JP2003110893A - Communication method and power supply method, and television camera using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a television camera that needs no power switching circuit or DC voltage conversion circuit in a camera head and is provided with a simplified compact power supply circuit, in a television camera in which a composite cable is used to transmit a data or a power supply signal between a CCU and a camera head. SOLUTION: A DC voltage is superimposed on an intercom circuit in standby mode in a CCU to isolate the DC voltage element from an intercom signal by using a power supply isolation circuit in a camera head, thereby operating an intercom circuit. The DC element is superimposed on an intercom return signal from the camera head, and it is sent to the CCU. A voltage of the DC element in the intercom return signal in standby mode is detected, and when the detected voltage exceeds a specified value, an AC power supply is supplied to the camera head to set to operate mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television camera device, and more particularly to a power supply method for separately using a camera head and a camera control unit.

[0002]

2. Description of the Related Art A conventional television camera device will be described with reference to FIG. FIG. 2 is a block diagram showing the outline of an example of the overall configuration of a television camera device in which a conventional camera head and a camera control unit (CCU) are separately used. In FIG. 2, 1 is a camera head part, 2 is a lens part, 3 is a main power circuit of the camera head part 1, 4 is a head intercom circuit (head INCOM circuit) of the camera head part 1, and 14 is a camera head part 1.
Input power switching circuit, 15 is the power supply voltage conversion circuit for the camera head 1, 6 is the camera control unit (C
CU), 7 is the power transformer of CCU 6, 8 is the power input terminal of CCU 6, 9 is the DC power circuit of CCU 6, and 10 is CCU 6
CCU intercom circuit (CCU INCOM circuit), 11 is C
CU 6 intercom return signal detection circuit (INCOM RET circuit), 12 is CCU 6 camera power switch, 13 is CC
This is the power switching circuit for U 6. 5 is a composite cable for exchanging data signals and power signals between the camera head unit 1 and the CCU 6.

In FIG. 2, light incident on the camera head section 1 is converted into a video signal via a lens section 2,
The original operation of the television camera and the internal configuration until transmission of the camera image to the CCU 6 via the composite cable 5 and output of the camera image are omitted. That is, the schematic configuration of the television camera device of FIG. 2 is a block configuration diagram showing only the portion related to the power supply function according to the present invention, and shows all the circuit configurations required for the television camera device. Not shown.

The operation modes of the power sources of the camera head unit 1 and the CCU 6 are of three modes: an off mode (camera power off state), a standby mode, and an operation mode (camera power on state). Conventionally, as shown in FIG. 2, the distance between the camera head 1 and the CCU 6 is 1
Book composite cable 5 (camera cables 5-1, 5-2, 5-
3), etc., and cables for transmitting video signals, control signals, etc. are omitted), and it is customary to transmit data signals and power supply signals via these cables. The composite cable 5 has a length of tens to hundreds of meters, and the camera head unit 1 and the CCU 6 are separated from each other. That is, at the shooting location, there is a camera head unit 1 and at least one cameraman for operating the camera head unit 1, and in a relay vehicle, relay station, studio, etc., a CCU 6
And there is at least one operator to operate the CCU 6.

The camera head unit 1 does not have a supply unit for independently supplying the power supply voltage, and the power is supplied from the CCU 6. From the CCU 6 to the camera head unit 1, for example, D
Supply power voltage of C 24V and AC 230V. In the television camera device of FIG. 2, the camera head unit 1 and the CCU 6
Is installed and the composite cable 5 is connected to the camera head 1 and C
Power is supplied from the CCU 6 to the camera head unit 1 by connecting it to the CU 6, but whether the composite cable 5 is connected to the operator of the CCU 6 on the power supply side at the camera head unit 1 I don't know if I'm away or not. Therefore, when supplying power to the camera head unit 1 from the off mode in which the camera power is off, the operator first sets the standby mode.

In the standby mode, only the intercom line operates between the camera head unit 1 and the CCU 6. In the off mode, the input power switching circuit 14 of the camera head unit 1 is set to couple the power supply voltage supplied from the CCU 6 via the cable 5-3 to the power supply voltage conversion circuit 15. In addition, the power supply switching circuit 13 of the CCU 6 has the output of the DC power supply circuit 9
It is in a state of being combined with. That is, the operator
When the DC power supply circuit 9 of the CU 6 is started up and put into standby mode, the DC power supply circuit 9 is connected to the DC voltage (for example, 2
4 V), and the camera head through the cable 5-3
Output to the input power supply switching circuit 14 of 1. The input power supply switching circuit 14 outputs the input DC voltage to the input power supply conversion circuit 15, and the input power supply conversion circuit 15 generates a power supply voltage for operating the head intercom circuit 4 from the supplied power supply voltage. Supply to the head intercom circuit 4. The DC power supply circuit 9 may be a dry battery or a charger that has been charged in advance.

