JP3114332B2 - Camera anti-vibration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, various proposals have been made with respect to a camera anti-vibration device for preventing image blur on an image forming surface due to camera shake or the like. It is composed of various elements. That is, a correction optical system lens for correcting image blur on the image forming surface, camera shake detection means (acceleration sensor, etc.) for detecting the magnitude and direction of camera vibration,
Calculating 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 constituted by driving means for moving the correction optical system lens based on information from the calculating means, and the like.

FIG. 4 shows a conventional camera shake isolator. The correction optical system lens 1 is held by a lens frame 2, and the lens frame 2 is provided with leaf springs 3, 3 fixed to the left and right sides of the lens frame 2, a moving member 4, and a vertically moving member 4. Are supported by the camera body 6 via leaf springs 5 fixed to the camera body 6. A screw motor 7 is attached to the lens frame 2, and when the screw motor 7 is driven, the leaf springs 3 are bent right and left.
The lens frame 2 can be moved right and left with respect to the optical axis 8. Further, by driving the screw motor 9 attached to the moving member 4, the leaf springs 5, 5 are bent 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 based on information from a calculating means calculated based on camera shake information from an unillustrated acceleration sensor, and move the correction optical system lens 1 to move an image caused by camera shake. Move up, down, left and right by the amount to cancel. FIG. 5 shows another embodiment of a conventional camera image stabilizer. The lens frame 2 holding the correction optical system lens 1 has four leaf springs 10,
10 are held in the cylindrical body 11 via. The distal ends of the movement control rods 12 and 13 are attached to the outer peripheral surface of the lens frame, and the lens frame 2 is moved right and left with respect to the optical axis 8 by swinging the movement control rod 12 right and left. Can be moved. Further, the lens frame 2 can be moved up and down with respect to the optical axis 8 by swinging the movement control rod 13 up and down.

The movement control rods 12 and 13 are driven based on camera shake information from an acceleration sensor in the same manner as the screw motors 7 and 9 shown in FIG.
Is moved up, down, left, and right by an amount that cancels the movement of the image caused by camera shake.

[0006]

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

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has as its object to provide a camera anti-vibration device capable of simplifying the structure and stably supporting the lens frame.

[0008]

According to the present invention, there is provided a lens frame having a correction optical system lens for correcting camera shake and having a groove formed in a circumferential direction on an outer peripheral surface thereof. A first, a second, and a third drive member that is swingably attached to the body and the camera body, and presses and urges the grooves of the lens frame at equal intervals at its distal end to hold the lens frame. The lens frame is moved by transmitting the driving force to the first and second driving members and swinging the first and second driving members based on information from the camera shake detecting means. And first and second driving means for moving the correction optical system lens by an amount that cancels the movement of an image caused by camera shake.

[0009]

According to the present invention, the distal ends of the first, second and third driving members are pressed against the grooves formed in the lens frame to hold the lens frame, and the camera shake detecting means is used to detect the camera. When the blur is detected, the first and second driving means are operated based on the blur information to rotate the first and second driving members, and the lens frame is biased by the third driving 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 camera vibration isolator according to the present invention, the lens frame is supported by the first, second and third driving members, so that the conventional camera in which the lens frame is held by a leaf spring. The lens frame can be stably supported as compared with the vibration damping device of (1). In addition, the first and second supporting members for supporting the lens frame are provided.
Since the lens frame is moved by swinging the driving member, the structure of the vibration isolator can be simplified.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a camera according to an embodiment of the present invention; FIG. 1 is a perspective view showing a first embodiment of a camera image stabilizer 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 22, which is mounted on a camera body (not shown). The body 24 is supported at its center by three drive levers 26, 28 and 30 shown in FIG. The drive levers 26, 28, 30 are arranged at equal intervals on the cylindrical body 24, and are mounted on shafts 32, 3,
It is swingably supported by the cylindrical body 24 with the fulcrums 2 and 32 as fulcrums. Further, the drive levers 26, 28, 30 are shown in FIG.
A spring 34 mounted on the shafts 32, 32, 32 shown in FIG.
2 are urged in the counterclockwise direction in FIG. 2 so that the spherical distal ends 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. Is pressed against the groove 22a. As a result, the lens frame 22 is
It is supported at three points at 28 and 30 and is supported at the center of the tubular body 24.

