JP2000039639A - Vibration-proof unit for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration-proof unit for a camera whose structure is simple, whose assembly is easy and by which the miniaturization of a device and the reduction of cost are realized by supporting the lens frame of a vibration-proof lens movably in the up-and-down direction by an inner holding frame on the outside of the lens frame, supporting the inner holding frame movably in the right-and-left direction by an outer holding frame on the outside of the inner holding frame and constituting the unit so as to drive the lens frame and the inner holding frame in the up-and-down direction and the right- and-left direction by actuators installed on the inner holding frame and the outer holding frame. SOLUTION: A vibration-proof lens 10 is fit and held in a lens frame 14, the lens frame 14 is supported to freely move in the up-and-down direction by an inner holding frame 16 through guides 19A and 19B and the inner holding frame 16 is supported to freely move in the right-and-left direction by an outer holding frame 18 through guides 20A and 20B. The lens frame 14 and the inner holding frame 16 are respectively driven in the up-and-down direction and the right-and-left direction by actuators 24 and 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image stabilizing unit for a camera, and more particularly to an image stabilizing unit for a camera in which an image blur caused by vibration applied to a lens barrel of the camera is corrected by an image stabilizing lens.

[0002]

2. Description of the Related Art An image stabilizing unit is mounted on, for example, a lens device of a television camera, and prevents image blur caused by wind or the like when the television camera is used outdoors or the like.
This anti-vibration unit uses a camera (lens device)
The lens barrel is movably supported in a plane perpendicular to the optical axis, and when vibration is applied to the lens barrel, the image stabilization lens is moved by an actuator in the direction to cancel the vibration so that image blur is corrected. It is configured.

[0003]

However, the conventional anti-vibration unit has a complicated mechanism for movably supporting the anti-vibration lens and a mechanism for moving the anti-vibration lens by the actuator, and thus the number of parts is small. In many cases, the assembling work requires complicated labor, and the apparatus is disadvantageously large in size.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a camera anti-vibration unit which simplifies the structure, facilitates assembly, and reduces the size and cost of the apparatus. Aim.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is applied to a lens barrel by moving an anti-vibration lens installed in the lens barrel in a plane perpendicular to the optical axis. A camera shake correction unit for correcting image blur caused by vibrations, the camera shake correction unit being disposed outside a lens frame of the image stabilizing lens and supporting the lens frame movably in a first direction perpendicular to the optical axis. A first frame and a second frame that is disposed outside the first frame and movably supports the first frame in a second direction that is perpendicular to the optical axis and different from the first direction. A second frame, which is installed on the first frame or the lens frame, and moves the lens frame in the first direction with respect to the first frame based on vibration applied to the lens barrel; 1 driving means, and the lens barrel installed on the second frame or the first frame. On the basis of the exerted vibration first
And second driving means for moving the frame in the second direction with respect to the second frame.

According to the present invention, the lens frame of the anti-vibration lens is movably supported by the first frame outside the first frame in a plane perpendicular to the optical axis, and the first frame is supported by the first frame. Outer second
And a driving means for movably supporting the lens frame and the first frame in the first and second directions respectively in the second direction different from the first direction. Since the device is installed in the second frame, the structure is simple, the number of parts is small, the assembly is easy, and the size and cost of the device can be reduced.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a camera according to the present invention. FIG. 1 is a vertical cross-sectional view of a lens barrel of a camera to which a camera vibration isolation unit according to the present invention is applied. As shown in the figure, the anti-vibration lens 10 of the anti-vibration unit has three frames 14, 1
The lens barrel 12 is held in the lens barrel 12 by a frame composed of 6 and 18. The frame body is a lens frame 1 for fitting and holding the anti-vibration lens 10.
4. An inner holding frame 16 that supports the lens frame 14 movably in the vertical direction, and an outer holding frame 18 that supports the inner holding frame 16 movably in the left and right direction and is fixed to the lens barrel 12; Each frame 14, 16, 18 is a thin plate-shaped guide 19
A, 19B, 20A, and 20B. The frames 14, 16, 18 and the guides 19A, 19B, 20A, 20B are integrally formed of an elastic member such as plastic.

The guides 19A and 19B are formed at two places on the left and right between the lens frame 14 and the inner holding frame 16,
When the guides 19A and 19B are elastically deformed,
The lens frame 14 moves vertically with respect to the inner holding frame. The guides 20A and 20B are formed at two upper and lower positions between the inner holding frame 16 and the outer holding frame 18. The guides 20A and 20B are elastically deformed so that the inner holding frame 16 is 18 to the left and right. Therefore, the anti-vibration lens 10 fitted and held in the lens frame 14 is moved in the plane perpendicular to the optical axis in the lens barrel 12 by the vertical movement of the lens frame 14 and the left and right movement of the inner holding frame 16. Can move up, down, left and right.

