JP3332505B2 - TV lens device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television lens device used for a television camera in a broadcasting station or the like.

[0002]

2. Description of the Related Art FIG. 3 is a circuit diagram of a power supply system of a conventional television lens device. A television camera power supply 1 includes a video processing circuit 2, an iris servo control circuit 3, an extender servo control circuit 4, and a zoom servo control circuit. 5, a focus servo control circuit 6, an iris servo driver circuit 7, an extender servo driver circuit 8, a zoom servo driver circuit 9, and a focus servo driver circuit 10 are connected in parallel, and the TV camera power supply 1 supplies each power. It is configured. The command signal of the iris servo control circuit 3 is connected to an error signal detector 12 to which a position signal from a position sensor 11 for detecting the position of the lens is input, and the output of the error signal detector 12 is sent to an iris servo driver circuit 7. The iris servo driver circuit 7 drives the lens from the motor 13.

The same applies to the extender servo control circuit 4, the zoom servo control circuit 5, and the focus servo control circuit 6, and the command signals from the respective control circuits are input with the position signals from the position sensors 14, 15, and 16. Respectively connected to the error signal detectors 17, 18, 19,
The outputs of the error signal detectors 17, 18, and 19 are input to the extender servo driver circuit 8, the zoom servo driver circuit 9, and the focus servo driver circuit 10, respectively, and the motors 20, 21, and 22 drive the lenses, respectively. I have.

[0004]

However, in the above-mentioned conventional example, the current consumption inside the television lens greatly increases due to an increase in the zoom and focus driving torque due to the higher magnification and higher performance of the television lens device. The power supplied from the television camera alone causes power shortage, and noise is mixed in the video signal of the television camera because the power supply of the television camera is used in common with the television lens.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a television lens device that prevents power shortage from a television lens.

[0006]

According to the present invention, there is provided a television lens apparatus for performing zooming and focusing by a zoom servo and a focus servo, wherein a power supply is provided to the zoom servo and the focus servo. Auxiliary power supply means for supplying an error signal detecting means for detecting an error signal between a command signal from the focus servo and a position signal from a position sensor, a television camera based on the error signal, and Power supply switching determining means for determining which power supply of the auxiliary power supply means supplies power to the zoom servo and the focus servo; and power supply switching means for switching a power supply to be used based on an output of the power switching determining means. It is characterized by having.

[0007]

In the television lens device having the above-described structure, an error signal between a command signal for zoom servo and focus servo and a position signal from a position sensor is detected by an error signal detecting means. Whether power is supplied to the zoom servo and the focus servo is determined by the power supply switching determination unit, and the power supply to be supplied is switched by the power supply switching unit based on the result, whereby stable power supply to each device is performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is a circuit diagram of the embodiment, and FIG.
The same reference numerals indicate the same members. The difference from the conventional example is that the zoom servo driver circuit 9 and the focus servo driver circuit 10 are connected in parallel via a power switch 23 having terminals 23a and 23b. A zoom servo driver circuit 9 and a focus servo driver circuit 10 are connected in parallel to a television lens auxiliary power supply 24 via a power supply switch 23, and power is supplied from any power supply by switching the power supply switch 23. I can do it.

The error signals Se of the error signal detectors 18 and 19 are connected to a power switching judgment unit 25, and the output of the power switching judgment unit 25 is a TV lens for charging the power switching unit 23 and the TV lens auxiliary power supply 24. It is connected to the auxiliary power supply charging device 26. Further, a TV lens auxiliary power supply charge output detector 27 is connected to the TV lens auxiliary power supply 24,
The output of the TV lens auxiliary power supply charge output detector 27 is a power switch determination unit 25, a TV lens auxiliary power supply charge indicator 28
It is connected to the.

When the television lens is used, the error signal from the error signal detectors 18 and 19 is output from the power supply switching judgment unit 25.
When it is determined that Se is equal to or less than the rating, the terminal 23b of the power switch 23 is selected, and the television camera power supply 1 supplies power to all devices. If it is determined that the error signal Se exceeds the rating, the terminal 23a is selected, and the television lens auxiliary power supply 24 supplies power to the zoom servo driver circuit 9 and the focus servo driver circuit 10,
The TV camera power supply 1 supplies power to all other devices.

Next, when the TV lens auxiliary power supply charging output detector 27 determines that the TV lens auxiliary power supply 24 is not connected or is below the rating, the result is transmitted to the power supply switching judgment unit 25, and the power supply switching is performed. The terminal 23b of the power switch 23 is selected by the determiner 25, and the television camera power supply 1 supplies power to the zoom servo driver circuit 9 and the focus servo driver circuit 10. Further, when the TV lens auxiliary power supply 24 is below the rating, the TV lens auxiliary power supply charging device 26 charges the TV lens auxiliary power supply 24 from the TV camera power supply 1 and turns on the TV lens auxiliary power supply charging indicator 28.

In this way, when the current consumption inside the television lens increases, the television lens auxiliary power supply 24 supplies power to the zoom servo driver circuit 9 and the focus servo driver circuit 10 so that the television lens Insufficient power from the device can be prevented.

In FIG. 1, the switching of the power supply is determined by the error signal Se and the output of the TV lens auxiliary power supply 24. However, as shown in FIG. It can also be performed based on the current consumption of the servo driver circuit 9 and the focus servo driver circuit 10 and the output of the television lens auxiliary power supply 24.

[0014]

As described above, the television lens device according to the present invention is provided with a power supply switching judging device for judging the switching of the power supply of the zoom servo and the focus servo, so that the television camera at the time of zooming and focusing operation is provided. It is possible to stabilize the power supplied from the TV and prevent noise from being mixed into the video signal of the TV camera.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an embodiment.

FIG. 2 is a circuit diagram of another embodiment.

FIG. 3 is a circuit diagram of a conventional television lens device.

[Explanation of symbols]

 Reference Signs List 1 TV camera power supply 2 Video processing circuit 3 Iris servo control circuit 4 Extender servo control circuit 5 Zoom servo control circuit 6 Focus servo control circuit 7 Iris servo driver circuit 8 Extender servo driver circuit 9 Zoom servo driver circuit 10 Focus servo driver circuit 11, 14, 15, 16 Position sensor 12, 17, 18, 19 Error signal detector 13, 20, 21, 22 Motor 23 Power supply switch 24 TV lens auxiliary power supply 25 Power supply switch decision unit 26 TV lens auxiliary power supply charging device 27 TV lens Auxiliary power output detector 28 TV lens auxiliary power charging indicator 31 Current consumption detector

Claims (3)

(57) [Claims] 1. A television lens apparatus for performing zooming and focusing by a zoom servo and a focus servo, an auxiliary power supply unit for supplying power to the zoom servo and the focus servo, and command signals from the zoom servo and the focus servo. supplying the error signal detecting means for detecting an error signal, the power to the zoom servo and the focus servo from any power source of the television camera and the auxiliary power supply unit based on the error signal between the position signals from the position sensor and A television lens device comprising: a power supply switching determination unit for determining whether to perform power switching; and a power supply switching unit for switching a power supply to be used based on an output of the power supply switching determination unit. 2. The television lens device according to claim 1, further comprising an auxiliary power supply charging unit that charges the auxiliary power supply unit when the auxiliary power supply unit is in a disconnected state or below a rating. 3. The television lens device according to claim 1, further comprising means for detecting current consumption of the zoom servo and the focus servo, and switching between power supplies of the zoom servo and the focus servo based on a detection result.