VIDEO DISC SYSTEMS — A COMPARISON
Common to all video disc systems is the process in which a program (originally recorded on magnetic tape) is recorded on to a master metal disc. The metal master is then used to mass produce plastic discs which are played on the video dics player (VDP).
Plastic discs for the laser video (LV) optical pick-up system are coated with metal on one side (the recorded surface) and then bonded with the metal inside for protection. Carbon is added to discs for the two capacitive pick-up systems. CED and VHD, to make the disc conductive. A lubricant for smoothing the pickup and reducing wear is added to the CED discs. This lubricant is necessary because the CED system has grooves on the disc for stylus tracking. This makes ...
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