JPH06281889A - Optical camera-shake correcting device - Google Patents

Abstract

PURPOSE:To optically compensate the shake of a video camera caused by hand shake and vibration, etc. CONSTITUTION:An optical camera-shake correcting device 10 is provided with a set of a concave lens 11 and a convex lens 12 located in a video camera 1 and controlled in the direction for canceling the shaken amount in accordance with the shaken amount of the video camera 1 caused by hand shake or vibration. The concave curved surface 11b of the concave lens 11 and the convex curved surface 12a of the convex lens 12 are made to confront each other so as to fit both curved surfaces 11b, 12a, the centers of curvature 0 of the radii of curvature R of both concave and convex surfaces are made coincident with each other and by rotating either of the lenses 11, 12 or both of the lenses 11, 12 around the center of curvature 0 in the state of surface setting, the direction of the optical axis L is compensated between the concave lens 11 and the convex lens 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical shake correcting apparatus which is applied to a video camera or the like and optically corrects the shake of the video camera caused by camera shake or vibration.

[0002]

2. Description of the Related Art Optical shake correction apparatuses applied to video cameras and the like have been actively developed in recent years and have various structural forms. As an example thereof, an optical shake correction device that detects the shake amount of a video camera caused by camera shake, vibration, etc. and controls an active prism provided in front of an imaging lens in a direction of canceling the shake amount is Nikkei Electronics 1992. .7.6 (no. 559). Here, the conventional optical shake correction apparatus 110 disclosed above will be briefly described with reference to FIGS. 4 (A) and 4 (B).

4A and 4B are block diagrams showing a conventional optical shake correction apparatus. FIG. 4A shows a state without shake correction, and FIG. 4B shows a state with shake correction. .

The conventional optical shake correction device 110 shown in FIGS. 4A and 4B is provided in, for example, a well-known video camera 100. This optical image stabilizer 110 is provided with an active prism 111, which is controlled in accordance with the amount of shake of the video camera 100 caused by camera shake, vibration, etc., in front of the image pickup lens 101 in the video camera 100, and also has an image pickup lens. CCD that forms a subject image behind 101
An image sensor 102 is provided. Among the above-mentioned constituent members, the active prism 111 joins the front and rear flat glass plates 111a and 111b with a bellows 111c, and also the bellows 111c.
A liquid 111d having a refractive index substantially equal to that of glass is filled therein. This active prism 111 is a video camera 10
Depending on the amount of shake of 0, the bellows 11
By expanding and contracting 1c, front and rear glass plates 111a, 111b
The orientation of the optical axis L can be changed by controlling the inclination of the.

Here, as shown in FIG. 4A, if the video camera 100 is installed in a stationary state, for example, if the video camera 100 is installed in a straight line with respect to the subject H, the video camera 100 will be described. Since a shake amount is hardly generated in a shake amount detection sensor (not shown) provided inside, the two glass plates 111a and 111b forming the active prism 111 are controlled to be substantially parallel to each other. Therefore, the CCD image sensor 102
When the subject H is viewed from the substantially central portion side, the optical axis L ₁ when there is no shake heads toward the subject H from the CCD image pickup element 102 to the active prism 111 in a substantially straight line. An image is formed at a desired position within the element 102, that is, generally at a substantially central portion of the CCD image pickup element 102.

On the other hand, as shown in FIG. 4B, the video camera 100 is tilted, for example, upward with respect to the subject due to camera shake, vibration, etc., and the shake amount is detected by a shake amount detection sensor (not shown). In the case, the active prism 111
The inclinations of the two glass plates 111a and 111b constituting the above are controlled according to the shake amount in a direction of canceling the shake amount. For example, with respect to the upward shake amount of the video camera 100, the glass plate 111a on the front side is tilted leftward as shown in the direction of canceling the shake amount. Therefore, when the subject H is viewed from the substantially central portion side of the CCD image pickup device 102, the optical axis L ₂ when there is a shake amount is turned by the glass plate 111a on the front side toward the subject H, and thus the shake occurs. Even if there is a subject image, the CCD image sensor 102 is passed through the active prism 111.
The image is formed in the substantially central portion of. Of course, although not shown, even if the shake amount is detected, if the active prism 111 is not controlled according to the shake amount, the subject image is formed at a desired position in the CCD image pickup element 102. It is needless to say that the image is not formed on the image in the CCD image pickup element 102, or is projected from the CCD image pickup element 102.