Also, the outer holding frame 18 has four mounting portions 2.
2, 22, 22, 22 are formed, and each mounting portion 22
The outer holding frame 18 is fixed to the lens barrel by screwing a screw through the hole 22A of the lens and screwing the screw into a screw hole formed in the lens barrel 12, and the frame body is positioned at a predetermined position in the lens barrel. Fixed. The lens frame 14, the inner holding frame 16, the outer holding frame 18, and the guides 19A, 19B, 20A, 20B can be manufactured and assembled more easily by integrally forming them. There is no. In FIG. 1, a total of four guides 19A, 19B, 20A, and 20B are provided one each in the upper, lower, left, and right directions. However, the present invention is not limited to this. For example, a total of eight guides are provided in two adjacent positions. Or between the lens frame 14 and the inner holding frame 16,
The inner holding frame 16 and the outer holding frame 18 may be connected by one guide. Means for movably supporting the lens frame 14 and the inner holding frame 16 in the vertical and horizontal directions, respectively, are the thin plate guides 19A, 19A
B, 20A and 20B need not be used, and any other means may be used.

As shown in FIGS. 1 and 2, an actuator 24 is attached to a lower portion of the inner holding frame 16, and a shaft 24A driven vertically by the actuator 24 is fixed to the lens frame 14. This actuator 24 drives the shaft 24A in the vertical direction by, for example, a piezoelectric element. When a drive signal is applied to the actuator 24 from a control unit 50 mounted on a camera (or a lens device), the actuator 24 is driven. Axis 2 based on signal
4A is vertically displaced. When the shaft 24A of the actuator 24 is displaced, the lens frame 14 is displaced in conjunction therewith, and the image stabilizing lens 10 moves in the vertical direction.

Similarly, on the left side of the outer holding frame 18 in FIG.
Is attached, and a shaft 26 </ b> A driven in the left-right direction by the actuator 26 is fixed to the inner holding frame 16. When a drive signal is applied from the control unit 50 to the actuator 26, the shaft 26A is displaced in the left-right direction, the inner holding frame 16 is displaced, and the vibration-proof lens 10 is moved in the left-right direction. . The actuator 2
Other driving means such as a linear motor may be used for the elements 4 and 26 instead of the piezoelectric elements.

A position detector 28 is provided above the inner holding frame 16. The position detecting unit 28 includes an LED light emitting unit 28A that emits light and a light receiving unit 28B that receives light and detects the light receiving position.
A thin plate 30 fixed to the lens frame 14 is inserted between 8A and the light receiving unit 28B. As shown in FIG. 2, the thin plate 30 is formed with a slit 30A in the optical axis direction. When the lens frame 14 is vertically displaced by the actuator 24, the position of the slit 30A is vertically displaced. Has become. Therefore, the LED light emitting unit 28
By emitting light from A and detecting the position of the light passing through the slit 30A with the light receiving unit 28B, the vertical position of the anti-vibration lens 10 fitted and held on the lens frame 14 can be detected. In addition, the control unit 50 includes the LED light emitting unit 2
Power is supplied to the LED 8A to cause the LED to emit light, and information indicating the light receiving position is acquired from the light receiving section 28B to detect the vertical position of the anti-vibration lens 10.

Similarly, on the right side of the outer holding frame 18, there is provided a position detecting section 32 composed of the same LED light emitting section 32A and light receiving section 32B as described above, between the LED light emitting section 32A and the light receiving section 32B. The thin plate 3 fixed to the inner holding frame 16
4 is inserted. The thin plate 34 includes the thin plate 30 (FIG. 2).
Like the above), a slit in the optical axis direction is formed,
When the inner holding frame 16 is displaced in the left-right direction by the actuator 26, the position of this slit is displaced in the left-right direction. As described above, the control unit 50
Supply power to the ED light emitting unit 32A to cause the LED to emit light,
The position of the light passing through the slit of the thin plate 34 is determined by the light receiving portion 32B.
The position of the inner holding frame 16 in the left-right direction, that is, the position of the anti-vibration lens 10 in the left-right direction is detected.

The configuration of the position detectors 28 and 32 for detecting the positions of the image stabilizing lens 10 in the vertical and horizontal directions is not limited thereto, and other position sensors may be used. Angular velocity sensors 36 and 38 are fixed to the lower part and the left part of the lens barrel 10. These angular velocity sensors 36 and 38 detect vertical and horizontal vibrations transmitted to the lens barrel 12, respectively. Information detected by these angular velocity sensors 36 and 38 is output to the control unit 50. You.

The control unit 50 controls the angular velocity sensors 36, 3
The shake of the lens barrel 12 is detected based on the information transmitted from the control unit 8, and the position (correction position) where the anti-shake lens 10 for preventing image shake should be moved is sequentially calculated based on the shake. Then, based on information from the light receiving sections 28B and 32B of the position detecting sections 28 and 32 installed on the inner holding frame 16 and the outer holding frame 18, respectively, the upper, lower, left and right positions of the image stabilizing lens 10 are detected. The actuator 24 and the actuator 26 installed on the holding frame 16 and the outer holding frame 18 are respectively driven to move the image stabilizing lens 10 to the calculated correction position. As a result, the anti-vibration lens 10 moves the lens barrel 1
2 is appropriately moved to a position for preventing image blur due to shake.

