JPH0628408B2 - Imaging device - Google Patents

Description

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

2. Description of the Related Art In recent years, with the spread of video tape recorders (hereinafter referred to as VTRs), there are more opportunities to shoot with a video camera, and it is possible to perform stable camera work with less image blur even without using a tripod. Video camera is required.

Hereinafter, an example of the above-described conventional imaging device will be described with reference to the drawings. Conventionally, a photographing apparatus of this type has a structure as shown in FIGS. 3 and 4, for example, as disclosed in Japanese Patent Laid-Open No. 53-64175. FIG. 3 is a front view of a conventional photographing apparatus, and FIG. 4 is a side view. 3 and 4
In the figure, there is a rotor case 1 having a built-in 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 is vertically supported by left and right gimbal shafts 4. It is supported by the gimbal 5. 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.

Problems to be Solved by the Invention However, in the above-described configuration, since the gyro that rotates at high speed is used, the device becomes large in size and the weight also increases. Therefore, normally, the entire device must be installed and used. In addition to the problem of lack of mobility, when handheld shooting is performed and it is not necessary to prevent image blur, it is sufficient to stop the image blur prevention means such as a gyro. There is a problem in that the horizontal gimbals 3 and 7 and the vertical gimbals 5 and 8 lose their stability, and the video camera becomes unstable, making it difficult to carry.

Means for Solving the Problems In order to solve the above problems, the present invention relates to a photographing lens for photographing a subject, a photoelectric conversion unit for converting an optical image from the photographing lens into an electric signal, a photographing lens and photoelectric conversion. Holding means for integrally holding the means so that the optical axes thereof coincide with each other,
Rotation supporting means for rotatably supporting the holding means so as to be rotatable in the panning direction or the pitching direction, detection means for detecting the movement of the holding means, and the holding means so that the detection signal of the detection means becomes small. Driving means for rotating the holding means, locking means for locking the holding means so as not to rotate, operating means for switching between recording mode and non-recording mode, and locking means for switching the operating means to non-recording mode. It is composed of control means for controlling so as to operate.

Effect The present invention does not use a large and heavy gyro as in the related art due to the above-mentioned configuration, so that it is easy to make the device small and lightweight, and the photographer can use it by hand.
Further, in the non-recording mode of the camera body, the lens barrel is fixed to the camera body, and the lens barrel does not come into contact with the exterior or the like, so that the lens barrel can be carried around with peace of mind.

Embodiment Hereinafter, an image pickup apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of the entire imaging device,
FIG. 2 is a sectional view taken along line XX of FIG.

First, the overall configuration of the image capturing apparatus will be described with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, a taking lens 21 for taking an image of a subject and an image pickup device 22 such as a CCD provided on the focal plane of the taking lens are held by a lens barrel 23. Also,
The electric signal converted from the optical image by the image pickup device 22 is converted into a predetermined video signal by the video circuit 24. Lens barrel 23
Ball bearings 25 and 26 are press-fitted into the upper part 23a and the lower part 23b of the first frame 27, respectively.
28 and 29 are rotatably fitted to the ball bearings 25 and 26, and the lens barrel 23 is rotatable with respect to the first frame 27. Further, a ring-shaped magnet 31 that is magnetized as required is fixed to a lower portion 23b of the lens barrel 23 via a back plate 30 made of a magnetic material. Its magnet 31
A stator winding 33 adhered to a stator flat plate 32 made of a magnetic material is fixed to the first frame 27 so as to face the.