[0007]

By the way, in the above-mentioned conventional optical shake compensator 110, the amount of shake of the video camera 100 due to camera shake, vibration, etc. is detected, and the active prism 111 is moved in the direction of canceling this shake amount. Therefore, even if there is a shake, the image of the subject is transmitted through the active prism 111 to a desired position in the CCD image sensor 102,
That is, normally, an image can be formed in the substantially central portion of the CCD image pickup device 102, but there are problems such as the following items (1) to (3). ． As described above, the active prism 111 has two
Since the bellows 111c connecting the glass plates 111a and 111b is filled with the liquid 111d having a refractive index substantially equal to that of glass,
There is an unstable element such as leakage of the liquid 111d, and leakage prevention measures must be taken to prevent this. ． Since the liquid 111d in the active prism 111 is viscous, the responsiveness is delayed with respect to instantaneous camera shake, vibration, and the like. ． Since the two glass plates 111a and 111b forming the active prism 111 are connected via the bellows 111c, the correction (control) range of both glass plates 111a and 111b is the bellows 11.
1c limits you to a narrow range. ． The conventional optical image stabilizer 110 is added to the video camera 100.
When adopting, new technology is required for manufacturing,
In addition, the equipment for the optical shake correction device 110 becomes complicated.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a first lens having a concave curved surface having a predetermined curvature and a curvature substantially the same as the concave curved surface of the first lens. A second lens having a convex curved surface having a curved surface, and a concave curved surface of the first lens and a convex curved surface of the second lens are opposed to each other so that both curved surfaces are substantially aligned and the centers of curvature of both curved surfaces are matched, and A lens rotation unit that corrects the optical axis direction by rotating one or both lenses about the virtual center of curvature; and a shake amount detection unit that detects a shake amount due to camera shake, vibration, or the like. Provided is an optical shake correction device, comprising: a lens rotation control means for controlling rotation of the lens rotation means in a direction in which the shake amount is canceled by the shake amount detection means. To do .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The optical shake correcting apparatus according to the present invention will be described in detail below with reference to FIGS.

1A and 1B are views for explaining the operation principle of the optical shake correction apparatus according to the present invention. FIG. 1A shows a state without shake correction, and FIG. 1B shows a shake corrected state. FIG. 2 is a perspective view showing the optical shake correction apparatus, and FIG. 3 is a block diagram for explaining the control operation of the optical shake correction apparatus.

First, before entering into a detailed description of an optical shake correction apparatus 10 (hereinafter also referred to as an apparatus 10) according to the present invention, a basic operation principle of the apparatus 10 will be described with reference to FIG.
A description will be given using (A) and (B).

The optical shake correction apparatus 10 according to the present invention shown in FIGS. 1A and 1B is provided, for example, in a known video camera 1. This optical shake correction device 10
Is a combination of the first lens 11 and the second lens 12, which are controlled in a direction to cancel the shake amount of the video camera 1 caused by camera shake, vibration, etc. A CCD image pickup element 3 for forming a subject image is provided in front of the image pickup lens 2 and behind the image pickup lens 2.

The first lens 11 (hereinafter concave lens 11)
(Also referred to as), the flat surface 11a is formed on the subject H side,
A concave curved surface 11b having a predetermined curvature having a radius of curvature R is formed on the side opposite to the flat surface 11a to form a concave lens.

