Optical information recording disc

Details Optical information recording disc Optical information recording disc

1997-09-24

1999-11-23

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 644, 428 648, 428457, 428913, 43027013, 4304951, 430945, 369283, 369288, B32B 300

Patent

active

059896698

ABSTRACT:
An optical information recording disc of DVD (Digital Video Disc) type having an information recordable layer(s) between a pair of substrates (i.e., sandwich structure) shows an improved mechanical strength and an improved storage stability when the substrate has an exposed area on its outer peripheral edge and the exposed area is placed in contact with a resin layer, or the substrate has an enlarged surface area (preferably it is exposed) on its outer peripheral edge and the enlarged surface area is placed in contact with a resin layer. An apparatus for preparing an optical information recording disc of DVD type having an improved mechanical strength and an improved storage stability is further disclosed.

REFERENCES:
patent: Re35947 (1998-11-01), Kosinski et al.
patent: 5085910 (1992-02-01), Matsushima et al.
patent: 5213859 (1993-05-01), Aoi et al.
patent: 5382460 (1995-01-01), Onagi et al.
patent: 5635268 (1997-06-01), Miyake et al.

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