Process for producing substrate for optical disk by annealing su

Details Process for producing substrate for optical disk by annealing su Process for producing substrate for optical disk by annealing su

1988-01-26

1990-01-09

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

264 13, B29D 1100

Patent

active

048926922

ABSTRACT:
In a process for producing a substrate for optical disks, first a disk-shaped substrate is formed with polycarbonate with such gradient distribution of double refraction that the value of double refraction is in a range from -10 to -30 nm in the vicinity of the external periphery of the substrate and is in a range from +10 to +30 nm in the vicinity of the center thereof, and then thus formed substrate is annealed.

REFERENCES:
patent: 4514357 (1985-04-01), Kawaguchi et al.
patent: 4627809 (1986-12-01), Okabayoshi et al.

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