Process for making optical disk substrates

Details Process for making optical disk substrates Process for making optical disk substrates

1996-11-26

1998-01-06

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Changing mold size or shape during molding or with shrinkage...

264107, 2643287, 425149, 425150, 425810, B29C 4556

Patent

active

057051054

ABSTRACT:
A process for producing high-density thin type optical disk substrates having good replicability and birefringence sufficient for practical use. In filling the resin into the cavity, the stress on the resin is reduced by controlling the relation of the cavity width and the injection compression force to reduce birefringence. Further, the mirror surface of the mold is maintained at a certain temperature to facilitate the resin flow and a good replicability and reduction of birefringence is achieved by terminating the resin filling and starting the compression process at the time at which the pressure of the resin filling is at a minimum.

REFERENCES:
patent: 4772196 (1988-09-01), Asai
patent: 4849151 (1989-07-01), Tamura et al.
patent: 4986938 (1991-01-01), Izuka et al.
patent: 5002706 (1991-03-01), Yamashita
patent: 5044925 (1991-09-01), Watanabe
patent: 5130075 (1992-07-01), Hara et al.
patent: 5417899 (1995-05-01), Kitamura
patent: 5451363 (1995-09-01), Minamimura et al.
patent: 5552094 (1996-09-01), Kubota
Rosato et al., Injection Molding Handbook, published by Van Nostrand Reinhold Company of New York, pp. 103-105 and 170-172 (1986).

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