JPH09288289A - Camera shake correcting device and camera shake correcting device with lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the reliability of a driving means, to make power consumption low, and to make a movable part small in size and light in weight by providing an optical element for correcting an optical axis supported so as to be moved in a direction orthogonal to the optical axis of a main lens system. SOLUTION: This camera shake correcting device 24 is constituted by disposing a lens 25 for correcting an optical axis, a vertical direction driving device 26, a horizontal direction driving device, a vertical direction position sensor 28 and a horizontal direction position sensor in an optical path at the front of an image pickup lens system. The lens 25 is an a focal lens constituted of two lenses, that is, a concave lens 25a and a convex lens 25b, and is fixed and held in a fixed frame attached to the lens barrel through a fixing screw. The lens 25b is attached to a movable frame 31 as a movable lens. The driving device 26 drives the lens 25b in a vertical direction. Then, it is constituted of a yoke 26a, a fixed coil 26b and a magnet 26c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera shake correction device for correcting camera shake in an optical system device and a camera shake correction device with a lens barrel in which a lens barrel of an optical system device is mounted on the camera shake correction device. .

[0002]

2. Description of the Related Art As a conventional device for correcting camera shake in an optical system device such as a handy type video camera or a telescope, an afocal lens consisting of a convex lens and a concave lens in front of an image pickup lens system is used for optical axis correction. 2. Description of the Related Art There is known an optical device that is disposed as a lens for use in a lens and moves one or both of the convex lens and the concave lens in a direction orthogonal to the optical axis to correct camera shake. In such a camera shake correction device, it is necessary to detect the position of the optical axis correction lens, and as a detection method, the position of the optical axis correction lens is orthogonal to each other in two directions, for example, in the HV direction (H. The direction is divided into the horizontal direction and the V direction is the vertical direction), and the position sensor detects the position of the optical axis correcting lens in each direction.

6 to 8 are schematic configuration diagrams showing an example of a peripheral portion and the like including a conventional camera shake correction device, which is mounted on, for example, a video camera. This video camera 1
An image pickup device (CCD) 3 is arranged behind the image pickup lens system 2, and a camera shake correction device 4 is arranged in front of the image pickup lens system 2. The camera shake correction device 4 includes an optical axis correction lens 5, a vertical direction drive device 6 and a horizontal direction drive device 7,
It is arranged in the optical path in front of the imaging lens system 2. The optical axis correcting lens 5 is actually an afocal lens including a convex lens and a concave lens, but only the convex lens 5a on the imaging lens system 2 side is shown in FIGS. 6 to 8. The convex lens 5a is arranged in front of the image pickup lens system 2 in close proximity via suspensions 5b and 5b, and is supported so that its optical axis is always parallel to the main optical axis of the image pickup lens system 2. .

The vertical driving device 6 includes a driving means for driving the convex lens 5a in the vertical direction, for example, a linear motor 6a and a position sensor 8 for detecting the vertical position of the convex lens 5a. It is arranged to be opposed to each other in the vertical direction. The linear motor 6a includes a yoke 6b to which a magnet 6c is adhered and which is attached to the fixed frame side (not shown), and a moving coil 6d which is attached to the movable frame side which is a lens holder for holding the convex lens 5a. The horizontal driving device 7 includes driving means for driving the convex lens 5a in the horizontal direction, for example, a linear motor 7a and a position sensor 9 for detecting the horizontal position of the convex lens 5a. Is arranged at a position opposed to. Linear motor 7a is magnet 7c
And a yoke 7b attached to the fixed frame side,
It is composed of a moving coil 7d attached to the movable frame side which is a lens holder for holding the convex lens 5a.

The position sensors 8 and 9 are composed of, for example, light emitting diodes (LED) 8a and 9a and semiconductor position detecting elements (PSD) 8b and 9b, respectively. LED8
Reference characters a and 9a are attached to the peripheral portions of the convex lens 5a at positions facing the linear motors 6a and 7a with the optical axis interposed therebetween. Further, the PSDs 8b and 9b each have a light-receiving surface formed in a long shape, and a fixed frame is used to
It is arranged so as to face the EDs 8a and 8b in the optical axis direction and extend in the longitudinal direction in the radial direction of the convex lens 5a. As a result, the vertical component of the amount of movement of the convex lens 5a is determined by the position sensor 8 arranged at a position facing the vertical driving device 6 with the optical axis in between, and the horizontal component of the amount of movement of the convex lens 5a is determined by It is detected by a position sensor 9 arranged at a position facing the horizontal driving device 7 with the optical axis interposed therebetween. Therefore, the position sensors 8 and 9 can obtain the position data of the optical axis correcting lens 5.

