JPS61294974A - Photographing device - Google Patents

Abstract

PURPOSE:To constitute a device in a small size and in light weight and to operate with hands of an operator by not using a large and weighty gyro. CONSTITUTION:With detecting the shaking of a lens barrel 23 due to that of a video camera by angular velocity sensors 43 (panning direction) and 44 (tilting direction) and controlling a control circuit 45 to supply power to stator windings 33 and 42 in actuators 46 and 47 and to control so that outputs from the angular velocity sensors 43 and 44 become zero, the shaking of the lens barrel 23 against absolute co-ordinate is eliminated and it is possible to reduce picture shaking in horizontal and vertical directions. To carry it with hands or to turn off the preventive effect of the picture shaking, with turning on a lock switch 50, the control circuit 45 drives and controls the actuators 46 and 47 to the center of turning range (a position where the photographing axis of a camera main body and the optical axis of the lens barrel are coincided). Afterwards, the power is supplied to a motor 52 resulting the rotation of the motor 52.

Description

[Detailed description of the invention] Industrial applications TECHNICAL FIELD The present invention relates to a video camera.

In recent years, with the spread of videotape recorders (hereinafter referred to as VTRs), opportunities to use video cameras to take pictures have increased, and video cameras that allow stable camera work with less image blur without using a tripod. is requested.

2. Description of the Related Art Hereinafter, an example of the above-mentioned conventional photographing device will be described with reference to the drawings. Conventionally, this type of photographing apparatus has had a structure as shown in FIGS. 3 and 4, as shown in, for example, Japanese Patent Laid-Open No. 53-64175. FIG. 3 is a front view of a conventional photographing device, and FIG. 4 is a side view. Third
In Fig. 4, there is a rotor case 1 that houses a rotor that rotates at high speed in the center as a directional gyro.
This is supported by a horizontal gimbal 3 with left and right horizontal axes 2, and the horizontal gimbal 3 is further supported by a vertical gimbal 5 with left and right gimbal axes 4. Similarly to the vertical gyro, a rotor case 6 at the center is supported by a horizontal gimbal 7 and a vertical gimbal 8, and a video camera 9 and the like are installed on the rotor case 6.

Problems to be Solved by the Invention However, the above configuration uses a gyro that rotates at high speed, which increases the size and weight of the device, so normally the entire device must be installed and used. In addition to the problem of lack of mobility, when shooting hand-held and there is no need to prevent image blur, you can stop the image blur prevention means such as the gyro, but by stopping the gyro, There was a problem in that the horizontal gimbal 3.7 and the vertical gimbal 5.8 became ineffective and the stability of the horizontal gimbal 3.7 and the vertical gimbal 5.8 was lost and the video camera became unstable, making it difficult to determine the direction in which to shoot.

Means for Solving the Problems In order to solve the above problems, the present invention provides a photographic lens for photographing a subject, a photoelectric conversion means for converting an optical image from the photographic lens into an electrical signal, and a combination of the photographic lens and the photoelectric conversion. a holding means for integrally holding the means so that their optical axes coincide with each other;
A rotational support means that rotatably supports the holding means in a bunning direction or a pitching direction, a first driving means that drives the holding means in the panning direction or a pitching direction, and a rotational position of the holding means is detected. A first detection means, a locking means for locking the holding means, a second driving means for driving the locking means, and a rotation range of the holding means by the first detection means and the first driving means. The second driving means is driven to an intermediate position, and the holding means is controlled to be locked by driving the second driving means, and an operating means for operating the control means.

Effects The present invention does not use a large and heavy gyro as in the prior art due to the above-described configuration, so it can be easily constructed to be small and lightweight, and can be used hand-held by the photographer.

Furthermore, by locking the lens barrel, the photographing axis of the camera body and the optical axis of the photographing lens coincide, so that even after locking, you can take photographs without feeling any discomfort. Furthermore, when carrying the lens, the lens barrel does not come into contact with the exterior, etc., so you can carry it with peace of mind.

Embodiment Hereinafter, a photographing 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 photographing device, and FIG. 2 is a sectional view taken along line XX in FIG.

First, the overall configuration of the photographing device will be explained with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, a photographic lens 21 for photographing a subject and an image sensor 22 such as a CCD provided on the focal plane of the photographic lens are held in a lens barrel 23.

