JPS6271384A - Photographing device - Google Patents

Abstract

PURPOSE:To make the titled device small in size and light in weight and also to stabilize the photographing direction by constituting a holding means for taking the gravity center of a lens barrel, a photoelectric conversion means and the holding means as the turning center with a turning support means for supporting freely turnably in the panning direction or pitching direction and a center gravity correcting means. CONSTITUTION:In photographing a video camera held in hand, the shaking of the lens barrel 55 attended with video camera movement is detected by angular velocity sensors 88 (panning direction) and 89 (tilting direction) and a control circuit 90 applies power to stator windings 79, 86 of actuators 91, 92 to control the output to be zero, then the shaking to the absolute coordinate is lost and the picture blur in horizontal/vertical directions is reduced. When the picture blur preventing effect is set and zooming is applied, although the gravity center of the lens barrel 55 is moved by the movement of lens holding frames 32, 37, the ring weight 56 guided to focus and guide shafts 26, 59 turns a zoom ring 51 to be moved in a direction opposite to the gravity center moving direction together with a cam pin along the cam slot 57 to cancel the gravity center.

Description

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

Conventional technology In recent years, with the spread of video tape recorders (hereinafter referred to as VTRs), there are more opportunities to use video cameras to take pictures, and it is now possible to perform stable camera work with less blurring without using a tripod. A video camera is required.

An example of the above-mentioned conventional photographing device will be described below with reference to the drawings. Conventionally, this type of photographing device has a fourth type, as shown in Japanese Patent Application Laid-Open No. 53-64175,
The structure was as shown in Figure 5. FIG. 4 is a front view of a conventional photographing device, and FIG. 5 is a side view. In FIGS. 4 and 5, there is a rotor case l that houses a rotor that rotates at high speed in the center as a directional gyro, and this is supported by a horizontal gimbal 3 with left and right horizontal axes 2. , is supported by a vertical gimbal 5 by 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, in the above configuration, since a gyro that rotates at a stationary speed is used, the device W becomes large and the weight increases, so normally the entire device must be installed and used. In addition to the problem of lack of mobility, if you are shooting hand-held and there is no need to prevent image blur, you can stop the image blur prevention means such as a gyro, but it is not necessary to stop it. As a result, the gyro effect disappears, and the stability of the horizontal gimbal 3.7 and vertical gimbal 5.8 is lost, and the video camera becomes unstable. Furthermore, since the center of gravity of the photographing device changes due to zooming, there is a problem in that it is difficult to determine the photographing direction.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a photographing lens group including a zoom lens and a zoom lens for changing the magnification of an optical image of a subject;
A lens barrel for housing a photographic lens group, a photoelectric conversion means for converting an optical image from the photographic lens group into an electrical signal, and a holding means for holding the lens barrel and the photoelectric conversion means so that their optical axes are aligned. , a rotational support means that supports the holding means so as to be rotatable in the panning direction (or pitching direction) about the center of gravity of the lens barrel, the photoelectric conversion means, and the holding means; The center of gravity correcting means prevents the position of the center of gravity from changing.

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, since the center of gravity of the lens barrel is corrected by moving the center of gravity of the lens barrel in conjunction with zooming in the opposite direction to the direction of movement of the center of gravity, the shooting direction can be stabilized.

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 partial sectional view of a lens barrel of a photographing device, FIG. 2 is a configuration diagram of the entire photographing device, and FIG. 3 is a sectional view taken along line XX in FIG. 2.

First, in FIG. 1, the focusing frame 11 includes a focusing lens 12.
．． 13 and 14 are inserted, and the focusing lenses 13 and 14
The distance between the surfaces is regulated by a lens spacer 15. The focusing lens 12°13.1'4 is fixed to the focusing frame 11 by a lens holding ring 16. Further, the focusing frame 11 includes a focusing gear frame 1 including a focusing ring gear 17a.
7 is locked. I set it in focus frame 11! 1. The coid screw 18 is a coid screw 20 provided in the fixed body 19.
It is screwed together. By rotating the focusing frame 11 or the focusing gear frame 17 around the optical axis, the helicoid screws 18, 20 repeat the focusing process in the optical axis direction. In addition, by pressing a focus operation button (not shown), the focus motor 21 rotates, and the focus motor 22, which is locked to the focus motor 21, moves through the idler gear 23, the friction bar 24, and the friction adjustment ring. The rotational force is transmitted to the friction mechanism consisting of 25, and the rotational force is transmitted to the focusing gear 17 via this friction mechanism and the focus shaft 26.
transmitted to b. When the rotational force is transmitted from the focusing gear 17b to the focusing ring gear 17a, the focusing frame 11, which engages with the focusing gear frame 17 and the focusing gear frame 17, rotates around the optical axis. The focusing lenses 12, 13, and 14 are extended in the optical axis direction. and focusing lens 12.13.14
Focusing gear frame 1 is used to regulate the amount of movement in the optical axis direction.
7 is provided with a notch 27 for regulating the amount of feedout, and a stopper 28 is provided in the fixed barrel 19 and comes into contact with the end of the notch 27.

