JPH05257089A - Vibration proof device for camera - Google Patents

Abstract

PURPOSE:To obtain a vibration proof device for a camera, capable of reducing the probability of the occurrence of the mulfunction of the vibration proof device, and prolonging the service life of the battery of the vibration proof device by controlling the ON/OFF of the drive of a lens with a driving motor moving a correction optical system, based on zoom information from a zoom resistance plate attached to a photographic lens group, and limiting a region where the vibration proof device is actuated to a region requiring a vibration proof function. CONSTITUTION:When the photographic lens group of a range where the viewing angle of a telephoto side is 6 deg. and the viewing angle of a wide-angle side is 60 deg., is used, and the zoom information showing a fact that the viewing angle is 10 deg. or below, in the zooming of the photographic lens group 12, is inputted to a CPU 34 from the zoom resistance plate 30, the ON-signal for the drive of the lens is transmitted to the driving motor 72 from the CPU 34, and the OFF-signal is transmitted when the viewing angle exceeds 10 deg.. In other words, the region where the viewing angle is 10 deg. or below, the vibration proof device is actuated.

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 for correcting image blur on the image plane is arranged in front of or behind the photographing lens group, and a drive motor for moving the correction optical system lens is connected to the correction optical system lens. A CPU is connected to the drive motor, and the lens drive of the drive motor is controlled by this CPU. An acceleration sensor that detects the magnitude and direction of camera vibration is also connected to the CPU.

The CPU calculates a correction movement amount to be given to the correction optical system lens on the basis of the information from the acceleration sensor, and outputs information indicating the calculated correction movement amount to the drive motor. Then, the drive motor moves the correction optical system lens based on the information by an amount that cancels the movement of the image caused by the camera shake.

[0004]

However, since the conventional image stabilizing device for a camera controls the image stabilizing function in the entire range from the wide-angle side to the telephoto side during zooming of the photographing lens group, There are disadvantages that the vibration proof device is more likely to malfunction and the battery life of the vibration proof device is shortened.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a camera anti-vibration device capable of preventing malfunction of the anti-vibration device and extending the service life of the battery. To do.

[0006]

According to the present invention, there are provided a correction optical system lens for correcting an image blur on an image plane, a camera shake detection means for detecting the magnitude and direction of camera vibration, and a camera shake detection means. Calculation means for calculating the correction movement amount to be given to the correction optical system lens based on the information of the above, driving means for moving the correction optical system lens based on the information from the calculation means, and detection of the movement amount of the moving lens group. Zoom detecting means for detecting zoom information, and ON / OFF of the driving means is controlled based on zoom information from the zoom detecting means.

[0007]

According to the present invention, the area where the image stabilizing function of the image stabilizing apparatus of the camera is required is the telephoto side area, and the image stabilizing effect is conspicuous even if the image stabilizing apparatus is operated in the wide angle side area. Focusing on the fact that there is not, the on / off of the drive means for moving the correction optical system lens is controlled based on the zoom information from the zoom detection means attached to the photographing lens group.

Specifically, in the case of using a photographing lens group having an angle of view of 6 ° on the tele side and an angle of view of 60 ° on the wide side, when the angle of view becomes 10 ° or less when the photographing lens group is zoomed, the detecting means is detected. Sends an ON signal to the driving means, and sends an OFF signal when the angle of view exceeds 10 °. That is, the image stabilizing device is operated in the telephoto side region where the angle of view is 10 ° or less. With this, in the image stabilizing device of the camera of the present invention, since the region in which the image stabilizing device operates is limited to the region requiring the image stabilizing function, it is possible to reduce the probability of malfunction of the image stabilizing device. The service life of the battery of the vibration isolator can be extended.

[0009]

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. FIG. 1 is a layout view of a camera lens group to which a camera anti-vibration device according to the present invention is applied. A photographing lens group 12 is provided in front of the image forming surface 10, and a vibration isolation optical system is provided in front of the photographing lens group 12. The lens groups 14 are arranged in order.