The proximal end 26 of the drive levers 26, 28
b and 28b have rotating shafts 40 of drive motors 36 and 38,
The cams 44 and 46 fixed to 42 come 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
It can be swung with the fulcrum 4 and 34 as fulcrums. The drive motors 36 and 38 are connected to a control device (not shown). The control device calculates a correction movement amount for moving the correction optical system lens 20 by an amount that cancels the movement of an image caused by camera shake based on camera shake information from an acceleration sensor (not shown) provided in the camera body, The information obtained by the calculation can be output to the drive motors 36 and 38.

Next, the operation of the camera vibration isolator 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, swings the drive levers 26 and 28, and moves the correction optical system lens 20 to the camera shake. Is moved by an amount that cancels the movement of the image caused by the movement.

For example, when the correction optical system lens 20 is moved downward in FIG. 2 (direction A in FIG. 2) to cancel the movement of an image caused by camera shake, only the drive motor 36 is rotated forward to drive. The lever 26 is swung counterclockwise in FIG. As a result, the lens frame 22 is guided by the distal end portion 28 a of the fixed drive lever 28 and moves in the lower left direction against the urging force of the drive lever 30.

When the correction optical system lens 20 is to be moved upward (in the direction B in the figure), only the movement drive motor 36 is reversely rotated so that the drive lever 26 is turned clockwise against the urging force of the spring 34. Rock around. As a result, the lens frame 22 is guided by the distal end portion 28 a of the drive lever 28 and moves upward in the right direction by the urging force of the drive lever 30.

On the other hand, when the correction optical system lens 20 is moved leftward (direction C in the figure), only the drive motor 38 is rotated forward to swing the drive lever 28 counterclockwise. As a result, the lens frame 22 is guided by the distal end portion 26a of the fixed drive lever 26, and moves upward in the figure against the urging force of the drive lever 30. When the correction optical system lens 20 is moved rightward (direction D in the figure), only the drive motor 38 is rotated in the reverse direction to swing the drive lever 28 clockwise against the urging force of the spring 34. Let it. As a result, the lens frame 22 is guided by the distal end portion 26a of the drive lever 26 and moves in the lower 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 normal and reverse directions, the lens frame 22 can be moved in a plane in any direction, so that the correction optical system lens 20 cancels the movement of an image caused by camera shake, and the amount thereof. Can be moved in any direction. Therefore, according to the first embodiment, the lens frame 22 is supported in the cylindrical body 24 by the three drive levers 26, 28, 30. The lens frame can be stably supported as compared with the vibration device.

Further, the drive levers 26 and 28, which are support members of the lens frame 22, are swung so that the lens frame 22 is rotated.
Is moved, so that the structure of the camera shake isolator can be simplified as compared with the conventional camera shake isolator.

[0020]

As described above, according to the camera anti-vibration device of the present invention, the grooves formed in the lens frame are first and second.
Since the lens frame is supported by being pressed and biased at the distal end portions of the second and third drive members, the lens frame can be stabilized compared to a conventional camera vibration isolator supported by a leaf spring. I can support it.

Further, the first, which is a supporting member of the lens frame,
Since the correcting optical system lens is moved by rotating the second driving member by the first and second driving means, the structure of the vibration isolator can be simplified.

[Brief description of the drawings]

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

FIG. 2 is a front view of FIG.

FIG. 3 is a sectional view in FIG. 2;

FIG. 4 is a perspective view showing a first embodiment of a conventional camera image stabilizer.

FIG. 5 is a front view showing a second embodiment of a conventional camera shake isolator.

[Explanation of symbols]

 Reference Signs List 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)

(57) [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 on an outer peripheral surface thereof, and a lens body pivotally attached to a camera body, and a tip end thereof. And first, second and third driving members for holding the lens frame by pressing and pressing the grooves of the lens frame at equal intervals, and connecting the first and second driving members to transmit the driving force. Based on information from the camera shake detecting means.
First and second driving means for moving the lens frame by swinging the driving member of (1) to move the correction optical system lens by an amount that cancels the movement of an image caused by camera shake. Characteristic camera anti-vibration device.