The image pickup lens system 2 is provided with a vertical-direction camera shake detection sensor 10 and a horizontal-direction camera shake detection sensor 11, each of which is composed of an angular velocity sensor. When camera shake is detected by the camera shake detection sensor 10 for the vertical direction and the camera shake detection sensor 11 for the horizontal direction, a camera shake detection signal that is angular velocity data is output. A shake detection signal from each of the shake detection sensors 10 and 11 is used as a shake amount calculation circuit 12 for the vertical direction and a shake amount calculation circuit 13 for the horizontal direction.
Is input to, and the change amount (angle data) of the angle in the vertical direction and the horizontal direction is integrated and output. The vertical and horizontal angle data from the camera shake amount calculation circuits 12 and 13 are supplied to a vertical optical axis correction lens position control circuit 14 and a horizontal optical axis correction lens position control circuit 15, respectively. It is input and compared with the position data of the optical axis correcting lens 5 obtained by the position sensors 8 and 9, and the angle amount (correction data) to be corrected is detected. Then, the correction data is output to each of the driving devices 6 and 7, and the optical axis correcting lens 5
Is moved in the vertical and horizontal directions by a predetermined distance to correct the optical axis.

[0007]

In the conventional image stabilizing device 4 described above, the winding terminals of the moving coils 6d and 7d of the driving devices 6 and 7 are generally planted near the coils 6d and 7d of the movable frame. It is attached to a terminal pin (not shown) provided and soldered and connected. The flexible printed circuit board or wiring material connected to the terminal pins is routed along the peripheral surface of the movable frame and is further guided to the fixed frame side, for example, along the suspension 5b.

Therefore, when the lens holder 5b is driven, an external force is applied to the flexible printed circuit board or the wiring material, so that the flexible printed circuit board or the wiring material is easily broken, and the reliability of each drive device 6, 7 is increased. There was a problem of low sex. Further, when the lens holder 5b is driven, a so-called reaction force is generated in the flexible printed circuit board or the wiring material, so that each drive device 6,
There is also a problem that it is necessary to increase the torque of No. 7 and the current consumption required for driving increases. Further, since the lens holder 5b, which is the movable part, is provided with the relatively heavy and large moving coils 6d and 7d, there is a problem that it is difficult to reduce the size and weight of the entire movable part.

In view of the above points, the present invention has a simple structure with high reliability of driving means, low power consumption, a small movable portion and a light weight, and an image stabilizer with a lens barrel. Is intended to provide.

[0010]

According to the present invention, there is provided an optical axis correction, which is movably supported in front of a main lens system in a direction orthogonal to an optical axis of the main lens system. In a camera shake correction device having an optical element for optical axis correction and driving the optical element for optical axis correction to correct camera shake, a magnetic body fixed to the movable frame side of the optical element for optical axis correction and fixed to the fixed frame side And a driving means for driving the optical element for optical axis correction.

According to the above construction, the optical element for correcting the optical axis is driven by controlling the drive current to the winding fixed to the fixed frame. Therefore, since the line for supplying the drive current is not connected to the movable portion of the optical axis correcting optical element, the optical axis correcting optical element itself can be configured to be small and lightweight, and a relatively small drive can be achieved. It can be easily driven by electric current.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The embodiments described below are preferred specific examples of the present invention,
Although various technically preferred limitations are given, the scope of the present invention is not limited to these forms unless otherwise specified in the following description.

FIG. 1 and FIG. 2 are schematic configuration diagrams of a peripheral portion including an embodiment of an image stabilization apparatus according to the present invention, and FIGS. 3 to 5 are schematic configuration diagrams of an embodiment of the image stabilization apparatus. , Mounted on a video camera, for example. In this video camera 20, an image pickup device (CCD) 23 is arranged behind an image pickup lens system 22 mounted in a lens barrel 21 having a substantially hollow cylindrical shape, and the image pickup lens system 22 is provided.
A camera shake correction device 24 is disposed in front of. The imaging lens system 22 includes a first lens group 22a having three elements, a second lens group 22b having three elements, and a third lens group 22 having one element.
c and a fourth lens group 10 including a fourth lens group 22d having a three-lens configuration.
The second lens group 22b and the fourth lens group 22b
By moving the lens group 22d in the optical axis direction, it is configured as a zoom lens capable of changing the focal length and focusing. The image pickup device (CCD) 23 takes in the image of the subject formed by the image pickup lens system 22 and outputs it as an image signal.

