JPH1096968A - Optical axis angle variable device and deflection correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection correcting device capable of solving a problem of interference with an image-pickup optical system, even when a deflection correcting device is applied to a hand shake correction device using an optical axis angle variable mechanism using afocal optical system as an optical axis angle variable mechanism. SOLUTION: A piano-concave lens 211(P) and a piano-convex lens 211(Y) constitute an afocal optical system, and a rotational axis 212(P) pivots the piano-concave lens 211(P) so that it freely rotates in a plane vertical to the optical axis, while a rotational axis 212(Y) pivots the piano-convex lens 211(Y) so that it freely rotates in a plane vertical to the optical axis. Turning angle detectors 213(P), 213(Y), deflection detectors 215(P), 215(Y), an arithmetic operation part 220, driving circuits 230(P), 230(Y), and driving motors 213(P), 213(Y) drive to rotate the lenses 211(P), 211(Y) for correcting hand shake, and also drive to rotate the other lenses 211(Y), 211(P) for offsetting orthogonal error generated by the former rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image stabilizing device suitable for a camera image stabilizing device provided in, for example, a camera-integrated video tape recorder (hereinafter referred to as "video camera"). The present invention also relates to an optical axis angle variable device suitable for realizing the shake correction device.

[0002]

2. Description of the Related Art In recent years, a video camera for broadcasting business has been required to have a camera shake correction device for suppressing a shake of a captured image due to a camera shake due to a decrease in skilled cameramen and the like.

In order to meet this demand, it is conceivable to use a camera shake correction device used in a video camera for general consumers.

[0004] As a camera shake correction device used in a video camera for general consumers, an optical camera shake correction device is conventionally known. This optical image stabilizer corrects a shake of a captured image due to camera shake by controlling a transmitted optical axis angle based on the magnitude (angular displacement) of camera shake of a video camera. Here, the transmitted light axis angle is the angle of the output side optical axis with respect to the incident side optical axis of the optical system.

In order to realize this optical camera shake correction device, an optical axis angle variable device capable of correcting the transmitted optical axis angle is required according to the transmitted optical axis angle correction request. In order to realize the optical axis angle varying device, an optical axis angle varying mechanism capable of changing the transmitted optical axis angle is required.

As the optical axis angle variable mechanism, conventionally, a mechanism using a vertical angle variable prism and a mechanism using an afocal optical system are known.

As a variable optical axis angle mechanism using a variable apex angle prism, for example, a mechanism described in the following document 1 is known. The optical axis angle variable mechanism described in Document 1 forms a vertical angle variable prism by sealing a liquid between a pair of rotatable glass substrates, and forms an angle between the pair of glass substrates (the angle of the vertical angle variable prism). By changing the vertex angle)
The transmitted light axis angle is changed. Reference 1: JP-A-61-269572

Further, as another example of the optical axis angle variable mechanism using the apex angle variable prism, for example, the following documents 2, 3,
The mechanism described in No. 4 is known. References 2, 3,
The variable optical axis angle mechanism described in No. 4 forms a vertex angle variable prism by arranging a plano-convex lens and a plano-concave lens whose spherical curvatures are approximated such that the spherical surfaces face each other. By rotating about the center of curvature as the center of rotation, the angle between the planes of the two lenses (vertical angle of the variable vertical angle prism) is changed, thereby changing the transmitted optical axis angle.

Document 2: JP-A-57-25803 Document 3: JP-A-06-070220 Document 4: JP-A-06-281889

As an optical axis angle variable mechanism using an afocal optical system, for example, an optical axis angle variable mechanism described in the following documents 5 and 6 is known. The optical axis angle varying mechanisms described in Documents 5 and 6 constitute an afocal optical system with one concave lens and one convex lens, and make each lens perpendicular to the optical axis and in a direction orthogonal to the optical axis. By moving, the transmitted optical axis angle is changed. Document 5: JP-A-6-118471 Document 6: JP-A-7-168235

[0011]

[0005] However, Document 1
The variable optical axis angle mechanism described in (1) has a problem that high-speed response is poor and power consumption is large due to the viscosity of the liquid. In addition, this optical axis angle variable mechanism also has a problem in that, when the liquid leaks or the pressure becomes low, bubbles are generated in the liquid and the image quality is deteriorated. For this reason, it was difficult to use this optical axis angle variable mechanism for a video camera for broadcasting business using a large-diameter lens.

In the optical axis angle varying mechanism described in Documents 2, 3, and 4, the center of rotation of the two lenses exists in the optical path. Therefore, in this optical axis angle variable mechanism, a small supporting mechanism is required as a supporting mechanism for rotatably supporting the two lenses. However, in the variable optical axis angle mechanism, a small and effective support mechanism has not yet been developed as the support mechanism. The variable optical axis angle mechanism also has a problem that large power is required in order to realize a high-speed response against the inertia of a large-diameter lens. For this reason, it was difficult to use this optical axis angle variable mechanism also in a video camera for broadcasting.

