JP2001281716A - Image blurring preventive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image blurring preventive device to perform accurate vibration-proofing operation by properly detecting vibration which affects image blurring by attaching a detecting means through an elastic member. SOLUTION: Angular velocity sensors 76 and 78 are attached to the mount frame 17 of a lens supporter 16 through an elastic body 84 in this image blurring preventive device 20. Thus, the vibration caused at the inside of the image blurring preventive device 20 is absorbed by the elastic body 84 and is not transmitted to the angular velocity sensors 76 and 78.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-shake device and, more particularly, to an anti-shake device for driving a correction lens of a studio camera device to prevent image blur due to vibration of the studio camera device.

[0002]

2. Description of the Related Art Conventionally, an image blur prevention device for a television lens has a correction lens movably supported in a plane perpendicular to the photographing optical axis, and when a vibration is applied to the camera, the device is moved by an actuator in a direction to cancel the vibration. To prevent image blurring.

[0003] Japanese Patent Application Laid-Open No. 11-284900 discloses an image blur prevention device provided on a lens supporter for attaching a lens device to a camera body. In this image blur prevention device, a vibration detector (angular velocity sensor or acceleration sensor) for detecting vibration of the camera is directly installed on the camera body or the lens barrel.

[0004]

However, when a vibration detector is directly installed on a camera body or the like as in the image blur prevention device described in Japanese Patent Application Laid-Open No. 11-284900, the correction lens of the image blur prevention device is driven. There was a problem that vibration was detected by a vibration detector. Since the vibration due to the driving of the correction lens is originally a vibration which is not related to the image blur, if such a vibration is detected and the correction lens is driven, the performance of the image blur prevention is deteriorated.

The present invention has been made in view of such circumstances, and has as its object to provide an image blur preventing apparatus capable of detecting only vibration affecting image blur and appropriately preventing image blur. And

[0006]

According to a first aspect of the present invention, in order to attain the above object, a camera vibration is detected, and a correction optical system is driven based on the detected vibration, whereby the camera vibration is detected. In the image blur preventing apparatus for preventing image blur caused by the above, the detecting means for detecting the vibration of the camera is attached to the camera via the vibration isolating means for interrupting the vibration due to the driving of the correction optical system. And

According to the first aspect of the invention, the vibration generated by driving the correction optical system is cut off by the vibration cut-off means, and is not transmitted to the detection means. Therefore, since the detection means can detect only the vibration affecting the image blur, the image blur can be appropriately prevented.

According to a third aspect of the present invention, in order to achieve the above object, a camera vibration is detected, and a correction optical system is driven based on the detected vibration to prevent image blur caused by the camera vibration. In the image blur prevention apparatus described above, the detection means for detecting the vibration of the camera is arranged separately from the camera.

According to the third aspect of the present invention, even if the correction optical system vibrates, the vibration is not transmitted to the detecting means separated from the camera. Therefore, since the detection means can detect only the vibration affecting the image blur, the image blur can be appropriately prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an image blur prevention apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is an overall view showing an embodiment of a studio camera device 10 to which the image blur prevention device of the first embodiment is applied.

In the studio camera device 10 shown in FIG. 1, a screen-shaped lens supporter 16 is fixed on a camera platform 14 of a tripod 12, and an ENG camera ( Hereinafter, simply referred to as a camera.) 18 is supported via an image blur prevention device 20. On the left side of the mounting frame 17 in FIG.
The P lens device 22 is supported. Reference numeral 16A in the figure is a height adjustment knob for adjusting the height of the camera 18.

The lens mount 23 at the rear end of the lens device 22
Is the opening 17 of the mount frame 17 of the lens supporter 16
A is inserted through a decorative ring 21A provided on the left side of FIG. Further, a mount 21B is provided on the right side in FIG. 2 of the image blur prevention device 20, and a mount 19 of the camera 18 is connected to the mount 21B. Thereby, the camera 1
The lens 8 and the lens device 22 are supported by the lens supporter 16 and the image blur prevention device 20 with their optical axes aligned.

