JPH03109878A - Zoom lens driving device for television camera - Google Patents

Abstract

PURPOSE:To improve the operability at television zoom lens drive by using a selection switch means and a signal switching means so as to allow one potentiometer to apply focus drive and macro drive. CONSTITUTION:This device is provided with a selection switch means 18 selecting focus drive or macro drive, a potentiometer 12 generating a signal equivalent to focus position or macro position set externally, a signal switching means 11 outputting a signal generated in the potentiometer 12 to focus servo means 3-5 and outputting a signal of the 2nd signal generating means 10 to macro servo means 7-9 respectively when the focus drive is selected and outputting a signal generated in the potentiometer 12 to macro servo means 7-9 and outputting a signal of the 1st signal generating means 8 to focus servo means 3-5 respectively when the macro drive is selected are provided to the driver. Thus, one potentiometer 12 implements focus drive and macro drive to improve the operability.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to an improvement in a zoom lens driving device for a television camera that uses a servo motor to control the focus and macro functions of a zoom lens for a television camera. .

(Background of the Invention) Conventionally, as shown in FIG. 2, a focus demand 20 was provided as a focus control signal generating means, and a macro demand 21 was provided as a macro control signal generating means, each as separate and independent devices. . In addition, in Figure 2,
1 is a zoom lens for a television camera, 14 is a television camera section, 15 is a viewfinder, 16 is a tripod, 17 is a cameraman, 18 is a vanning lever, and 19 is a zoom demant.

In the above-mentioned conventional example, since the control signal generation means for focus servo and macro servo are provided separately, it is difficult for the cameraman 17 who operates the lens to decide whether to perform focus positioning or macro drive. Different demants had to be used depending on the case, which caused problems when the operation became complicated.

(Objective of the Invention) An object of the present invention is to provide a zoom lens driving device for a television camera that can solve the above-mentioned problems and improve operability when driving a zoom lens for a television.

(Features of the Invention) In order to achieve the above object, the present invention provides a selection switch means for performing focus drive or macro drive, and a signal that generates a signal corresponding to the focus position or macro position set from the outside. and a potentiometer that outputs a macro signal generated by the potentiometer, and when focus drive is selected by the selection switch means, a signal generated by the potentiometer is used as a focus signal to be sent to the focus search means, and a macro signal generated to the second signal generation means is sent to the macro servo means. If macro drive is selected, the signal generated in the potentiometer is output as a macro signal to the macro servo means, and the focus signal generated in the first signal generation means is output to the focus servo means. A signal switching means is provided, and one potentiometer (that is, one demand) is provided with a selection switch means and a signal switching means.
It is characterized by performing focus drive and macro drive.

(Example of the invention) FIG. 1 is a block diagram showing one embodiment of the present invention.

In Fig. 1, 1 is the zoom lens for the TV camera shown in Fig. 2, 2 is the focus & macro demand, 3 is the focus drive motor, 4 is the focus follow potentiometer, 5 is the focus servo amplifier, and 6 is the focus point Setting potentiometer, 7 a macro drive motor, 8 a macro follow potentiometer, 9 a macro servo amplifier, 10 a macro standard position setting potentiometer, 11 a control signal switching device, 12 a focus control potentiometer, 13 a macro 0N1
This is the 0FF switch.

In the above configuration, a procedure for using demand 2 as a macro demand will be explained.

First, macro 0N10FF switch 13 is set to 0FF (7)
At this time, the demand 2 operates as a focus control signal generating means. That is, the signal from the focus controller potentiometer 12 is input to the focus servo amplifier 5 through the control signal switching device 11 in the zoom lens 1 for a television camera.

The value of the focus follow potentiometer 4 is also input to the focus servo amplifier 5, and the focus drive motor 3 is driven in accordance with the command signal. When the signal from the focus controller potentiometer 12 and the signal from the focus follow potentiometer 4 match, the drive of the focus drive motor 3 is stopped.

At this time, during macro servo, the value of the macro standard position setting potentiometer 10 is input to the macro servo amplifier 9 by the control signal switching device 11, and the value of the macro follow potentiometer 8 is also input at the same time.
It is driven by a macro drive motor 7 to be at the macro standard position.

On the other hand, when the macro 0N10FF switch 13 is turned on, the control signal switching device 11 functions (the reverse state of the switch shown in FIG. 1), and the demand 2 functions as a macro control signal generating means, that is, a macro demand. .

That is, the signal from the focus control potentiometer 12 is input to the macro servo amplifier 9 through the control signal switching device 11 in the zoom lens 1 for a television camera.

The value of the macro follow potentiometer 8 is also input to the macro servo amplifier 9, and the macro drive motor 7 is driven according to the command signal. When the signal from the focus controller potentiometer 12 and the signal from the macro follow potentiometer 8 match, the drive of the focus drive motor 7 is stopped.

At this time, the control signal switching device 11 on the focus servo side
Since the value of the focus close setting potentiometer 6 is input to the focus servo amplifier 5 and the value of the focus follow potentiometer 4 is also input at the same time, the focus drive motor 3 is driven to bring the focus to the close position. There is.

According to this embodiment, by combining the focus demand and the macro demand into only one unit, the demand 2, it is possible to solve the problem of complicated operations when operating a zoom lens for a television camera.

(Correspondence between the invention and the embodiments) In this embodiment, the control signal switching device 11 corresponds to the signal switching means of the present invention, and the macro 0N10FF switch 13 corresponds to the selection switch means.

(Effects of the Invention) As described above, according to the present invention, there is provided a selection switch means for performing focus drive or macro drive, and a signal corresponding to the focus position or macro position set from the outside. When focus drive is selected by the selection switch means, a signal generated by the potentiometer is used as a focus signal to be sent to the focus servo side stage, and a macro signal generated to the second signal generation means is sent to the macro servo means. and when macro drive is selected, a signal is output to the macro servo means using the signal generated in the potentiometer as a macro signal, and a focus signal generated in the first signal generating means is output to the focus servo side. By providing a selection switch means and a signal switching means, one potentiometer can perform focus drive and macro drive, making it possible to improve operability when driving a TV zoom lens. .

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a diagram for explaining the operation of a conventional zoom lens for a television camera. 1...Zoom lens for TV camera, 2...
... Demant, 5 ... Focus servo amplifier, 9 ... Macro servo amplifier, 11 ...
... Control signal switching device, 12 ... Focus potentiometer, 13 ... Macro 0N10FF
Suitsuji.

Claims (1)

[Claims] (1) Focus servo means for performing focus drive based on an input focus signal; macro servo means for performing macro drive based on an input macro signal;
Focus driving is performed in a zoom lens driving device for a television camera, which includes a first signal generating means for generating a focus signal indicating a close position, and a second signal generating means for generating a macro signal indicating a macro standard position. a potentiometer for generating a signal corresponding to a focus position set from the outside or a macro position; and a potentiometer for generating a signal corresponding to an externally set focus position or a macro position; A signal generated in the potentiometer is outputted as a focus signal to the focus servo means, and a macro signal generated in the second signal generation means is outputted to the macro servo means, and when macro driving is selected, the potentiometer A zoom for a television camera, characterized in that signal switching means is provided for outputting a signal generated in the first signal generating means as a macro signal to the macro servo means, and outputting a focus signal generated in the first signal generating means to the focus servo means. Lens drive device.