Further, in order to detect the rotational position of the lens barrel 23, a hall element 32a is provided on the stator flat plate 32 so as to face the magnet 31. Ball bearings 34 and 35 are press-fitted into the left and right sides of the first frame 27, respectively, and rotary shafts 37 and 38 are rotatably fitted into the ball bearings 34 and 35 from the left and right sides of the second frame 36, respectively. The cage lens barrel 23 and the first frame 27 are
It is rotatable with respect to the frame 36. On the right side of the first frame 27, a back plate made of a magnetic material.
A ring-shaped magnet with the required magnetization through 39
40 is fixed. The second facing the magnet 40
A stator winding 42 adhered to a stator flat plate 41 made of a magnetic material is fixed to the frame 36. Further, in order to detect the rotational positions of the first frame 27 and the lens barrel 23 in the tilting direction, the stator flat plate 41 faces the magnet 40.
The hall element 41a is provided in the. An angular velocity sensor 43 for detecting the angular velocity in the panning direction is fixed to the lens barrel 23, and the angular velocity in the tilting direction of the lens barrel 23 and the first frame 27 is detected in the first frame 27. The angular velocity sensor 44 for doing so is fixed. The control circuit 45 so that the output signals of the angular velocity sensors 43 and 44 become zero, the actuator 46 including the magnet 31 and the stator winding 33 that rotate the lens barrel 23 in the panning direction, the lens barrel 23, First frame
An actuator 47 composed of a magnet 40 and a stator winding 42 for rotating the 27 in the tilting direction is drive-controlled.

When locking the lens barrel 23, by turning on the lock switch 50, power is supplied from the control circuit 45 to the motor 52 fixed to the lock base 51, and the motor 52 rotates. The rotational force of the motor 52 is transmitted to the lock gear 56 provided on the lock shaft 55 via a reduction mechanism including idler gears 53 and 54 provided on the lock base 51. Lock shaft
55 is slidably engaged with the support member 57, and the cam groove 57a provided in the support member 57 is engaged with the cam pin 55a provided in the lock shaft 55 to guide the movement of the lock shaft 55. ing.

The end shape of the lock shaft 55 is spherical, and the optical axis of the lens barrel 23 and the photographing axis of the camera body coincide with each other by contacting the conical recess 58 provided in the rear portion of the lens barrel 23. Lock the lens barrel 23 as follows. The conical recess 58 provided in the rear portion of the lens barrel 23 is sized so as to come into contact with the lock shaft 55 in the rotation range of the lens barrel 23.

Further, the control circuit 45 is connected to the operation switch 60 for switching the video camera body between the recording mode and the non-recording mode, and when the operation switch 60 is switched to the non-recording mode, the lens barrel 23 is operated in the same manner as the above-mentioned operation. It's locked.

That is, when the video camera body is in the recording mode, the lens barrel 23 can be locked or unlocked with the lock switch 50.

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 vibration of the lens barrel 23 caused by this video camera is detected by the angular velocity sensor 43 (panning direction), 44
(Tilting direction), the control circuit 45 supplies electric power to the stator windings 33, 42 of the actuators 46, 47 so that the outputs from the angular velocity sensors 43, 44 become zero. Lens barrel for absolute coordinates
23 shaking is eliminated and horizontal and vertical image blur can be reduced. For example, if the lens barrel 23 shakes in the tilting direction (direction of arrow I in FIG. 1),
The control circuit 45 is an actuator so that the output of the angular velocity sensor 44 that detects the swing in the tilting direction becomes zero.
By supplying electric power to the stator winding 42 of 47 to control the drive in the direction opposite to the arrow I direction, image blurring in the tilting direction can be prevented. Similarly, in the panning direction, image blur can be prevented. If image blurring occurs in the diagonal direction, the angular velocity sensor 43 (panning direction),
The angular velocity sensor 44 (tilting direction) detects the amount of shake (angular velocity), and the angular velocity sensors 43, 4 in both directions are detected.
The control circuit 45 supplies electric power to the stator windings 33 and 32 of the actuators 46 and 47 so that the output from 4 becomes zero, so that the image blur in the diagonal direction can be prevented.

When carrying around or turning off the image blur prevention effect,
When the lock switch 50 is turned on or the operation switch 60 is set to the non-recording mode, the control circuit 45 supplies electric power to the motor 52 to rotate the motor 52. The rotational force of the motor 52 is transmitted to the lock gear 56 provided on the lock shaft 55 via the reduction mechanism including the idler gears 53 and 54, and the cam pin 55a provided on the lock shaft 55 is locked using the cam groove 57a of the support member 57 as a guide. The shaft 55 is moved in the optical axis direction (arrow H direction) and the lock shaft 55 is brought into contact with a conical recess 58 provided in the rear portion of the lens barrel 23, so that the optical axis of the lens barrel 23 and the subject of the camera body Lock to match the shooting axis. When the lock is completed, the control circuit 45 cuts off the power supply to the actuators 46, 47 and the motor 52.

