JPH05257088A - Vibration proof device for camera - Google Patents

Abstract

PURPOSE:To stably support a lens frame body and to simplify the structure of a device by providing specific first - third driving members and first and second driving means. CONSTITUTION:A frame body 22 is held in such a manner that the top end parts 26a, 28a, and 30a of driving levers 26, 28, and 30 are pressed in grooves 22a formed on the lens frame body 22. When camera jigging is detected by an acceleration sensor, driving motors 36 and 38 are operated, based on the information of the camera jigging to turn the driving levers 26 and 28, and the frame body 22 is moved by the pressing force of the driving lever 30 or against its pressing force, so that a correction optical system lens 20 is moved by an amount to offset the movement of an image produced by the camera jiggling. Since the lens frame body 22 is supported by the driving lever like this the frame body 22 can be stably supported. Moreover, the driving levers 26 and 28 of the frame body 22 are rocked, to move the frame body 22. Thus, the structure of the device can be simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera image stabilizing device, and more particularly to a camera image stabilizing device for preventing image blur caused by camera vibration.

[0002]

2. Description of the Related Art Various proposals have heretofore been made regarding a camera anti-vibration device for preventing image blurring on an image plane caused by camera shake or the like. It is composed of various elements. That is, a correction optical system lens that corrects image blur on the image plane, a camera shake detection unit (acceleration sensor, etc.) that detects the magnitude and direction of camera vibration,
Calculation means for calculating a correction movement amount to be given to the correction optical system lens based on information from the camera shake detection means,
It is composed of driving means for moving the correction optical system lens based on information from the computing means.

FIG. 4 shows a conventional image stabilizing device for a camera. The correction optical system lens 1 is held by a lens frame body 2, and the lens frame body 2 is provided with leaf springs 3, 3 fixed to the left and right sides of the lens frame body 2, a moving member 4, and upper and lower sides of the moving member 4. It is supported by the camera body 6 via leaf springs 5 and 5 fixed to the camera body 6. A screw motor 7 is attached to the lens frame 2, and by driving the screw motor 7, the leaf springs 3 and 3 are bent to the left and right,
The lens frame body 2 can be moved left and right with respect to the optical axis 8. Further, by driving the screw motor 9 attached to the moving member 4, the leaf springs 4 and 4 bend up and down, so that the lens frame 2 can be moved up and down with respect to the optical axis 8.

The screw motors 7 and 9 are driven on the basis of information from a calculation means calculated on the basis of camera shake information from an acceleration sensor (not shown), and the correction optical system lens 2 moves an image caused by camera shake. Move up and down, left and right by the amount to cancel. FIG. 5 shows another example of a conventional camera vibration isolation device. The lens frame 2 holding the correction optical system lens 1 includes four leaf springs 10,
It is held in the tubular body 11 via 10 ... Further, the distal end portions of the movement control rods 12 and 13 are attached to the outer peripheral surface of the lens frame body, and by swinging the movement control rod 12 left and right, the lens frame body 2 is moved to the left and right with respect to the optical axis 8. Can be moved to. Further, the lens frame body 2 can be moved up and down with respect to the optical axis 8 by swinging the movement control rod 13 up and down.

Similar to the screw motors 7 and 9 shown in FIG. 4, the movement control rods 12 and 13 are driven based on the camera shake information from the acceleration sensor, and the correction optical system lens 2 is driven.
Is moved up and down, left and right by an amount that cancels the movement of the image caused by camera shake.

[0006]

However, as shown in FIG.
In the conventional camera vibration isolation device shown in FIG. 5, since the lens frame is supported by the leaf spring, the lens frame cannot be stably supported. Further, in the conventional image stabilizing device for a camera, since the leaf spring for holding the lens frame body and the screw motor or the movement control rod for moving the lens frame body are separately provided, the structure becomes complicated. is there.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a camera anti-vibration device that can simplify the structure and can stably support a lens frame.

