I
icon Small graphical representation displayed on the screen to illustrate a computer function. For example, a representation of a file folder to indicate a directory.
iconoscope The earliest form of TV camera tube in which the optical image of the scene to be televised is focused on a photo-emissive target mosaic which is obliquely scanned by a high-velocity electron beam.
The mosaic is deposited on one face of a mica sheet which is backed by a conductive signal plate from which the output of the tube is taken. When the optical image is focused on the mosaic, photo-electrons are released from each element in proportion to the light falling on it. Thus a positive charge image is built up on the mosaic surface and this grows with time ...
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