JPH10133248A - Camera shake correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for effectively performing the camera shake correction of a television camera. SOLUTION: This camera shake correcting device 1 is constituted of a camera shake correcting optical system and a driving device driving the camera shake correcting optical system in two axial directions perpendicular to an optical axis and orthogonally crossing each other. This camera shake correcting device is attached between the main image pickup optical part 2 and the camera main body 3 of the television camera through an attaching mechanism in common with the conventional one for attaching the part 2 and the main body 3. Consequently, when the device 1 is not used, the optical part 2 can be used by being directly attached to the main body 3. The camera shake correcting device is optically constituted so as to convert the focal distance of the main image pickup optical system to be in the range of >=1 and <=1.5 times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to camera shake correction for an image pickup apparatus, and more particularly to a camera shake correction apparatus for optically performing camera shake correction.

[0002]

2. Description of the Related Art Conventionally, in an image pickup apparatus such as a television camera, image shaking due to camera shake has been a problem. In particular, in an image pickup apparatus having an image pickup optical system having a zoom function, there is a large influence of camera shake on a photographed image on the tele side.

Here, a conventional camera shake correcting mechanism will be described with reference to FIGS.
FIGS. 12A and 12B are views for explaining a conventional electronic camera shake correction mechanism. FIG. 12A shows a clipping frame of an image on a CCD, and FIG. 12B corresponds to a clipping frame of an image. The calculation of the correction angle of the optical axis will be described. FIG. 13 is a view for explaining a conventional optical camera shake correction mechanism. FIG.
AP (Variable Angular Prisu
m) is a diagram showing the configuration of the element, and FIG. 15 is a diagram showing this operation.

A camera shake correction mechanism shown in FIG.
A method of cutting out the image frame of the imaging region in D14 (hereinafter, referred to as D14
Simply referred to as “electronic type”) and the prism 35 shown in FIG.
(Hereinafter, simply referred to as “optical type”), in which the shake is detected by a camera shake sensor and correction is performed according to the value.

First, the electronic system will be described.
As shown in FIG. 1A, the CCD 14 used in an electronic system has an imaging area having a large area A0 having more horizontal scanning lines than the television image standard. An actual image is obtained by cutting an area A1 having a horizontal scanning line conforming to the standard from an area A0 as a video signal. At this time, the area A1 is, for example, an area A2 or an area A3 according to a camera shake detection signal. As shown in the figure, the image is cut out by moving within the area A0 so that no shake occurs as a result on the CCD 14, and the shake of the image due to camera shake is corrected.

FIG. 1 shows the electronic camera shake correction capability.
This will be described with reference to FIG. Here, considering the vertical direction, the focal length of the imaging lens 15 is f, the area A
The side 1 is 2h0 and the side of the area A0 is 2 (h + h0), and the correctable angle θ at this time is: tan (θ ₀ + θ) = (h + h0) / f (1) tan θ ₀ = h0 / F (2) θ ₀ + θ is small, so that θ ₀ + θ = (h + h ₀ ) / f (3) θ ₀ = h ₀ / f (4), so that θ = h / f (5) The angle can be determined.

If the CCD 14 is 2/3 inch, for example, the area A0 is 8.8 mm × 6.6 mm, and if the margin area for correction is approximately 30% in terms of the side ratio, it is 2.64 mm × 1. .98 mm. Therefore, the correction area on one side from the center is half of each, 1.32 mm
× 0.99 mm. At this time, when the focal length of the imaging lens 15 is f = 8 mm on the short focal length side, when focusing on the vertical direction, the correction angle θ is 0.99０．９8 ÷ 0.124 ra.
d ≒ 7 degrees and a large correctable angle can be obtained, but 0.99 ° when f = 200 mm on the long focal length side.
When it was 200 と 0.005 rad ≒ 0.28 degrees, there was a disadvantage that the correctable angle was extremely small. Of course, the same can be said for the horizontal direction.

Further, the CCD 14 must secure a large imaging area for correction, and the chip size becomes large and the CCD 14 becomes expensive. On the other hand, if a CCD conforming to the image standard is used, all pixels cannot be used, so that deterioration in image quality is inevitable.

Next, the optical system will be described. The principle of operation is as shown in FIG.
Is provided in front of the imaging lens 15 to change the apex angle of the prism 35 in accordance with a camera shake detection signal, and adjust the optical axis of incident light on the emission side.

That is, when the light L1 is perpendicularly incident on one surface of the prism 35 having the apex angle α, the emission angle of the light L2 emitted from the other surface is displaced by an angle θ with respect to the incident optical axis. That is, assuming that the refractive index of the prism 35 is n, nsinα = sin (α + θ) (6) Since α + θ is small, nα = α + θ (7), and therefore θ = (n−1) α (8). Here, for example, when n = 1.5 and α is displaced by ± 2 degrees, the deflection angle δ can be changed by ± 1 degrees.