Further, in the optical axis angle varying mechanisms described in Documents 5 and 6, conventionally, a supporting mechanism for supporting a lens so as to be movable in a direction perpendicular to the optical axis is provided in the optical axis direction. Suspensions made of flat springs or the like have been used. However, in such a configuration, when a large-diameter lens is supported, a long suspension is required, and the support mechanism and the imaging optical system of the video camera interfere with each other, and it is difficult to assemble the imaging optical system. There was a problem and that the drive control of the suspension was difficult. This problem also occurs when a support mechanism using an orthogonal slide guide is used as the lens support mechanism. For this reason, it was difficult to use this optical axis angle variable mechanism for a video camera for broadcasting business.

The present invention has been made in view of the above problems, and has as its object to be applied to a camera shake correction apparatus using an optical axis angle variable mechanism using an afocal optical system as an optical axis angle variable mechanism. Even in this case, an optical axis angle variable device and a shake that can solve the problem of interference with the imaging optical system, the problem of difficulty in assembling to the imaging optical system, and the problem of difficulty in controlling the drive system. It is an object to provide a correction device.

[0015]

SUMMARY OF THE INVENTION The present invention is directed to a first and second variable optical axis angle lenses in which at least one of the optical axis angles can be changed by moving in a direction perpendicular to the optical axis.
An optical system including the first lens, first support means rotatably supporting the first lens in a plane perpendicular to the optical axis, and an optical system including the second lens in a plane perpendicular to the optical axis. And a second support means rotatably supported in a direction different from the direction of rotation of the first lens, and in order to correct the transmitted light axis angle,
Of the first and second lenses, the one that is the optical axis angle variable lens is rotationally driven to rotate the optical axis angle correcting rotation driving means, and the optical axis angle correcting rotation driving means is used to rotate the lens. Rotational driving means for rotationally driving the other lens to rotationally drive the other lens in order to counteract the deviation of the lens from the optical axis angle variable direction caused by rotationally driving the lens which is the optical axis angle variable lens. And characterized in that:

According to the present invention, when a request for correcting the transmitted optical axis angle is generated, the lens which is the optical axis angle variable lens among the first and second lenses is rotationally driven by the optical axis angle correcting rotating means. You. Thereby, the transmitted light axis angle is set to the target value. However, in this case, the lens which is an optical axis angle variable lens performs circular motion instead of linear motion. For this reason, this lens is deviated from the target direction, that is, the optical axis angle variable direction. In order to cancel the shift, the other lens is rotated by the shift canceling rotation drive unit. This cancels out the deviation of the lens that is the variable optical axis angle from the variable optical axis angle direction.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of a shake correction apparatus according to the present invention. FIG. 1 shows a typical case where the shake correction apparatus of the present invention is applied to a camera shake correction apparatus of a video camera. FIG. 1 shows the overall configuration of a video camera provided with the shake correction apparatus according to the present embodiment.

The video camera shown in FIG. 1 has a camera body 100 for photographing a subject image, and a camera shake correction device 200 for suppressing a shake of a photographed image due to a camera shake of the video camera. The camera shake correction device 200 is configured to be detachable from the camera body 100. That is, the camera shake correction device 200 is configured as an adapter that can be used as needed.

The camera body 100 includes a camera section 110 for converting a subject image into an electric image pickup signal,
And a video signal processing circuit 120 that converts the imaging signal output from the video signal 10 into a video signal. The camera unit 110 has an imaging optical system 111 for capturing an object image, and an imaging element 112 for converting the object image captured by the imaging optical system 111 into an electrical imaging signal. Here, the imaging optical system 111 can change the focal length. In addition, the imaging element 112 is configured by, for example, a charge-coupled device.

The image pickup configuration of the camera section 110 may be a single-chip image pickup configuration, or a two-plate, three-plate, or four-plate image pickup configuration using a dichroic prism or a dichroic mirror. Is also good.

The camera shake correction device 200 detects the magnitude of the camera shake (change in direction) of the video camera (relative angular displacement of the photographing optical axis), and corrects the transmitted light axis angle based on the detected output. Thereby, the shake of the captured image due to the camera shake of the video camera is suppressed. In this case, the angular displacement of the camera shake is detected using, for example, two axes perpendicular to the optical axis and orthogonal to each other. As this axis, for example, pitching P direction (tilt direction)
And an axis in the yawing Y direction (pan direction).

Hereinafter, the configuration of the camera shake correction apparatus 200 will be described in detail. In the following description, pitching P
The description will be made with P added to the components related to the direction, and Y added to the components related to the yawing Y direction.

The image stabilizing apparatus 200 shown in FIG. 1 includes a shake correcting mechanism 210 provided with a variable optical axis angle mechanism and a target value of a rotation angle of lenses 211 (P) and 211 (Y) described later. A calculating unit 220 for calculating, and a pitching P described later
A driving circuit 230 (P) for rotating the driving motor 213 (P) in the directional direction, and a driving circuit 230 (Y) for rotating the driving motor 213 (Y) in the yawing Y direction described later. The arithmetic unit 220 is, for example, a central processing unit (C
PU). Note that this operation unit 220
The function will be described later in detail.

