camera) to which a first embodiment of an image stabilization camera according to the present invention is applied.
FIG. 2 is a side cross-sectional view showing an unlocked state of a lens barrel-integrated camera (zoom camera) to which the first embodiment of the image stabilization camera according to the present invention is applied.
FIG. 3 is a diagram illustrating details of a camera shake correction device for an image stabilization camera according to a first embodiment.
FIG. 4 is a diagram illustrating details of a camera shake correction device for an image stabilization camera according to a first embodiment.
FIG. 5 is a block diagram illustrating a configuration of a control system of the image stabilization camera according to the first embodiment.
FIG. 6 is a flowchart for explaining the operation of the image stabilization camera according to the first embodiment;
FIG. 7 is a flowchart for explaining the operation of the image stabilization camera according to the first embodiment;
FIG. 8 is a side sectional view showing a locked state at the time of focusing lock of a lens barrel-integrated camera (zoom camera) to which a second embodiment of the image stabilization camera according to the present invention is applied.
FIG. 9 is a flowchart for explaining the operation of the image stabilization camera according to the second embodiment;
FIG. 10 is a flowchart for explaining the operation of the image stabilization camera according to the second embodiment;
[Explanation of symbols]
L3 Blur correction lens L4 Focusing lens L4a Lock part 6 Lens holder 6a End

Claims (15)

A blur correction lens unit that is part of the photographic optical system and corrects shake by changing the optical axis of the photographic optical system;
An anti-vibration camera that is disposed adjacent to the blur correction lens unit and has a moving lens unit that can move in the optical axis direction independently of other lens groups ,
An anti-vibration camera comprising a shake correction lens lock device that locks the shake correction lens portion by bringing the movable lens portion into contact with the shake correction lens portion. The vibration-proof camera according to claim 1 ,
The moving lens unit, antivibration camera, which is a full Okasurenzu. In the anti-vibration camera according to any one of claims 1 to 2 ,
The anti-vibration camera characterized in that the blur correction lens lock device locks in conjunction with the power switch being turned off. In the anti-vibration camera according to any one of claims 1 to 2 ,
The anti-vibration camera characterized in that the blur correction lens lock device locks in conjunction with the closing operation of the photographing lens barrier. In the anti-vibration camera according to any one of claims 1 to 2 ,
The vibration-proof camera is characterized in that the blur correction lens lock device locks in conjunction with the end of the shutter release operation. In the anti-vibration camera according to any one of claims 1 to 2 ,
The anti-vibration camera characterized in that the blur correction lens lock device locks in conjunction with the return operation of the focus lens. The vibration-proof camera according to any one of claims 1 to 6 ,
The anti-shake camera, wherein the anti-shake lens lock device returns the anti-shake lens unit to an anti-shake reference position before locking. The anti-vibration camera according to any one of claims 1 to 7 ,
The anti-shake camera, wherein the shake correction lens lock device returns to the lens retracted position after the movable lens portion and the shake correction lens portion are in contact with each other. The anti-vibration camera according to any one of claims 1 to 7 ,
The vibration-proof camera is characterized in that the shake correction lens lock device returns to the lens retracted position while the moving lens portion and the shake correction lens portion are in contact with each other. The anti-vibration camera according to any one of claims 1 to 7 ,
The anti-shake camera is characterized in that the shake correction lens lock device abuts after the movable lens portion and the shake correction lens portion return to the lens retracted position. The vibration-proof camera according to any one of claims 1 to 10 ,
The anti-vibration camera is characterized in that the blur correction lens lock device releases the lock in conjunction with the power switch being turned on. The vibration-proof camera according to any one of claims 1 to 10 ,
The anti-vibration camera is characterized in that the blur correction lens lock device releases the lock in conjunction with the opening operation of the photographing lens barrier. The vibration-proof camera according to any one of claims 1 to 10 ,
The anti-shake camera is characterized in that the blur correction lens lock device releases the lock in conjunction with an operation for starting shooting preparation. The vibration-proof camera according to any one of claims 1 to 10 ,
The anti-vibration camera characterized in that the blur correction lens lock device releases the lock in conjunction with a shutter release operation. The vibration-proof camera according to any one of claims 1 to 14 ,
The anti-vibration camera characterized in that the blur correction lens lock device releases the lock while maintaining the lock position.

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