JPH0876164A - Image plane shake correction device - Google Patents

Abstract

PURPOSE: To prevent a variable apex-angle prism or the driving means thereof from being damaged. CONSTITUTION: The frame 30 of the device is provided with a lock plate 66 locking lock pins 61 and 62 and stopping the movement of the variable apex- angle prism so that it is pressed in a locking direction. Besides, it is provided with an interlocking lever 70 made to abut on the front lens barrel part 81 of a photographing lens 80, turned around a shaft 69 as the center and moved in a direction that the lock of the plate 66 is released by resisting to pressing force. When the device is fitted to the lens 80, the lever 70 is made to abut on the lens barrel part 81 and turned. By interlocking with it, the plate 66 is moved in the direction that the lock is released. Then, the lock of the pins 61 and 62 is released. Besides, when the device is detached from the lens 80, the plate 66 is moved in the pressing direction so as to lock the pins 61 and 62 because the lever 70 is separated from the lens barrel part 81.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in an image pickup apparatus such as a television camera or a video camera, and when image pickup apparatus is subjected to disturbance vibration, it is possible to obtain a stable image without image shake. It relates to the device.

[0002]

2. Description of the Related Art In recent years, image pickup apparatuses such as television cameras and video cameras have become more automated, and a technique for realizing a shake correction function for automatically correcting image shake caused by shake of the entire apparatus has been put into practical use. These shake correction devices generally include a detection unit that detects a shake of the entire device, a shake correction unit that corrects image shake, a drive unit that drives this shake correction unit, and a shake correction unit according to the output of the shake detection unit. It is composed of control means for calculating the amount and controlling the drive of the drive means, and lock means for locking the drive means.

The driving means is composed of pitch driving means for correcting and driving the shake in the pitch direction and yaw driving means for correcting and driving the shake in the yaw direction. As shake detecting means, there is an angular velocity meter or the like, and the shake correcting means. There is a variable apex angle prism which is arranged in the photographing optical path of the photographing lens and tilts the imaging optical path by the relative tilt of a pair of transparent plates with a transparent liquid interposed therebetween to correct the shake of the screen. The screen shake correction device is usually provided inside the lens barrel of the taking lens, but there are some that can be removed from the taking lens.

[0004] This removable type may have a large screen shake correction device suitable for a high magnification photographing lens for an image pickup device such as a television camera, which may impair the mobility of the photographer. When screen shake correction such as on-vehicle or helicopter shooting is required, use the screen shake correction device attached to the shooting lens, and when mobility on shoulder or next shooting, that is, handheld shooting is prioritized,
The screen shake correction device is detached so that it is possible to take a picture, and the structure is as shown in FIG.

That is, the two transparent plates 1 and 2 made of glass plates or the like have the outer peripheral frames 3 and 4 and the bellows-shaped film 5.
And a liquid having a high refractive index is filled in the sealed space, and these constitute the variable apex angle prism 6.

A flat coil 7 is fixed to one end of the frame body 3, and permanent magnets 8 and yokes 9 and 10 facing each other with the coil 7 sandwiched therebetween are arranged on both sides of the frame body 3. The driving means 11 is constituted. Also, the frame 3
Is provided with an arm 13 having a slit 12, and a light emitting element 14 and a light receiving element 15 are arranged to face each other on both sides of the arm 13 so that a light beam emitted from the light emitting element 14 is slit 12. After passing through, the light receiving element 15 is irradiated. Here, the light emitting element 14 is an infrared light emitting element that emits infrared light such as IRED, and the light receiving element 15 is a photoelectric conversion element such as PSD whose output changes depending on the spot position of the received light beam. .

Further, the frame 4 is also provided with an arm 17 having a slit 16, and although not shown, a flat coil similar to that on the frame 3 side, a permanent magnet, a yoke, a light emitting element, a light receiving element. Are arranged.