On the other hand, the second lens 12 (hereinafter also referred to as the convex lens 12) is convex with a predetermined curvature having a radius of curvature R substantially the same as the concave curved surface 11b on the side facing the concave curved surface 11b of the concave lens 11. A curved surface 12a is formed, and a flat surface 12b is formed on the side opposite to the convex curved surface 12a on the side of the imaging lens 2 to form a convex lens.

And, the concave curved surface 11b of the concave lens 11,
The convex curved surface 12a of the convex lens 12 is opposed to each other so that the curved surfaces 11b and 12a are substantially aligned with each other.
The center of curvature O of the curvature radius R of 1b and 12a is set to the imaging lens 2
And on the optical axis L passing through the center of the CCD image pickup device 3. As described above, in a state where the concave and convex curved surfaces 11b and 12a of both lenses 11 and 12 are aligned with each other, one of the concave lens 11 and the convex lens 12 (11), (12), or both of them is centered around the center of curvature O. By rotating the lenses 11 and 12 about the center of curvature O, the two lenses 11 and 12 rotate along the concave and convex curved surfaces 11b and 12a, respectively, so that the optical axis L is formed between the concave lens 11 and the convex lens 12. The orientation of can be corrected (converted).

Based on the principle of operation for correcting the direction of the optical axis L, when shake occurs in the video camera 1 due to camera shake, vibration, etc., the concave lens 11 and the convex lens 12 cancel the shake amount according to the shake amount. It is the technical idea of the optical shake correction device 10 to rotate (to cancel). At this time, the concave and convex curved surfaces 1 of both lenses 11 and 12
The centers of curvature O of the lenses 1b and 12a are the imaging lens 2 and the CCD.
Since the center of curvature O is a theoretical virtual point because it is set on the optical axis L passing through the center of the image sensor 3, it is equivalent to this center of curvature O and is provided without affecting the image formation of the subject H. The rotation fulcrum of the concave and convex lenses 11 and 12 will be described later.

In the above description, the set of rotatable concave lens 11 and convex lens 12 is provided in front of the image pickup lens 2, but the present invention is not limited to this. A method in which the convex lens 12 is combined in a small size in the imaging lens 2 as an imaging lens group may be considered. If the concave and convex curved surfaces 11b and 12a of the concave lens 11 and the convex lens 12 are maintained as described above,
The orientation of the optical axis L can be corrected by setting the front and rear of both lenses 11, 12 with respect to the subject H.

Next, as shown in FIG. 1A, if the video camera 1 is installed in a stationary state, for example, if the video camera 1 is installed in a straight line with respect to the subject H,
A shake amount detection sensor 5 described later provided in the video camera 1.
1 and 52 (FIG. 2) produce almost no shake, so that the center of the rotatable set of the concave lens 11 and the convex lens 12 forming the optical shake correction device 10 is the center of the image pickup lens 2 and the CCD image pickup device 3. It is controlled so as to be positioned substantially on the optical axis L (L ₁ ) passing through. Therefore, the concave curved surface 1 of the concave lens 11
1b and the convex curved surface 12a of the convex lens 12 are aligned over substantially the entire curved surface, and when the subject H is viewed from the substantially central side of the CCD image pickup element 3, the optical axis L when there is no shake amount
₁ is a substantially straight line from the CCD image pickup device 3 to the concave lens 11 toward the subject H, so that the image of the subject is at a desired position in the CCD image pickup device 3, that is, normally the CCD image pickup device 3.
The image is formed in the substantially central portion of.