[0008]

In order to achieve the above-mentioned object, the present invention holds a correction optical system lens for camera shake correction and has a lens frame in which a groove is formed in a circumferential direction of an outer peripheral surface thereof. A body, and first, second, and third drive members that are swingably attached to the camera body and that hold the lens frame body by pressing and urging the grooves of the lens frame body at equal intervals with the tip end portion thereof. , The first and second driving members are connected to each other so that the driving force can be transmitted, and the lens frame body is moved by swinging the first and second driving members based on the information from the camera shake detection means. And first and second driving means for moving the correction optical system lens by an amount that cancels the movement of the image caused by camera shake.

[0009]

According to the present invention, the tip end portions of the first, second and third driving members are pressed and urged against the groove formed in the lens frame body to hold the lens frame body, and the camera shake detection means is used for the camera. When a shake is detected, the first and second drive means are operated based on the shake information to rotate the first and second drive members, and the lens frame body is biased by the third drive member. Or by moving against the biasing force, the correction optical system lens is moved by an amount that cancels the movement of the image caused by camera shake.

Therefore, in the image stabilizing apparatus of the camera of the present invention, the lens frame is supported by the first, second and third driving members, so that the conventional camera holding the lens frame by the leaf spring is used. The lens frame can be supported more stably than the vibration control device of FIG. In addition, the first and second support members of the lens frame body
Since the lens frame body is moved by swinging the driving member, the structure of the vibration isolation device can be simplified.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a vibration isolator for a camera according to the present invention will be described in detail below with reference to the accompanying drawings. 1 is a perspective view showing a first embodiment of a vibration isolator for a camera according to the present invention, FIG. 2 is a front view, and FIG. 3 is a sectional view.

According to FIG. 1, a correction optical system lens 20 for camera shake correction is held by a cylindrical lens frame body 22, and this lens frame body 22 is a cylindrical shape attached to a camera body (not shown). It is supported in the center of the body 24 by three drive levers 26, 28 and 30 shown in FIG. The drive levers 26, 28, 30 are arranged on the tubular body 24 at equal intervals, and the shafts 32, 3 are attached to the substantially central portion.
It is swingably supported by the tubular body 24 with the points 2 and 32 as fulcrums. In addition, the drive levers 26, 28, 30 are shown in FIG.
A spring 34 mounted on the shaft 32, 32, 32 shown in FIG.
2 are respectively urged counterclockwise in FIG. 2, and the spherical tip portions 26a, 28a, 30a of the drive levers 26, 28, 30 are formed in the circumferential direction of the outer peripheral surface of the lens frame 22. The groove 22a is pressed and abutted. As a result, the lens frame body 22 has the drive lever 26,
It is supported at three points by 28 and 30, and is supported at the central portion of the tubular body 24.

The base ends 26 of the drive levers 26, 28
b and 28b, the rotary shafts 40 of the drive motors 36 and 38,
Cams 44 and 46 fixed to 42 are brought into contact with each other. Therefore, by driving the drive motors 36 and 38 to rotate the cams 44 and 46, the drive levers 26 and 28 are moved to the shaft 3.
It can be swung with 4, 34 as a fulcrum. The drive motors 36 and 38 are connected to a control device (not shown). This control device calculates a correction movement amount that moves the correction optical system lens 20 by an amount that cancels the movement of the image caused by the camera shake, based on camera shake information from an acceleration sensor (not shown) provided in the camera body, The information obtained by calculation can be output to the drive motors 36 and 38.

Next, the operation of the image stabilizing apparatus for a camera constructed as described above will be described. When the camera shake is detected by the acceleration sensor, the control device operates the drive motors 36 and 38 based on the camera shake information to swing the drive levers 26 and 28 to move the correction optical system lens 20 to the camera shake. The image is moved by an amount that cancels the movement of the image.