At the rear end face of the mount frame 17 of the lens supporter 16, a boss 28 having a screw hole is formed so as to protrude in the horizontal direction. The boss 28 is fitted into a casing 30 provided on the image blur prevention device 20 side, and a screw rod 34 supported by the casing 30 is screwed into a screw hole of the boss 28. Thereby, the image blur prevention device 20 is positioned and attached to the lens supporter 16.

FIG. 3 is a front view showing a support structure of the correction lens 40 built in the image blur prevention device 20. As shown in the figure, in the main body 21 of the image blur prevention device 20, a correction lens 40 is disposed while being held by a lens frame 42. The correction lens 40 is moved by linear motors 44 and 46 in a direction perpendicular to the photographing optical axis L in a direction in which image blur is corrected. The correction lens 40 is movably supported by the main body 21 via a parallel link mechanism including four arms 48, 48, 50, 50.

The linear motor 44 moves the correction lens 40 in the left-right direction, and includes a motor body 44A and a rod 44B. The motor main body 44A is fixed to the main body 21, and the tip of the rod 44B is engaged with the long hole 52 of the lens frame 42 via a roller 54.
The long hole 52 is formed on the left side of the lens frame 42 in the up-down direction, so that the long hole 52 and the roller 54 are relatively movably engaged in the up-down direction. Motor body 44A
When the rod 44B expands and contracts with the driving force described above, the correction lens 40 is pushed by the rod 44B or pulled by the rod 44B to move in the left-right direction.

A connecting frame 56 is fixed to the rod 44B of the linear motor 44. The connection frame 56 is disposed in the up-down direction, the rod 44B is fixed at the center, and the upper and lower ends are slidably supported by the linear guides 58, 58, respectively. The linear guides 58, 58 are provided in parallel with the rod 44B, and when the rod 44B is expanded and contracted, the connecting frame 56 moves in the left-right direction while maintaining its posture.

The distal end of the contact needle 60B for detection of the position sensor 60 is pressed against the connecting frame 56. The position sensor 60 detects the amount of movement of the connecting frame 56 that has its sensor main body 60A fixed to the main body 21 at a position where the detection contact needle 60B is parallel to the rod 44B, and moves in parallel by the expansion and contraction of the rod 44B. I do.

The position sensor 60 does not directly contact the detecting contact needle 60B with the peripheral surface of the lens frame 42, but contacts the connecting frame 56 which can indirectly detect the amount of movement of the correction lens 40. In contact. As described above, the connecting frame 56 moves in parallel while maintaining the posture regardless of the amount of expansion and contraction of the rod 44B.
B does not shift or slip from the connection frame 56.

Reference numeral 62A denotes a bobbin constituting the speed generator 62, and reference numeral 62B denotes a core constituting the speed generator 62. The core 62B is fixed to the connection frame 56.

On the other hand, the linear motor 46 is
0 is moved up and down, and the motor body 46A,
It is composed of a rod 46B. The motor main body 46A is fixed to the main body 21, and the tip of the rod 46B is engaged with the long hole 64 of the lens frame 42 via a roller 66. The long hole 64 is formed below the lens frame 42 in the left-right direction in FIG. 6, so that the long hole 64 and the roller 66 are relatively movably engaged in the left-right direction in FIG. When the rod 46B expands and contracts by the driving force of the motor body 46A, the lens frame 42 is pushed by the rod 46B or pulled by the rod 46B and moves in the vertical direction.

A connecting frame 68 is fixed to the rod 46B of the linear motor 46. The connecting frame 68 is disposed in the left-right direction, the rod 46B is fixed to the center, and the left and right ends are slidably supported by the linear guides 70, 70, respectively. The linear guides 70, 70
When the rod 46B is expanded and contracted, the connecting frame 68 moves up and down while maintaining its posture.

