JP2000059661A - Television camera apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe television camera apparatus capable of interrupting the light outputted to an optical combination cable and turning off an AC power source as well when the interruption of light reception is judged concerning the television camera apparatus for transmitting data and power while using the optical combination cable between a camera control unit and a television camera head. SOLUTION: Concerning the television camera apparatus having a camera control unit 130, a camera head 100 and an optical combination cable 2, a control circuit 7 for detecting and controlling the state of optical transmission when operating, an electric/optic(E/O) converting circuit 1 for interrupting light output from the output of the control circuit 7 and a CPU 114 for controlling the ON/OFF of power supply to the optical combination cable are provided in the camera control unit 130.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a circuit for protecting a power supply of a television camera device from electric shock.

[0002]

2. Description of the Related Art The prior art is disclosed in Japanese Patent Application No. 9-240.
No. 959, the television camera device having the configuration shown in FIG. 2 includes a triax cable (triaxial cable) for connecting a camera head and a camera control unit.
In order to confirm whether or not the camera head is connected to the camera head, there is a camera control unit which detects the value by detecting a current value flowing through the terminal of the above-described cable connection connector. Furthermore, this television camera device has a device for switching on / off the power supplied to the triax cable when it is confirmed that the cable is not connected.

[0003]

In contrast to the above-mentioned one using a triax cable, when an optical composite cable is used, when the optical composite cable is pulled out from the camera head side, the camera is closed. The signal light from the control unit remains output, and the connector through which a larger current flows is exposed. Therefore, those become a serious problem concerning the safety of the operator.

For example, the present invention detects the presence or absence of an optical signal when an optical composite cable is pulled out, and if no signal light from the camera head is detected, the light from the camera control unit or from the camera head is detected. It is an object of the present invention to provide a safe television camera device capable of interrupting the output of the optical composite cable and further turning off the power supplied to the optical composite cable.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a circuit for optical / electrical conversion (O / E) in a camera control unit for detecting a light transmission state during standby. And control means for cutting off the optical output of the electric / optical conversion (E / O) circuit from the detected signal and for turning off the power supply to the optical composite cable.

[0006]

FIG. 1 is a block diagram showing an embodiment of a television camera apparatus according to the present invention. Hereinafter, the operation of the television camera device according to the present invention in the standby mode will be described in detail with reference to FIG.

In FIG. 1, 101-104, 107-
Reference numeral 128 is the same as that shown in FIG. 2 described in Japanese Patent Application No. 9-240959. Hereinafter, in the present embodiment, a description will be given of a transition of the operation from the normal operation before the optical transmission is interrupted by the television camera device to the operation when it is determined that the optical transmission is interrupted.

In FIG. 1, the CCU 130 operates normally in a standby mode. At that time, a small current is sent to the television camera head 100, and the O / E circuit 3, the control circuit 4, and the E / O circuit 5 operate. . If the optical composite cable 2 is normally connected to the television camera head 100, the power supply current flows normally, and the O / E circuit 3, the control circuit 4, and the E / O circuit 5 of the television camera head 100 Operated by power supply.

On the camera control unit 130 side,
The signal from the digital signal transmission processing 111 is converted into an electric signal by the E / O circuit 1 into an optical signal, and the converted optical signal is output. The optical signal is sent through the optical composite cable 2 to the O / E circuit 3 on the television camera head 100 side. The O / E circuit 3 converts the input optical signal into an electric signal, and converts the electric signal into a digital signal transmission process 1.
Send to 10. The O / E circuit 3 detects the light reception level and outputs the presence or absence of an optical signal as an electric signal. In a normal operation, an electric signal with an optical signal is sent to the control circuit 4.

The control circuit 4 receives a signal from the O / E circuit 3 and sends a signal for operating the E / O circuit 5. The E / O circuit 5 converts the electric signal from the digital signal transmission processing 110 into an optical signal, and sends the optical signal to the O / E circuit 6 of the camera control unit 130 through the optical composite cable 2. The O / E circuit 6 converts the optical signal into an electric signal and sends the electric signal to the digital signal transmission processing 111. The O / E circuit 6 detects the light reception level and outputs the presence or absence of an optical signal as an electric signal, and sends an electric signal with an optical signal to the control circuit 7 in a normal operation.