The shake correcting mechanism 210 rotates the plano-concave lens 211 (P) and the plano-convex lens 211 (Y) and the plano-concave lens 211 (P) constituting the afocal optical system in a plane perpendicular to the optical axis. Rotating shaft 212 (P) movably supported
And a rotation shaft 212 (Y) that rotatably supports the plano-convex lens 211 (Y) in a plane perpendicular to the optical axis. These constitute a variable optical axis angle mechanism. The configuration of the optical axis angle variable mechanism will be described later in detail.

The shake correction mechanism 210 includes a drive motor 213 that rotationally drives the plano-concave lens 211 (Y).
(P), a drive motor 213 (Y) for driving the plano-convex lens 211 (Y) to rotate, a drive motor 213 (Y) for driving the plano-convex lens 211 (Y) to rotate, and a plano-concave lens 211
Rotation angle detector 214 (P) for detecting the rotation angle of (P)
And a rotation angle detector 214 (Y) for detecting the rotation angle of the plano-convex lens 211 (Y).

The shake correction mechanism 210 is a shake detector 215 (P) for detecting an angular displacement (angular velocity) per unit time in the pitching P direction of the camera shake.
And a shake detector 215 (Y) for detecting an angular displacement (angular velocity) per unit time in the yawing Y direction. These are constituted by, for example, angular velocity sensors such as vibrating gyros.

Further, the shake correcting mechanism 210 includes a lens barrel housing 21 for housing the lenses 211 (P), 211 (Y) and the like.
6. The lens barrel housing 216 is disposed such that the central axis coincides with the optical axis of the imaging optical system 111. Inside the lens barrel housing 216, lenses 211 (P), 21
1 (Y), rotating shafts 212 (P), 212 (Y), drive motors 213 (P), 213 (Y), and rotating angle detectors 214 (P), 214 (Y). And externally,
The shake detectors 215 (P) and 215 (Y) are attached.

The above is the configuration of the entire video camera.
Here, the configuration of the optical axis angle conversion mechanism and the function of the calculation unit 220 will be described.

First, the configuration of the optical axis angle varying mechanism will be described with reference to FIG. Here, FIG. 2 is a perspective view showing the configuration of the optical axis angle variable mechanism.

As shown in FIG. 2, the plano-concave lens 211
(P) and the plano-convex lens 211 (Y) are configured to have substantially the same diameter and substantially the same focal length. Then, both lenses 211 (P) and 211 (Y)
They are arranged facing each other with a small space therebetween via the virtual plane A1. Thereby, both lenses 211 (P), 211
(Y) constitutes an afocal optical system as a whole.

In this case, both lenses 211 (P), 211
(Y), as shown in FIG. 1, are arranged to face each other such that the planes face each other. Also, both lenses 211
(P) and 211 (Y) are arranged such that the coaxial optical axis B (see FIG. 2) coincides with the optical axis of the imaging optical system 111. Thereby, both lenses 211 (P) and 211 (Y)
Are arranged such that the coaxial optical axis B coincides with the center of the image area. Here, the coaxial optical axis B refers to an optical axis when the optical axes of both lenses 211 (P) and 211 (Y) are made to coincide.

The plano-concave lens 211 (P) is rotated via a bearing 1a (P) provided at the outer edge thereof.
It is rotatably supported on the shaft. This rotating shaft 212 (P)
Is disposed parallel to the optical axis of the flat lens 211 (P). Thus, the plano-concave lens 211 (P) is pivotally supported so as to be rotatable in a plane perpendicular to the optical axis.

The plano-convex lens 211 (Y) is rotated by a pivot shaft 212 (Y) via a bearing 1a (Y) provided on the outer edge thereof.
It is rotatably supported on the shaft. This rotating shaft 212 (Y)
Is disposed parallel to the optical axis of the plano-convex lens 211 (P). Thus, the plano-convex lens 211 (P) is pivotally supported so as to be rotatable in a plane perpendicular to the optical axis.

In this case, the rotating shafts 212 (P), 212
(Y) is positioned such that a plane A2 including the rotation axis 212 (P) and the coaxial optical axis B and a plane A3 including the rotation axis 212 (Y) and the coaxial optical axis B are substantially orthogonal to each other. ing. Thus, the lenses 211 (P) and 211 (Y) rotate in directions substantially orthogonal to each other.

The rotating shaft 212 (P) is connected to the coaxial optical axis B.
Are positioned on a horizontal line (a straight line in the yawing Y direction) C (Y) that passes through. Thereby, the plano-concave lens 211
(P) rotates along the pitching P direction. Similarly, the rotation shaft 212 (Y) is positioned on a vertical line (a straight line in the pitching P direction) C (P) passing through the coaxial optical axis B. Thus, the plano-concave lens 211 (Y) rotates along the yawing Y direction.

The above is the configuration of the optical axis angle variable mechanism. The above-described drive motor 213 (P) and the rotation angle detector 2 are attached to the rotation shaft 212 (P) of the plano-concave lens 211 (P).
14 (P) is directly connected from the side opposite to the virtual plane A1 side. Similarly, the rotation axis 2 of the plano-convex lens 211 (Y)
The drive motor 213 (Y) and the rotation angle detector 214 (Y) are directly connected to 12 (Y) from the side opposite to the virtual plane A1 side.