The tip of a contact needle 72B for detection of the position sensor 72 is pressed against the connecting frame 68. The position sensor 72 detects the amount of movement of the connection frame 68 in which the sensor main body 72A is fixed to the main body 21 at a position where the detection contact needle 72B is parallel to the rod 46B, and moves in parallel by the expansion and contraction operation of the rod 46B.

As with the position sensor 60, the position sensor 72 does not directly contact the detection contact needle 72B with the peripheral surface of the lens frame 42, but indirectly detects the amount of movement of the correction lens 40. In contact with a connection frame 68 that can be formed. Since the connection frame 68 moves in parallel while maintaining the posture regardless of the amount of expansion and contraction of the rod 46B, the detection contact needle 60B does not slip or slip from the connection frame 68 during the movement.

Reference numeral 74A denotes a bobbin constituting the speed generator 74, and reference numeral 74B denotes a core constituting the speed generator 74. The core 74B is fixed to the connection frame 68.

FIG. 4 is a block diagram showing a drive control system of the correction lens 40 of the image blur prevention device 20. The angular velocity sensors 76 and 78 shown in FIG.
6 is provided on the side surface or the upper surface of the mount frame 17.

The angular velocity sensor 76 detects a horizontal vibration component in FIG. 3 of the vibration transmitted to the camera 18, and the detected information is output to a CPU (central processing unit) 80. The CPU 80 controls the angular velocity sensor 7
6 to calculate the amount of correction movement in the left-right direction to be given to the correction lens 40 based on the information from Step 6. The signal indicating the correction movement amount in the left-right direction is amplified by the amplifier 82 and then output to the linear motor 44 (see FIG. 3). The linear motor 44 extends or contracts the rod 44B by an amount corresponding to the signal from the CPU 80.

On the other hand, the angular velocity sensor 78 detects a vertical vibration component in FIG. 3 of the vibration transmitted to the camera 18, and the detected information is output to the CPU 80. The CPU 80 calculates a vertical correction amount to be given to the correction lens 40 based on information from the angular velocity sensor 78, and outputs a signal indicating the vertical correction amount to the linear motor 46 via the amplifier 82. . The linear motor 46 extends or contracts the rod 46B by an amount corresponding to a signal from the CPU 80.

The anti-shake device 20 constructed as described above
According to the left and right directions from the angular velocity sensor 76 or 78,
Or, when the vertical vibration information is output to the CPU 80,
The CPU 80 calculates a horizontal or vertical correction movement amount to be given to the correction lens 40, and outputs a signal indicating the correction movement amount to the linear motor 44 or 46. The linear motors 44 and 46 extend or contract the rods 44B and 46B by an amount corresponding to the signal from the CPU 80, and move the correction lens 40 to a position where image blur is corrected. As a result, the horizontal or vertical vibration component is canceled by the movement of the correction lens 40, and the horizontal or vertical image blur is corrected.

When the correcting lens 40 moves, the position sensor 60 or 72 detects the moving position of the connecting frame 56 or 68. The position signal detected by the position sensor 60 is compared with the signal indicating the corrected movement amount output from the CPU 80, and the linear motor 44 or 46 is
The CPU 80 performs feedback control to position the correction lens 40 at a position corresponding to the correction movement amount.

The angular velocity sensor 78 is mounted on the upper surface of the mount frame 17 via an elastic body 84 made of rubber, sponge, or the like, as shown in FIG. Thus, even if the correction lens 40 vibrates by driving the image blur prevention device 20, the vibration is absorbed by the elastic body 84 and is not transmitted to the angular velocity sensor 78. Therefore, the angular velocity sensor 78 can accurately detect the vertical component of the vibration transmitted to the camera 18.

Like the angular velocity sensor 78, the angular velocity sensor 76 is attached to the side surface of the mount frame 17 via an elastic body (not shown). As a result, the vibration of the correction lens 40 is not transmitted to the angular velocity sensor 76.
Can be accurately detected.

