JPS6125144B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating stand for a television camera that rotates a television camera using a zoom lens vertically or horizontally.

Conventionally, the rotation speed of a rotary table mounted with a television camera that rotates vertically or horizontally by remote control is constant. This method has the disadvantage that the image while the camera is rotating cannot be accurately observed with the human eye.

The present invention has been made in view of the above points, and by changing the rotation speed of the television camera according to the zoom ratio of the zoom lens, the movement speed of the subject image on the monitor screen caused by the rotation of the television camera can be adjusted. To provide a rotating stand for a television camera which has a substantially constant zoom ratio regardless of the zoom ratio.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention in which an electric zoom lens has zoom ratio detection means. In the figure, 1 is an electric zoom lens;
2 is a zoom motor, 3 is a position detection circuit such as a potentiometer that works with the motor 2, 4 is a rotary table, 5 is a motor for vertical movement, 6 is a motor for left and right rotation, and 7 is a television camera using the rotary table 4 ( 8 is a motor speed control circuit that controls the rotational speed of the motors 5 and 6; 9 is an operating device; 10 is a zoom lens 1; A zoom operation switch 11 is a rotary table operation switch that selectively rotates the motors 5 and 6 of the rotary table 4 to change the pointing direction of the television camera.

In the above configuration, when the zoom operation switch 10 of the operation device 9 is operated, the zoom motor 2 of the zoom lens 1 is driven, and the zoom ratio is changed. When the motor 2 operates, its rotational position is determined by the position detection circuit 3.
Detected by Since the rotational position of the motor 2 detected by the position detection circuit 3 is associated with the zoom ratio in advance, the position detection signal from the position detection circuit 3 is used as information indicating the zoom ratio to control the motor speed of the interlocking control unit 7. It is applied to circuit 8. When the rotary table operation switch 11 of the operating device 9 is operated in this state, the vertical movement motor 5 or the left and right rotation motor 6 operates at a speed controlled by the motor speed control rotation 8 to rotate the television camera in the desired direction. let

It is also possible to operate the zoom operation switch 10 while operating the rotary table operation switch 11,
In either case, the motor speed control circuit 8 slows down the rotational speed of the motors 5 and 6 when the zoom ratio is large (telephoto), and conversely when the zoom ratio is small (wide-angle).
Then, speed control is performed to increase the rotational speed of the motors 5 and 6.

FIG. 2 is a block diagram showing another embodiment of the present invention in which the zoom lens does not have a position detection function.
The same parts as in FIG. 1 are given the same reference numerals. Although the electric zoom lens 1 of this embodiment can change the zoom ratio by remote control using the zoom motor 2, the zoom ratio information cannot be taken out to the outside. Therefore, the interlocking control section 7 has a motor 12 controlled by the zoom operation switch 10.
and a position detection circuit 13 interlocked with this motor 12.
has been established. The motor 12 operates in the same manner as the zoom motor 2, and its rotational position is detected by a position detection circuit 13.

With the above configuration, even if the zoom lens 1 does not have a position detection function, the position detection circuit 13 can be connected to the motor 12.
Since the rotational position of the zoom motor 2 can be indirectly detected from the rotational position of the zoom motor 2, the position detection signal of the position detection circuit 13 can be given to the motor speed control circuit 8 as information indicating the zoom ratio. Therefore, in the television camera turntable of this embodiment as well, the rotation speed of the television camera can be changed in accordance with the zoom ratio as in the previous embodiment.

Note that the rotation speed of the television camera by the rotary table 4 may be changed continuously or in steps.

As described above, the television camera rotary table of the present invention changes the rotation speed of the television camera according to the zoom ratio of the zoom lens, so the moving speed of the subject image on the monitor screen caused by the rotation of the television camera is It is approximately constant regardless of the zoom ratio, and when wide-angle, it is possible to observe the desired area at a faster speed than conventional fixed rotation speed, and when telephoto, it is possible to obtain a monitor image that changes easily enough to be tracked by the human eye. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a block diagram showing another embodiment of the invention. 1...Electric zoom lens, 2...Zoom motor,
3, 13...Position detection circuit, 4...Turnable table, 5...Motor for vertical movement, 6...Motor for left and right rotation, 7...Interlocking control unit, 8...Motor speed control circuit, 9...Manufacturer,
10...Zoom operation switch, 11...Rotary table operation switch, 12...Motor.

Claims (1)

[Claims] 1 means for rotating the television camera, means for detecting the zoom ratio of a zoom lens provided on the television camera, and a rotating speed of the television camera that is slow when telephoto and slow when wide-angle, depending on the zoom ratio detected by the means; 1. A rotary stand for a television camera, characterized in that it is equipped with a turning speed control means that performs variable control to increase the speed of movement of a subject image in an imaging screen to a substantially constant speed.