For example, when the correction optical system lens 20 is moved in the downward direction in FIG. 2 (direction A in the drawing) to cancel the movement of the image caused by the camera shake, only the drive motor 36 is driven to rotate normally. The lever 26 is swung counterclockwise in FIG. As a result, the lens frame body 22 is guided by the tip end portion 28a of the fixed drive lever 28 and moves in the leftward downward direction against the biasing force of the drive lever 30.

When the correction optical system lens 20 is moved in the upward direction (direction B in the figure), only the movement drive motor 36 is rotated in the reverse direction so that the drive lever 26 resists the biasing force of the spring 34 and rotates clockwise. Swing around. As a result, the lens frame body 22 is guided by the tip end portion 28 a of the drive lever 28 and moves in the upward right direction by the urging force of the drive lever 30.

On the other hand, when the correction optical system lens 20 is moved to the left (direction C in the figure), only the drive motor 38 is normally rotated to swing the drive lever 28 counterclockwise. As a result, the lens frame body 22 is guided by the front end portion 26a of the fixed drive lever 26 and moves in the upward left direction in the figure against the biasing force of the drive lever 30. When the correction optical system lens 20 is moved to the right (D direction in the figure), only the drive motor 38 is rotated in the reverse direction to swing the drive lever 28 clockwise against the biasing force of the spring 34. Let As a result, the lens frame body 22 is guided by the front end portion 26a of the drive lever 26 and is moved in the downward right direction in the figure by the urging force of the drive lever 30.

Further, when the drive motors 36 and 38 are simultaneously rotated in the forward and reverse directions, the lens frame 22 can be moved in a plane in any direction. Therefore, the correction optical system lens 20 cancels the movement of the image caused by the camera shake, and the amount thereof. Can be moved in any direction. Therefore, according to the first embodiment, the lens frame body 22 is supported in the cylindrical body 24 by the three drive levers 26, 28, 30. Therefore, the protection of the conventional camera that holds the lens frame body by the leaf spring is prevented. Compared with the shaking device, the lens frame can be supported more stably.

Further, by swinging the drive levers 26 and 28 which are supporting members of the lens frame 22, the lens frame 22 is moved.
Since the camera is moved, the structure of the image stabilizing device of the camera can be simplified as compared with the conventional image stabilizing device of the camera.

[0020]

As described above, according to the anti-vibration device for a camera of the present invention, the groove formed in the lens frame body has the first and second grooves.
Since the lens frame body is supported by pressing and urging the tip portions of the second and third driving members, the lens frame body is stabilized more than the conventional camera vibration isolation device supported by the leaf spring. Can be supported.

In addition, the first, which is a supporting member of the lens frame,
Since the correction optical system lens is moved by rotating the second driving member by the first and second driving means, the structure of the image stabilizing device can be simplified.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a vibration isolation device for a camera according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a sectional view of FIG.

FIG. 4 is a perspective view showing a first embodiment of a conventional image stabilizing device for a camera.

FIG. 5 is a front view showing a second embodiment of a conventional image stabilizing device for a camera.

[Explanation of symbols]

 20 ... Correction optical system lens 22 ... Lens frame 22a ... Groove 24 ... Cylindrical body 26, 28, 30 ... Drive lever 32 ... Shaft 34 ... Spring 36, 38 ... Drive motor 44, 46 ... Cam

Claims (1)

[Claims] 1. A lens frame body for holding a correction optical system lens for camera shake correction and having a groove formed in a circumferential direction of an outer peripheral surface of the lens frame body. The first, second, and third driving members that hold the lens frame body by pressing and biasing the grooves of the lens frame body at equal intervals are connected to the first and second driving members so that driving force can be transmitted. And the first and second information based on the information from the camera shake detection means.
The first and second drive means for moving the lens frame body by swinging the drive member to move the correction optical system lens by an amount that cancels the movement of the image caused by camera shake. Characteristic camera anti-vibration device.