A shake detector 18, 1 as shake detecting means is provided on the supporting portion of the apparatus in the pitch direction P and the yaw direction Y.
9 is attached so as to detect the shake amount in the pitch direction P and the yaw direction Y of the entire apparatus, and the A / D converter, D
A / A converter, a CPU, a memory, etc., and a control circuit 20 as a control means for inputting the detection signals of the shake detectors 18 and 19 and controlling the system, and the frame 3 side in accordance with a command from the control circuit 20. A coil drive circuit 21 that supplies current to the coil 7 and the coil on the frame 4 side is provided.

The frame bodies 3 and 4 are supported on a frame (not shown) by a pitch axis P and a yaw axis Y, and a lock pin 24 protruding outward in the pitch axis direction P is fixed to the outer peripheral surface of one frame body 4. Has been done. Further, a lock knob 25 provided with a V-shaped recess for receiving the lock pin 24 on the frame
And a limit switch 26 for detecting the operating position of the lock knob 25. Although not shown, in order to lock the frame body 3 centered in the yaw axis direction Y at the neutral position,
A lock pin 24, a lock knob 25, and a limit switch 26 are arranged respectively.

In the screen shake preventing device having such a structure, when shake occurs in the entire device due to shake of a hand holding the whole device, disturbance vibration, etc., shake detectors 18 and 19 detect the shake. The signal is input to the control circuit 20, and the apex angle of the variable apex angle prism 6 required for removing the shake is calculated.

On the other hand, the rotation angles of the transparent plates 1 and 2 facing each other about the axes P and Y, that is, the pitch of the variable apex angle prism 6 and the apex angle in the yaw direction are changed by the light flux emitted from the light emitting element 14. Frames 3 and 4 that rotate integrally with the transparent plates 1 and 2 facing each other
When the light passes through the slits 12 and 16 provided in the arms 13 and 17 and enters the light receiving element 15, the spot position on the light receiving surface fluctuates. The light receiving element 15 transmits to the control circuit 20 an output according to the amount of movement of the spot, that is, the size of the apex angle of the variable apex angle prism 6. This control circuit 2
0 calculates the difference between the size of the calculated apex angle and the size of the apex angle at the present time, and transmits it to the coil drive circuit 21. The coil drive circuit 21 supplies a drive current according to the coil drive command signal to the coil 8.

The variable apex angle prism 6 is rotated about the axes X and Y by the coil 8 and is deformed so as to match the magnitude of the apex angle calculated above. That is, the variable apex angle prism 6 performs the correction control of the shake by the feedback control in which the value of the apex angle calculated to correct the shake is used as the reference signal and the current value of the apex angle is used as the feedback signal. There is.

When the shake correction is not performed, the lock knob 25 is moved upward and the lock pin 24 is sandwiched in the recess at the upper end thereof. Then, the frame body 4 cannot rotate with respect to the yaw axis Y and is locked in the yaw direction. On the other hand, when the lock knob 25 rises to the lock position, the limit switch 26 operates and is transmitted to the coil drive circuit 21, and in response to this, the energization of the coil of the frame body 4 is stopped. Although not shown in the figure, the pitch direction P is similarly locked. In addition, in addition to this, when the operation of the camera is in a standby state, there is also a system in which in response to this state, the lock knob 25 is electrically raised to the lock position to stop the shake correction.

[0014]

However, the above-mentioned conventional example is generally used for a large-scale photographing lens for an image pickup apparatus such as a television camera, particularly a high-magnification photographing lens. The variable apex angle prism to be arranged at must be large in size in consideration of the effective light flux of the lens. Accordingly, the driving means for variably tilting the transparent plate of the variable apex angle prism is also increased in size, resulting in an increase in size of the screen shake correction device, an increase in size of the taking lens, and an increase in weight.

For this reason, when the photographer prioritizes screen shake correction such as shooting on a vehicle or on a helicopter, the shooting lens is equipped with a screen shake correcting device, and priority is given to maneuverability such as handheld shooting. In this case, the image blur correction device is detached from the taking lens and each image is taken. When the photographer wants to stop the shake correction, the shake correction is stopped using the lock lever of the screen shake correction device, command information from the standby state of the camera, and the like.

