JPH07298252A - Monitoring camera system of power supply superimposition type - Google Patents

Abstract

PURPOSE:To simplify the wiring work and to make a case of a power supply section small by providing a power supply section and plural television cameras connected in cascade to the power supply section with a coaxial cable and selecting and outputting any video signal from the plural cameras with a control signal from the power supply section so as to reduce the number of power supply sections and coaxial cables with respect to the number of sets of the cameras to the utmost. CONSTITUTION:Plural television cameras 1 are interconnected in cascade with using coaxial cables 22 and the coaxial cables 22 are connected to an output connector 12 of a power supply section 11. The power supply section 11 encodes each camera drive voltage and a camera number of each television camera 1 and superimposes the coded signal onto a synchronizing signal and sends the signal to the camera 1 through the output connector 12. Each camera number is set to each television camera individually and the camera number added to the synchronizing signal sent from the power supply section 11 is discriminated and when the number is coincident with the preset camera number, a video signal of the television camera 1 whose number is identified is outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power superimposing type surveillance television camera device in which a power source section and a camera are connected by a coaxial cable.

[0002]

2. Description of the Related Art Conventionally, in a power supply type surveillance television camera apparatus having a plurality of television cameras, the connection between the power source section and the cameras has the configuration shown in FIG. That is, the number of cameras 1 and the number of output connectors 12 of the power supply unit 11 are the same, and moreover, they are connected by the same number of coaxial cables 22.

[0003]

In the above-mentioned prior art,
As the number of cameras increased, it was necessary to increase the number of output connectors in the power supply section, and as a result, it was necessary to increase the size of the housing. Further, when using one power source for each camera, as many power supply units as camera units are required. At the same time, the wiring between the power supply unit and the cameras is required for the number of cameras. An object of the present invention is to reduce the number of power supply units and the number of coaxial cables between the power supply units and cameras with respect to the number of cameras, to simplify the wiring work and to miniaturize the housing of the power supply units.

[0004]

In order to achieve the above object, the present invention has a structure in which a plurality of television cameras are continuously connected to a coaxial cable, and the coaxial cable is connected to one output connector of a power source section. . This output connector encodes the TV camera drive voltage and the camera number of each TV camera, superimposes it on the synchronization signal, and sends it to the camera side. On the TV camera side, the number of the device itself is decided and set in advance, the camera number added to the synchronization signal sent from the power supply unit is discriminated, and it matches the camera number set for the device itself. When this is done, the video signal of the TV camera is output.

[0005]

As a result, by switching the coded camera number sent from the power supply unit, only the video signal of a predetermined camera can be taken out from a plurality of TV cameras connected in cascade and displayed on the monitor. .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. In FIG. 1, a camera number arbitrarily or automatically selected by the camera number control circuit 14 of the power supply unit 11 (generally, a camera identification code such as a number, a character, a symbol is encoded, and the camera number addition circuit 13 , The sync signal generated from the signal generating circuit 16 is added, and the sync signal and the power supply are superimposed by the sync signal superimposing circuit 15 and the power supply voltage superimposing circuit 19, and the input of the camera 1 is performed via the output connector 12 and the coaxial cable 22. It is input to the connector 9.

The camera number discriminating circuit 7 discriminates whether or not the input signal is the set number of the own device. If YES, the video output control circuit 6 issues a command to the signal processing circuit 3, and the image pickup section. The video signal obtained in 2 is output and the video signal processing circuit 4 outputs the video signal to the power supply unit 11. The video signal sent to the power supply unit 11 is separated from the power supply voltage by the power supply voltage separation circuit 17, and the video output is obtained from the video output connector 21 via the video signal output circuit 18.

When the camera number discriminating circuit 7 of the camera 1 discriminates that it is not the set number of the own device, the video signal output from the signal processing circuit 3 is turned off and the video signal is not output.

On the other hand, the signal input to the input connector 9 of the camera 1 through the output connector 12 of the power source section 11 and the coaxial cable 22 is sent from the output connector 10 to the next camera connected in cascade. Then, the video signal of the camera having the same camera number is fetched, and its operation is the same as that described above.

FIG. 2 shows an example of system connection of a power supply superimposing type surveillance camera apparatus according to the present invention. In this example, the four cameras 1 and the power supply unit 11 installed in the monitoring place 23 are wired in a cascade connection by the coaxial cable 22. FIG. 3 is a system connection example of a power superposition type surveillance camera apparatus showing another embodiment of the present invention. In this example, when there are a plurality of output connectors (two in this example) in the power supply section, the monitoring location 2
In the camera 1 and the power supply unit 11 installed in No. 3, the coaxial cable 22 between the power supply unit 11 and the camera 1 can be wired in the shortest distance depending on the installation location of the power supply unit 11.

[0011]

According to the present invention, in a power supply type surveillance camera device, a plurality of cameras can be connected in series to one output connector of the power supply unit, so that the size of the power supply unit can be reduced even if the number of cameras increases. There is an advantage that it can be miniaturized and the number can be reduced. In addition, the coaxial cable between the power supply and the camera can be shortened and simplified during wiring work, which is economical.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a system connection diagram in one embodiment of the present invention.

FIG. 3 is a system connection diagram in another embodiment of the present invention.

FIG. 4 is a system connection diagram showing a conventional method.

[Explanation of symbols]

 1 camera 2 image pickup section 3 signal processing circuit 4 video signal superposition circuit 5 power supply circuit 6 video output control circuit 7 camera number discrimination circuit 8 sync signal separation circuit 9 input connector 10 output connector 11 power supply section 12 output connector 13 camera number addition circuit 14 Camera number control circuit 15 Synchronous signal superposition circuit 16 Signal generation circuit 17 Power supply separation circuit 18 Video signal output circuit 19 Power supply superposition circuit 20 DC power conversion circuit 21 Video output connector 22 Coaxial cable 23 Monitoring place

Claims (1)

[Claims] 1. A power supply unit, a plurality of television cameras cascade-connected to the power supply unit via a coaxial cable, and a control signal from the power supply unit for switching and outputting video signals of the plurality of cameras. A power supply superimposing type surveillance camera device.