Further, the electrical signal converted from the optical image by the photographing element 22 is converted into a predetermined video signal by the video circuit 24. Ball bearings 25 and 26 are press-fitted into the upper part 23a and lower part 23b of the lens barrel 23, respectively, and the first frame 27
Rotating shafts 28.29 from above and below are ball bearings 25.2, respectively.
The lens barrel 23 is rotatably fitted into the first
It is rotatable with respect to the frame 27 of. Also,
A ring-shaped magnet 31 is fixed to the lower part 23b of the lens barrel 23 via a back plate 30 made of a magnetic material. A stator winding a 33 is fixed to the first frame 27 facing the magnet 31 and is bonded to a stator flat plate 32 made of a magnetic material.

In addition, in order to detect the rotational position of the lens barrel 23, a Hall element 3 is mounted on the stator flat plate 32 facing the magnet 31.
2a is provided. Ball bearings 34.35 are press-fitted into the left and right sides of the first frame 27, respectively, and rotation shafts 37.38 are rotatably fitted into the ball bearings 34.35 from the left and right sides of the second frame 36, respectively. The lens barrel 23 and the first frame 27 are fitted together and are rotatable with respect to the second frame 36. In addition, the first frame 27
A ring-shaped magnet 40, which is magnetized as required, is fixed to the right side of the magnet 40 via a back plate 39 made of a magnetic material. A stator winding 42 is fixed to the second frame 36 facing the magnet 40 and is bonded to a stator flat plate 41 made of a magnetic material. Further, in order to detect the rotational position of the first frame 27 and the lens barrel 23 in the tilting direction, a Hall element 41a is provided on the stator flat plate 41 facing the magnet 40. An angular velocity sensor 43 for detecting the angular velocity in the panning direction is fixed to the lens barrel 23, and an angular velocity sensor 43 for detecting the angular velocity in the tilting direction of the lens barrel 23 and the first frame 27 is fixed to the first frame 27. An angular velocity sensor 44 is fixed. This angular velocity sensor 43.4
The control circuit 45 controls the magnet 3 to rotate the lens barrel 23 in the panning direction so that the output signal of the magnet 3 becomes zero.
1, stator winding 33, etc.
and a magnet 40 and stator winding 4 that rotate the lens barrel 23 and first frame 27 in the tilting direction.
The actuator 47, which is composed of two actuators, is driven and controlled.

To lock the lens barrel 23, press the lock switch 5.
By turning on 0, power is supplied from the control circuit 45 to the motor 52 fixed to the lock base 51, and the motor 52 rotates. The lock gear 5 installed on the lock shaft 55 transmits the rotational force of the motor 52 through a reduction mechanism consisting of idler gears 53 and 54 installed on the lock base 51.
6. The lock shaft 55 is slidably engaged with the support member 57, and a cam groove 57a provided in the support member 57 engages with a cam pin 55a provided in the lock shaft 55 to prevent movement of the lock shaft 55. I'm guiding.

The end of the lock shaft 55 has a spherical shape, and locks the lens barrel 23 by coming into contact with a conical recess 58 provided at the rear of the lens barrel 23.

The operation of the photographing apparatus configured as described above will be described below with reference to FIGS. 1 and 2.

When hand-held shooting is performed with a video camera, the camera shakes due to camera shake or fatigue, resulting in shaking of the shot image (so-called image blur). The shaking of the lens barrel 23 accompanying this video camera is detected by the angular velocity sensor 43 (in the panning direction).
), 44 (tilting direction) and the control circuit 45 supplies power to the stator winding 33.42 of the actuator 46.4-7 so that the output from this angular velocity sensor 43.44 becomes zero. By controlling this, the shaking of the lens barrel 23 with respect to the absolute coordinates is eliminated, and image blur in the horizontal and vertical directions can be reduced. For example, if the lens barrel 23 shakes in the tilting direction (arrow ■ direction in FIG. By supplying power to the stator winding 42 and controlling its drive in the direction opposite to the direction of arrow 1, image blur in the tilting direction can be prevented. Image blur can be similarly prevented in the panning direction. In addition, if image blurring occurs in the diagonal direction, the amount of shaking (angular velocity) is detected by the angular velocity sensor 43 (panning direction) and angular velocity sensor 44 (tilting direction), and the angular velocity sensor 43.4 in both directions detects the shaking amount (angular velocity).
The control circuit 45 winds the stators of actuators 46 and 47 so that the output from 4 becomes zero! By supplying power to 33 and 32, image blur in diagonal directions can also be prevented.

