JPH0783449B2 - Imaging device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographing device such as a video camera.

2. Description of the Related Art With the widespread use of video tape recorders in recent years, there are many opportunities to shoot with a video camera, and there is a demand for a video camera that can perform stable camera work with less image blur even without using a tripod. There is.

Hereinafter, an example of the above-described conventional imaging device will be described with reference to the drawings. Conventionally, an image pickup apparatus of this type is shown in FIG. 5, as shown in Japanese Patent Laid-Open No. 53-64175, for example.
It had the structure shown in the front view and side view of FIG. That is, there is a rotor case 1 having a rotor that rotates at a high speed as a directional gyro, which is supported by a horizontal gimbal 3 on left and right horizontal shafts 2, and the horizontal gimbal 3 includes vertical gimbals 5 on left and right gimbal shafts 4. Supported by. Similarly, in the vertical gyro, the center rotor case 6 is supported by the horizontal gimbal 7 and the vertical gimbal 8, and the video camera 9 and the like are installed on the rotor case 6. Therefore, by rotating the direction gyro and the vertical gyro at high speed, the video camera 9 is stable even when shooting is performed with the video camera holding member swaying,
It is possible to obtain a captured image with little blur.

Problems to be Solved by the Invention However, in the above-mentioned configuration, there is a problem that the image blur in the rolling direction cannot be suppressed even if the image blur in the pitching direction and the panning direction can be suppressed. Further, in the above-mentioned configuration, since the gyro that rotates at a high speed is used, the device becomes large in size and also increases in weight, so that the entire device must be installed and used, and the problem of lack of maneuverability is encountered. , If you do hand-held shooting and you do not need to prevent image blur, you can stop the image blur prevention means such as a gyro, but the gyro effect will disappear and the video camera will be unstable. Therefore, there is a problem that it is difficult to determine the shooting direction.

Means for Solving the Problems In order to solve the above problems, a photographing apparatus of the present invention is a photographing lens for photographing a subject, a lens barrel for holding the photographing lens, and an optical image from the photographing lens as an electric signal. A photoelectric conversion means for converting the photoelectric conversion means, a holding means for holding the photoelectric conversion means, a first rotation supporting means for rotatably supporting the holding means so as to be rotatable around the optical axis about the optical axis, and a holding means. Holding means for urging the horizontal axis of the absolute coordinates and the horizontal axis of the photographing coordinates of the photoelectric conversion means to coincide with each other, and the lens barrel to hold the optical axis of the photographing lens and the optical axis of the photoelectric conversion means to coincide with each other. Means for supporting the means, second rotation support means for rotatably supporting the support means in the panning direction (or the pitching direction), and driving the support means in the panning direction (or the pitching direction) First driving hand Dan,
First locking means for locking the rotation of the support means, second locking means for locking the rotation of the holding means, and driving the first locking means and the second locking means. It is characterized in that it is composed of a second drive means.

Effect The present invention can suppress image blurring in the pitching direction, the panning direction, and the rolling direction by the above-described configuration. In addition, since a large and heavy gyro as in the past is not used, it is easy to make it small and lightweight, and the photographer can use it while holding it. In addition, since the shooting coordinates of the camera body and the optical axis of the shooting lens coincide with each other when locked, it is possible to shoot without a sense of discomfort even after locking. Furthermore, when carrying the lens barrel, the lens barrel does not come into contact with the exterior or the like, and the wiring from the rotating member is not twisted, so that the lens barrel can be carried with ease.

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

1a is a configuration diagram of the entire image capturing apparatus, FIG. 1b is a view locked in the configuration diagram of the entire image capturing apparatus, and FIG. 2 is a sectional view taken along line XX of FIG. In FIGS. 1 and 2, a taking lens 11 for taking an image of a subject is held by a lens barrel 12.
An image pickup device 13 such as a CCD is provided on the focal plane of the taking lens 11, and the image pickup device 13 is attached to a rotating member 14. Further, the electric signal converted from the optical image by the image sensor 13 is converted into a predetermined video signal by the video circuit 15. A ball bearing 16 is press-fitted into the rotating member 14. The flange 17 is held integrally with the lens barrel 12, the rotary shaft 18 is rotatably fitted to the ball bearing 16 from the flange 17, and the rotary member 14 rotates with respect to the flange 17. It is free. Here, a male screw is formed on a part of the rotary shaft 18, and a female screw is cut on the flange 17 so as to engage with the male screw.
When tightened, the rotating shaft 18 moves the rotating member 14 through the ball bearing 16.
Will be pressed in the Y direction. Further, a ball bearing 19 is press-fitted into the lens barrel 12, and a ring-shaped protrusion 14a provided on the rotating member 14 is rotatably fitted to the ball bearing 19, and the rotating member 14 Is also rotatable with respect to the lens barrel 12. Here, since the ball bearings 16 and 19 are applied with pressure in the Y direction by the rotating shaft 18, the play can be eliminated. Further, the rotating shaft 18 is hollow, and is connected to the video circuit 15 by passing the input / output line of the image pickup device 13 through the hole 18a of the rotating shaft 18. Here, the center of gravity of the rotating member 14 is eccentric so that the horizontal axis of the imaging coordinates of the image sensor 13 always coincides with the horizontal axis of the absolute coordinates. That is, the rotating member 14 is biased in one direction by gravity so that the horizontal axis of the image pickup coordinates of the image pickup device 13 always coincides with the horizontal axis of the absolute coordinates.