On the other hand, as shown in FIG. 1B, the video camera 1 is tilted, for example, upward with respect to the subject H due to camera shake, vibration, etc., and shake amount detection sensors 51, 52 (FIG. 2).
When the shake amount is detected from the lens, either one of the pair of rotatable concave lens 11 and convex lens 12 (11), (12) or both lenses 11 constituting the optical shake correction device 10 is detected. , 12 are rotated about the center of curvature O in the direction of canceling the shake amount in accordance with the shake amount. In the figure, the concave lens 11 is fixed, and the convex lens 12 is rotated according to the shake amount in a direction in which the shake amount is canceled to the position shown in the figure, that is, for example, with respect to the upward shake amount of the video camera 1, the shake amount is increased. The convex curved surface 12a of the convex lens 12 is rotated around the center of curvature O along the concave curved surface 11b of the concave lens 11 and moved downward in the direction of canceling the amount. Therefore, when the subject H is viewed from the substantially central portion side of the CCD image pickup element 3, the optical axis L ₂ when there is a shake amount is refracted by the convex lens 12 and the concave lens 11 respectively, and then goes to the subject H, so that the shake occurs. Even if there is a subject image, both lenses 11 and 1
An image is formed on the substantially central portion of the CCD image pickup device 3 via 2.

The optical shake correction device 10 based on the above-described operation principle has the following advantages (1) to (3). ． Since the direction of the optical axis can be corrected only by the concave lens 11 and the convex lens 12, even if there is a shake amount due to camera shake, vibration, etc., the subject can be reliably photographed without degrading the image quality. ． When a shake amount due to camera shake, vibration, or the like occurs, only the concave lens 11 and the convex lens 12 are rotationally controlled in a direction to cancel the shake amount. Therefore, the lens rotating means can be configured easily and in a small size. Miniaturization can be achieved. ． The bellows used in conventional active prisms,
Since no viscous liquid or the like is used, the correction range of the optical axis can be freely set at the time of design, and the responsiveness of the optical axis correction operation becomes faster. ． Since the optical shake correction device 10 does not use a special component, the optical shake correction device 10 can be configured at low cost, requires no new technology associated with manufacturing, and can be simplified in equipment.

Next, the detailed configuration of the optical shake correction apparatus 10 will be described with reference to FIG. In the following description, the lens rotating means 20 for rotating the concave and convex (first and second) lenses 11 and 12 fixes and mounts the concave lens 11, and along the concave curved surface 11b of the concave lens 11. Although the convex curved surface 12a of the convex lens 12 is configured to rotate about the virtual center of curvature O, the concave lens 11 may be configured to rotate about the virtual center of curvature O as the convex lens 12 does. The good points are clear from the above description.

Here, in the optical shake correcting apparatus 10 shown in FIG. 2, the lens rotating means 20 for rotating the convex lens 12 along the concave lens 11 is a component member 21 described below.
~ 46. That is, the concave lens support member 21 for fixing the concave lens 11 is formed in an "L-shape" by using a metal plate, an aluminum material, or a resin material so that the front side surface 21b is vertically connected from the end of the bottom plate surface 21a. are, round hole 21b ₁ is bored in the front side surface 21b of the concave support member 21, and, a concave lens 1 in the round hole 21b ₁
1 is fitted and fixed. At this time, the front side surface 21b of the concave lens support member 21 is facing the subject H (FIG. 1), and the concave lens 1 fixed to the front side surface 21b.
The concave curved surface 11b of No. 1 is fixed toward the inside (left side) of the front side surface 21b in the figure. On the other hand, the convex lens 12
Circular convex lens holding members 22A, 22 facing each other
The upper and lower sides of the outer peripheral portion of the convex lens 12 are pressed by B. Further, both ends of the convex lens sandwiching members 22A and 22B which are separated from the outer peripheral portion of the convex lens 12 are opposed to each other with a convex lens vertical rotation supporting member 23A, which is opposed to each other with a space before and after the drawing.
23B is integrally sandwiched and coupled. That is, the convex lens vertical rotation support members 23A and 23B are formed by bending a part of upper and lower ends of the side surfaces 23a and 23b facing each other on the concave lens 11 side by using a sheet metal member or the like. Member 22A,
By fixing both ends of 22B, the convex lens 1
The second convex curved surface 12a faces the concave curved surface 11b of the concave lens 11 to face the concave and convex curved surfaces 11a and 12a. At this time, in terms of surface matching between the concave curved surface 11a and the convex curved surface 12a, it is ideal that the biconcave and convex curved surfaces 11b and 12a are perfectly in close contact with each other, but conversely, the concave concave curved surface 11a and the convex curved curved surface 12a are rotated. The concave lens is formed while forming a very slight gap (for example, a void of 0.5 mm or less) to the extent that it does not affect the optical performance, since scratches on the convex curved surfaces 11a and 12a may occur and scratches may occur. 11 to convex lens 12
Is rotatably supported.