The mounting positions of the angular velocity sensors 76 and 78 are not limited to the mounting frame 17 of the lens supporter 16, but may be outside or inside the camera 18, the body 21 of the image blur prevention device 20, and the lens device 22. There may be. Also in this case, by attaching the angular velocity sensors 76 and 78 via the elastic body, it is possible to prevent the vibration of the correction lens 40 from being transmitted to the angular velocity sensors 76 and 78.

The internal structure of the image blur prevention device 20 is not limited to the embodiment shown in FIG.
Various structures are possible for a specific structure in which 0 is appropriately moved by a driving unit such as an actuator.

Next, the operation of the image blur prevention device 20 configured as described above will be described.

In the image blur prevention device 20, when the studio camera device 10 vibrates, the angular velocity sensors 76 and 78 detect vibration components in the horizontal and vertical directions, respectively, and the CPU 80 corrects the amount of movement based on these detected values. Is calculated.
Then, the linear motors 44, 4
6 is driven to move the correction lens 40. As a result, the vibration of the studio camera device 10 is canceled, and the image blur is corrected.

However, driving the linear motors 44 and 46 may cause vibration in the image blur prevention device 20. Since this vibration is not related to the image blur, if the vibration is transmitted to and detected by the angular velocity sensors 76 and 78, the performance of the image blur prevention is deteriorated. In the image blur prevention device 20 described above, since the angular velocity sensors 76 and 78 are attached via the elastic body 84, the vibration generated in the image blur prevention device 20 is absorbed by the elastic body 84 and the angular velocity sensor 76, Not transmitted to 78. Therefore, the angular velocity sensors 76 and 78 do not detect the vibration generated in the image blur prevention device 20. Accordingly, the angular velocity sensors 76 and 78 can accurately measure the vibration of the studio camera device 10 to be subjected to image stabilization, so that the image blur prevention device 20 can perform an accurate image stabilization operation.

As described above, according to the image blur preventing apparatus 20 of the first embodiment, the angular velocity sensors 76 and 78 are
Since the camera camera is attached via the camera 4, the vibration of the studio camera device 10 can be accurately measured, and image blur can be reliably prevented.

In the above-described first embodiment, the angular velocity sensors 76 and 78 are directly attached to the elastic body 84. However, the present invention is not limited to this. For example, the angular velocity sensor 86 shown in FIG. 5 is attached via a sensor base 87. A hole 87A is formed in the sensor base 87, and a screw 88 is inserted into the hole 87A and screwed into the mount frame 17 of the lens supporter 16. The sensor base 8 between the sensor base 87 and the head of the screw 88
O-rings 89, 89 made of an elastic material are inserted between the screws 88 and the mount frame 17.
Thus, the sensor substrate 87 is supported via the O-rings 89, 89. Therefore, the vibration generated in the image blur prevention device 20 is blocked by the O-rings 89, 89 and is not transmitted to the angular velocity sensor 86.

Further, in the above-described first embodiment, the elastic body 84 is shown as an example of the vibration isolating means. However, the present invention is not limited to this. Any member that absorbs no vibration may be used.

FIG. 6 is an overall view of a studio camera device to which the image blur prevention device of the second embodiment is applied, and FIG. 7 is a perspective view of the angular velocity sensor shown in FIG. Note that members that are the same as or similar to those of the first embodiment shown in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.

As shown in the figure, in the image blur prevention device 90 of the second embodiment, the angular velocity sensor 91 is separated from the studio camera device 10 and disposed on the floor 92 on which the studio camera device 10 is installed. ing. Angular velocity sensor 91
Is formed in a substantially hemispherical shape so that the angular velocity sensor 91 cannot be installed upside down. A rubber disc 93 made of an elastic material such as rubber is attached to a lower portion of the angular velocity sensor 91. By installing the angular velocity sensor 91 on the floor 92 via the rubber disc 93,
It is possible to prevent minute vibrations not related to image blurring from being transmitted to the angular velocity sensor 91.