The variable magnification lens 29, 30, 31 is attached to the first lens holding frame 3.
2, and the threaded portion 3 of the holding ring 33 of the variable magnification lens 29
4 is screwed into the threaded portion 35 of the first lens holding frame 32, so that the variable power lens 29°30.31 is fixed to the first lens holding frame 32. The correction lens 36 is inserted into the second lens holding frame 37 , and the holding ring 38 urges the correction lens 36 against the second lens holding frame 37 to fix it. Further, the first lens holding frame 32 and the second lens holding frame 37 are provided with holes 41 and 42 that fit into guide balls 40 fixed by the fixed barrel 19 and the ball support plate 39 in order to move in the optical axis direction. It moves in the optical axis direction using the guide ball 40 as a guide. The cam cylinder 43 is driven with the inner circumferential side of the fixed cylinder 19 and is connected to the first lens holding frame 32 and the second lens holding frame 32 .
It has a first cam s44 and a second cam groove 45 for moving the lens holding frame 37 in the optical axis direction, and its position is regulated by a ball support plate 39. The ball support plate 39 is
The pole support temporary holding screw 46 is screwed into the threaded portion 47 of the fixed barrel 19 to be fixed.

A first cam groove 44 provided with a cam cylinder 43 and a second cam 14
5 are screwed into a first lens holding frame 32 and a second lens holding frame 37 in order to regulate the positions of the variable magnification lens 29.30° 31 and the correction lens 36 on the optical axis, respectively. The first cam pin 48 and the second cam pin 49 are engaged with each other, and a pin 50 is implanted in the cam cylinder 43.

A zoom gear 52 is rotatably fitted into the zoom ring 51 for the optical axis, and a pin 50 is engaged with a long groove (not shown) formed on the inner circumferential side. When the zoom ring 51 rotates, the pin 50 engaged with the long groove (not shown) is driven and the cam cylinder 43 rotates, so that the position between the first lens holding frame 32 and the second lens holding frame 37 is Zooming is performed by regulating the positions of the variable power lenses 29, 30, 31 and the correction lens 36 by the first force groove 44 and the second cam groove 45. A zoom control lever 53 is fixed to the zoom ring 51, and when manually zooming, zooming is performed by rotating the zoom control lever 53 around the optical axis. In addition, when performing electric operation, a zoom motor (not shown) is rotated by pressing a zoom operation button (not shown), and rotational force is transmitted to the zoom gear 52 that engages with this zoom motor (not shown). zooming is performed.

Furthermore, the zoom ring 51 has a cam groove 57 for moving the weight 56 in conjunction with zooming so that the center of gravity of the lens barrel 55 does not change as the variable power lens group 54 and the correction lens 36 move. It is a provision. This weight 56 is ring-shaped, and is supported by the focus shaft 26 and a guide shaft 59 provided on the fixed plate 58, and is movable in the optical axis direction. In order to move the weight 56 through the third cam groove 57, a third guide pin 60 is screwed into the weight 56 and engaged with the third cam groove 57.

Next, the overall configuration of the photographing device will be explained with reference to FIGS. 2 and 3.

Fig. 2, Fig. 3, an arsenal shadow lens (fantastic lens 12.13.14, weird dual lens 29.
30.31, correction lens 36, fixed lens (not shown)
), a master lens (not shown), and an image sensor 71 such as a CCD provided on the focal plane of the photographic lens are held in the lens barrel 55. Furthermore, the electrical signal converted from the optical image by the image sensor 71 is converted into a predetermined video signal by the video circuit 72. Ball bearings 13.14 are press-fitted into the upper portion 55a and lower portion 55b of the lens barrel 55, respectively, and rotation wheels 76 are inserted from the top and bottom of the first frame 75, respectively.
．． 77 is rotatably fitted in ball bearings 73 and 74, and the lens barrel 55 is rotatable with respect to the first frame 75.

Further, a ring-shaped magnet 77 which is magnetized as required is fixed to the lower part 55b of the lens barrel 55 via a bank plate 76 made of an IF material. A stator winding 79 is fixed to the first frame 75 facing the magnet 77 and is bonded to a stator flat plate 18 made of a magnetic material.