Also, the convex lens vertical rotation support member 23A,
Inside the side surfaces 23a and 23b of 23B, the shafts 24A and 2
4B are fixed to face each other, and the axis connecting the axes 24A and 24B horizontally intersects the center of curvature O of the concave and convex curved surfaces 11b and 12a of the lenses 11 and 12 described above. Is set to.

Also, the convex lens vertical rotation support member 23A,
A convex lens horizontal rotation support member 25 is rotatably provided in the horizontal direction on the inside of the side surfaces 23a and 23b facing each other of 23B.
Numeral 5 is a sheet metal member which is used to connect the bottom plate surface 25a to the side surface 2
5b and 25c are vertically vertically connected to each other and are spaced apart from each other so as to face each other and are bent in a "U" shape. Then, the side surface 25b of the convex lens horizontal rotation supporting member 25 faces each other inside the side surface 23a of the lens vertical rotation supporting member 23A, and similarly the side surface 25c faces each other inside the side surface 23b. Furthermore, the convex lens vertical rotation support members 23A, 2
By fitting the shafts 24A and 24B fixed to 3B into the shaft holes (not shown) formed in the side surfaces 25b and 25c of the convex lens horizontal rotation support member 25 from the outside, the convex lens vertical rotation support members 23A and 23B are formed. It is rotatably supported in the vertical direction (arrows Z ₁ and Z ₂ directions) by the convex lens horizontal rotation support member 25. At this time, the convex lens vertical rotation support member 2
The shaft 24B is inserted between the side surface 23b of the 3B and the side surface 25c of the convex lens horizontal rotation supporting member 25 to insert the damper 26.
Is intervening. The damper 26 is formed by using a rubber member that is elastically displaceable, and maintains good servo characteristics during vertical rotation control of the convex lens 12.

A shaft 27 is fixed to the bottom plate surface 25a of the convex lens horizontal rotation supporting member 25 so as to protrude from the back surface of the bottom plate surface 25a at approximately the center thereof. The axis extending upward from the shaft 27 is set at a position perpendicular to the curvature center O of the concave and convex curved surfaces 11b and 12a of both lenses 11 and 12 described above. Further, the shaft 27 projecting from the back surface of the bottom plate surface 25a of the convex lens horizontal rotation support member 25 rotates in the horizontal direction (arrows X ₁ and X ₂ directions) to the bearing 28 fixed on the bottom plate surface 21a of the concave lens support member 21. It is movably supported. At this time, a damper 29 is interposed between the back surface of the bottom plate surface 25a and the bearing 28 by inserting the shaft 27. This damper 29 is also formed by using a rubber member that is elastically displaceable, and maintains good servo characteristics during horizontal rotation control of the convex lens 12.

Further, the shaft 27 fixed to the convex lens horizontal rotation supporting member 25 is inserted into the bearing 28 and then protrudes to the back surface of the bottom plate surface 21a of the concave lens supporting member 21 to form the spacer 3
The horizontal rotation position detection plate 32 having the pin 31 fixed to the 0 and the back surface is inserted, and the end portion of the shaft 27 is vertically tightened by the snap ring 34 without rattling. At this time, the horizontal rotation position detection plate 32 is configured to rotate integrally with the shaft 27 by frictional force, that is, the convex lens horizontal rotation support member 2
It rotates together with 5.