The angular velocity sensor 91 is provided with an index 94 indicating the direction in which the sensor should be installed. Angular velocity sensor 9
Numeral 1 is installed so that the direction indicated by the index 94 is aligned with the photographing optical axis direction of the studio camera device 10.
Note that, in FIG. 7, an arrow is described as an example of the index 94,
The present invention is not limited to this, and characters such as “before” and “after” may be used.

In the image blur prevention device 90 of the second embodiment configured as described above, when the floor 92 on which the studio camera device 10 is installed vibrates, the angular velocity sensor 91 installed on the floor 92 A vertical component and a horizontal component of the vibration are detected. Then, the vibration information is transmitted to the cable 9.
5, the CPU 80 calculates a correction moving amount to be given to the correction lens 40. The linear motors 44 and 46 move the correction lens 40 in accordance with the amount of correction movement to prevent image blur. At this time, vibration may occur in the image blur prevention device 90, but is not transmitted to the angular velocity sensor 91 because the angular velocity sensor 91 is arranged separately from the studio camera device 10. Therefore, since the angular velocity sensor 91 can accurately measure only the vibration that affects image blur, the image blur prevention device 90 can perform an accurate vibration reduction operation.

In the above-described embodiment, the angular velocity sensor 91 is provided on the floor 92. However, the present invention is not limited to this, and the angular velocity 91 may be provided separately from the studio camera device 10.

The shape of the angular velocity sensor 91 is not limited to the above-described embodiment, but may be a rectangular shape. In this case, an index indicating the up-down direction is also required at the time of installation.

The angular velocity sensor 91 may be fixed to the floor 92 or the like by providing an adhesive layer on the lower surface of the elastic disk 93 attached to the angular velocity sensor 91 described above.

In the second embodiment described above, the angular velocity sensor 91 and the image blur prevention device 90 are connected to the cable 95.
And the vibration information detected by the angular velocity sensor 91 is transmitted and received via the cable 95, but may be transmitted and received wirelessly.

Further, in the first and second embodiments described above, the angular velocity sensors 76, 78,
Although 91 is used, an acceleration sensor may be used.

[0050]

As described above, according to the image blur preventing apparatus of the present invention, the vibration which is not related to the image blur is not transmitted to the detecting means, so that the vibration affecting the image blur can be properly detected. In addition, image blur can be accurately prevented.

[Brief description of the drawings]

FIG. 1 is an overall view of a studio camera device to which an image blur prevention device according to a first embodiment is applied.

FIG. 2 is a side view showing a support structure of a camera and a lens device with respect to a lens supporter.

FIG. 3 is a structural diagram showing a support structure of a correction lens built in the image blur prevention device.

FIG. 4 is a block diagram showing a control system of the image blur prevention apparatus shown in FIG. 3;

FIG. 5 is a side view showing the angular velocity sensor mounted with a mounting structure different from that of FIG. 3;

FIG. 6 is an overall view of a studio camera device to which the image blur prevention device according to the second embodiment is applied.

FIG. 7 is a perspective view of the angular velocity sensor shown in FIG. 6;

[Explanation of symbols]

10: Studio camera device, 16: Lens supporter, 1
7: mount frame, 18: ENG camera, 20: image blur prevention device, 22: lens device, 40: correction lens, 44,
46 ... linear motor, 60, 72 ... position sensor, 76,
78: angular velocity sensor, 84: elastic body

Claims (3)

[Claims] 1. An image blur prevention apparatus for detecting camera vibration and driving a correction optical system based on the detected vibration to prevent image blur caused by the camera vibration. Detection means, via a vibration cutoff means for blocking vibration due to the drive of the correction optical system,
An image blur prevention device attached to the camera. 2. The image blur prevention device according to claim 1, wherein said vibration blocking means is an elastic member. 3. An image blur prevention device for detecting camera vibration and driving a correction optical system based on the detected vibration to prevent image blur caused by the camera vibration. An image blur prevention device, wherein the detecting means for performing the detection is arranged separately from the camera.