In addition, in order to detect the rotational position of the lens barrel 55, a Hall element 7 is mounted on the stator flat plate 78 facing the magnet 77.
8a is provided. Ball bearings 79.80 are press-fitted into the left and right sides of the first frame 75, respectively, and rotating shafts 82, 83 are rotatably fitted into the ball bearings 79.80 from the left and right sides of the second frame 81, respectively. Ori lens barrel 5
5 and the first frame 75 are rotatable relative to the second frame 81. Furthermore, a ring-shaped magnet 85 that is magnetized as required is fixed to the right side of the first frame 75 via a back plate 84 made of a magnetic material. A stator winding 87 bonded to a stator flat plate 86 made of magnetic material 1↓ is fixed to the second frame 81 facing the magnet 85. Further, in order to detect the rotational position of the first frame 75 and the lens barrel 55 in the tilting direction, a Hall element 86a is provided on the stator flat plate 86 facing the mag 2 and the magnet 85. An angular velocity sensor 88 for detecting the angular velocity in the panning direction is fixed to the lens barrel 55, and the first frame 75 has the lens barrel! , 5 and the first frame 75 in the tilting direction. This angular velocity sensor 88.
The control circuit 90 controls the actuator 9, which includes a magnet 77, a stator winding 79, etc., to rotate the lens barrel 55 in the panning direction so that the output signal of the output signal 89 becomes zero.
1, and an actuator 92 consisting of a magnet 85 and a fixed element winding 87, which rotate the lens barrel 55 and first frame 75 in the tilting direction.

In addition, when locking the lens barrel 55, the female screw 93
A lock shaft is provided on the exterior 95 with a support member 94 having a male thread 96 that engages with the female thread 93, and whose end in the direction facing the lens barrel 55 has a spherical shape. By rotating the lock shaft 97 in the clockwise direction, the lock shaft 97 moves in the optical axis direction (arrow H direction) using the female thread 93 and the male thread 96 as guides, and locks the conical shaft 97 provided at the rear of the lens barrel 55. The lens barrel 55 comes into contact with the recess 98
To speak; Also, by rotating the lock shaft 97 in the left-hand thread direction, the lock shaft 97 moves in the optical axis direction (opposite direction of arrow H) using the female thread 93 and male thread 96 as guides, and is attached to the rear of the lens barrel 55. It separates from the provided conical recess 98, and the lens barrel 55 becomes unlocked.
Image blur is prevented.

Further, the lock shaft 97 is provided with a switch pressing portion 99, and this switch pressing portion 99 automatically turns on and off the switch 100 fixed to the support member 94 as the lock shaft 97 moves. , actuator 9
1.92 to automatically control the power supply.

Regarding the vortex imaging system configured as described above, the following is the 11th section.
The operation will be explained using FIGS. 2 and 3.

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 angular velocity sensor 88 (panning direction) detects the shaking of the lens barrel 55 caused by this video camera.
, 89 (tilting direction) detected by this angular velocity sensor 8 days.

By controlling the control circuit 90 by supplying power to the stator windings 79° 86 of the actuators 91 and 92 so that the output from the actuators 89 becomes zero, the shaking of the lens barrel 55 with respect to the absolute coordinates is eliminated. For example, if the lens barrel 55 shakes in the tilting direction (in the direction of arrow 1 in FIG. 3), the angular velocity sensor 89 detects the shaking in the tilting direction. The control circuit 90 supplies power to the stator 1vA87 of the active hand unit 92 so that the output is zero, and controls the drive in the direction opposite to the direction of the arrow (■), thereby preventing image blur in the tilting direction. I can do it. Image blur can be similarly prevented in the panning direction.

In addition, if image blur in the diagonal direction occurs, the angular velocity sensor 88 (panning direction), the angular velocity sensor 89. The control circuit 90 detects the amount of shaking (angular velocity) according to the tilting direction and controls the actuator 91.9 so that the output from the angular velocity sensors 88.89 in both directions becomes zero.
By supplying power to the stator windings 79 and 87 of No. 2, it is possible to prevent image blurring in the diagonal direction.

When carrying the camera or turning off the image stabilization effect,
By rotating the shaft 97 in the right direction, the female thread 93. Using the screw 96 as a guide, the lock shaft 97 moves in the optical axis direction (in the direction of arrow H) and comes into contact with four conical parts 98 provided at the rear of the lens barrel 55 to lock the lens barrel 55. A switch pressing portion 99 provided on the lock shaft 97 turns on the switch 100 to cut off power supply to the actuator units 91 and 92, thereby reducing power consumption.

In addition, by rotating the lock shaft 97 in the left direction, the lock shaft 97 can be rotated using the female screw 93 and the male screw 96 as guides.
moves in the optical axis direction (opposite direction of arrow H) and separates from the four conical parts 98 provided at the rear of the Shins lens barrel 55,
The lens barrel 55 is unlocked. At this time, lock shaft 9
The switch pressing part 98 provided at 7 turns the switch 100 OFF.
By setting it to F, power is supplied to the actuators 91 and 92, and the image blur is prevented.