However, the photographer may instantaneously remove the screen shake compensating device from the photographing lens to enhance the maneuverability for photographing. At this time, if there is not enough time, the screen shake correction device may be removed from the taking lens without stopping the shake correction by the lock lever of the screen shake correction device. For this reason, in the screen shake correction apparatus, when the shake correction is not stopped, that is, when the drive means for driving the variable apex angle prism is not locked, the drive means and the drive means are There is a problem that the variable apex angle prism is damaged due to impact.

The object of the present invention is to solve the above problems,
It is an object of the present invention to provide a screen shake preventing device in which the variable apex angle prism and its driving means are not damaged.

[0018]

A screen shake correcting apparatus according to a first aspect of the present invention for achieving the above object is a shake detecting means for detecting shake of the whole apparatus, and a transparent liquid arranged in a photographing optical path of a photographing lens. A variable apex angle prism that tilts the imaging optical path by a relative tilt of a pair of transparent plates interposed therebetween to correct the shake of the screen, and a driving unit that relatively tilts the pair of transparent plates to correct the shake. And a control means for driving and controlling the drive means, wherein the screen shake correction device is detachable from the photographing lens, and a lock for locking the drive means in conjunction with the movement of the removal from the photographing lens. It is characterized by having means.

Further, the screen shake preventing apparatus according to the second aspect of the present invention includes a shake detecting means for detecting shake of the entire apparatus and a pair of transparent plates disposed in the photographing optical path of the photographing lens and having a transparent liquid interposed therebetween. Variable apex angle prism that tilts the image pickup optical path by a positive tilt to correct the shake of the screen, and drive means that relatively tilts the pair of transparent plates to correct the shake.
A screen shake correction apparatus which has a control means for driving and controlling the drive means and which can be detached from the photographing lens, wherein the drive means is locked in association with the movement of the detachment from the photographing lens. It is characterized by having a locking means and a second locking means for locking the driving means in a state of being attached to the taking lens.

[0020]

In the screen shake correcting apparatus according to the first aspect of the present invention having the above-mentioned structure, when the apparatus is detached, the lock means interlocks with the movement thereof to automatically lock the drive means for driving the variable apex angle prism.

The screen shake preventing apparatus according to the second aspect of the present invention locks the drive means for driving the variable apex angle prism by locking the apparatus with the apparatus attached.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is a block diagram of the first embodiment. The frame 30 of the apparatus is in the shape of an open rectangular box, a mounting hole (not shown) for mounting a photographing lens is provided in the center of the portion corresponding to the bottom surface, and a circular variable apex angle prism 31 is provided in substantially the center of the frame 30. Are provided parallel to the mounting hole surface.

As shown in FIG. 2, the variable apex angle prism 31 has two transparent front and rear circular plates 32 and 33 which are sealed at their outer peripheries with a bellows-like film 34, and the sealed space has a high refractive index. The film 34 is formed into a bellows shape of 2 to 3 steps, and the variable apex angle prism 31 is inclined in an arbitrary direction to have an apex angle.

As shown in FIG. 1, the frame body 36 is supported by the frame 30 by a diametrical yaw shaft 35 provided on the outer circumference thereof, and a diametrical pitch shaft 37 provided on the outer circumference and orthogonal to the yaw shaft 35. The frame 38 is supported by the frame 30, the variable apex angle prism 31 is held by the frame 36 on the transparent plate 32 side, and the transparent plate 33 side is held by the frame 38, and the transparent plates 32, 33 are yawed. It is rotatable about the shaft 35 and the pitch shaft 37.

A flat coil 39 is fixed to the frame body 36 at the tip of an arm extending in a direction parallel to the yaw axis 35, and the coil 39 is sandwiched on both sides of the coil 39. Then, the permanent magnet 40 and the yokes 41 and 42 facing each other are arranged, and the driving means 43 by the closed magnetic circuit is configured. Further, an arm 45 having a slit 44 is provided at the tip of the arm portion on the opposite side of the flat coil 39, and a light emitting element 46 and a light receiving element 47 are arranged facing each other on both sides of the arm 45.

The other frame 38 has the same coil 48, permanent magnet 49, and yoke 5 as those provided on the frame 36.
The driving means 52 is constituted by a closed magnetic circuit of 0 and 51, and an arm 54 having a slit 53, a light emitting element 55, and a light receiving element 56 are arranged.