As shown in FIG. 2, a plurality of zoom lens groups 18 are inserted into the zoom cam barrel 16 of the taking lens group 12 while being supported by a pair of support rods 20, 20. A pin (not shown) formed on the frame 18a is fitted into a cam groove 16a formed on the zoom cam barrel 16. Accordingly, when the zoom cam barrel 16 is rotated, the zoom lens group 18 moves along the optical axis 2 along the groove 16a.
2 Move in the front-back direction to zoom the image. Incidentally, the taking lens group 12 of the present embodiment is, for example, one having an angle of view on the tele (telephoto) side of 6 ° and an angle of view of the wide (wide angle) side of 60 ° during zooming.

A concave cutout 24 is formed at the rear end of the zoom cam barrel 16, and a projection 26a of a zoom drive wheel 26 is engaged with the cutout 24. As a result, the zoom drive wheel 26 rotates together with the zoom cam barrel 16.
A zoom brush 28 formed of a conductive member is fixed to the rear end of the zoom drive wheel 26. Zoom brush 28
Is slidably contacted with a semi-arcuate zoom resistance plate 30 fixed to the camera body side, and slides on the zoom resistance plate 30 as the zoom drive wheel 26 rotates.

The zoom resistance plate 30 is connected to the CPU 34 via a cable 32, and the resistance value changes as the zoom brush 28 slides, that is, the photographing lens group 1.
The zoom information of 2 is output to the CPU 34 as a resistance value. An acceleration sensor 38 is connected to the CPU 34 via a cable 36, and the magnitude and direction of the vibration of the camera body detected by the acceleration sensor 38 are output to the CPU 34.

The anti-vibration optical system lens group 14 is shown in FIGS.
As shown in FIG. 3, the front lens group 40 and the correction optical system lens 42 for correcting the image blur on the image plane 10 are included. The correction optical system lens 42 is held by the lens holding frame body 44, as shown in FIG. The lens holding frame body 44 is swingably supported by an annular body 50 via a pair of pins 46 and 48 that are planted in the horizontal direction on the outer peripheral surface of the lens holding frame body 44. As a result, the lens holding frame 44 is moved to the horizontal axis 52.
Is supported by the annular body 50 so as to be swingable.

Further, the annular body 50 can swing on a camera body 58 shown by a chain double-dashed line in FIG. 3 via a pair of pins 54 and 56 that are vertically implanted on the outer peripheral surface of the annular body 50. Supported. As a result, the annular body 50 has the vertical axis 60.
The camera body 58 is swingably supported around (FIG. 2). As shown in FIG. 3, the lens holding frame body 44 has a cam 62 in contact with the right end surface 44a of the lens holding frame body 44. The cam 62 is pressed against the lens holding frame body 44 by the urging force of a spring 64 having one end attached to the right end surface 44a of the lens holding frame body 44. The cam 62 can be rotated by the driving force from the driving motor 66 shown in FIG.

As shown in FIG. 3, the annular body 50 has a cam 68 in contact with the right end surface 50a of the annular body 50. The cam 68 is pressed against the annular body 50 by the biasing force of a pair of springs 70, 70 of which one end is attached to the right end surface 50a of the annular body 50. The cam 68 can be rotated by the drive force from the drive motor 72 shown in FIG.

The drive motors 66 and 72 are cable 7
It is connected to the above-mentioned CPU 34 via 4, 76. Next, C of the camera anti-vibration device constructed as described above
A control method by the PU 34 will be described. CPU34
Detects that the angle of view is 10 ° or less from the zoom information input when the photographing lens group 12 is zoomed, transmits a lens drive ON signal to the drive motors 66 and 72 via the cables 74 and 76, When the angle of view exceeds 10 °, a lens drive OFF signal is transmitted to the drive motors 66 and 72.