With the above structure, the convex lens vertical rotation support members 23A and 23B supporting the convex lens 12 are perpendicular to the convex lens horizontal rotation support member 25 about the axes 24A and 24B (arrows Z ₁ and Z _2). Direction), and the convex lens vertical rotation support members 23A and 23B.
The convex lens horizontal rotation support member 25 is integrated with the concave lens support member 21 in the horizontal direction (arrow X ₁ ,
It is rotatably supported in the X ₂ direction). Therefore, the rotation fulcrum of the convex lens 12 is provided in a range in which each rotation axis does not affect the image formation of the subject H (FIG. 1), and the axis 24
This is equivalent to a state of rotating around an imaginary center of curvature O where the axes of A and 24B and the axis of the shaft 27 intersect. Furthermore,
A horizontal rotation position detection element 33 using a Hall element is attached to the back surface of the bottom plate surface 21a of the concave lens support member 21 so as to face the pin 31 fixed to the horizontal rotation position detection plate 32. On the other hand, on the side surface 25b of the convex lens horizontal rotation supporting member 25, a vertical horizontal rotation position detecting element 35 using a Hall element is attached below the shaft 24A, and the convex lens vertical rotation supporting member 35 is opposed to this. The pin 36 is fixed to the inside of the side surface 23a of the member 23A. here,
When the pin 36 fixed to the convex lens vertical rotation support member 23A rotates about the axis 24A in the directions of the arrows Z ₁ and Z ₂ , the pin 36 blocks the magnetic field of the Hall element, and the vertical rotation position detection element 35 is removed. The vertical rotation angle α ₁ (FIG. 3) to be controlled by the convex lens 12, which will be described later, is output, while the convex lens horizontal rotation supporting member 25 is integrated with the horizontal rotation position detection plate 32 in the same manner as described above. When the pin 31 rotates about the shaft 27 in the directions of the arrows X ₁ and X ₂ , the pin 31 blocks the magnetic field of the Hall element, and the horizontal rotation position detection element 33 becomes a control target of the convex lens 12 described later. The horizontal rotation angle β ₁ (FIG. 3) is output. Therefore, the output vertical and horizontal rotational angles α ₁ and β ₁ indicate the vertical and horizontal rotational positions at the time when the convex lens 12 is rotationally controlled.

Next, the convex lens 12 is moved vertically (arrows Z ₁ and Z ₂ directions) and horizontally (arrows X ₁ and X ₂ directions).
The drive source that is rotated in the direction will be described. That is, the vertical rotation coil support plate 40A and the horizontal rotation coil support plate 40B project and are attached to the rear of the side surface 25b and the bottom plate surface 25a of the convex lens horizontal rotation support member 25.
Coils (41A, 41A), (41B, 41B) are assembled and wound on both surfaces of the vertical and horizontal coil support plates 40A, 40B. Incidentally, the coils 41A, 41
Both B are shown only on one side.

In addition, a vertical rotation magnet assembly 42A corresponding to the vertical rotation coil support plate 40A is formed in the side surface 23a of the convex lens vertical rotation support member 23B.
It mounted from the outside of a _1, whereas the horizontal rotating magnet assembly 42B in correspondence with the horizontal rotating coil support plate 40B is mounted on the bottom plate surface 21a of the concave lens support member 21. In the vertical rotation magnet assembly 42A and the horizontal rotation magnet assembly 42B, a lower yoke 44 and a magnet 45 are sequentially stacked below a support base 43, and an upper yoke 46 is separated from the magnet 45 by an upper yoke 46. Are integrally assembled above each other.

