Method of making a plurality of optical record disc substrates

Details Method of making a plurality of optical record disc substrates Method of making a plurality of optical record disc substrates

1993-11-03

1995-10-17

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...

264 405, 264154, 264161, 2642972, 2643287, 2643288, 425150, 425810, B29C 4556

Patent

active

054588219

ABSTRACT:
A method of making a plurality of optical record disc substrates includes the steps of injecting a resin material into a plurality of disc-shaped cavities which are formed by closing a fixed mold half and a movable mold half; and cooling the injected resin material in the cavities. The cavities are grouped into a plurality of groups so that each group includes not less than one cavity, and each group is provided with a common actuation device so that each actuation device is independently operated.

REFERENCES:
patent: 4091057 (1978-05-01), Weber
patent: 4828769 (1989-05-01), Maus et al.
patent: 4971548 (1990-11-01), Asai
patent: 5015426 (1991-05-01), Maus et al.
patent: 5059364 (1991-10-01), Okubo et al.
patent: 5244606 (1993-09-01), Maus et al.

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