Process for making optical disk substrates

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

1995-06-16

1997-11-04

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Light polarizing article or holographic article

264 22, 264107, 264 405, 2643287, 26432816, B29C 4556

Patent

active

056836309

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: 4849151 (1989-07-01), Tamuar et al.
patent: 4986938 (1991-01-01), Izuka et al.
patent: 5002706 (1991-03-01), Yamaashita
patent: 5044925 (1991-09-01), Watanabe
patent: 5130075 (1992-07-01), Hara et al.
patent: 5417899 (1995-05-01), Kitamura
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.

Affiliated with

Also associated with

Rating

Process for making optical disk substrates does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for making optical disk substrates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for making optical disk substrates will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1830589