A ball bearing 2 is provided on each of the upper portion 12a and the lower portion 12b of the lens barrel 12.
0 and 21 are press-fitted, and the rotation shafts 23 and 24 are rotatably fitted to the ball bearings 20 and 21 from the upper and lower sides of the first frame 22, respectively. It is rotatable with respect to 22. A ring-shaped magnet 26, which is magnetized as required, is fixed to the lower portion 12b of the lens barrel 12 via a back plate 25 made of a magnetic material. A stator winding 28 adhered to a stator flat plate 27 made of a magnetic material is fixed to the first frame 22 so as to face the magnet 26. Further, in order to detect the rotational position of the lens barrel 12, a Hall element 27a is provided on the stator flat plate 27 so as to face the magnet 26.

Ball bearings 29 and 30 are press-fitted into the left and right sides of the first frame 22, respectively, and rotation shafts 32 and 33 are rotatably fitted into the ball bearings 29 and 30 from the left and right sides of the second frame 31, respectively. The lens barrel 12 and the first frame 22 are rotatable with respect to the second frame 31. A ring-shaped magnet 35, which is magnetized as required, is fixed to the right side of the first frame 22 via a back plate 34 made of a magnetic material. A stator winding 37 adhered to a stator flat plate 36 made of a magnetic material is fixed to the second frame 31 so as to face the magnet 35. Further, in order to detect the rotational positions of the first frame 22 and the lens barrel 12 in the pitching direction, a Hall element 36a is provided on the stator flat plate 36 facing the magnet 35.

An angular velocity sensor 38 for detecting the angular velocity in the panning direction is fixed to the lens barrel 12, and the angular velocity in the pitching direction of the lens barrel 12 and the first frame 22 is detected in the first frame 22. The angular velocity sensor 39 for is fixed. The control circuit 21 controls the magnet 26 and the stator winding 28 that rotate the lens barrel 12 in the panning direction so that the output signals of the angular velocity sensors 38 and 39 become zero.
And an actuator 40 including a magnet 35 for rotating the lens barrel 12 and the first frame 22 in the pitching direction, and an actuator 41 including a stator winding 37.
Is configured to be driven and controlled.

When the rotary member 14 holding the lens barrel 12 and the image pickup device 13 is locked, by turning on the operation button 42, the control circuit 21 is fixed to the lock base 43 attached to the flange 17. Power is supplied to the motor 44
44 rotates. The rotation force of this motor 44 locks the base 43
It is transmitted to a first lock gear 48 provided on a first lock shaft 47 via a reduction mechanism composed of idler gears 45 and 46 planted in the. The first lock shaft 47 is slidably engaged with the first support member 49, and the first cam groove 49a provided in the first support member 49 is provided with the first lock shaft 47. It engages with a first cam pin 47a provided on the above and guides the movement of the first lock shaft 47. The shape of the end of the first lock shaft 47 is spherical, and the lens barrel 12 is locked by coming into contact with the conical recess 54 provided in the exterior 53. Further, it is transmitted to the second lock gear 51 provided on the second lock shaft 50 via the first lock gear 48, and the second lock shaft 50 is slidable with the second support member 51. The second cam groove 52a provided in the second support member 51 is engaged with the second lock shaft 5 as described above.
The second lock shaft 50 that engages with the second cam pin 50a provided on the
Is guiding the movement of. The end shape of the second lock shaft 50 is a spherical surface, and a cam groove 14b (see the cam curve in FIG. 4) provided at the rear of the rotating member 14 holding the image pickup device 13 is provided. The rotating member 14 is locked by abutting. Here, the image blur prevention effect in the pitching direction, the panning direction and the rolling direction is turned on, and the lock of the lens barrel 12 and the rotating member 14 is released when the video camera is used.

Regarding the imaging device configured as described above, the first
The operation will be described with reference to FIGS.

