Disc substrate used for an optical disc and a molding die for mo

Details Disc substrate used for an optical disc and a molding die for mo Disc substrate used for an optical disc and a molding die for mo

1996-12-17

1998-10-27

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428 652, 428913, 425549, 3692754, B32B 300

Patent

active

058275932

ABSTRACT:
A disc substrate inject-molded comprises; a first circular surface having an inner non-data region formed around a center hole thereof and an outer data region formed around the non-data region; a second circular flat surface opposite and parallel to the first circular surface; and a ring shaped stack-rib formed on the non-data region.

REFERENCES:
patent: 5059473 (1991-10-01), Takahashi et al.
patent: 5092759 (1992-03-01), Lichtinger et al.
patent: 5460763 (1995-10-01), Asai et al.
patent: 5476700 (1995-12-01), Asai et al.

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