JPH0578985B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a video camera.
In recent years, with the spread of video tape 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 even without the use of a tripod. is requested.

BACKGROUND 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. In FIGS. 3 and 4, there is a rotor case 1 containing a rotor that rotates at high speed in the center as a direction gyroscope, and this is supported by a horizontal gimbal 3 with left and right horizontal shafts 2.
Further, the horizontal gimbal 3 is supported by a vertical gimbal 5 by left and right gimbal shafts 4. Similarly, the rotor case 6 at the center of the vertical gyro 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 gyroscope 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 when there is no need to prevent image blur, it is possible to stop the image blur prevention means such as a gyro. There was a problem that the horizontal gimbals 3, 7 and the vertical gimbals 5, 8 lost their effectiveness, 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 photoelectric conversion means for converting an optical image from the photographic lens into an electrical signal. a holding means for integrally holding the photoelectric conversion means so that their optical axes coincide with each other; a rotational support means for rotatably supporting the holding means so as to be rotatable in a panning direction or a pitching direction; a rocking detection means for detecting rocking; a first driving means for driving the holding means in a panning direction or a pitching direction; and driving control of the first driving means in accordance with a detection signal of the rocking detection means. a first control circuit for detecting the rotational position of the holding means, a locking means for locking the holding means, an operating means for operating the locking means, and a driving means for driving the locking means. and a second drive means for detecting the first detection means based on the detection signal of the first detection means by the operation signal of the operation means.
and a second control circuit that controls the holding means to drive the holding means to a substantially intermediate position of the rotation range, and drives the second driving means to lock the holding means. It is what was done.

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 the photographer can use it hand-held. Furthermore, by locking the lens barrel, the photographing axis of the camera body and the optical axis of the photographing lens are aligned, so that even after locking, 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 confidence.

Embodiment A photographing apparatus according to an embodiment of the present invention will be described below 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 connected to a lens barrel 2.
It is held at 3. Further, the electrical signal converted from the optical image by the image sensor 22 is transmitted to the video circuit 24.
is converted into a predetermined video signal. Lens barrel 23
Ball bearings 25 and 26 are press-fitted into the upper part 23a and lower part 23b of the first frame 27, respectively.
Rotating shafts 28 and 29 are respectively mounted on ball bearings 2 from above and below.
5 and 26, and the lens barrel 23 is rotatably fitted to the first frame 27. In addition, the lower part 23b of the lens barrel 23
A ring-shaped magnet 31, which is magnetized as required, is fixed to the ring via a back plate 30 made of a magnetic material. A stator winding 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 stator plate 32 is placed opposite the magnet 31.
A Hall element 32a is provided at . Ball bearings 34 and 3 are provided on the left and right sides of the first frame 27, respectively.
5 is press-fitted into the second frame 36, and rotation shafts 37, 38 are fitted with 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 rotatably fitted to the second frame 36 . Also, on the right side of the first frame 27 is a back plate 39 made of magnetic material.
A ring-shaped magnet 40, which has been magnetized as required, is fixed thereto. This magnet 40
A stator winding 42 bonded to a stator flat plate 41 made of a magnetic material is fixed to the second frame 36 opposite to the stator winding 42 . 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 angular velocity in the panning direction is fixed to the lens barrel 23, and the first frame 27 has an angular velocity sensor 43 fixed to the lens barrel 23.
An angular velocity sensor 44 for detecting the angular velocity of the first frame 3 and the first frame 27 in the tilting direction is fixed. In order to make the output signals of the angular velocity sensors 43 and 44 zero, the control circuit 45 operates an actuator 46 consisting of a magnet 31, a stator winding 33, etc., which rotates the lens barrel 23 in the panning direction, and a lens barrel 23. 23 and the first frame 27 in the tilting direction, and an actuator 47 consisting of a magnet 40 and a stator winding 42 is driven and controlled.

When locking the lens barrel 23, turn on the lock switch 50 to lock the control circuit 45.
Power is supplied to the motor 52 fixed to the lock base 51, and the motor 52 rotates. The rotational force of this motor 52 is transmitted to a lock gear 56 provided on a lock shaft 55 via a speed reduction mechanism consisting of idler gears 53 and 54 embedded in a lock base 51. The lock shaft 55 is slidably engaged with a 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.