When hand-held shooting is performed with a video camera, the video camera shakes due to camera shake or fatigue, which causes shaking of a shot image (so-called image blur). The shaking of the lens barrel 12 and the rotating member 14 associated with this video camera is detected by the angular velocity sensors 38 (panning direction) and 39 (pitching direction) so that the outputs from the angular velocity sensors 38 and 39 become zero. The control circuit 21 supplies electric power to the stator windings 28, 37 of the actuators 40, 41 to control the stator windings 28, 37 so that the image pickup device 13 does not shake with respect to the absolute coordinates and the horizontal and vertical image blurring is reduced. You can Furthermore, the lens barrel 12
If the lens swings in the rolling direction (the direction of rotation is the arrow R direction), the rotating member 14 holding the image pickup device 13 is configured to be rotatable between the frame 17 and the lens barrel 12, and the rotating member 14 Since the center of gravity is eccentric so that the horizontal axis of the imaging coordinates of the image sensor 13 always coincides with the horizontal axis of the absolute coordinates, the rotating member 14 causes the horizontal axis of the imaging coordinates of the image sensor 13 to be absolute due to gravity. It is biased in one direction to always match the horizontal axis of the coordinates. Therefore, it is possible to prevent the image blur in the rolling direction by rotating in the direction opposite to the arrow R direction. Also, rotate diagonally (rotation direction is arrow R)
If such blurring occurs, the angular velocity sensor 38
The control circuit 21 fixes the actuators 40 and 41 so that the amount of shake (angular velocity) is detected by the angular velocity sensor 33 (pitching direction) and the output from the angular velocity sensors 38 and 39 in both directions becomes zero. A rotating member that supplies power to the child windings 28 and 37 and holds the image pickup device 13.
14 is configured to be rotatable with the flange 17 and the lens barrel 12, and the rotating member 14 is so arranged that the horizontal axis of the image pickup coordinates of the image pickup device 13 always coincides with the horizontal axis of the absolute coordinate due to gravity. Since it is biased in one direction, it rotates in the direction opposite to the arrow R direction, and can suppress image blur in the rolling direction, thus suppressing image blur even with image blur that rotates in an oblique direction. it can.

Here, turn on the operation button 42 to turn off the image blur prevention effect.
To turn on, the control circuit 21 supplies power to the motor 44 to rotate the motor 44. The rotational force of the motor 44 is transmitted to the first lock gear 47 provided on the first lock shaft 47 via the reduction mechanism including the idler gears 45 and 46, and the first cam pin provided on the first lock shaft 47. 47a moves the first lock shaft 47 in the optical axis direction (direction of arrow H) by using the first cam groove 49a of the first support member 49 as a guide to move the second lock shaft into the concave portion 54 provided in the exterior 53. The lens barrel 12 is locked by the contact of 50. Further, the second cam pin 50a provided on the second lock shaft 50 is transmitted to the second lock gear 51 provided on the second lock shaft 50 via the first lock gear 47.
Indicates the second lock shaft 50 with the second cam groove 51a of the second support member 51 as a guide in the optical axis direction (direction opposite to the arrow H direction).
To the cam groove 14b provided at the rear of the rotating member 14
Lock shaft 50 contacts and presses to lock the rotating member 14 (first
See figure (b)).

Also, turn off the operation button 42 to turn on the image blur prevention effect.
Then, the control circuit 21 first supplies power to the motor 44 to rotate the motor 44. The rotational force of the motor 44 is transmitted through the reduction gear mechanism including the idler gears 45 and 46 to the first
Is transmitted to the first lock gear 47 provided on the lock shaft 47 of
The first cam pin 47a provided on the first lock shaft 47 moves the first lock shaft 47 in the optical axis direction (the direction opposite to the arrow H) using the first cam groove 49a of the first support member 49 as a guide. Let Therefore, the first lock shaft 47 and the recess 54 provided in the exterior 53 are separated from each other, and the lens barrel 12 is unlocked. Further, it is transmitted to the second lock gear 51 provided on the second lock shaft 50 through the first lock gear, and the second cam pin 50a provided on the second lock shaft 50 is connected to the second support member 51. The second lock shaft 50 is moved in the optical axis direction (direction of arrow H) by using the second cam groove 51a provided in the guide. Therefore, the second lock shaft 50 and the cam groove 14b provided at the rear portion of the rotating member 14 are separated from each other, and the rotating member 14 and the lens barrel 12 are unlocked.
Therefore, the image blur prevention state is set.

In this embodiment, the lock shaft is moved by the cam, but it may be moved by a screw or the like.

Further, in the present embodiment, the ball bearing 19 is press-fitted into the lens barrel 12 and fitted with the rotating member 14, but it may be press-fitted into the rotary member 14 and fitted with the lens barrel 12.

Further, in the present embodiment, the rotating member having the eccentric center of gravity is used as the biasing means, but it may be electrically controlled.