Next, the function of the arithmetic unit 220 will be described. The calculation unit 220 is provided with a corresponding shake detector 215
(P) and 215 (Y), the lens 2
It has a function of calculating the camera shake correction rotation angles of 11 (P) and 211 (Y). Here, the camera shake correction rotation angle refers to a lens 211 required to suppress image shake due to camera shake.
(P) and 211 (Y).

The calculating unit 220 also determines whether the other lens 211 (Y) or 211 (Y) is based on the camera shake correction rotation angle of one lens 211 (P) or 211 (Y).
It has a function of calculating the deviation canceling rotation angle of (P). Here, the deviation canceling rotation angle refers to the lens 211 (P), 2
A rotation angle for canceling the displacement of the lenses 211 (P) and 211 (Y) from the variable direction of the optical axis angle caused by rotating the lens 11 (Y) by the camera shake correction rotation angle. The optical axis angle variable direction is defined as the plano-concave lens 211.
In the case of (P), the pitching is in the P direction, and the plano-convex lens 2
In the case of 11 (Y), the direction is the yawing Y direction.

The operation unit 220 includes a lens 211
It has a function of calculating the required rotation angles of (P) and 211 (Y). Here, the required rotation angle refers to the lens 211 (P),
211 (Y) refers to a rotation angle that must actually rotate from the current rotation angle (hereinafter, referred to as “posture rotation angle”). The required rotation angle is obtained by subtracting the posture rotation angle from the sum of the camera shake correction rotation angle and the shift cancellation rotation angle. The above is the function of the arithmetic unit 220.

The operation of the above configuration will be described.

First, the imaging operation of the video camera will be described. In FIG. 1, the subject image is a lens 211 (P),
211 (Y) and the imaging device 1 via the imaging optical system 111
12 tied on. The subject image formed on the image sensor 112 is converted into an electrical image signal by the image sensor 112. This imaging signal is supplied to the video signal processing circuit 120
And converted into a video signal. This video signal is
For example, it is supplied to a recording / reproducing unit (not shown) and recorded on a magnetic tape. The above is the imaging operation of the video camera.

Next, a description will be given of a camera shake correction operation of the camera shake correction apparatus 200. Here, before describing the overall operation of the camera shake correction apparatus 200, in order to make the overall operation easier to understand, the operation of the optical axis angle variable mechanism, the problem of the mechanism and the solution therefor are described. Will be described.

First, the operation of the optical axis angle varying mechanism will be described.
3 to 5 are diagrams showing the rotation of the lenses 211 (P) and 211 (Y). 3 to 5 show the lens 2
11 (P) and 211 (Y) are front views as seen from the front of a video camera, for example. Here, FIG. 3 shows the rotation locus of the plano-concave lens 211 (P), FIG. 4 shows the rotation locus of the plano-convex lens 211 (Y), and FIG.
(P) and a state where the rotation trajectories of 211 (Y) are superimposed.

As shown in FIG. 3, the plano-concave lens 211
(1) rotates around a horizontal line C (Y) passing through the rotation shaft 212 (P). The figure shows a plano-concave lens 211 (1).
Shows a state in which it is turned by an angle θ about the horizontal line C1 to the positive side (for example, the upper side in the figure) or the negative side (for example, the lower side in the figure).

Here, the angular displacement of the video camera in the pitching P direction due to camera shake is usually about ± 0.3 degrees. Therefore, the pivot angle of the plano-concave lens 221 (P) required to correct the camera shake can be small. Thereby, the rotation locus of the plano-concave lens 221 (P) substantially follows the pitching P direction. As a result, the transmitted light axis angle is displaced substantially along the pitching P direction.

Further, as shown in FIG.
1 (Y) is a vertical line C (P) passing through the rotation shaft 212 (Y).
Around the center. In the figure, a plano-concave lens 211 is shown.
(1) is a positive side (for example, upper side in the figure) or a negative side (for example, lower side in the figure) around the vertical line C (P).
Shows a state in which it has been rotated by the angle θ.

Here, the angular displacement of the video camera in the yawing Y direction due to camera shake is usually about ± 0.3 degrees. Therefore, the rotation angle of the plano-convex lens 221 (Y) required to correct the camera shake can be small. Accordingly, the rotation locus of the plano-convex lens 221 (Y) is substantially along the yawing Y direction. As a result, the transmitted light axis angle is displaced substantially along the yawing Y direction.

From the above, as shown in FIG. 5, when the rotational locus of the plano-concave lens 211 (P) and the rotational locus of the plano-convex lens 211 (Y) are superimposed, the apex angle variable prism capable of two-dimensional angular displacement. Similarly, the transmitted light axis angle can be displaced in all directions defined by two orthogonal axes.

FIG. 6 is a diagram showing an example of a state in which the transmitted light axis angle is displaced to the positive side in the pitching P direction.

Now, the lenses 211 (P) and 211 (Y)
Is located at a position where the optical axes coincide. In this state, when light such as subject light parallel to the optical axis enters the plano-concave lens 211 (P), the plano-concave lens 211 (P)
A virtual image is formed at the focal point F of (P). As a result, divergent light is emitted from the plano-concave lens 211 (P) using the focal point F as an imaginary light source. This divergent light is reflected by the plano-concave lens 2
11 (P) is incident on a plano-convex lens 211 (Y) having the same focal length. Thereby, this plano-convex lens 211 (Y)
From this, parallel light is emitted using the virtual light source as the light source at the focal point F.