The control circuit 7 receives a signal from the O / E circuit 6 and sends a signal for operating the E / O circuit 1. A signal from the control circuit 7 is sent to the open detection circuit 116, which determines that the optical composite cable 2 is connected to the television camera head 100, and when the operation mode is set, the television camera head 10
0 is always supplied with a large current.

Next, it is assumed that the optical composite cable 2 has shifted from the above-described normal state to a state where the optical composite cable 2 is not connected to the television camera head 100. Here, it is assumed that the optical composite cable 2 is open. At this time, since no current is supplied to the television camera head 100, only the operation of the camera control unit 130 is performed.

On the camera control unit 130 side,
The signal from the digital signal transmission processing 111 is converted into an electric signal by the E / O circuit 1 into an optical signal, and the optical signal is output. Since the optical composite cable 2 is open, the optical composite cable 2 keeps outputting light, and the current further flows. The O / E circuit 6 detects the light reception level and outputs the presence or absence of an optical signal as an electric signal. In this case, since the optical signal is interrupted, the electric signal without the optical signal is sent to the control circuit 7. The control circuit 7 receives a signal from the O / E circuit 6,
A signal for cutting off the optical signal output of the E / O circuit 1 is sent. E
The / O circuit 1 receives this signal and stops outputting the optical signal.

A signal from the control circuit 7 is sent to an open detection circuit 116, and the open detection circuit 11
6, the optical composite cable 2 is a television camera head 1
It is determined that it is not connected to 00, so that a large current cannot be supplied to the television camera head 100.

[0015]

As described above, according to the present invention, in a television camera apparatus for transmitting data and power using an optical composite cable between a camera control unit and a television camera head, the light reception level is reduced. The optical output and power on / off are controlled using the detected values, so that even if the optical composite cable is pulled out, the light output to the optical composite cable is cut off. In addition, a protection circuit that cuts off the AC power can be realized, and a safer television camera device can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a block configuration of an embodiment of a television camera device of the present invention.

FIG. 2 is a diagram showing an example of a block configuration of a conventional television camera device.

[Explanation of symbols]

1: Electric / optical conversion circuit (E / O circuit) 2: Optical composite cable 3: Optical / electric conversion circuit (O / E circuit)
4: Control circuit, 5: Electric / optical conversion circuit (E / O circuit), 6: Optical / electric conversion circuit (O / E circuit), 7:
Control circuit, 100: camera head, 130: camera control unit (CCU), 131: triaxial cable, 101: AC input outlet,
102: AC input switch, 103: standby power supply circuit, 104: camera power switch, 105, 10
6: signal: power supply transmission processing circuit, 107: camera head internal power supply, 108: system information GEN, 109: system information transmission circuit, 110, 111: digital signal transmission processing circuit, 112: system information reception circuit,
113: standby / operating CTLGEN, 11
4: Central processing unit (CPU),
115: Operate gate circuit, 116: Cable open detection circuit, 117: Operate power supply circuit, 1
18: current transformer, 119: rectifier circuit, 12
0: comparator, 121: signal generation circuit, 12
2: signal receiving circuit, 123: zoom lens, 12
4: solid-state image sensor 125: preamplifier 126:
Camera head signal processing circuit, 127: signal receiving circuit in CCU, 128: comparator.

Claims (2)

[Claims] 1. A television camera device comprising a camera head, a camera control unit for controlling the camera head, and an optical composite cable for connecting the camera head and the camera control unit. Detecting means for detecting a light level in a standby mode of the John camera device, determining means for outputting a light ON / OFF signal according to the detected light level, and the optical composite cable according to the light ON / OFF signal A television camera device comprising a control unit for switching ON / OFF of a power supply supplied to a television. 2. The television camera device according to claim 1, further comprising control means for controlling ON / OFF of the light output instead of the control means for controlling ON / OFF of the power supply. Television camera device.