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Consumer Electronics by S. P. Bali

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MONOCHROME TV CAMERA

Simplified diagram of a typical monochrome television camera is given in Fig. 30.23. An optical system focuses light reflected from the scene onto the face plate of the camera tube. Aphotoelectric process transforms the light image into a virtual electronic replica in which each picture element is represented by a voltage. A scanning beam in the pick-up tube next converts the picture, element by element, into electrical impulses. At the output an electrical sequence developes that represents the original scene. The output of the camera tube is then amplified to provide the video signal for the transmitter. A sample of the video signal is also provided for observation in a CRT viewfinder mounted on the camera housing.

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