Apparatus for making a plurality of optical record disc subtrate

Details Apparatus for making a plurality of optical record disc subtrate Apparatus for making a plurality of optical record disc subtrate

1995-07-06

1997-07-15

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Article ejector or stripper control

264 405, 264106, 264154, 264161, 425145, 425147, 425556, 425810, B29C 4580

Patent

active

056481055

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: 3989436 (1976-11-01), McNeely et al.
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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