JPH0515544U - Power supply superposition coaxial line branching device - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to connect a video monitor directly to the branch end of a line on which a DC power supply is superimposed. [Structure] A capacitor 3 for blocking a DC power source voltage is provided in advance between a relay plug connector 1 of a coaxial line and a branch output plug connector 2, and is connected to the branch output plug connector 2. A resistor 4 for protecting the device input circuit is connected, and the circuit components are integrated as an integrated structure. [Effect] Since the DC power supply voltage is not output to the branch output end and only the signal component in the coaxial line is output, an overvoltage is applied to the signal input circuit such as a video monitor connected to the branch output. It is safe to join.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coaxial line branching device used in a TV camera monitoring system or the like, and more particularly to a power supply superimposing coaxial line branching device used for a coaxial line on which power is superimposed.

[0002]

[Prior Art]

 As shown in FIG. 3, a conventional coaxial line branching device (commonly called “T branch plug”) is provided with a coaxial line relay connector 1 and a branch output connector 2. . And, if you want to block the superimposed DC voltage from the line on which the DC power is superimposed and you want to obtain only the signal component, the branch output end is connected in DC, so an external DC blocking capacitor is used. After adding differently, the target signal component was obtained.

[0003]

[Problems to be solved by the device]

 However, in this conventional coaxial line branching device, a capacitor for blocking the DC power supply voltage component is added differently to the branching output side, which makes the work complicated at the actual work site. Therefore, there was a problem that the number of parts increased correspondingly.

The present invention has been made in view of the above problems, and it is possible to connect without adding different parts when necessary, and to improve work efficiency, a branch device for a power supply superimposed coaxial line. For the purpose of providing.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the branch device for a power-supply superposed coaxial line of the present invention comprises a blocking capacitor for a DC power supply voltage, a branching capacitor, and a branching capacitor between the relay connector and the branch output connector of the coaxial line. The output connector is provided with a resistor for protecting the device input circuit connected from the outside.

[0006]

[Action]

 According to the power supply superposed coaxial line branching device having the above configuration, the DC power supply voltage superposed portion is blocked from the line on which the DC power supply is superposed by the capacitor, and the connection destination externally connected to the branch output connector. Generation of transient current that flows through the capacitor to the input circuit is suppressed.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing a power superimposing coaxial line branching device 5 according to an embodiment of the present invention.

In the figure, reference numeral 1 is a coaxial line relay connector, and 2 is a branch output connector. A capacitor 3 for blocking a DC power source voltage is provided between the (main line) relay plug connector 1 of the coaxial line and the branch output plug connector 2 thereof. Further, when a video monitor or the like is externally connected to the branch output connector 2, a protective resistor 4 is provided for suppressing the transient current from flowing through the capacitor 3 to the connected input circuit. . As a result, the branch output connector 2 has a circuit configuration in which only the signal component in the coaxial line is output.

FIG. 2 shows an actual usage example in which the power supply superimposing coaxial line branching device 5 according to the embodiment of the present invention is inserted in a TV camera monitoring system line. A branching device 5 for the power supply superimposing coaxial line is inserted therein. In this example, for example, when the installation location of the camera 7 and the video monitor 9 that finally monitors the image of the camera 7 via the power supply controller 8 are apart from each other, the angle of view position adjustment of the camera 7 is performed. In the past, if a general-purpose camera is used, the angle of view of the camera can be adjusted by connecting the image monitor directly to the camera image output section. This is not possible with the method of operating the camera with the superimposed DC voltage). Therefore, when adjusting the angle of view of the camera, it is necessary to adjust the optimum angle of view while maintaining contact with the worker who is on the installation side of the monitoring video monitor 9.

On the other hand, if the branching device 5 for the power-supply superposed coaxial line according to the present embodiment is used, the video signal output from the camera 7 can be directly displayed on the work video monitor 6 at the camera installation site. It is possible to independently perform the work of adjusting the angle of view while monitoring.

The DC power supply voltage is not output to the branch output end, and only the signal component in the coaxial line is output. Therefore, a signal input circuit such as a video monitor used by connecting to the branch output is used. It is safe because no overvoltage is applied to it.

[0012]

[Effect of the device]

 As described above, according to the power supply heavy-duty coaxial line branching device of the present invention, since the capacitor for blocking the DC power supply voltage is provided inside the branching device, there is no need to separately provide parts. Because it is good, it is possible to improve the work efficiency in the field such as the power supply superimposing camera system. In addition, there is a safety effect that the power supply voltage is not directly applied to the branch output connector when performing maintenance and inspection of general power supply coaxial lines.

[Brief description of drawings]

FIG. 1 is a circuit diagram illustrating a power superimposing coaxial line branching device according to an embodiment of the present invention.

FIG. 2 is a system diagram when one embodiment of the present invention is used in an actual system.

FIG. 3 is a circuit diagram showing an example of a conventional coaxial line branching device.

[Explanation of symbols]

 1 Coaxial line relay connector 2 Branch output connector 3 Capacitor 4 Resistor 5 Power supply superimposed coaxial line distributor

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A capacitor for blocking a DC power supply voltage, which is provided between a relay connector and a branch output connector of the coaxial line.
A branching device for a power supply superposed coaxial line, wherein a branching output connector is provided with a resistor for protecting a device input circuit connected from the outside.