In this state, as shown in FIG. 6, when the plano-concave lens 211 (P) is displaced by the distance y to the negative side in the pitching P direction, the transmitted optical axis angle is displaced by α to the positive side in the pitching P direction. Can be Thereby, the plano-convex lens 211
From (Y), as shown in FIG. 6, parallel light displaced from the optical axis of the incident light by an angle α is emitted.

In this case, the angle α is
Assuming that the focal length of (P), 211 (Y) is f, it is expressed by the following equation (1). α = tan ^-1 (y / f) (1)

Although a detailed description is omitted, when the plano-concave lens 211 (P) is displaced to the positive side in the pitching P direction, the transmitted optical axis angle can be displaced to the negative side in the pitching P direction. . When the plano-convex lens 211 (Y) is displaced to the positive side or the negative side in the yawing Y direction, the transmitted optical axis angle can be displaced to the negative side or the positive side in the yawing Y direction.

As described above, the lenses 211 (P), 211
By rotating (Y), the transmitted light axis angle can be corrected in all directions defined by two orthogonal axes. Thereby, the shake of the captured image due to the hand shake can be suppressed. The above is the operation of the optical axis angle variable mechanism.

Next, the problem of the optical axis angle varying mechanism and its solution will be described. Lens 211 (P), 211
By rotating (Y) along the optical axis angle variable direction, it is possible to surely suppress the shake of the captured image due to the camera shake.

However, in this case, the lens 211
(P) and 211 (Y) are also slightly shifted in a direction orthogonal to the optical axis angle variable direction. Thus, the captured image shakes in a direction orthogonal to the direction of the shake of the captured image due to camera shake.
Therefore, in order to correct the transmitted light axis angle, the lens 21
When 1 (P) and 211 (Y) are rotated, it is necessary to cancel the displacement of the lenses 211 (P) and 211 (Y) (hereinafter, referred to as “orthogonal direction error”) caused by the rotation.

Therefore, in this embodiment, one of the lenses 211 (P) or 2 (P) is used to correct the transmitted light axis angle.
When 11 (Y) is rotated, according to the amount of rotation,
By rotating the other lens 211 (Y) or 211 (P), the orthogonal direction error is canceled.

Hereinafter, this will be described in detail with reference to FIGS. FIG. 7 shows a state in which the plano-concave lens 211 (P) is rotated by θ to the positive side in the pitching P direction. In this case, the center point D of the plano-concave lens 211 (P)
As shown in FIG. 8, (P) moves to the positive side in the pitching P direction by y and also moves to the negative side in the yawing Y direction by Δx.

In this case, y and Δx are the values of the plano-concave lens 211.
Assuming that the radius of (P) is r, the following equations (2) and
It is represented by (3). y = r · sin θ (2) Δx = y · tan θ = r · sin θ · tan θ (3)

Here, Δx corresponds to the orthogonal direction error. Due to the occurrence of the orthogonal direction error Δx, the captured image swings to the positive side in the yawing Y direction.

In order to deal with this problem, in the present embodiment, as shown in FIG. 9, the center point D (Y) of the plano-convex lens 211 (P) is rotated by an angle に toward the negative side in the yawing Y direction. This cancels the vertical error Δx. In this case, the angle ψ is expressed by the following equation (5) from the following equation (4). sinψ = x / r = sin θ · tan θ (4) ψ = sin ⁻¹ (sin θ · tan θ) (5)

By rotating the plano-convex lens 211 (P) to the negative side in the yawing Y direction by an angle ψ, the plano-convex lens 211 (P) can be moved not only in the negative side in the yawing Y direction but also in the pitching P direction. It also shifts to the negative side by Δy.
As a result, the captured image swings to the positive side in the pitching P direction.

However, this orthogonal direction error Δy is extremely small. For example, the orthogonal direction error Δx is 100 of y.
The orthogonal direction error Δy is about one hundredth thereof. Therefore, the shake of the photographed image due to the error Δy has almost no visual problem.
Therefore, in the present embodiment, the cancellation of the orthogonal direction error Δy is not performed.

Although the detailed description is omitted, the above-mentioned problem is caused by the fact that the plano-concave lens 211 (P) is pitched P
Not only does it rotate to the positive side of the direction, but also to the negative side. In this case, the plano-convex lens 211
(Y) may be turned to the positive side in the yawing Y direction.
Such a problem also occurs when the plano-convex lens 211 (Y) is rotated in the yawing Y direction. In this case, the plano-concave lens 211 (P) may be rotated in the pitching P direction. The above is the problem of the optical axis angle variable mechanism and its solution.

Next, the overall operation of the camera shake correction apparatus 200 will be described. When there is no camera shake, the lens 211
(P) and 211 (Y) are positioned so that the optical axis coincides with the center of the image area. In this state, when a camera shake occurs, the angular displacement of the shake is determined by the shake detector 2.
15 (P) and 215 (Y). In this case, the angular displacement Ps of the shake in the pitching P direction is detected by the shake detector 215 (P), and the angular displacement Ys in the yawing Y direction is detected by the shake detector 215 (Y). As a result, the shake in all directions of the video camera is detected as components in two orthogonal axes.