The head intercom circuit 4 is provided in the CCU 6.
Connect the CCU intercom circuit 10 with the composite cable 5 (camera head 1 to CCU 6 is connected with the camera cable 5-2, and CCU 6 is connected with the camera head 1 with the camera cable 5-1). , Establish a call line that allows the photographer and the operator to talk to each other. Also CC
At U 6, the camera cable 5-2 is connected to the CCU intercom circuit 10 and also to the intercom return signal detection circuit 11.

When the communication line is connected, the CCU intercom circuit 10 sends a connection confirmation signal to the head intercom circuit 4 via the cable 5-1 and the head intercom circuit 4 receives the signal. Then, this time, the return signal is sent to the intercom return signal detection circuit 11 via the cable 5-2 (or when the communication line is connected,
The head intercom circuit 4 automatically sends the return signal via the cable 5-2 to the intercom return signal detection circuit 11
Return signal to)). Intercom return signal detection circuit
11 、 Camera power switch when detecting the return signal
Output the signal (INCOM OK signal) to 12. When the camera power switch 12 receives the INCOM OK signal, it controls the power switching circuit 13, and the cable 5-3 and the DC power circuit.
Switch the connection with 9 to the connection between cable 5-3 and power input terminal 8. The intercom return signal detection circuit 11
If no return signal is detected, the camera power switch 12
The INCOM OK signal is not output to. Therefore, the camera power switch 12 is in a state where the cable 5-3 and the DC power supply circuit 9 are still connected.

As described above, after setting the standby mode, the operator connects the power input terminal 8 to the power supply source to set the operation mode. Power input terminal 8
A predetermined power supply voltage is input from and is supplied to the power transformer 7. The power transformer 7 converts the supplied predetermined power supply voltage into a predetermined AC voltage, for example, AC 230 V,
Output to power supply switching circuit 13. This makes AC
The voltage is supplied to the input power switching circuit 14 of the camera head unit 1 via the cable 5-3. The input power supply switching circuit 14 checks the input power supply voltage, and if the power supply voltage is less than the specified value, supplies the power supply voltage supplied via the cable 5-3 to the power supply voltage conversion circuit 15, and if it is not less than the specified value. If so, the input power supply voltage is switched and supplied so that the power supply voltage supplied via the cable 5-3 is supplied to the main power supply circuit 3. In this way, when a voltage of 230 V AC is applied to the main power supply circuit 3,
The main power supply circuit 3 creates a necessary voltage for the entire camera head unit 1 and supplies it to each necessary component. The head intercom circuit 4 also operates by the voltage supplied from the main power supply circuit 3. In addition, when the camera operator operates the head intercom circuit 4 in the off mode state to activate a call line that enables the camera operator and the operator to talk with each other, the preparation power supply ( It can be executed by activating the head intercom circuit 4 by operating the head intercom circuit 4 (not shown).

[0010]

In the above-mentioned prior art,
In standby mode, DC2 from the CCU to the camera head
It supplies a power supply voltage of 4 V and 230 V AC in the operation mode. Therefore, on the camera head side, there is a switching circuit for switching between two low-voltage DC voltages, for example, DC 24 V and high-voltage AC voltage, for example, AC 230 V, and an intercom circuit during standby. There is a drawback that a power supply voltage conversion circuit for operating the camera is required and the power supply circuit system of the camera head is complicated. Also, when the camera operator who operates the camera head wants to turn off the power of the camera head, the operator on the CCU side should be contacted with an intercom and the power supplied to the camera head from the CCU side should be contacted. You have to drop it. However, because of the urgency at the shooting site, the photographer
When I wanted to turn off the power quickly, I had to disconnect the composite cable from the camera head. And in that case,
The camera power switch of the CCU was not reset, and the high voltage AC power supply voltage was still being supplied from the power supply switching circuit to the composite cable, which was a very dangerous condition. Even if the AC power supply is stopped on the CCU side as well, when the power is supplied again, the camera power switch of the CCU is not reset, so there is a drawback that a high AC power supply voltage is also supplied. SUMMARY OF THE INVENTION It is an object of the present invention to provide a television camera device which eliminates the above-mentioned drawbacks, simplifies the power supply circuit of the camera head section, and downsizes the configuration of the camera head section. A second object of the present invention is to reliably detect on the CCU side whether or not the camera head side and the composite cable are connected, and if they are not connected, supply a high voltage AC power supply voltage to the composite cable. It is to provide a safe and reliable television camera device that is not operated.