Next, a conventional VAP device having a variable apex angle will be described with reference to FIG. 14. Referring to FIG. 14, the two glass plates 30a, 30a are opposed to each other at an arbitrary distance on the optical axis L.
b is arranged, and the outer peripheries of the two glass sheets 30a and 30b are connected by a bellows sealing member 32 having a bellows shape which can be extended and contracted to form a sealed space inside. An optical element, that is, a prism is formed by filling the sealed space with a transparent liquid, and the apex angle of the prism is turned around a shaft 34 provided on at least one of the two glass sheets 30a and 30b. It changes by moving. In addition, the sheet glass 30a, 30b and the bellows sealing member 32 are covered with a cover 3 to secure the sealing property.
1a and 31b.

FIG. 15 shows the operation of the above-described VAP element. FIG. 15A shows a state in which the sheet glasses 30a and 30b are in a parallel state, and the incident light travels straight along the incident optical axis L. Emit. FIG. 2B shows a case where one of the glass sheets, for example, the glass sheet 30a is rotated around the shaft 34 and tilted, and has an angle α between the glass sheet 30a and the glass sheet 30b (ie, the apex angle α). At this time, as described above, the light L1 vertically incident on the glass sheet 30b becomes a light L2 inclined by .theta. = (N-1) .alpha. With respect to the incident optical axis when emitted from the glass sheet 30a. Will be done.

However, in the above-described VAP element, the bellows sealing member 32 is deformed by the mass of the liquid 33, making it difficult to keep the sheet glass in the initial position, and moving the liquid to change it into a wedge shape. Therefore, a large driving force is required, the response is inferior, and the volume changes due to the temperature change of the environment, the viscous resistance changes,
Therefore, there has been a problem that the control characteristics change.

[0014]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a camera shake correcting optical device having high image quality, high speed response and high stability, which eliminates the above-mentioned disadvantages of the camera shake preventing element and mechanism. It is something to offer.

[0015]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned problems, and an image stabilizing optical system including a plurality of lenses and an image stabilizing optical system are provided.
A camera shake correction device including a drive device that is driven in two axial directions perpendicular to the optical axis and orthogonal to each other, wherein the camera shake correction device includes a main imaging optical unit of a television camera and a television. Attach it to the camera body via a detachable attachment mechanism.

Further, the above-mentioned object can be solved by providing the optical system for converting the focal length of the main image pickup optical system in a range of 1 to 1.5 times the camera shake correction optical system.

The camera shake correction apparatus using the above-described camera shake correction optical system can be configured to be small and lightweight, and the camera shake correction apparatus is very easy to use since it is freely detachable. In addition, power consumption and aberration fluctuation are small, and control responsiveness is good.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a configuration of camera shake correction according to the present invention. FIG. 2 is a diagram illustrating a first camera shake correction optical system according to the present invention, FIG. 3 is a diagram illustrating a second camera shake correction optical system, and FIG. 4 is a diagram illustrating a third camera shake correction optical system. FIG. FIG. 5 is a block diagram of a control system for controlling the position of the camera shake correction optical system according to the present invention. 6 to 11 are aberration diagrams of these camera shake correction optical systems.

First, as shown in FIG. 1, a camera shake correction apparatus 1 according to the present invention is mounted between a main imaging optical unit 2 of a television camera and a camera body 3. The mounting means has the same configuration as that of a normal main imaging optical unit 2 using a flange and bayonet used when mounting the main imaging optical unit 2 to the camera body 3. Is detachable. Therefore, when the camera shake correction device 1 is not used, the main imaging optical unit 2 can be directly mounted on the camera body 3.

Next, the configuration of the camera shake correction optical system used in the camera shake correction apparatus 1 of the present invention will be described with reference to FIGS. 2 to 4 and Tables 1 and 3. In the table, r represents the radius of curvature, and d represents the thickness of the lens on the optical axis or the distance between the lenses. When r is negative, it indicates a concave surface with respect to the light incident direction, while when r is positive, it indicates a convex surface. Further, nd is the refractive index at the spectrum d line, Abbe number Vd is the number represented by Vd = (nd-1) / (nF-nC) (9), and nF and nC are the spectrum F, respectively. Line and C line. In addition, CCD12
Shall use a 2/3 inch type with a diagonal of 11 mm. Further, P ₁ and P ₂ schematically show prisms for performing color separation (r = 0 represents a plane).

[0021] First of camera shake compensating optical system Figure 2 and Table 1 represents the optical configuration of the first camera shake correction optical system 100. The camera shake correction optical system 100 is configured so as to have the least aberration variation when the main imaging lens having the F-number of 2 is placed at a position where the focal length is not changed.