As described above, according to the present embodiment, the photographing lens for photographing the subject, the lens barrel for holding the photographing lens, the photoelectric conversion unit for converting an optical image from the photographing lens into an electric signal, and the photoelectric conversion unit are provided. Holding means for holding and first holding means for rotatably supporting the holding means so as to be rotatable around the optical axis about the optical axis.
Rotation supporting means, biasing means for biasing the holding means so that the horizontal axis of the absolute coordinates and the horizontal axis of the photographing coordinates of the photoelectric conversion means coincide with each other, the optical axis of the photographing lens and the optical axis of the photoelectric conversion means. A supporting means for supporting the lens barrel and the holding means in such a manner that they coincide with each other, a second rotating support means for rotatably supporting the supporting means in a panning direction (or a pitching direction), and a supporting means. First driving means for driving in the panning direction (or pitching direction), first locking means for locking the rotation of the support means, and second locking means for locking the rotation of the holding means. Since the first locking means and the second driving means for driving the second locking means are included, image blurring in the pitching direction, the panning direction and the rolling direction can be suppressed. In addition, since a large and heavy gyro as in the past is not used, it is easy to make it small and lightweight, and the photographer can use it while holding it. In addition, since the shooting coordinates of the camera body and the optical axis of the shooting lens coincide with each other when locked, it is possible to shoot without a sense of discomfort even after locking. Furthermore, when carrying the lens barrel, the lens barrel does not come into contact with the exterior or the like, and the wiring from the rotating member is not twisted, so that the lens barrel can be carried with ease.

EFFECTS OF THE INVENTION As described above, a taking lens for taking an image of a subject, a lens barrel for holding the taking lens, a photoelectric conversion unit for converting an optical image from the taking lens into an electric signal, and a holding unit for holding the photoelectric conversion unit. Means, and first rotation support means for rotatably supporting the holding means rotatably around the optical axis about the optical axis,
Energizing means for urging the holding means so that the horizontal axis of the absolute coordinates and the horizontal axis of the photographing coordinates of the photoelectric conversion means coincide with each other, and the lens mirror so that the optical axis of the photographing lens and the optical axis of the photoelectric conversion means coincide with each other. Supporting means for supporting the body and the holding means, second rotation supporting means for rotatably supporting the supporting means in the panning direction (or pitching direction), and the supporting means for panning direction (or pitching direction) First to drive
Driving means, first locking means for locking the rotation of the support means, second locking means for locking the rotation of the holding means, first locking means and second locking means. The second driving means for driving the stopping means can prevent the image blurring in the pitching direction, the panning direction and the rolling direction. In addition, since a large and heavy gyro as in the past is not used, it is easy to make it small and lightweight, and the photographer can use it while holding it. In addition, since the shooting coordinates of the camera body and the optical axis of the shooting lens coincide with each other when locked, it is possible to shoot without a sense of discomfort even after locking. Furthermore, when carrying the lens barrel, the lens barrel does not come into contact with the exterior or the like, and the wiring from the rotating member is not twisted, so that the lens barrel can be carried with ease.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an image pickup apparatus in an embodiment of the present invention, FIG. 2 is a sectional view taken along line XX in FIG. 1, FIG. 3 is a cam curve diagram provided on a rotating member, and FIG. Front view of imager, No. 5
The figure is a side view of a conventional photographing apparatus. 12 ... Lens barrel, 13 ... Photoelectric conversion means, 14 ... Rotating member (biasing means) 40, 41 ...... Actuator, 47, 50 ......
First locking means, 14b, 50 ... Second locking means.

Claims (2)

[Claims] 1. A photographing lens for photographing an object, a lens barrel for holding the photographing lens, a photoelectric conversion unit for converting an optical image from the photographing lens into an electric signal, and a holding unit for holding the photoelectric conversion unit. Means, first rotation supporting means for rotatably supporting the holding means so as to be rotatable about the optical axis about the optical axis, horizontal axis of absolute coordinates of the holding means, and photographing coordinates of the photoelectric conversion means. Urging means for urging the lens barrel and the holding means so that the optical axis of the photographing lens and the optical axis of the photoelectric conversion means coincide with each other. Second rotation supporting means for rotatably supporting the supporting means in a panning direction or a pitching direction, a first driving means for driving the supporting means in the panning direction or the pitching direction, and the supporting means. of A first locking means for locking the movement,
It is characterized by further comprising: second locking means for locking the rotation of the holding means; and second driving means for driving the first locking means and the second locking means. Imaging device. 2. The locking means comprises operating means for operating the locking means, and control means for controlling the locking means to lock the holding means when the operating means is operated. The image pickup apparatus according to item 1 above.