Optical disc molding device and molding method for optical disc

Details Optical disc molding device and molding method for optical disc Optical disc molding device and molding method for optical disc

1997-04-14

1998-12-22

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Light polarizing article or holographic article

264106, 425542, 425810, B29D 1700

Patent

active

058523294

ABSTRACT:
An optical disc molding device has a pair of molds for injection molding a disc substrate within cavities, and a stamper supported within at least one cavity, for molding a data recording surface in such a manner that the inside diameter side of the stamper supporting surface of the cavity protrudes inwardly in the disc thickness direction from the data recording surface. The flatness of a laminated reference plane has thus been deteriorated by burrs occurring on a disc substrate.

REFERENCES:
patent: 4879082 (1989-11-01), Kudo et al.
patent: 4979891 (1990-12-01), Kitamura

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