When the image blur prevention effect is turned on, the operation switch 60 is set to the recording mode, and the lock switch 50 is turned off. Then, the control circuit 45 first supplies power to the motor 52 to rotate the motor 52. Rotational force of the motor 52 is transmitted to the lock shaft 55 via a reduction mechanism composed of idler gears 53 and 54.
The cam pin 55a, which is transmitted to the lock gear 56 provided on the lock shaft 55, moves in the optical axis direction (the direction opposite to the arrow H) with the cam groove 57a of the support member 57 as a guide to move the cam pin 55a to the lock shaft 55. The lens barrel 23 is unlocked by separating it from the conical recess 58 provided in the rear portion of the lens barrel 23. After that, the control circuit 45 supplies power to the actuators 46 and 47 to enter the image blur prevention state.

As described above, according to the present embodiment, the taking lens for taking an image of a subject, the photoelectric conversion means for converting an optical image from the taking lens into an electric signal, and the taking lens and the photoelectric conversion means are provided with optical axes. Holding means for integrally holding so as to match, rotation supporting means for rotatably supporting the holding means in a panning direction or a pitching direction, a detecting means for detecting a movement of the holding means, and Drive means for rotating the holding means so that the detection signal of the detection means becomes small; locking means for locking the holding means so as not to rotate; operating means for switching between a recording mode and a non-recording mode; By configuring the control means so that the locking means locks when the operation means is switched to the non-recording mode, the overall size and weight of the image capturing apparatus can be reduced, and handheld shooting can be performed easily. It can be.

Also, by setting the camera body to the non-recording mode, the lens barrel is locked so that the lens barrel can be carried around without wobbling.

EFFECTS OF THE INVENTION As described above, the taking lens for taking an image of a subject, the photoelectric conversion means for converting an optical image from the taking lens into an electric signal, and the taking lens and the photoelectric conversion means have the same optical axis. Holding means for integrally holding the holding means, detecting means for detecting the movement of the holding means for rotatably supporting the holding means in a panning direction or a pitching direction, and a detection signal of the detecting means becomes small. As described above, when the driving means for rotating the holding means, the locking means for locking the holding means so as not to rotate, the operating means for switching between the recording mode and the non-recording mode, and the operating means for switching to the non-recording mode The control means for controlling the locking means to perform the locking operation ensures that the lens barrel is fixed to the camera body when the video camera body is in the non-recording mode. Since the lens barrel does not fluctuate and the lens barrel does not come into contact with the exterior, it is possible to eliminate anxiety during operation and to provide a highly reliable imaging device.

[Brief description of drawings]

FIG. 1 is a block diagram of an image pickup apparatus in an embodiment of the present invention,
FIG. 2 is a sectional view taken along the line XX in FIG. 1, FIG. 3 is a front view of a conventional photographing device, and FIG. 4 is a side view of the conventional photographing device. 21 …… Shooting lens, 22 …… CCD, 23 …… Lens barrel,
45 …… Control circuit, 50 …… Lock switch, 52 …… Motor, 55 …… Lock shaft, 58 …… Conical recess, 60 …… Operation switch.

Claims (1)

[Claims] 1. A photographic lens for photographing a subject, a photoelectric conversion means for converting an optical image from the photographic lens into an electric signal, and the photographic lens and the photoelectric conversion means are integrated so that their optical axes coincide with each other. Holding means for holding the holding means, rotation supporting means for rotatably supporting the holding means in a panning direction or a pitching direction, a detecting means for detecting the movement of the holding means, and a detection signal of the detecting means. Driving means for rotating the holding means so as to be small, locking means for locking the holding means so as not to rotate, operating means for switching between recording mode and non-recording mode, and the operating means for non-recording mode. And a control unit that controls the locking unit to lock when switched to.