Mold device for fabricating disc substrate

Details Mold device for fabricating disc substrate Mold device for fabricating disc substrate

1993-01-14

1995-06-27

Nguyen, Khanh

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With product ejector

425422, 425436R, 425436RM, 425810, 264107, 249 661, B29C 4538, B29C 4540, B29D 1700

Patent

active

054275202

ABSTRACT:
A metal mold device for molding a disc substrate formed by molding a synthetic resin material and having a raised portion on the inner surface of the disc substrate, includes a fixed metal mold and a movable metal mold for defining together a mold cavity for molding the disc substrate. A mold releasing resistance in the form of suitably sized projections or recesses, is provided at a portion of the fixed metal mold or the movable metal mold mating with the outer rim of the disc substrate being molded or at the outer peripheral surface of the raised portion to permit an as-molded disc substrate to be released easily and reliably from a stamper bearing a pattern of pits and lands or pre-grooves and to prevent molding distortions from being produced in the disc substrate being molded.

REFERENCES:
patent: 3687591 (1972-08-01), Perego
patent: 4155698 (1979-05-01), Aichinger
patent: 4327047 (1982-04-01), McNeely
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patent: 4372741 (1983-02-01), Cane et al.
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patent: 5092758 (1992-03-01), Tanaka et al.
patent: 5092759 (1992-03-01), Lichtinger et al.
patent: 5106553 (1992-04-01), Onisawa et al.
patent: 5160751 (1992-11-01), Eichlseder et al.
patent: 5180595 (1993-01-01), Kinoshita

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