The camera shake correction device 24 includes an optical axis correction lens 25, a vertical drive device 26, a horizontal drive device 27,
Vertical position sensor 28 and horizontal position sensor 29
However, it is arranged in the optical path in front of the imaging lens system 22. The optical axis correcting lens 25 is a concave lens 2
It is configured as a two-focal afocal lens composed of 5a and a convex lens 25b. The concave lens 25a is fixed and held as a fixed lens with respect to a fixed frame 30 attached to the lens barrel 21 with a fixing screw. The convex lens 25b is attached to the movable frame 31 as a movable lens.

The vertical driving device 26 includes a convex lens 25b.
Is a driving means for vertically driving the yoke, for example, a linear motor, and is a yoke 26 attached to the fixed frame 30.
a and a fixed coil 26b attached to the yoke 26a
And a magnet 26c attached to the movable frame 31 so as to face the yoke 26a and the fixed coil 26b in the optical axis direction. The horizontal driving device 27 is a driving unit for driving the convex lens 25b in the horizontal direction, for example, a linear motor, and includes a yoke 27a attached to the fixed frame 30, a fixed coil 27b attached to the yoke 27a, and the yoke. The magnet 27c is attached to the movable frame 31 so as to face the fixed coil 27b and the fixed coil 27b in the optical axis direction.

The position sensors 28 and 29 are composed of, for example, light emitting diodes (LED) 28a and 29a and semiconductor position detecting elements (PSD) 28b and 29b, respectively. The LEDs 28a and 28b are mounted on the peripheral edge of the movable frame 31 so as to be adjacent to the vertical drive device 26 and the horizontal drive device 27 so as to emit light forward in the optical axis direction. In addition, PSD28
The light receiving surfaces of b and 29b are formed to be long, and the fixed frame 30 faces the LEDs 28a and 28b in the optical axis direction and has a convex lens 2 in the longitudinal direction.
It is arranged so as to extend in the radial direction of 5a. With the above configuration, the vertical component of the movement amount of the convex lens 25b is detected by the position sensor 28, and the horizontal component of the movement amount of the convex lens 25b is detected by the position sensor 29. Therefore, the position sensors 28, 29
Thus, position data of the optical axis correcting lens 25b is obtained.

Further, a control section 35 is provided in the fixed frame 30, and the fixed frame 30 or the lens barrel 21 is provided.
Includes an acceleration sensor and a CCD 2 for detecting camera shake.
A camera shake detection sensor (not shown) by an image motion vector detection system or the like using an output signal from the image pickup device 3 is provided. The vertical shake amount and the horizontal shake amount from the shake detection sensor are input to the control unit 35 and compared with the position data from the position sensors 28 and 29 to calculate the angle amount (correction data) to be corrected. It Then, based on this correction data, the vertical driving device 2
6 and the fixed coils 26b and 2 of the horizontal driving device 27
The drive current to 7b is controlled to correct the optical axis due to camera shake. Here, the movable frame 31
Is attached to the other end of a spring 32 whose one end is fixed to the fixed frame 30. Through this spring 32, a certain range is set in a plane in two directions orthogonal to the optical axis, that is, a vertical direction and a horizontal direction. Is held with the degree of freedom. Furthermore, the movable frame 31
Balancers 33 and 34 are attached to the magnets 26c and 27c, respectively, on the sides facing each other with respect to the optical axis.

An example of the operation of each part when a subject is photographed by the video camera 20 having the above-described structure will be described. The optical axis correcting lens 25 and the imaging lens system 22 are C
An image of the subject is formed on the CD 23. The CCD 23 captures this image and outputs it as an image signal. At this time,
The position sensors 28 and 29 of the camera shake correction device 24 always detect the vertical and horizontal positions of the convex lens 25b, which is a movable lens, as position data and input it to the control unit 35.