When carrying the camera or turning off the image stabilization effect,
When the lock switch 50 is turned on, the control circuit 45 first controls the actuators 46 and 47 to drive them to the center of the rotation range (the position where the shadow axis of the camera body and the optical axis of the lens barrel coincide). After that, power is supplied to the motor 52 to rotate the motor 52. motor 52
The rotational force is transmitted to the lock gear 56 provided on the lock shaft 55 through a reduction mechanism consisting of idler gears 53 and 54, and the cam pin 55a provided on the lock shaft 55 is transferred to the support member 5.
The lock shaft 55 is moved in the optical axis direction (in the direction of arrow H) using the cam groove 57a of No. 7 as a guide, and the lock shaft 55 is brought into contact with a conical recess 58 provided at the rear of the lens barrel 23 to close the lens barrel. Lock 23. When the lock is completed, the control circuit 45 cuts off the power supply to the actuators 46, 47 and the motor 52.

Further, when turning on the image blur prevention effect, when the lock switch 50 is turned off, the control circuit 45 first supplies power to the motor 52 and rotates the motor 52. The rotational force of the motor 52 is transmitted to the lock gear 56 provided on the lock shaft 55 via a reduction mechanism consisting of idler gears 53 and 54, and the cam pin 55a provided on the lock shaft 55 is transmitted to the lock gear 56 provided on the lock shaft 55.
The lock shaft 55 is moved in the optical axis direction (in the direction opposite to the arrow H) using the cam groove 57a of the support member 57 as a guide, and a conical recess 5 is formed at the rear of the lock shaft 55 and the lens barrel 23.
8 and the lens barrel 23 is placed in an unlocked state. The control circuit 45 then controls the actuators 46, 47
Power is supplied to the camera to prevent image blurring.

As described above, according to this embodiment, the photographic lens for photographing a subject, the photoelectric conversion means for converting an optical image from the photographic lens into an electrical signal, and the optical axes of the photographic lens and the photoelectric conversion means are arranged to coincide with each other. a holding means that integrally holds the holding means; a rotational support means that rotatably supports the holding means in a panning direction or a pitching direction; and a first driving means that drives the holding means in the panning direction or the pitching direction. , first detection means for detecting the rotational position of the holding means;
a locking means for locking the holding means, a second driving means for driving the locking means, the first detection means and the first
a control means for controlling the holding means to be driven by the driving means to a substantially intermediate position of the rotation range, and driving the second driving means to lock the holding means; and an operating means for operating the control means. As a result of this structure, the entire photographing device is small and lightweight, allowing for easy hand-held photographing. Furthermore, by locking the camera body, the photographing axis of the camera body and the optical axis of the photographing lens coincide, so that even after the lock is locked, it is possible to take photographs without any discomfort. Furthermore, when carrying the lens, the lens barrel does not come into contact with the exterior, etc., so you can carry it with peace of mind.

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

Effects of the Invention As described above, the photographic lens for photographing a subject, the photoelectric conversion means for converting the optical image from the photographic lens into an electrical signal, and the photographic lens and the photoelectric conversion means are integrated so that their optical axes coincide. a holding means for holding the holding means in the panning direction or the pitching direction; a rotation support means for rotatably supporting the holding means in the panning direction or the pitching direction; a first driving means for driving the holding means in the panning direction or the pitching direction; a first detection means for detecting the rotational position of the holding means; a locking means for locking the holding means; a second driving means for driving the locking means; comprising a control means for driving the means to a position approximately in the middle of the rotation range and driving the second driving means to lock the holding means; and an operation means for operating the control means. This makes the entire photographing device small and lightweight, making it easy to carry out handheld photography. Furthermore, by locking the camera body, the photographing axis of the camera body and the optical axis of the photographing lens coincide with each other, so that even after locking, the camera may feel strange or shake. Furthermore, when carrying the lens, the lens barrel does not come into contact with the exterior, etc., so you can carry it with peace of mind.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a photographing device in an embodiment of the present invention;
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... Photographing lens, 22... Photoelectric conversion means, 23... Lens barrel, 45...
・Control circuit, 46.47...Actuator, 50...Lock switch, 52...
Motor, 55...Lock shaft, 58...
・Conical recess.

Claims (1)

[Claims] A photographic lens for photographing a subject, a photoelectric conversion means for converting an optical image from the photographic lens into an electrical signal, and a holding means for integrally holding the photographic lens and the photoelectric conversion means so that their optical axes coincide. a rotating support means for rotatably supporting the holding means in a panning direction or a pitching direction; a first driving means for driving the holding means in the panning direction or a pitching direction; a first detection means for detecting the moving position; a locking means for locking the holding means; a second driving means for driving the locking means; A control means for driving the holding means to a position approximately in the middle of the rotation range and controlling the second driving means to lock the holding means; and an operation means for operating the control means. A photographic device.