Here, the vertical rotation coil support plate 40A is inserted between the magnet 45 and the upper yoke 46 of the vertical rotation magnet assembly 42A, and the coil 41A (not shown) close to the magnet 45. When the coil current Iz is applied to the shaft 24, the convex lens vertical rotation support members 23A and 23B move according to the direction of the coil current Iz.
Along with the vertical rotation around A and 24B (arrows Z ₁ and Z ₂ directions), a counter electromotive force is generated in the coil 41A on the opposite side away from the magnet 45, which is a control target of the convex lens 12 described later. The directional angular velocity ψ ₁ (FIG. 3) is output. Therefore, the convex lens 12 supported by the convex lens vertical rotation support members 23A and 23B is about ± 2 ° to ± 5 ° with respect to the horizontal plane including the optical axis L passing through the centers of the imaging lens 2 and the CCD imaging device 3. Vertical direction (arrow Z
It is set at the time of design so that it can rotate in the ₁ and Z ₂ directions).

Similarly to the above, the coil support plate 4 for horizontal rotation is used.
0B is inserted between the magnet 45 and the upper yoke 46 of the horizontally rotating magnet assembly 42B. When the coil current Ix is applied to the coil 41B (not shown) close to the magnet 45, the coil current Ix The convex lens horizontal rotation support member 25 rotates in the horizontal direction (arrows X ₁ , X ₂ directions) around the shaft 27 according to the direction, and a counter electromotive force is generated in the coil 41B on the opposite side away from the magnet 45. The horizontal angular velocity ω ₁ (FIG. 3) to be controlled by the convex lens 12, which will be described later, is output. Therefore, the convex lens 12 supported by the convex lens horizontal rotation supporting member 25 is horizontal by about ± 2 ° to ± 5 ° with respect to the vertical plane including the optical axis L passing through the centers of the imaging lens 2 and the CCD imaging device 3. It is set at the time of design so that it can rotate in the directions (arrows X ₁ and X ₂ directions).

Further, inside the video camera 1, a shake amount detecting means 50 for detecting the shake amount caused by hand shake, vibration, etc. is provided. The shake amount detecting means 50
Is a vertical shake amount detection sensor 51 that detects a shake amount in the vertical direction using a known angular velocity sensor in this embodiment.
And a horizontal shake amount detection sensor 52 for detecting the shake amount in the horizontal direction. Incidentally, in the embodiment, vertical,
Although angular velocity sensors are used as the horizontal shake amount detection sensors 51 and 52, known angle sensors may be used.

2 and 3, the lens rotation control means for rotating the convex lens 12 in the vertical direction (arrows Z ₁ and Z ₂ directions) and the horizontal direction (arrows X ₁ and X ₂ directions). 60 will be described.

First, the vertical and horizontal shake amount detection sensor 5
The vertical and horizontal angular velocities ψ ₀ , ω which are control targets of the convex lens 12 through the inverting circuit 61 in order to convert the angular velocity information generated by the hand shake, the vibration, etc. On the other hand, ₀ is obtained and, on the other hand, the vertical and horizontal rotation angles α ₀ and β ₀ to be the control targets of the convex lens 12 are obtained from the inversion circuit 61 through the integration circuit 62. After that, the obtained control target value of the convex lens 12 is applied to the A / D converter 6 in the microcomputer 63.
3a converts the analog value into a digital value and inputs it to the control unit 63b in the microcomputer 63. On the other hand, convex lens 1
The vertical / horizontal angular velocities ψ ₁ , ω ₁ and the coil currents Iz, Ix to be controlled by _{No. 2} are vertical and horizontal rotation coil support plates 40A, 40B (FIG. 2) to the A / D in the microcomputer 63.
Is input to the control unit 63b via the converter 63c, and
The vertical and horizontal rotation angles α ₁ to be controlled by the convex lens 12,
β ₁ is a control unit 63b from the vertical and horizontal rotational position detecting elements 35 and 33 via the A / D converter 63c in the microcomputer 63.
Has been entered in. Then, the control unit 6 in the microcomputer 63
3b outputs the coil voltages Vz and Vx from the control unit 63b in the microcomputer 63 so as to approach the control target value while comparing the control target value and the control target value, respectively, and outputs the coil voltages Vz and Vx in the microcomputer 63. After converting the digital value to the analog value by the D / A converter 63d, the width is increased by the widening device 64 and the vertical and horizontal turning coil support plates 40A,
It is applied to the drive coil (41A, 41B) of 40B. Therefore, the convex lens vertical rotation support members 23A, 23B
Rotates to a vertical rotation angle α (approximately α ₀ ) which is a control amount, while the convex lens horizontal rotation support member 25 rotates to a horizontal rotation angle β (approximately β ₀ ) which is a control amount.

