JPH06105313A - Itv system - Google Patents

Abstract

PURPOSE:To facilitate the installation of an ITV camera and the change of the installing place and to make the ITV camera portable by selecting the start of transmission corresponding to a select signal from a base station in the case of sending a video signal from the ITV signal to the base station. CONSTITUTION:The select signal generated by a select switch 14 of the base station is modulated with a carrier by a remote control transmitter 13, passed through a multicoupler 10 and radiated from an LCX 9 to the space as a radio wave. The radio wave is received by an antenna 8a, passed through a multicoupler 7a and demodulated by a remote control receiver 6a. It is judged the select signal is addressed to its own station, and the transmission of a video modulator 5a connected to an ITV camera 1a is started. For the radio wave received from the modulator 5a to the LCX 9, the video signal is transmitted from the multicoupler 10 to a video clemoclulator 11, and a picture is projected on a monitor TV 12. Since the start of transmission is selected by the select signal from the base station, a coaxial cable is unnecessitated, the installation of the ITV camera 1a and the change of the installing place can be facilitated, and the ITV camera can be made portable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ITV (industrial television) system.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional example of an ITV system. As shown in the figure, the ITV camera 1
In an ITV system having a plurality of a, 1b, ... 1n, video signals from the ITV cameras 1a, 1b, ... 1n are transmitted to one ITV camera via one coaxial cable 2 and a video switching device 3, The image is displayed on the monitor TV 4.

[0003]

The above-mentioned prior art has the following two problems.
There are two problems.

(1) Coaxial cables are required for the number of ITV cameras, which requires labor and cost for cable laying.

(2) When trying to change the mounting location of the ITV camera, it is necessary to relocate the coaxial cable as well, which is troublesome and expensive as in the above case.

The present invention has been made in view of the above points, and an object of the present invention is to provide an ITV system in which an ITV camera can be easily installed and the installation place can be changed, and which can be portable. .

[0007]

SUMMARY OF THE INVENTION The above-mentioned object is to share an ITV system with a series connection of a remote control receiver and a first duplexer connected in series to an image modulator of an ITV camera, and this series connection. And a leaky coaxial cable (hereinafter referred to as LCX)
Say. ), A second duplexer connected to this LCX, a monitor TV connected to this duplexer via a video demodulator, and a selection connected to the second duplexer via a remote control transmitter. This is achieved by configuring with a switch.

[0008]

Since the above means is provided, when the video signal from the ITV camera is wirelessly transmitted to the base station, the start-up selection of the transmission is performed by the selection signal from the base station.

[0009]

EXAMPLES Next, the present invention will be specifically described by way of examples.

[Embodiment 1] FIG. 1 shows an embodiment of the present invention. Since the same parts as those of the prior art are designated by the same reference numerals, the description thereof will be omitted. In this embodiment, the ITV system is used as a video modulator 5a of the ITV camera 1a (1b ... 1n).
Remote control receiver 6a serially connected to (5b ... 5n)
(6b ... 6n) and the first duplexer 7a (7b ... 7n)
And the duplexer 7a (7b ...
7n) connected to the antenna 8a (8b ... 8n), and the LCX arranged to face the antenna 8a (8b ... 8n)
9, and a second duplexer 10 connected to this LCX9,
A monitor TV 12 connected to the sharing device 10 via a video demodulator 11, and a remote control transmitter 1 to the second sharing device 10.
3 and the selection switch 14 connected via 3. By doing this, the ITV camera 1a
When the video signals from (1b ... 1n) are wirelessly sent to the base station, the start signal of the transmission is selected by the selection signal from the base station, which eliminates the need for the coaxial cable as in the conventional case, and ITV It is possible to obtain the ITV system in which the cameras 1a (1b ... 1n) can be easily installed and the installation place can be changed, and which can be portable.

That is, the selection signal generated by the selection switch 14 of the base station is modulated on the carrier by the remote control transmitter 13 and passes through the second duplexer 10 to the LCX9.
Is radiated as a radio wave from the space. Radio wave is antenna 8a
Is received by the remote control receiver 6 through the first duplexer 7a.
After it is demodulated by a and it is judged that the selection signal is for the own station, the transmission of the video modulator 5a connected to the ITV camera 1a is started.