The operation of the vibration isolating unit configured as described above will be described. When the angular velocity sensors 36 and 38 detect the shake of the lens barrel 12, the actuators 24 and 26 operate based on the information, and the image stabilizing lens 10 corrects the image shake in a plane orthogonal to the photographing optical axis. Move to position.
For example, the angular velocity sensor 36 installed below the lens barrel 12
When the vertical vibration information is input to the control unit 50 from
The control unit 50 calculates a vertical correction position where the image stabilizing lens 10 should be moved in order to prevent image blurring. Then, the actuator 24 installed on the inner holding frame 16 is driven while detecting the vertical position of the image stabilizing lens 10 based on information from the light receiving unit 28B of the position detecting unit 28 installed on the inner holding frame 16. The image stabilizing lens 10 is moved to a correction position obtained by calculation.

On the other hand, when vibration information in the left-right direction is input from the angular velocity sensor 38 provided on the side of the lens barrel 12 to the control unit 50, the control unit 50 controls the anti-vibration lens 10 to prevent image blur. Calculate the horizontal correction position to be moved. Then, the position detection unit 32 installed on the outer holding frame 18
The actuator 26 mounted on the outer holding frame 18 is driven to move the anti-vibration lens 10 to the calculated correction position while detecting the horizontal position of the anti-vibration lens 10 based on the information from the light receiving unit 32B. .

The two angular velocity sensors 3 of the lens barrel 10
When the vibration information in the up / down / left / right direction is input to the control unit 50 from 6, 38, the control unit 50 separates the vibration information into components in the up / down direction and the left / right direction, and The lens 10 is simultaneously corrected. As described above, in the above embodiment, the lens frame 14 and the inner holding frame 16 are movably supported by the guides 19A, 19B, 20A, and 20B in the directions orthogonal to each other (vertical and horizontal directions), and are moved by the actuators 24 and 26. Although the lens frame 14 and the inner holding frame 16 are driven in the direction in which the lens frame 14 can be freely moved, the lens frame 14 and the inner holding frame 16 do not necessarily have to be movable in a direction orthogonal to the lens frame. It is not necessary to support the inner holding frame 16 movably in the left and right directions in the direction, and at least the lens frame 14 and the inner holding frame 16 are movably supported in different directions, and the direction in which the actuator is movably supported by the actuator. What is necessary is just to drive the lens frame 14 and the inner holding frame 16.

In the above embodiment, the lens frame 14
The inner holding frame 16 is provided with an actuator 24 that moves the lens frame 14 in the vertical direction and a position detector 28 that detects the vertical position of the lens frame 14. Can also be provided. Similarly, the actuator 26 and the position detector 32 provided on the outer holding frame 18 can be provided on the inner holding frame 16.

The anti-vibration unit described in the above embodiment can be applied to any camera. When the camera body and the lens device are detachable, the control unit 50 is attached to the lens device.
Can be installed to cause the lens device to execute image stabilization control independently of the camera body.

[0021]

As described above, according to the image stabilizing unit for a camera according to the present invention, the lens frame of the image stabilizing lens is moved in the first direction in the plane perpendicular to the optical axis by the first frame outside the lens frame. And the first frame is movably supported by a second frame outside the first frame in a second direction different from the first direction.
Since the driving means for moving the lens frame and the first frame in the first and second directions respectively are installed in the lens frame, the first frame or the second frame, the configuration is simple and the number of parts is small, Assembling is easy, and the size and cost of the device can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a lens barrel of a camera to which a camera vibration isolation unit according to the present invention is applied.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Anti-vibration lens 14 ... Lens frame 16 ... Inner holding frame 18 ... Outer holding frame 19A, 19B, 20A, 20B ... Guide 24, 26 ... Actuator 28, 32 ... Position detection part 36, 38 ... Angular velocity sensor 50 ... Control part

Claims (1)

[Claims] An image stabilizing unit for a camera for correcting an image blur caused by vibration applied to a lens barrel by moving an image stabilizer lens installed in the lens barrel in a plane orthogonal to an optical axis. A first frame disposed outside the lens frame of the vibration-proof lens and movably supporting the lens frame in a first direction perpendicular to the optical axis; and a first frame disposed outside the first frame; A second frame that movably supports the first frame in a second direction that is perpendicular to the optical axis and that is different from the first direction; and installed on the first frame or the lens frame. A first driving unit that moves the lens frame in the first direction with respect to the first frame based on the vibration applied to the lens barrel; and a second frame or the first frame. The first frame is installed on a frame, and the first frame is moved to the second frame based on vibration applied to the lens barrel. And a second driving means for moving the frame in the second direction with respect to the frame.