In the frame 30, a shake detector 57 as shake detecting means in the pitch direction P and the yaw direction Y,
Reference numeral 58 is attached so that the amount of camera shake in the pitch direction and the yaw direction of the entire device can be detected. In addition, it is composed of an A / D converter, a D / A converter, a CPU, a memory, etc.,
A control circuit 59 for inputting the detection signals of the shake detectors 57, 58 and controlling the system, and a coil drive circuit 60 for supplying a current to the coils 39, 48 in accordance with a command from the control circuit 59 are attached.

Support arms are provided on the outer peripheral surfaces of the frame bodies 36 and 38 so as to project in the same direction and have their tips bent at right angles and parallel to each other, and lock pins 61 and 62 are attached to the tips thereof. Further, as shown in FIG. 3, the frame 30 is provided with a support base 63 having regulation edges 63a on both sides in a direction orthogonal to the lock pins 61, 62, and cutout portions 64, 65 having V-shaped portions on the upper side are connected in series. Lock plate 66
Is supported on the support base 63 slidably in the directions of the arrows c and d by being guided by the regulation edges 63a on both sides, and the cutout portion 64,
Lock pins 61 and 62 are inserted in 65, respectively. One end of the lock plate 66 is biased in the direction of arrow c by a tension spring 67 attached to a protrusion of the frame 30, and a switching pin 68 is provided at a portion that bulges to the right of the cutout portion 65 in the biasing direction. It is provided in a direction parallel to 62.

On the other hand, an interlocking lever extending from the shaft 69 that is erected in the frame 30 in a direction parallel to the lock pin 62 in the direction of arrow c which is a direction orthogonal to the mounting direction to the taking lens and is rotatable about the shaft 69. 70 is provided and the frame 3
With a tension spring 71 whose one end is attached to the protrusion of 0,
The bent tip side of the lever 70 is urged in the direction of arrow b, which is the lens insertion side. Further, a stopper 73 having an abutting portion in a direction orthogonal to the interlocking lever 70 and having a pin 72 is integrally supported on the interlocking lever 70, and is pushed by the push-up spring 74 in a direction opposite to the arrow b direction. Biased in the direction.

Further, on the front side of the stopper 73, as shown in FIG. 4, a lock lever 76 rotatably supported by a shaft 75 provided on the frame 30 and a lock lever 76.
A switching lever 77 is provided which is in contact with the switching pin 68.

The screen shake preventing device thus constructed is mounted on the taking lens 80 as shown in FIG. 5 when shake correction such as shooting on a vehicle or on a helicopter is required. Then, the tip of the interlocking lever 70 is the photographing lens 8
When the front lens barrel 81 of 0 is pressed, the interlocking plate lever 70 becomes substantially parallel to the lock plate 66. Further, the stopper 73 is pushed by the lock plate 66 in the e direction against the biasing force of the tension spring 74. On the other hand, the frame bodies 36 and 38 are the lock pins 61,
The state where 62 enters the V-shaped portion of the lock plate 66 and its rotation is restricted, that is, the drive means for correcting the shake remains locked. At this time, the lock lever 7
6. The switching lever 77 does not operate as shown in FIG.

Next, the screen shake correction device is attached to the photographing lens 80.
When the shake correction is necessary with the camera mounted on, the lock lever 76 is rotated in the f direction as shown in FIG.
Similarly, the switching lever 77 also rotates in the f direction, and the lock plate 66
In order to push the switching pin 68 fixed to the lock plate 66, the lock plate 66 moves in the d direction to release the restriction of the lock pins 61 and 62 fixed to the frames 36 and 38. On the other hand, the stopper 73
As shown in FIG. 8, the lock plate 6 is pushed by the push-up spring 74.
6 is pushed out in the direction of arrow c to come into contact with the lock plate 66, and its movement in the direction of arrow c is restricted. This allows
The drive means for correcting shake is released.