[0022]

[Table 1]

FIG. 6 is a diagram showing aberrations when a lens having a focal length of 100 mm and an F-number of 2 having almost no aberration is attached in front of the camera shake correction optical system 100. FIG. A position 75% from the diagonal position, and FIG. 4B shows the lateral aberration DY in the Y direction at the center position. Also, FIG.
Is a position 75% from the diagonal position, and FIG. 4D is a lateral aberration DX in the X direction at the center position. FIG. 3E shows the astigmatism AS of the sagittal surface S and the tangential surface T. In the drawing, number 1 is a value for the d line, number 2 is a value for the F line, and number 3 is a value for the C line. The same applies to the following. FIG. 7 shows the camera shake correction optical system 1 under the same conditions as FIG.
FIG. 10 is an aberration diagram when 00 is moved by 1 mm in a direction perpendicular to the optical axis. (A) to (e) in FIG. 7 are (a) to (e) in FIG.
It relates to the same aberration as (e).

FIGS. 6 and 7 show that the camera shake correction optical system 1
When 00 is moved by 1 mm in the direction perpendicular to the optical axis, a slight increase in aberration is observed, but it is practically sufficient, and it can be seen that this example is suitable for use in a camera shake correction optical device.

[0025] represents the optical configuration of a second camera shake correction optical system Figures 3 and a second camera shake correction optical system 110 in Table 2. The camera shake correction optical system 110 is configured so that aberration is minimized when the focal length of the main imaging lens having an F number of 2.8 is set to be 1.4 times.

[0026]

[Table 2]

FIG. 8 shows that the focal length with little aberration is 100 mm and the F-number is 2.
8A and 8B are diagrams showing aberrations when the lens No. 8 is attached, wherein FIG. 7A shows a position 75% from the diagonal position, and FIG. 8B shows a lateral aberration DY in the Y direction at the center position. FIG. 3C shows the lateral aberration DX in the X direction at the position 75% from the diagonal position, and FIG. Further, FIG.
Is the astigmatism AS of the sagittal surface S and the tangential surface T
It is. FIG. 9 is an aberration diagram when the camera shake correction optical system 110 is moved by 1 mm in a direction perpendicular to the optical axis under the same conditions as in FIG. (A) to (e) in FIG. 9 relate to the same aberrations as (a) to (e) in FIG.

8 and 9 show that the camera shake correction optical system 1
When the lens 10 is moved by 1 mm in the direction perpendicular to the optical axis, a slight increase in aberration is recognized, but it is sufficient for practical use, and it can be seen that this example is suitable for use in a camera shake correction optical device.

[0029] Third of the camera shake correction optical system 4 and Table 3 represents the optical configuration of a third blur correction optical system 120. The camera shake correction optical system 120 is configured such that aberration is minimized when the main imaging lens is placed at a position where the F-number is 2.8 and the focal length is 1.2 times.

[0030]

[Table 3]

FIG. 10 shows a state before the camera shake correction optical system 120.
FIG. 9A is a diagram showing aberration when a lens having a focal length of 100 mm and an F-number of 2.8 having almost no aberration is attached, and FIG. 11A shows a position 75% from a diagonal position, and FIG. Is the lateral aberration DY in the Y direction at the center position. FIG. 3C shows the lateral aberration DX in the X direction at the position 75% from the diagonal position, and FIG. Further, FIG. 3E shows a sagittal surface S and a tangential surface T.
Is the astigmatism AS. FIG. 11 is an aberration diagram when the camera shake correction optical system 120 is moved by 1 mm in a direction perpendicular to the optical axis under the same conditions as in FIG. (A) to (e) in FIG. 11 relate to the same aberrations as (a) to (e) in FIG.

From FIGS. 10 and 11, when the camera shake correction optical system 120 is moved by 1 mm in the direction perpendicular to the optical axis, a slight increase in aberration is recognized, but it is practically sufficient.
It can be seen that this example is suitable for use in a camera shake correction optical device.

Next, the configuration and operation of the camera shake correction apparatus 1 will be described. FIG. 5 is a block diagram showing an example of a driving mode of the camera shake correction apparatus 1.
0 is held by the driving device 9 so as to be movable in the X-axis direction and the Y-axis direction in a plane perpendicular to the optical axis. The detection outputs of the X-axis camera shake sensor 4 and the Y-axis camera shake sensor 5 including an acceleration sensor and the like for detecting the camera shake of the imaging apparatus are input to a control circuit 6 including a CPU and the like. The movement control amount is calculated, and the result is input to the X-axis and Y-axis driving mechanism units of the driving device 9 via the X-axis driving circuit 7 and the Y-axis driving circuit 8. As a result, the XY position of the camera shake correction optical system 100 is controlled, and the optical axis of the light incident on the imaging optical system is adjusted. As a result, the image blur on the CCD 12 does not occur. Obviously, the camera shake correction optical systems 110 and 120 may be used instead of the camera shake correction optical system 100.

