C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
117/96, 352/32.1
C03C 23/00 (2006.01) B24B 1/00 (2006.01) G03F 7/16 (2006.01) G11B 7/0045 (2006.01) G11B 7/26 (2006.01)
Patent
CA 1186570
ABSTRACT OF THE DISCLOSURE Methods for use in producing a disc-shaped record- ing master having a thin photoresist recording layer for storing an f.m. information signal with high density. During recording, 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, 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.
377670
Discovision Associates
Gowling Lafleur Henderson Llp
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