Method for injection molding of optical discs

Details Method for injection molding of optical discs Method for injection molding of optical discs

1997-06-13

1999-04-27

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Light polarizing article or holographic article

264107, B29D 1100

Patent

active

058978143

ABSTRACT:
In a method for controlling the heat transfer in a process for molding an optical disc of the type having a plurality of laser readable depressions of a predetermined quality, the process steps include injecting molten thermoplastic material into a mold having opposing surfaces for replicating respective opposite sides of the disc and imparting optically readable depressions of a predetermined quality to at least one side of said disc, opposing thermally conductive members, and a pair of insulating members, with each insulating member positioned between said conductive mold body and a respective opposing thermally conductive member, maintaining said thermally conductive mold body at a temperature less then about 90 degrees Centigrade wherein said insulting members are selected so that the molten thermoplastic resin is evenly and rapidly cooled from opposing sides to a temperature within about 5 degrees Centigrade of the glass transition temperature of said resin.

REFERENCES:
patent: 4225109 (1980-09-01), Yotsutsuji et al.
patent: 4783041 (1988-11-01), Sakaida et al.
patent: 5041247 (1991-08-01), Kim
patent: 5124192 (1992-06-01), Kim et al.
patent: 5176839 (1993-01-01), Kim
patent: 5288519 (1994-02-01), Baumgartner et al.
patent: 5290597 (1994-03-01), Baumgartner et al.
patent: 5302467 (1994-04-01), Baumgartner et al.
patent: 5324473 (1994-06-01), Baresich
patent: 5376317 (1994-12-01), Maus et al.
patent: 5388803 (1995-02-01), Baumgartner et al.
patent: 5458818 (1995-10-01), Kim et al.

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