Large diameter optical disk substrate made of polycarbonate

Details Large diameter optical disk substrate made of polycarbonate Large diameter optical disk substrate made of polycarbonate

1987-04-27

1988-08-16

Hart, Charles

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264 11, 264106, 26432817, B29F 108

Patent

active

047643315

ABSTRACT:
A disk substrate for a high-density information recording medium made by injection molding from polycarbonate is disclosed having an average molecular weight from 14,000 to 22,000 and having a thickness from 1.0 to 2.0 mm and a circular recording area of between two concentric circles having a radii of 40 to 170 mm, respectively. The birefringence of the substrate within the recording area is less than 25 mm and is uniformly distributed.

REFERENCES:
patent: 4157931 (1979-06-01), Bricot et al.
patent: 4185955 (1980-01-01), Holmes et al.
patent: 4514357 (1985-04-01), Kawaguchi et al.
Review of the Electrical Communication Laboratories, vol. 32, No. 2, 1984.

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