Then, in the screen shake correcting apparatus, when shake occurs in the entire image pickup apparatus, the shake detectors 57 and 58 output a signal proportional to the magnitude of the shake. This signal is input to the control circuit 59 and is multiplied by an appropriate multiplier to calculate the size of the apex angle required to remove the shake. On the other hand, the rotation angles of the transparent plates 32 and 33 facing each other around the axes 35 and 37, that is, the fluctuations in the yaw direction and the pitch angle of the variable apex angle prism 31, are caused by the light beams emitted from the light emitting elements 46 and 55.
A frame 36 that rotates integrally with the transparent plates 32 and 33 facing each other.
Slits 44, 5 provided in the arms 45, 54 of the 38
3, the spot position on the light receiving surface moves when the light is incident on the light receiving elements 47 and 56 after passing through 3. Light receiving element 47,
56 is the movement amount of the spot, that is, the variable apex angle prism 3
A signal corresponding to the magnitude of the apex angle of 1 is transmitted to the control circuit 59.

The control circuit 59 calculates the difference between the size of the apex angle calculated above and the size of the apex angle at the present time, and multiplies the difference by a predetermined amplification factor to obtain the coil 39,
It is transmitted to the coil drive circuit 60 as a drive command signal 48. The coil drive circuit 60 applies a drive current according to the coil drive command signal to the coils 39 and 48 to generate a coil drive force.

The variable apex angle prism 31 is rotated about the axes 35 and 37 by this coil driving force, and is deformed so as to correspond to the magnitude of the apex angle calculated above. That is, the variable apex angle prism 31 corrects the shake by feedback control in which the value of the apex angle calculated to correct the shake is used as a reference signal and the current value of the apex angle is used as a feedback signal.

Next, when the screen shake preventing device is not used with the screen shake preventing device attached, as shown in FIG.
When the switch lever 77 is rotated in the g direction, the switching lever 77 also similarly rotates in the g direction.
Then, push the pin 72 fixedly attached to and push the stopper 73 in the direction of arrow c. As a result, the lock plate 66 is released from the restriction in the arrow c direction, and the lock plate 66 is urged by the tension spring 67 in the arrow c direction. Therefore, the lock plate 66 moves in the arrow c direction and locks again. The pins 61 and 62 are restricted by the lock plate 66, and the driving means for correcting the shake is locked.

Next, the photographer does not lock the driving means for correcting the shake, and instantly attaches the screen shake correcting device to the taking lens 80.
8 is not locked by the drive means for correcting the shake, the taking lens 80 is removed from the screen shake correcting apparatus, that is, the taking lens 80 in the h direction.
When is moved, the interlocking lever 70 biased by the tension spring 71 rotates in the direction of arrow b as shown in FIG. As a result, the stopper 73 supported by the interlocking lever 70 also rotates in the same direction, so that the restriction is released, and the lock plate 66 is moved in the direction of arrow c by the tension spring 67. As a result, the lock pins 61 and 62 are restricted by the lock plate 66, and the drive means for correcting the shake is locked.

FIG. 9 is a block diagram of the second embodiment. In the second embodiment, the interlocking lever 70, the lock lever 76,
The switching lever 77 and the like are omitted, and a light emitting element 90 and a light receiving element 91 facing each other are arranged in the frame 30 so as to sandwich the front lens barrel portion 81 of the taking lens 80. Further, the stopper 73 is supported by a stopper base 92 having a rack so as to come in contact with and away from the lock plate 66, and the frame 30 is provided with a motor 94 having a gear 93 that meshes with the rack.

In the screen shake preventing device having such a configuration, when the taking lens 80 is detached from the taking lens 80, that is, the taking lens 80 is moved in the direction of the arrow h, the luminous flux emitted from the light emitting element 90 enters the light receiving element 91, A command is sent to the motor 94 based on this signal, and the stopper base 92, that is, the stopper 73 is moved in the arrow h direction via the gear 93, as shown in FIG. Thereby, the arrow c of the lock plate 66
The restriction in the direction is released, and the lock plate 66 is pulled by the tension spring 67.
Thus, the lock pins 61 and 62 are moved in the direction of arrow c by the lock plate 66, and the drive means for correcting the shake is locked.