This detection output is supplied to the arithmetic section 220. The calculation unit 220 further includes a rotation angle detector 21.
4 (P) and 214 (Y) detection outputs are supplied. The calculation unit 2220 calculates the required rotation angles of the lenses 211 (P) and 211 (Y) based on the plurality of detection outputs. Data indicating each required rotation angle is stored in the drive circuit 2 respectively.
30 (P) and 230 (Y). This allows
The drive motors 213 (P) and 213 (Y) are driven to rotate. As a result, the lenses 211 (P) and 211 (Y) are rotationally driven by the required rotational angle. Thereby, the transmitted light axis angle is corrected to the target value. As a result, the shake of the captured image due to the hand shake is suppressed, and the shake of the captured image due to the orthogonal direction error is suppressed. The above is the image stabilization device 2
00 is the overall operation.

Next, referring to FIG.
The operation of 0 will be described in detail. Note that FIG.
20 is a flowchart showing a process 20. The drive control system of the camera shake correction device 200 (the operation unit 220, the drive circuit 230
(P), 230 (Y), drive motor 213 (P), 21
3 (Y)) is activated by turning on a main switch (not shown), and is terminated by cutting off.
The process in FIG. 10 is started when a power switch (not shown) of the camera shake correction apparatus 200 is turned on, and ends when the power switch is turned off.

In this processing, the arithmetic section 220 first takes in the detection outputs of the shake detectors 215 (P) and 215 (Y) (step S101). Thus, the angular displacement Ps of the shake of the video camera in the pitching P direction and the angular displacement Ys of the shake in the yawing Y direction are captured.

Next, the calculating section 220 calculates the plano-concave lens 221 based on the angular displacement Ps of the shake in the pitching P direction.
The camera shake correction rotation angle θp of (P) is calculated (Step S)
102). At the same time, the calculation unit 220 calculates the plano-convex lens 2 based on the angular displacement Ys of the shake in the yawing Y direction.
The camera shake correction rotation angle ψy of 21 (Y) is calculated (step S102).

Next, the arithmetic section 220 includes a plano-concave lens 221.
Based on the camera shake correction rotation angle θp of (P), a shift canceling rotation angle Δψy of the plano-convex lens 221 (Y) for canceling the orthogonal direction error Δx of the lens 221 (P) is calculated (step S103). ). This deviation canceling rotation angle Δψy
Is represented by the following equation (6). Δψy = sin ⁻¹ (sin θ · tan θ) (6)

At the same time, based on the hand-shake correction rotation angle ψy of the plano-convex lens 221 (Y), the arithmetic section 220 also calculates a plano-concave lens 221 (P) for canceling the orthogonal direction error Δy of the plano-convex lens 211 (Y). Deviation canceling rotation angle Δ
θp is calculated (step S103). The deviation canceling rotation angle Δθp is expressed by the following equation (7). Δθp = sin ^-1 (sinψ · tanψ) (7)

Next, the arithmetic section 220 includes a plano-concave lens 221.
(P) is added to the plano-concave lens 2
The total rotation angle θp + Δθp of 21 (P) is calculated (step S104). At the same time, the calculation unit 220 adds the rotation angles ψp, Δψp of the plano-convex lens 221 (Y), and
The total rotation angle ψp + Δψp of the plano-convex lens 221 (Y) is calculated (step S104).

Next, the arithmetic section 220 is provided with a shake detector 215
The detection signals of (P) and 215 (Y) are fetched (step S105). Thereby, the lenses 211 (P), 211
The attitude rotation angles θ0, ψ0 of (Y) are captured.

Next, the arithmetic section 220 includes a plano-concave lens 221.
From the total rotation angle θp + Δθp of (P), the plano-concave lens 221 is obtained.
By subtracting the attitude rotation angle θ0 of (P), the plano-concave lens 221 is obtained.
The required rotation angle (θp + Δθp) −θ0 of (P) is calculated,
The result of this calculation is applied to the driving circuit 230 in the pitching P direction.
(P) (step S106). This allows
The plano-concave lens 221 (P) is driven to rotate, and the rotation angle is set to a target value (camera shake correction rotation angle θp).

At the same time, the arithmetic unit 220 subtracts the attitude rotation angle θ0 of the plano-convex lens 221 (Y) from the total rotation angle ψy + Δψy of the plano-convex lens 221 (Y) to obtain the required rotation of the plano-convex lens 221 (Y). The angle (ψy + Δψy) −ψ0 is calculated, and this calculation result is used as the driving circuit 23 in the yawing Y direction.
0 (Y) (step S106). As a result, the plano-convex lens 221 (Y) is driven to rotate, and the rotation angle is set to a target value (camera shake correction rotation angle ψy).

As described above, the transmitted light axis angle is corrected to the target value. As a result, the shake of the captured image due to camera shake is suppressed, and the shake of the captured image due to the orthogonal errors Δx, Δy of the lenses 211 (P), 211 (Y) is suppressed.