Although the X-axis and Y-axis drive mechanisms are schematically shown as voice coil types, it goes without saying that other drive configurations for performing the same operation may be employed. Further, the camera shake detection is not limited to the angular velocity sensor and the acceleration sensor, but may be a method of obtaining camera shake information by comparing an image with the immediately preceding frame image, for example.

[0035]

As described above, by using the optical system and the driving mechanism of the present invention, it is possible to construct a small, light, low power consumption, small fluctuation of aberration, and high responsive camera shake correcting optical device. . In addition, since the camera shake correction optical system has a detachable configuration, when the camera shake correction is not required, the device can be detached from the television camera to take a picture, which is excellent in usability.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of camera shake correction according to the present invention.

FIG. 2 is a diagram showing a first camera shake correction optical system according to the present invention.

FIG. 3 is a diagram showing a second camera shake correction optical system according to the present invention.

FIG. 4 is a diagram showing a third camera shake correction optical system according to the present invention.

FIG. 5 is a block diagram of a control system for controlling the position of the camera shake correction optical system according to the present invention.

FIG. 6 is a diagram illustrating aberration when a lens having a focal length of 100 mm and an F-number of 2 having little aberration is attached in front of the first camera shake correction optical system. (A) is a position 75% from the diagonal position, and (b) is a lateral aberration DY in the Y direction at the center position. (C) is a position 75% from the diagonal position,
(D) is the lateral aberration DX in the X direction at the center position. (E) shows the sagittal direction S and the tangential direction T.
Is the astigmatism AS.

7 is an aberration diagram when the first camera shake correction optical system is moved by 1 mm in a direction perpendicular to the optical axis under the same conditions as in FIG.

FIG. 8 is a diagram illustrating aberrations when a lens having a substantially aberration-free focal length of 100 mm and an F-number of 2.8 is attached in front of the second camera shake correction optical system. (A) is a position 75% from the diagonal position, and (b) is a lateral aberration DY in the Y direction at the center position. (C) is a position 75% from the diagonal position, and (d) is a lateral aberration DX in the X direction at the center position.
(E) shows the astigmatism AS in the sagittal direction S and the tangential direction T.

9 is an aberration diagram when the second camera shake correction optical system is moved by 1 mm in a direction perpendicular to the optical axis under the same conditions as in FIG.

FIG. 10 is a diagram showing aberrations when a lens having a focal length of 100 mm and an F-number of 2.8 having almost no aberration is attached in front of a third camera shake correction optical system. (A) is a position 75% from the diagonal position, and (b) is a lateral aberration DY in the Y direction at the center position. (C) is a position 75% from the diagonal position, and (d) is a lateral aberration DX in the X direction at the center position.
(E) shows the astigmatism AS in the sagittal direction S and the tangential direction T.

11 is an aberration diagram when the third camera shake correction optical system is moved by 1 mm in a direction perpendicular to the optical axis under the same conditions as in FIG.

12A and 12B are views for explaining a conventional electronic camera shake correction mechanism, wherein FIG. 12A shows a cutout frame of an image on a CCD, and FIG. 12B shows an optical axis corresponding to the cutout frame of the image. 2 shows the calculation of the correction angle.

FIG. 13 is a view for explaining a conventional optical camera shake correction mechanism.

FIG. 14 is a diagram showing a configuration of a VAP element.

FIG. 15 is a diagram showing the operation of the VAP element.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Camera shake correction device, 2 ... Main imaging optical part, 3 ... Camera body, 4 ... X-axis camera shake sensor, 5 ... Y-axis camera shake sensor, 6
... Control circuit, 7 ... X-axis drive circuit, 8 ... Y-axis drive circuit, 9
... Drive device, 10 ... X axis actuator, 11 ... Y axis actuator, 12,14 ... CCD, 15 ... Imaging lens, 30a, 30b ... Sheet glass, 31a, 31b ... Cover, 32 ... Bellows sealing member, 33 ... Liquid, 34 … Axis, 35
… Prism, P ₁ , P ₂ … Prism, G ₁ to G ₂₉ … Lens

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor, Tsugio Sato 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Norihiko Noguchi 6-35, 7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony (72) Inventor Nobumoto Hyakuchi 6-35-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Koichi Yoshikawa 6-35-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Stock In company

Claims (2)

[Claims] A camera shake correction optical system comprising a plurality of lenses; and a driving device for driving the camera shake correction optical system in two axial directions perpendicular to the optical axis and orthogonal to each other. Wherein the camera shake correction device is mounted between the main imaging optical unit of the TV camera and the TV camera body via a detachable mounting mechanism. Camera shake correction device. 2. The optical system according to claim 1, wherein the camera shake correction optical system has an optical configuration that converts the focal length of the main image pickup optical system within a range of 1 to 1.5 times. Image stabilization device.