Further, the end shape of the lock shaft 55 is spherical,
A conical recess 58 provided at the rear of the lens barrel 23
The lens barrel 23 is locked by coming into contact with 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 sensors 43 (panning direction) and 44 (tilting direction).
The control circuit 45 supplies power to the stator windings 33, 42 of the actuators 46, 47 so that the outputs from the actuators 3, 44 are zero, thereby controlling the lens barrel 23 with respect to absolute coordinates. This eliminates shaking and reduces image blur in the horizontal and vertical directions. For example, if the lens barrel 23 shakes in the tilting direction (in the direction of the arrow in FIG. 1), the control circuit 45 fixes the actuator 47 so that the output of the angular velocity sensor 44 that detects the shaking in the tilting direction becomes zero. Child winding line 4
By supplying power to 2 and controlling the drive in the direction opposite to the direction of the arrow, 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 angular velocity sensor 43
(panning direction) and angular velocity sensor 44 (tilting direction) to detect the amount of shaking (angular velocity), and control circuit 45 controls actuators 46 and 47 so that outputs from angular velocity sensors 43 and 44 in both directions become zero. By supplying power to the stator windings 33 and 32, it is possible to prevent image blurring in diagonal directions.

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 align the center of the rotation range (the shooting axis of the camera body and the lens mirror). The drive is controlled to a position where the optical axis of the cylinder coincides. After that, power is supplied 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 through a reduction mechanism consisting of idler gears 53 and 54, and the cam pin 55a provided on the lock shaft 55 is rotated using the cam groove 57a of the support member 57 as a guide. 55 in the optical axis direction (in the direction of arrow H), the lock shaft 55 is brought into contact with a conical recess 58 provided at the rear of the lens barrel 23, and the lens barrel 23 is locked. When the lock is completed, the control circuit 45 cuts off the power supply to the actuators 46, 47 and the motor 52.

In addition, when turning on the image blur prevention effect, when the lock switch 50 is turned off, the control circuit 45
First, power is supplied to the motor 52 and the motor 52 is rotated. The rotational force of the motor 52 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 rotated using the cam groove 57a of the support member 57 as a guide. 55 in the optical axis direction (in the direction opposite to arrow H), the lock shaft 55 is separated from the conical recess 58 provided at the rear of the lens barrel 23, and the lens barrel 23 is brought into an unlocked state. 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 this embodiment, 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 an optical axis between the photographic lens and the photoelectric conversion means are A holding means that integrally holds the holding means in a matching manner, a rotational support means that rotatably supports the holding means so as to be rotatable in a panning direction or a pitching direction, and a swing detection means that detects swinging of the holding means. a first driving means for driving the holding means in a panning direction or a pitching direction; a first control circuit for driving and controlling the first driving means in accordance with a detection signal from the swing detecting means; a first detection means for detecting the rotational position of the holding means; a locking means for locking the holding means; an operating means for operating the locking means; a second driving means for driving the locking means; The first drive means drives the holding means to a substantially intermediate position of the rotation range based on the detection signal of the first detection means according to the operation signal of the operation means, and the second drive means and a second control circuit for driving the holding means and locking the holding means, the photographing apparatus as a whole becomes small and lightweight, and can easily be used for 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 locking the camera, it is possible to take photographs without any discomfort. Furthermore, by driving the lens barrel around its rotational center and then locking it, the locking mechanism can be made compact. 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, 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 photoelectric conversion means for aligning the optical axes of the photographic lens and the photoelectric conversion means with each other. a holding means for integrally holding the holding means, a rotation support means for rotatably supporting the holding means so as to be rotatable in the panning direction or the pitching direction, a swing detection means for detecting the swing of the holding means; a first driving means for driving the holding means in a panning direction or a pitching direction; a first control circuit for driving and controlling the first driving means in accordance with a detection signal of the swing detecting means; a first detection means for detecting a rotational position; a locking means for locking the holding means; an operating means for operating the locking means; a second driving means for driving the locking means; The first drive means drives the holding means to a substantially intermediate position of the rotation range based on the detection signal of the first detection means according to an operation signal, and the second drive means is driven. By including the second control circuit for controlling the locking of the holding means, the entire photographing apparatus becomes small and lightweight, and hand-held photographing can be easily carried out. 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 locking the camera, it is possible to take photographs without any discomfort. Furthermore, by driving the lens barrel around its rotational center and then locking it, the locking mechanism can be made compact. 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 drawings]

FIG. 1 is a configuration diagram of an imaging device in an embodiment of the present invention, FIG. 2 is a sectional view taken along line XX in FIG. 1, and FIG.
The figure 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 axis, 5
8...Conical recess.

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 electrical signal, and a holding unit for integrally holding the photographic lens and the photoelectric conversion means so that their optical axes are aligned. a rotating support means for rotatably supporting the holding means in a panning direction or a pitching direction; a swing detecting means for detecting swinging of the holding means; a first drive means for driving in the direction; a first control circuit for driving and controlling the first drive means according to a detection signal of the swing detecting means; and a first control circuit for detecting the rotational position of the holding means. a first detection means, a locking means for locking the holding means, an operating means for operating the locking means, a second driving means for driving the locking means, and a first detection means for locking the holding means; Based on the detection signal of the detection means, the first driving means drives the holding means to a substantially intermediate position of the rotation range, and the second driving means is driven to lock the holding means. A photographing device comprising a second control circuit that controls.