When camera shake occurs in the video camera 20, the camera shake correction device 24 or the camera shake detection sensor provided in the lens barrel 21 detects the amount of camera shake and inputs it to the controller 35. The control unit 35 compares the amount of camera shake with the position data from the position sensors 28 and 29 to calculate correction data, and drives and controls the vertical direction drive device 26 and the horizontal direction drive device 27 based on the correction data. Thus, the movable frame 31 and the convex lens 25b are moved by an appropriate distance in the vertical direction and the horizontal direction. As a result, the optical axis of the light incident on the imaging lens system 22 is changed to the optical axis correcting lens 2
Since the correction is made by the movement of the convex lens 25b of No. 5, the light enters the CCD 23 correctly. In this case, the fixed coils 26b, 27 for driving the respective drive devices 26, 27
Since b is fixedly held in the fixed frame 30, respectively,
It is not necessary to connect the wiring material for supplying the drive current to the fixed coils 26b and 27b to the movable frame 31. Therefore, the movable frame 31 which is the movable portion and the convex lens 25b which is the movable lens can be moved by a relatively small driving force without being affected by the reaction force of the wiring member for driving.

In the above-described embodiment, of the two optical axis correcting lenses 25 forming the afocal lens, only the convex lens 25b is moved by the drive devices 26 and 27. However, the concave lens 25a and the convex lens 25b may be integrally moved,
Further, an optical axis correction lens composed of three or more lenses may be used, and at least one of the lenses may be moved by a driving device. Further, in the above-described embodiment, the lens 25 is adopted for the optical axis correction, but the invention is not limited to this, and for example, a transparent liquid is sealed between two glass plates to reverse the detected camera shake. A so-called VAP type movable prism in which the angle of the glass is changed depending on the direction may be adopted.

[0021]

As described above, according to the present invention,
The optical axis correcting optical element itself can be configured to be small and lightweight, and can be easily driven with a relatively small driving current, so that the torque of the driving means can be small.
Current consumption can be reduced. Further, the wiring material for supplying the drive current to the winding of the drive means is not broken, and the drive means can be highly reliable.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a peripheral portion including an embodiment of an image stabilizing apparatus according to the present invention.

FIG. 2 is a schematic side sectional view of a peripheral portion including the embodiment of the image stabilizing apparatus shown in FIG.

FIG. 3 is a schematic plan view of an embodiment of the image stabilizing apparatus shown in FIG.

FIG. 4 is a schematic perspective view of a movable portion of the image stabilizing apparatus shown in FIG.

5 is a schematic perspective view of a fixed portion of the image stabilizing apparatus shown in FIG.

FIG. 6 is a schematic side view showing an example of a peripheral portion including a conventional camera shake correction device.

7 is an exploded perspective view of an example of the image stabilization apparatus shown in FIG.

8 is a schematic plan view of an example of the image stabilizing apparatus shown in FIG.

[Explanation of symbols]

20 ... video camera, 21 ... lens barrel, 22
... Imaging lens system (main lens system), 23 ... Imaging device (CCD), 24 ... Image stabilizer, 25 ...
Optical axis correction lens, 25a ... concave lens (fixed lens), 25b ... convex lens (movable lens), 26 ...
・ Vertical drive, 27 ... Horizontal drive, 2
6a, 27a ... Yoke, 26b, 27b ... Fixed coil, 26c, 27c ... Magnet, 28 ...
Vertical position sensor, 29 ... Horizontal position sensor,
30 ... Fixed frame, 31 ... Movable frame, 32 ... Spring, 33, 34 ... Balancer, 35 ... Control unit

Claims (2)

[Claims] 1. An optical axis correcting optical element, which is supported in front of the main lens system so as to be movable in a direction orthogonal to an optical axis of the main lens system, and the optical axis correcting optical element is provided. A camera shake correction device for driving and correcting a camera shake, comprising: a magnetic body fixed to a movable frame side of the optical element for optical axis correction and a winding fixed to a fixed frame side; A camera shake correction device comprising drive means for driving an optical element. 2. A lens barrel for accommodating a main lens system, and an optical axis correcting optical movably supported in front of the main lens system in a direction orthogonal to an optical axis of the main lens system. In a camera shake correction device with a lens barrel having an element, and a camera shake correction device for driving the optical axis correction optical element to correct the camera shake, the optical axis correction optical element being fixed to a movable frame side. A camera shake correction device with a lens barrel, comprising: a magnetic body; and a winding fixed to a fixed frame side, and a drive unit for driving the optical element for optical axis correction.