[0011]

In order to achieve the above object, the television camera device of the present invention has a power supply switching circuit in the camera head section by superimposing a DC voltage on a CCU intercom line in a standby mode. This is a simplified power supply circuit without a power supply voltage conversion circuit. That is, in the television camera device of the present invention, the DC voltage is superimposed on the intercom line in the standby mode of the television camera device in the power source separating means for separating the DC power source from the intercom signal in the camera head part and the camera control unit. Superimposing means for detecting and a detecting means for detecting a return signal of the intercom signal,
A control means is provided for switching on and off the power supplied to the camera cable according to the detected value.

Further, the communication method of the television camera device according to the present invention is the television camera device for transmitting an intercom signal such as a data signal or a power source signal between the camera control unit and the camera head section by using a composite cable. A DC voltage of a predetermined voltage is superimposed on the intercom signal, and the intercom signal in which the DC voltage is superimposed is transmitted.

Further, the power supply method of the present invention is a television camera apparatus for transmitting an intercom signal such as a data or power signal by an intercom circuit between a camera control unit and a camera head section using a composite cable, A DC voltage of a predetermined voltage is superimposed on the intercom signal transmitted from the camera control unit to the camera head unit, and the camera head unit determines the DC voltage from the intercom signal on which the received DC voltage is superimposed.
A voltage is extracted, and the intercom circuit of the camera head unit is operated by the extracted DC voltage.

Further, the television camera device of the present invention uses a composite cable to transmit an intercom signal such as a data signal or a power supply signal between the camera control unit and the camera head section by an intercom circuit, and the intercom signal is transmitted from the camera control unit. In the television camera device that supplies power to the camera head unit, the intercom circuit of the camera control unit includes an intercom circuit that superimposes a DC voltage of a predetermined voltage on an intercom signal transmitted from the camera control unit. The camera head unit includes an intercom circuit for separating a DC voltage and an intercom signal from an intercom signal obtained by superimposing the received DC voltage, and the intercom signal of the camera head unit is separated by the separated DC voltage. Operate the cam circuit Than it is.

Further, the intercom circuit of the camera control unit comprises an intercom circuit for superimposing a DC voltage of a predetermined voltage on an intercom signal transmitted from the camera control unit, and the camera head section receives the received signal. A power supply separation circuit for separating the DC voltage and the intercom signal from the intercom signal on which the DC voltage is superimposed is provided, and the intercom circuit of the camera head section is operated by the separated DC voltage. Furthermore, the intercom circuit of the camera head unit is an intercom circuit that superimposes a DC voltage on the intercom signal to be transmitted and transmits the intercom signal as a return signal of the intercom signal. Furthermore, the camera control unit controls the on / off of the power supply for supplying to the camera head unit in accordance with the detection means for detecting the return signal of the intercom signal and the detected value. It is provided with a control means. Furthermore, the detection means detects a DC voltage component of the return signal, compares the detected DC voltage component with a predetermined reference value, and compares the DC voltage component with the predetermined reference value. In the case of a large size, it is provided with a switching device which is coupled so as to supply the power to the camera head part.

From the above, the television camera device of the present invention uses an audio transformer to apply the DC voltage to the intercom signal as a superimposing means for superimposing the DC voltage on the intercom line in the standby mode of the television camera device. Superimpose. The intercom signal sent to the camera head is separated from the DC power supply voltage by a series regulator as a power supply separation means. As a detection means for detecting the return signal of the intercom signal, a comparator having a reference voltage value that is set sufficiently lower than the DC voltage of the return signal of the intercom signal is used to compare the return signal with the reference voltage value. To do. As a result of comparison, for example, when the DC voltage of the return signal is lower than the reference voltage value, the LOW level signal indicating that the intercom signal is not coming because the camera cable is not connected or the camera cable is broken, is output. On the other hand, when a normal intercom return signal is received, a high level signal is output. Based on this signal, the power supply to the camera head as a camera power ON / OFF control signal (INCOM OK signal) is controlled to be turned on or off.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram for explaining an embodiment of the present invention, and is a block diagram showing an outline of an overall configuration example of a television camera device in which a camera head section and a CCU are separately used. In FIG. 1, components denoted by the same reference numerals as those in FIG. 2 are almost the same as those in the prior art shown in FIG. 2, and therefore detailed description thereof will be omitted. In the present embodiment, the intercom in the standby mode is used. The operation of the line will be described. The intercom line is a line that is normally used by a camera operator who operates the camera head 1'and an operator who makes adjustments, etc. on the CCU 6'side when using the headphone / microphone to talk on the phone. so,
Audio signals are transmitted between the camera head 1'and CCU 6 '.