Further, in the first embodiment, the interlocking lever 70 is made to interlock with the front lens barrel 81 of the taking lens 80, but this is provided with the operating grip 82 of the taking lens 80.
You may make it interlock with.

[0040]

As described above, the screen shake preventing apparatus according to the first aspect of the present invention, when removing the apparatus from the taking lens,
Since the driving means for correcting the shake in association with the movement is locked by the lock means, the shake correction is reliably stopped, and damage to the variable apex angle prism or the drive means for driving the variable apex angle prism can be prevented.

Further, in the screen shake preventing apparatus according to the second aspect of the present invention, since the driving means can be locked while being attached to the taking lens, the shake correction of the screen shake correcting apparatus is stopped when the apparatus is further attached to the taking lens. Therefore, even if a shock is applied to the photographing lens, the variable apex angle prism and the driving means for driving the variable apex angle prism are stopped, and the damage can be prevented.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a side view in which a part corresponding to a taking lens is cut away.

FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2 before being attached to the taking lens.

FIG. 4 is a sectional view taken along the line BB in FIG. 2 before being attached to the taking lens.

5 is a cross-sectional view taken along the line AA of FIG. 2 when it is attached to the taking lens.

FIG. 6 is a cross-sectional view taken along the line BB of FIG. 2 when it is attached to the taking lens.

7 is a cross-sectional view taken along the line BB of FIG. 2 in a state where the lock is released when the lens is attached to the taking lens.

FIG. 8 is a cross-sectional view taken along the line AA of FIG. 2 in a state where the lock is released when the lens is attached to the taking lens.

FIG. 9 is a configuration diagram of a second embodiment.

10 is a cross-sectional view taken along the line CC of FIG.

FIG. 11 is an exploded perspective view of a conventional example.

[Explanation of symbols]

 30 frame 31 variable apex prism 32, 33 transparent plate 57, 58 shake detector 59 control circuit 60 coil drive circuit 61, 62 lock pin 66 lock plate 70 interlocking lever 73 stopper 76 lock lever 80 shooting lens 81 front lens barrel 90 Light emitting element 91 Light receiving element 92 Stopper stand

Claims (7)

[Claims] 1. A shake detecting means for detecting shake of the entire apparatus and a photographing optical path of a photographing lens, wherein the imaging optical path is inclined by relative tilting of a pair of transparent plates with a transparent liquid interposed therebetween. A variable apex angle prism for correcting shake, a drive unit for tilting the pair of transparent plates relative to each other to correct shake, and a control unit for driving and controlling the drive unit. A screen shake correction apparatus capable of performing the above-described operation, further comprising a lock unit that locks the drive unit in association with a movement of detaching from the photographing lens. 2. The screen shake correcting apparatus according to claim 1, wherein the lock means has a member that interlocks with a relative position change of the taking lens when the taking lens is detached from the front lens barrel. 3. The screen shake correction device according to claim 1, wherein the lock means has a member that interlocks with a relative position change of an operation grip of the photographing lens when the lock means is detached from the photographing lens. 4. The screen shake correction device according to claim 1, wherein the lock unit electrically includes a unit for detecting a movement of detachment from the photographing lens. 5. The screen shake correcting apparatus according to claim 4, wherein a light emitting element and a light receiving element are used as means for electrically detecting movement of detachment from the taking lens. 6. A shake detecting means for detecting shake of the entire apparatus and a photographing optical path of a photographing lens, wherein the imaging optical path is tilted by relative tilting of a pair of transparent plates with a transparent liquid interposed therebetween. A variable apex angle prism for correcting shake, a drive unit for tilting the pair of transparent plates relative to each other to correct shake, and a control unit for driving and controlling the drive unit. In a screen shake correction apparatus capable of performing the above, a first locking unit that locks the driving unit in association with a movement of detaching from the photographing lens, and a second locking unit that locks the driving unit in a state of being attached to the photographing lens. A screen shake correction device having a lock means of 1. 7. A first lock member that locks the drive means in conjunction with the movement of detachment from the taking lens, and a second lock member that locks the drive means when attached to the taking lens. The screen shake correction device according to claim 6, wherein the screen shake correction device is shared.