That is, when the acceleration sensor 38 detects camera shake during shooting within the range of the angle of view of 10 ° or less, the CPU 34 operates the drive motors 66 and 72 based on the camera shake information, and the cam 62. , 68 are rotated to move the correction optical system lens 42 by an amount that cancels the movement of the image caused by camera shake. Specifically, when the cam 62 of the drive motor 66 is rotated clockwise from the position shown in FIG. 3, the lens holding frame body 44 is pushed by the cam 62 to move the horizontal shaft 52 (FIG. 1). It swings to the left as the center. Further, when the cam 62 is rotated counterclockwise in the drawing from the position shown in FIG. 3, the lens holding frame 44 swings rightward about the horizontal shaft 52 by the urging force of the spring 64.

On the other hand, when the cam 68 of the drive motor 72 is rotated clockwise from the position shown in FIG. 3, the annular body 50 is urged by the springs 70, 70 so that the vertical shaft 60 (FIG. 2).
Swing to the left around. When the cam 68 is rotated counterclockwise in the drawing from the position shown in FIG. 3, the annular body 50 is pushed by the cam 68 and swings rightward about the vertical shaft 60. When the drive motors 66 and 72 are simultaneously rotated in the forward and reverse directions, the lens holding frame body 44 can be swung in an arbitrary direction. Therefore, the correction optical system lens 42 is moved in the amount and the direction in which the movement of the image caused by the camera shake is canceled. ..

Therefore, in this embodiment, attention is paid to the fact that the area where the image stabilizing function of the image stabilizing apparatus of the camera is required is the telephoto side area, and the area where the image stabilizing apparatus operates requires the image stabilizing function. Since it is limited to the area, it is possible to reduce the probability of malfunction of the image stabilization device and to reduce the probability of malfunction of the image stabilization device, as compared with the conventional camera image stabilization device that controls the operation of the image stabilization device in all areas. The service life of the battery can be extended.

In the present embodiment, the ON signal for driving the lens of the drive motors 66 and 72 is transmitted when the angle of view becomes 10 ° or less. However, the present invention is not limited to this angle of view, and it is not limited to this angle of view. It depends on the type. Further, the structure of the vibration-proof optical system lens group 14 is not limited to that of the present embodiment, and may have another structure.

[0021]

As described above, according to the image stabilizing apparatus for a camera according to the present invention, the driving means for moving the correction optical system lens is turned on / off by the zoom detecting means attached to the photographing lens group. Control based on zoom information,
Since the area in which the anti-vibration device operates is limited to the area where the anti-vibration function is required, the probability of malfunction of the anti-vibration device can be reduced and the service life of the battery of the anti-vibration device can be extended. ..

[Brief description of drawings]

FIG. 1 is an explanatory view showing a mounting position of a vibration isolation device for a camera according to the present invention.

FIG. 2 is a perspective view showing an embodiment of a vibration isolation device for a camera according to the present invention.

FIG. 3 is a partial cross-sectional view of a vibration isolation mechanism applied to a camera vibration isolation device according to the present invention.

[Explanation of symbols]

 10 ... Image forming surface 12 ... Shooting lens group 14 ... Anti-vibration optical system lens group 16 ... Zoom cam barrel 26 ... Zoom drive wheel 30 ... Zoom resistance plate 34 ... CPU 38 ... Acceleration sensor 42 ... Correction optical system lens 44 ... Lens holding frame Body 50 ... Annular body 62, 68 ... Cam 66, 72 ... Drive motor

Claims (1)

[Claims] 1. A correction optical system lens for correcting image blur on an image plane, a camera shake detection unit for detecting the magnitude and direction of camera vibration, and the correction optical system based on information from the camera shake detection unit. Calculating means for calculating a correction movement amount to be given to the system lens, driving means for moving the correction optical system lens based on information from the calculating means, and zoom detecting means for detecting zoom information for detecting the movement amount of the moving lens group. And a vibration control device for a camera, wherein ON / OFF of the drive unit is controlled based on zoom information from a zoom detection unit.