In addition, the intercom line is also supplied with a high power supply voltage of, for example, AC 230 V to the camera head 1'through the composite cable 5 in the operating mode, so that the composite cable 5 is connected to the camera head. If it is not connected to part 1 ', CCU 6'
It is also used to obtain judgment information for turning off or turning on the power supply switching circuit 13 'so that 230 V AC, for example, is not output to the composite cable 5 from.

First, on the CCU 6'side, the audio signal is C
The CU intercom circuit 10 becomes the intercom signal of the AC component. In FIG. 1, means for inputting a voice signal to the CCU intercom circuit 10 and the CCU intercom circuit 10
The means for outputting the audio signal from is omitted. Similarly,
The means for inputting a voice signal to the head intercom circuit 4'and the means for outputting a voice signal from the head intercom circuit 4'are omitted. The DC power supply circuit 9 generates a predetermined DC voltage and outputs it to the CCU intercom circuit 10. The CCU intercom circuit 10 receives the input D
Superimpose the C voltage on the intercom signal, and
It is output via -1 to the power supply separation circuit 16 of the camera head 1 '. Power supply separation circuit for camera head 1'16
Separates the intercom signal on which the DC voltage is superimposed into a DC voltage component and an AC component. The separated DC voltage component is used as the power supply voltage for the intercom circuit 4'of the camera head section 1 ', and the separated AC component (intercom signal) is converted into sound in the intercom circuit 4'and is converted by the cameraman. Be transmitted to. In the configuration of FIG. 1, the DC voltage-superimposed intercom signal transmitted from the CCU 6 ′ is given to the power supply separation circuit 16 and separated into the DC voltage component and the intercom signal, and then the intercom circuit 4 ’Is given. However, the DC voltage-superimposed intercom signal transmitted from the CCU 6 ′ is given to both the power supply separation circuit 16 and the intercom circuit 4 ′,
The intercom circuit 4'may extract only the intercom signal component from the intercom signal on which the DC voltage is directly applied and convert the voice.

On the other hand, the audio signal transmitted by the cameraman is
In the intercom circuit 4 ', it becomes an intercom signal of an AC component, the DC voltage is superimposed, and it is output as an intercom return signal to the CCU 6'side via the cable 5-1. The intercom return signal sent to CCU 6'is C
It is given to the CU intercom circuit 10, and only the AC component is converted into a voice signal and transmitted to human beings as voice. Also,
The intercom return signal is also given to the intercom return signal detection circuit 11 '. The intercom return signal detection circuit 11 'compares the DC voltage component of the input signal with the signal level of the predetermined reference voltage, and if the input signal has a DC voltage component higher than the reference voltage, Judge that the composite cable 5 is properly connected to the camera head 1'and CCU 6 ', and output the INCOM OK signal to the camera power switch 12'. The camera power switch 12 'responds to the input INCOM OK signal and switches the power supply 1
Control 3'to turn on. If the DC voltage component of the input signal is less than the reference voltage, it means that the camera cable 5 is not properly connected to the camera head 1'or CCU 6 ', or there is a failure such as disconnection. It is judged and the INCOMOK signal is not output from the camera power switch 12 '. Therefore, the power supply switching circuit 13 'remains in the off state without being turned on. This power supply switching circuit 13 'is, for example, INCOM OK as a control signal.
It is a switch that switches to the off state even in the on state when no signal is input. Power supply switching circuit 13 '
When is turned on, for example, the on-state display is displayed on the operation panel of the CCU 6 and the operator turns on the power input terminal 8
To a power supply. A predetermined power supply voltage is input from the power supply input terminal 8 and supplied to the power supply transformer 7.
The power supply transformer 7 converts the supplied predetermined power supply voltage into a predetermined AC voltage, for example, AC 230 V, and outputs it to the power supply switching circuit 13 '. Since the power supply switching circuit 13 'is turned on, the input AC voltage is directly supplied to the cable 5-3, and the camera head 1'
Sent to the main power supply circuit 3'of. Main power supply circuit 3 ′
Generates a necessary voltage for the entire camera head section 1 ', supplies it to each necessary component, and each supplied component operates. However, it is not supplied to the head intercom circuit 4 '.