When zooming is performed when the image blur prevention effect is ON, pressing the zoom operation button (not shown) rotates the zoom motor (not shown) and moves the lens barrel 55.
The zoom gear 52 is rotated to move the first lens holding frame 32 and the second lens holding frame 37 in the optical axis direction via the zoom ring 51 and the cam cylinder 43 to perform zooming.

At this time, the center of gravity of the lens barrel 55 moves as the first lens holding frame 32 and the second lens holding frame 37 move. In order to prevent this, the focus axis 26 and the guide axis 59
and a third lens provided on the zoom ring 51.
By rotating the zoom ring 51, the ring-shaped weight 56 having the third cam pin 60 engaged with the cam groove 57 moves along the third cam groove 57 opposite to the direction in which the center of gravity of the third cam pin 60 moves. direction, and the weight 56 also moves accordingly. Further, the third cam groove 57 provided in the zoom ring 51 has a cam shape that cancels the change in the center of gravity of the lens barrel 55 due to the movement of the first lens holding frame 32 and the second lens holding frame 37. This cam shape is obtained from the movement data of the variable power lens group 54 and the correction lens 36.

When the image blur prevention effect is OFF, zooming is performed by manually rotating the zoom operation lever 53 provided on the zoom ring 51, or electrically zooming is performed by pressing a zoom operation button (not shown). .

When focusing, when the image stabilization effect is ON, pressing the focus operation button (not shown) rotates the focus motor 21 to move the focus motor 21 provided on the focus gear frame 17 of the lens barrel 55. By driving the focusing ring gear 17a, the focusing frame II rotates, and the focusing lens moves in the optical axis direction to focus. Furthermore, when the image blur prevention effect is OFF, focusing is achieved by rotating the focusing frame 11 by hand. Alternatively, focusing is performed electrically by pressing a focus operation button (not shown).

In this embodiment, a weight is used to prevent the center of gravity from changing during zooming, but it may be corrected electrically. Alternatively, the rotational support position may be moved along with the movement of the center of gravity. Further, in this embodiment, the change in the center of gravity position is corrected only during zooming, but correction can also be made using a weight during focusing as in the case of zooming. Furthermore, although the focus axis is commonly used as a guide axis for the weight, a separate guide axis may be provided for the weight.

Effects of the Invention As described above, the present invention includes a photographic lens group including a zoom lens that changes the magnification of an optical image of a subject, a lens barrel that houses the photographic lens group, and a system that converts the optical image from the photographic lens group into an electrical signal. A photoelectric conversion means for converting, a holding means for holding the lens barrel and the photoelectric conversion means so that the optical axes are aligned, and a rotation center approximately at the center of gravity of the lens barrel, the photoelectric conversion means, and the holding means. The entire photographing device is composed of a rotation support means that supports the holding means so as to be rotatable in the panning direction (or pitching direction), and a center of gravity correction means that prevents the center of gravity position from changing even if the zoom lens moves. The camera is small and lightweight, allowing for hand-held shooting.

In addition, by moving the weight in conjunction with zooming, changes in the center of gravity of the lens barrel due to zooming are prevented, allowing stable shooting even when zooming. Furthermore, since one of the guide shafts of the weight is shared with the focus shaft, the number of parts can be reduced.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of the lens mirror paulownia portion of a photographing device according to an embodiment of the present invention, and FIG. 2 is a photographing! FIG. 3 is a sectional view taken along the line XX in FIG. 2, FIG. 4 is a front view of a conventional photographing device, and FIG. 5 is a side view of the conventional photographing device. 26... Focus axis, 51... Zoom ring, 55... Lens barrel, 5G...
... Weight, 51 ... Third cam groove, 60 ...
...Third cam pin, 71...CCD, 75.
......First frame, 81...Second frame 188.89...Angular velocity sensor, 90
...Control circuit, 91.92. ...actuator. Name of agent: Patent attorney Toshio Nakao Figure 3 Z Figure 4 q 3 to Figure 5

Claims (1)

[Claims] A photographic lens group including a zoom lens that magnifies an optical image of a subject, a lens barrel that houses the photographic lens group, a photoelectric conversion means that converts an optical image from the photographic lens group into an electrical signal, and the lens. holding means for holding the mirror and the photoelectric conversion means so that their optical axes coincide; and panning of the holding means around approximately the center of gravity of the lens barrel, the photoelectric conversion means, and the holding means. A photographing device comprising a rotary support means that supports the zoom lens rotatably in a direction (or a pitching direction), and a center of gravity correction means that prevents a center of gravity position from changing even if the zoom lens moves.