When the processing in step S106 is completed, 1
The correction operation for the batch ends. Thereafter, the operation unit 220
Executes the processing again from step S101. Hereinafter, similarly, each time one correction operation is completed, the above-described operation is repeated. Then, this operation ends when the power switch is set to the cutoff state as described above.

According to the present embodiment described in detail above, the lens 211 (P), 211 (Y) is used as a support mechanism for supporting the lens 211 (P) so as to be movable in the optical axis angle variable direction.
Since the support mechanism for rotatably supporting (P) and 211 (Y) in the plane perpendicular to the optical axis is used, the size of the support mechanism can be reduced. This can prevent interference between the variable optical axis angle mechanism and the imaging optical system 111, and can facilitate assembly of the variable optical axis angle mechanism to the imaging optical system 111.

According to such a configuration, the lens 2
The lenses 211 (P) and 211 (Y) can be moved in the optical axis angle variable direction only by rotating the 11 (P) and 211 (Y).
Drive control for moving (Y) in the optical axis angle variable direction can be simplified.

Further, according to such a configuration, the load of the lenses 211 (P) and 211 (Y) is
(P) and 212 (Y), so that the lenses 211 (P) and 211 (Y) can be smoothly swung. Thereby, high-speed response and power saving can be achieved.

According to the present embodiment, the orthogonal error generated by rotating one of the lenses 211 (P) or 212 (Y) by the camera shake correction rotation angle is calculated as follows.
Since the canceling is performed by the rotation of the other lens 211 (Y) or 211 (P), it is possible to suppress the shake of the captured image due to the error in the orthogonal direction.

As described above, one embodiment of the present invention has been described in detail, but the present embodiment is not limited to the above-described embodiment.

For example, in the above embodiment, the case where the entire camera shake correction device 200 is configured as an adapter has been described. However, in the present invention, a part thereof may be configured as an adapter. For example, the operation unit 220
The drive circuits 230 (Y) and 230 (P) may be incorporated in the camera body 100, and only the camera shake correction mechanism 210 may be configured as an adapter.

In the above embodiment, the case where the camera shake correction device 200 is configured as an adapter has been described. However, in the present invention, this may be built in the video camera. In this case, in the present invention, the lens 2
Since the support mechanisms 11 (P) and 211 (Y) are small, it is easy to incorporate them.

In the above embodiment, the case where the present invention is applied to a camera shake correction apparatus having an afocal optical system including one concave lens and one convex lens as the optical system has been described. However, the present invention can also be applied to a camera shake correction apparatus having an afocal optical system including a plurality of concave lenses and a plurality of convex lenses.

In the above embodiment, the case where the present invention is applied to an image stabilizing apparatus that moves a concave lens and a convex lens in a direction orthogonal to each other has been described. However, the present invention can be applied to a general image stabilization apparatus that moves both in different directions.

In the above embodiment, the case where the present invention is applied to a camera shake correction device having two lenses as an optical axis angle variable lens has been described. However, the present invention is also applicable to a camera shake correction apparatus having one lens as the optical axis angle variable lens. That is, the present invention can be applied to a camera shake correction device that corrects only a shake in one axis direction.

In the above embodiment, the case where the present invention is applied to a camera shake correction apparatus having an afocal optical system as an optical system has been described. However, the present invention can be generally applied to a camera shake correction apparatus having an optical system capable of changing a transmitted optical axis angle by moving a lens in a direction perpendicular to the optical axis.

In the above embodiment, the case where the present invention is applied to a camera shake correction device for a video camera has been described. However, the present invention can also be applied to a camera shake correction device of an optical system other than the video camera.
For example, the present invention can be applied to a camera shake correction device of an electronic still camera.

In the above embodiment, the case where the present invention is applied to a camera shake correction device has been described. However, the present invention can also be applied to a shake correction device that suppresses image shake due to shake other than camera shake. Therefore, the present invention can also be applied to a shake correction apparatus for an optical system that is fixedly used on a tripod, such as a movie camera or a movie projector. This is because, even in such an optical system, image vibration may occur due to externally applied vibration.

In the above description, a case has been described in which the present invention is applied to a shake correction apparatus that corrects a transmitted light axis angle in order to correct shake. However, the present invention can be applied to an apparatus in which the transmitted optical axis angle is positively changed.

In addition, it goes without saying that the present invention can be variously modified and implemented without departing from the scope of the invention.

[0094]

As described above in detail, according to the optical axis angle variable device and the shake correcting device of the present invention, the support mechanism for supporting the optical axis angle variable lens so as to be movable in the optical axis angle variable direction includes: Since the shaft support mechanism for rotatably supporting the optical axis angle variable lens on the optical axis is used, the size of the support mechanism can be reduced.

As a result, it is possible to prevent interference between the variable optical axis angle mechanism and the imaging optical system, and to easily assemble the variable optical axis angle mechanism into the imaging optical system.

According to such a configuration, the variable optical axis angle lens can be moved in the variable optical axis angle direction only by rotating the variable optical axis angle lens. The drive control can be simplified.

Further, according to such a configuration, the load of the optical axis angle variable lens can be received by the rotating shaft.
This allows the lens to swing smoothly. Thereby, high-speed response and power saving can be achieved.