Intercom return signal detection circuit 11 ', camera power switch 12', and power supply switching circuit 1
In the operation of 3 ′, the intercom return signal detection circuit 11 ′ extracts the DC voltage component of the signal input from the camera cable 5-2 and outputs it to the power supply switching circuit 13 ′ in addition to the above-mentioned embodiment. , The power supply switching circuit 13 'is a DC
A switch that does not turn on unless a voltage higher than the voltage is input as a control signal may be used.

[0022]

As described above, according to the present invention, the CCU
In a television camera device that uses a composite cable to transmit data signals and power supply signals between the camera head and the camera head, a power supply switching circuit and a power supply voltage conversion circuit are added to the camera head by superimposing DC voltage on the intercom signal. It is possible to provide a television camera device that does not need and has a simpler and smaller power supply circuit.

[Brief description of drawings]

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

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

[Explanation of symbols]

1, 1 ': Camera head part, 2: Lens part, 3, 3':
Main power circuit, 4, 4 ': Head intercom circuit,
5: Composite cable, 5-1, 5-2, 5-3: Camera cable, 6, 6 ': CCU, 7: Power transformer, 8: Power input terminal, 9: DC power circuit, 10: CCU intercom circuit , 11, 11 ': Intercom return signal detection circuit, 1
2, 12 ': Camera power switch, 13, 13': Power supply switching circuit, 14: Input power supply switching circuit, 15: Power supply voltage conversion circuit, 16: Power supply separation circuit.

Claims (7)

[Claims] 1. A television camera device for transmitting an intercom signal such as a data or power signal between a camera control unit and a camera head section by using a composite cable, wherein a DC voltage of a predetermined voltage is superimposed on the intercom signal. And transmitting an intercom signal in which the DC voltage is superimposed, the communication method of the television camera device. 2. A television camera apparatus for transmitting an intercom signal such as a data signal or a power source signal by an intercom circuit between a camera control unit and a camera head section by using a composite cable, wherein the camera control section and the camera head section A DC voltage of a predetermined voltage is superimposed on the intercom signal to be transmitted to the camera, and the camera head unit extracts the DC voltage from the received intercom signal on which the DC voltage is superimposed, and extracts the DC voltage according to the extracted DC voltage. A power supply method comprising operating the intercom circuit of the camera head unit. 3. An intercom signal is transmitted between the camera control unit and the camera head section by a intercom circuit using a composite cable,
In a television camera device that supplies power from the camera control unit to the camera head unit, an intercom circuit of the camera control unit superimposes a DC voltage of a predetermined voltage on an intercom signal transmitted from the camera control unit. An intercom circuit is provided, and the camera head section is provided with an intercom circuit for separating a DC voltage and an intercom signal from an intercom signal obtained by superimposing the received DC voltage, and the camera head is provided with the separated DC voltage. A television camera device, characterized in that the intercom circuit of the head portion is operated. 4. The television camera device according to claim 2, wherein the intercom circuit of the camera control unit includes an intercom circuit that superimposes a DC voltage of a predetermined voltage on an intercom signal transmitted from the camera control unit. The camera head unit includes a power supply separation circuit that separates the DC voltage and the intercom signal from the received intercom signal on which the DC voltage is superposed, and the camera head unit of the camera head unit is separated by the separated DC voltage. A television camera device characterized by operating an intercom circuit. 5. The television camera apparatus according to claim 3, wherein the intercom circuit of the camera head unit superimposes a DC voltage on an intercom signal to be transmitted and returns the intercom signal. A television camera device, which is an intercom circuit for transmitting as a signal. 6. The television camera device according to claim 5, wherein the camera control unit includes a detection unit for detecting the return signal of the intercom signal, and a camera head unit for detecting the return value of the intercom signal. A television camera device comprising a control means for switching on / off of the power supply for supplying. 7. The television camera device according to claim 6, wherein the detecting means detects a DC voltage component of the return signal, and compares the detected DC voltage component with a predetermined reference value. A television camera device, comprising: a switcher which is coupled to supply the power to the camera head when the DC voltage component is larger than the predetermined reference value.