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  Vidicon

Introduction to Vidicon:

The Vidicon came into common use in the early 50's and gained instantaneous fame due to its small size and easiness of operation. Vidicon works on the principle of photoconductivity, in which the resistance of the target material depicts a marked decrease while exposed to light. Diagram demonstrates the structural configuration of a classic vidicon, and the second diagram depicts the circuit arrangement for developing camera signal output. As displayed there, the target contains a thin photo conductive layer of either antimony or selenium compounds. This layer is deposited on a transparent conducting film, coated on the internal surface of the face plate. This conductive coating is termed as plate or signal electrode. Image side of the photo layer, that is in contact along with the signal electrode, connected to DC supply by the load resistance RL. The beam that comes out from the electron gun is point out on surface of the photoconductive layer through combined action of uniform magnetic field of an external coil and electrostatic field of grid No3. Grid No4 gives a uniform decelerating field among itself, and the photo. Conductive layer, that is why the electron beam approaches the layer with permit velocity to avoid any secondary emission. The beam's Deflection, for scanning the target, is obtained through vertical and horizontal deflecting coils - placed around the tube

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