JPH04114586A - Video camera changeover device - Google Patents

Abstract

PURPOSE:To avoid a trouble of the wiring work and to reduce the quantity of cables required for the wiring work by employing one coaxial line for wiring interconnecting plural monitor cameras and a power adaptor. CONSTITUTION:An oscillation output from an oscillation circuit 11a selected by a camera selection button 4 of a power adaptor 5 is fed to cameras 1a-1c via a connection terminal 10. A camera having a band pass filter 9 whose pass band is in matching with the oscillating frequency is selected among the cameras 1a-1c. When a switch circuit 8 of the camera is closed, power is supplied to a power supply circuit 7 and a signal processing circuit 6. Since the camera is selected by setting a frequency band for addressing to plural monitor cameras and selecting the frequency band from the power adaptor 5, the connection among the cameras and the power adaptor 5 is implemented by using one cable and adopting branch connection. Thus, a trouble of the wiring work is avoided and the total cable length is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a switching device for surveillance cameras in a surveillance system.

[Conventional technology]

A conventional camera device requires coaxial cables for the number of cameras 2, as described in Japanese Utility Model Publication No. 1-59578.

[N problems that the invention attempts to solve]

The above-mentioned conventional technique does not take into consideration the wiring work when there are a large number of tangential surveillance cameras, and has the problem of being cumbersome.

An object of the present invention is to eliminate the troublesomeness of wiring work and to significantly reduce the amount of couple used for wiring work.

[Means to solve the problem]

In order to achieve the above object, the present invention allocates a channel frequency to each surveillance camera and connects the camera 2 on the power adapter side.
You can now select any channel frequency using the changeover switch.

[Effect]

A power adapter that selects an arbitrary surveillance camera 2 with a camera changeover switch outputs a channel frequency corresponding to each switch to the camera side. Further, the camera side is equipped with a bandpass filter corresponding to each channel frequency, and operates to perform 0N10FF control of the power supply circuit based on the output thereof. As a result, the wiring cable between the power adapter and the plurality of monitoring cameras 2 can be shared between the coaxial cable and the wiring cable, thereby eliminating the trouble of wiring work.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. #
FIG. 11 is a diagram showing an embodiment of a surveillance video camera according to the present invention. In FIG. 1, the oscillation output of the oscillation circuit 11& selected by the camera selection button 4 of the power adapter 5 is transmitted to the connection terminal 10. Coaxial cable line 2. And it is applied to the cameras 91a to 10 via the branch terminal 5. camera 1
In a to a10, a camera equipped with a bandpass filter 9 having a passband matching the oscillation frequency is selected, and the switch circuit 8 is turned on, thereby switching on the power supply circuit 7. Power is supplied to the signal processing circuit 6.

According to this embodiment, by setting the address frequency band for multiple surveillance cameras and selecting that frequency from the IE source adapter side, it is possible to switch the cameras. The wiring cables between the power adapter and the power adapter can be branched and connected around -1 cable.

〔Effect of the invention〕

According to the present invention, multiple surveillance cameras can be branched and connected to one cable from the power adapter, which eliminates the hassle of wiring work, and also greatly reduces the total group length required for wiring work. Cost reduction can be achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. Explanation of symbols 1a...Camera, 1b...Camera, 1C...Camera 2.2...Coaxial cable line, 3...Branch terminal, 4...
...Camera selection button, 5...Power adapter, 6...Signal processing circuit, 7...Power supply circuit, 8...Switch circuit, 9...Band pass filter, 10...Connection terminal%
11a... Oscillation circuit, 11b... Oscillation circuit, 110
...Oscillation circuit.

Claims (1)

[Claims] 1. In a surveillance system comprising a plurality of surveillance cameras and a power adapter connected to the plurality of surveillance cameras and equipped with a switching function, the connection between the plurality of surveillance cameras and the power adapter is provided. A video camera switching device characterized in that the wiring is a single coaxial line.