In the lens rotation control means 60 having the above structure, only the convex lens 12 is rotationally controlled so as to cancel out the shake amount in accordance with the shake amount caused by hand shake, vibration, etc., so that control with good responsiveness is achieved. It can be performed.
Of course, the same effect can be obtained when controlling the concave lens 11.

[0036]

According to the optical shake compensator according to the present invention described in detail above, the concave curved surface of the first (concave) lens and the second curved surface
(Convex) The convex curved surface of the lens is made to face each other and both curved surfaces are substantially aligned, the centers of curvature of both curved surfaces are matched, and either one lens or both lenses is shaken by a hand shake or vibration. Since the optical axis direction is corrected by rotating around the virtual center of curvature, as a result, the optical axis direction can be corrected only by the first lens and the second lens, and the shake amount due to camera shake, vibration, etc. Even if there is, the subject can be shot reliably without degrading the image quality. Further, when a shake amount due to camera shake, vibration, or the like occurs, only the first lens and the second lens are controlled to rotate in the direction of canceling the shake amount, so that the lens rotating means can be configured easily and in a small size. The miniaturization of the device can be achieved. In addition, since the bellows and viscous liquid used in the conventional active prism are not used at all, the correction range of the optical axis can be freely set at the time of design, and the responsiveness of the optical axis correction operation is fast. Become. Furthermore, since the optical shake correction apparatus according to the present invention does not use any special constituent member, it can be constructed at low cost and requires no new technology associated with manufacturing, and the equipment can be simplified.

[Brief description of drawings]

1A and 1B are diagrams for explaining the operation principle of an optical shake correction apparatus according to the present invention, in which FIG. 1A shows a state without shake correction, and FIG. 1B shows a shake corrected state. It is a figure.

FIG. 2 is a perspective view showing an optical shake correction apparatus according to the present invention.

FIG. 3 is a block diagram for explaining a control operation of the optical shake correction apparatus according to the present invention.

4A and 4B are configuration diagrams showing a conventional optical shake correction apparatus, in which FIG. 4A shows a state without shake correction, and FIG. 4B shows a state with shake correction.

[Explanation of symbols]

1 ... Video camera, 10 ... Optical shake correction device, 11 ...
1st lens (concave lens), 11b ... concave curved surface, 12 ... 2nd
Lens (convex lens), 12a ... Convex curved surface, 20 ... Lens rotation means, 50 ... Shake amount detection means, 60 ... Lens rotation control means, O ... Curvature center.

Claims (1)

[Claims] 1. A first lens having a concave curved surface having a predetermined curvature, a second lens having a convex curved surface having substantially the same curvature as the concave curved surface of the first lens, and a concave lens of the first lens. The curved surface and the convex curved surface of the second lens are opposed to each other so that the curved surfaces are substantially aligned with each other and the curvature centers of the curved surfaces are matched with each other, and either one or both lenses are rotated about the virtual curvature center. A lens rotating means for correcting the optical axis direction by moving, a shake amount detecting means for detecting a shake amount due to camera shake, vibration, etc., and a direction for canceling the shake amount according to the shake amount from the shake amount detecting means. An optical shake correction apparatus, further comprising: a lens rotation control means for controlling rotation of the lens rotation means.