To adequately grasp the situation of an entire job site and to make communication efficient by adding a liquid crystal monitor to an in-cam system and optionally and selectively recognizing the situation of the job site except a place where a mounting person is located as video information in addition to traffic by means of audio.
Respective in-cam devices 1 are constituted by being integrally made into a heat set through the use of a video signal receiving and reproducing liquid crystal monitor 4 and an image pickup camera 5 in addition to an audio receiving and reproducing head phone 2 and an audio signal originating microphone 3. The liquid crystal monitor 4 is provided with the liquid crystal panel of a high density image element number, a half mirror and a liquid crystal shutter so as to selectively project a video signal from the image pickup camera 5, etc., of another in-cam device 1, which is obtained by way of a matrix device 20, as a virtual image in accordance with the operation of a switch box 10 which is carried by a waist belt 7. A background and the virtual image are displayed by superimposition or selectively displayed by the control of the liquid crystal shutter.
TOKAI HIGHTECH KK
MAC KK
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