Optical disk formation member for making an optical disk substra

Details Optical disk formation member for making an optical disk substra Optical disk formation member for making an optical disk substra

1995-04-25

1997-10-21

Vargot, Mathieu D.

Plastic article or earthenware shaping or treating: apparatus

Means forming a mold; or flask, per se

264 133, 425810, B29D 1100

Patent

active

056793863

ABSTRACT:
An optical disk formation member has a center and an outer periphery. A tracking guide groove formation portion and a prepit formation portion are provided on the member. A first land plane on an internal peripheral side of the prepit formation has a depth that is different from a second land plane on the external peripheral side of the prepit formation portion. The second land plane, furthermore, is deeper than the first land plane on the internal peripheral side of the prepit formation portion.

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