G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.4, 352/10
G11B 7/26 (2006.01) C03C 17/36 (2006.01)
Patent
CA 1194595
METHOD FOR FORMING VIDEO DISCS ABSTRACT OF THE DISCLOSURE Methods for use in producing a disc-shaped recording master having a thin photoresist recording layer for storing an f.m. information signal with high density. During record- ing, an intensity-modulated writing beam is focused onto the photoresist layer, to form a succession of spaced exposed regions arranged in a plurality of substantially circular and concentric recording tracks. The master further includes a glass substrate having a specially prepared surface r and the photoresist layer is deposited on the surface using a technique that ensures a uniform thickness and a uniform sensitivity to the writing beam. The peak intensity of the writing beam is selectively adjusted such that the succession of spaced exposed regions is formed with an optimum 50/50 duty cycle. After development to remove the spaced exposed regions, the recording master is used to produce a metallic stamper that, in turn, is used to produce disc replicas. Determina- tion of the optimum peak intensity of the recording beam is determined by adjusting the peak intensity of the beam for each of a plurality of adjacent tracks, developing the layer and examining the successive sets of tracks to determine that having the optimum value of duty cycle.
434535
Discovision Associates
Gowling Lafleur Henderson Llp
LandOfFree
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