The radio wave received by the LCX 9 from the video modulator 5a is returned as a video signal from the second duplexer 10 to the video demodulator 11 and projected on the monitor TV 12.

The ITV camera 1a, the image modulator 5a,
The remote control receiver 6a, the first duplexer 7a and the antenna 8a are housed in a case 15a. Other IT
V camera 1b, video modulator 5b, remote control receiver 6b,
The first duplexer 7b and the antenna 8b are the case 15b.
In addition, the ITV camera 1n, the image modulator 5n, the remote control receiver 6n, the first duplexer 7n and the antenna 8n are housed in the case 15n, respectively, but any one of the image modulators 5a to 5n is transmitted depending on the selection signal. Will stand up.

In the above description, the video modulators 5a ... 5n
Is a method of transmitting the same carrier. Since interference occurs when the transmission of a plurality of video modulators 5a ... 5n rises at the same time, it is intended to select and transmit from only one video modulator.

There is also a method of changing the frequency of the carrier wave so as not to cause interference, but there is a problem that the second duplexer 10 for discriminating signals by frequency becomes complicated. ITV
Although it is technically feasible if the number of cameras 1a ... 1n is several, there are many cases where the number of cameras is several tens in an actual ITV system, and then the second duplexer 10 is technically unrealizable. Becomes

The LCX9 can be replaced with a general antenna.

By accommodating the device portion including the ITV camera 1a (1b ... 1n) in the case 15a (15b ... 15n), the case is made portable.

As described above, according to this embodiment, the following effects can be obtained.

(1) Since it is not necessary to lay a large number of coaxial cables as transmission lines, the system is inexpensive.

(2) The ITV camera can be easily relocated.

(3) In the case of the portable type, since it can be moved to any place where radio waves can reach, it is necessary to equip only the minimum necessary number of portable devices with ITV cameras and install them according to the operating condition. It is economical. In the case of monitoring a place where the work place changes sequentially, such as a construction in a long cave, if there is a portable device at a necessary place, there is an effect that it can be used immediately without installation work such as cables.

[0022]

As described above, according to the present invention, an ITV system is used in series with a remote control receiver and a first duplexer connected in series to an image modulator of an ITV camera, and the series connection is shared. An antenna connected to the receiver, an LCX arranged to face the antenna, a second duplexer connected to the LCX, a monitor TV connected to the duplexer via a video demodulator, and a second Since it was configured with a selector switch connected to the duplexer via the remote control transmitter,
When the video signal from the ITV camera is wirelessly sent to the base station, the start-up selection of transmission is performed by the selection signal from the base station, which eliminates the need for the coaxial cable as in the past, and installs the ITV camera Further, it is possible to obtain an ITV system in which the installation location can be easily changed and which can be portable.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of an ITV system of the present invention.

FIG. 2 is an explanatory diagram of a conventional ITV system.

[Explanation of symbols]

 1a, 1b, 1n ITV camera 5a, 5b, 5n Video modulator 6a, 6b, 6n Remote control receiver 7a, 7b, 7n First duplexer 8a, 8b, 8n Antenna 9 LCX 10 Second duplexer 11 Video Demodulator 12 Monitor TV 13 Remote control transmitter 14 Selection switch 15a, 15b, 15n Case

Front Page Continuation (72) Inventor Minoru Yamamoto 5-1-1 Hidaka-cho, Hitachi City, Ibaraki Hitachi Cable Co., Ltd. Hidaka Factory

Claims (2)

[Claims] 1. In an ITV system in which a plurality of ITV cameras each having a video modulator are arranged, a series connection body of a remote control receiver and a first duplexer serially connected to the video modulator of the ITV camera. , An antenna connected to the duplexer of this series connection body, a leaky coaxial cable arranged opposite to this antenna, a second duplexer connected to this leaky coaxial cable, and a video demodulator to this duplexer. An ITV system comprising a monitor TV connected via a remote controller and a selection switch connected to the second duplexer via a remote control transmitter. 2. The ITV system according to claim 1, wherein the ITV camera, the image modulator, the first duplexer, the remote control receiver and the antenna are housed in a movable case.