Further, according to the variable optical axis angle apparatus and the shake correcting apparatus of the present invention, the displacement of the variable optical axis angle lens from the variable optical axis angle direction caused by the rotation of the variable optical axis angle lens can be reduced by the other lens The rotation of the optical axis cancels out, so that the image shake due to the optical axis angle variable lens being displaced from the optical axis angle variable direction can be suppressed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a configuration of an optical axis angle variable mechanism according to an embodiment.

FIG. 3 is a diagram illustrating a rotation locus of a plano-concave lens according to an embodiment.

FIG. 4 is a diagram illustrating a rotation locus of a plano-convex lens according to an embodiment.

FIG. 5 is a diagram illustrating the synthesis of the rotation trajectories of the plano-concave lens and the plano-convex lens according to the embodiment;

FIG. 6 is a diagram for explaining the operation of the optical axis angle varying mechanism according to the embodiment;

FIG. 7 is a diagram for explaining the operation of the optical axis angle varying mechanism according to the embodiment;

FIG. 8 is a diagram for explaining the operation of the optical axis angle varying mechanism according to the embodiment;

FIG. 9 is a diagram for explaining the operation of the optical axis angle varying mechanism according to the embodiment;

FIG. 10 is a flowchart for explaining the operation of the calculation unit according to one embodiment.

[Explanation of symbols]

100: camera body, 110: imaging units 110, 111 ...
Image pickup optical system, 112 image pickup device, 120 image signal processing circuit, 200 image stabilization device, 210 image stabilization mechanism, 220 operation unit, 230 (P), 230 (Y) drive circuit, 211 (P) ... plano-concave lens, 211 (Y) ... plano-convex lens, 212 (P), 212 (Y) ... rotating shaft, 21
3 (P), 213 (Y) ... drive motor, 214 (P),
214 (Y): rotation angle detector, 215 (P), 215
(Y) ... shake detector

Claims (6)

[Claims] An optical system including first and second lenses which are optical axis angle variable lenses capable of changing a transmitted optical axis angle by moving at least one of them in a direction perpendicular to the optical axis; First shaft support means for rotatably supporting the first lens in a plane perpendicular to the optical axis; and the first lens in the plane perpendicular to the optical axis for the second lens. A second support means rotatably supported in a direction different from the direction of rotation of the first and second lenses; and an optical axis angle of the first and second lenses for correcting the transmitted optical axis angle. Optical axis angle correcting rotation driving means for driving a lens which is a variable lens, and rotating the lens which is the optical axis angle variable lens by the optical axis angle correcting rotation driving means. In order to cancel the deviation of this lens from the optical axis angle variable direction, the other lens is rotationally driven. Optical axis angle variation apparatus characterized by comprising a erasure for rotation driving means. 2. The optical system according to claim 1, wherein each of the first and second lenses is the optical axis angle variable lens, and the optical axis angle correcting rotation driving unit is configured to correct the transmitted optical axis angle. First optical axis angle correcting rotation driving means for driving the first lens to rotate, and second optical axis angle for driving the second lens to correct the transmitted optical axis angle. A correcting rotation driving unit, wherein the rotation canceling rotation driving unit is generated when the first lens is rotationally driven by the first optical axis angle correcting rotation driving unit. In order to cancel the shift of the lens from the variable direction of the optical axis angle, a first shift canceling rotation driving means for rotating and driving the second lens, and the second lens is configured to be the second light. A method for changing the optical axis angle of this lens which is generated by being rotationally driven by the rotational drive means for correcting the axial angle 2. The optical axis angle varying device according to claim 1, further comprising: a second deviation canceling rotation driving unit that rotationally drives the first lens to cancel the deviation from the direction. 3. The optical system according to claim 1, wherein the first lens is a concave lens, the second lens is a convex lens, and the optical system is an afocal optical system obtained by combining the concave lens and the convex lens. 2. The optical axis angle varying device according to claim 1, wherein: 4. The optical axis angle varying device according to claim 1, wherein the first direction and the second direction are orthogonal to each other. 5. An optical axis angle variable lens capable of changing a transmitted optical axis angle by moving at least one of the optical axis angles in a direction perpendicular to the optical axis. An optical system including first and second lenses, and first shaft support means for rotatably supporting the first lens in a plane perpendicular to the optical axis; and the second lens. Second shaft support means rotatably supporting in a direction perpendicular to the optical axis and in a direction different from the direction of rotation of the first lens; shake detection for detecting shake of the optical system; Means, a lens which is the optical axis angle variable lens among the first and second lenses based on a detection output of the shake detection means, in order to suppress an image shake due to a shake of the optical system. An optical axis angle correcting rotation driving unit that is rotationally driven; The other lens is rotationally driven in order to cancel the deviation of the lens, which is the variable optical axis angle lens, from the variable optical axis angle direction caused by the rotation of the lens which is the optical axis angle variable lens by the angle correction rotational driving means. A shake correction device comprising: a rotation driving means for canceling a shift. 6. The shake correction apparatus according to claim 5, wherein at least a part is configured as an adapter detachable from the optical system.