Optical information recording medium

Details Optical information recording medium Optical information recording medium

1991-09-26

1995-03-28

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428457, 428913, 430945, 3461351, 347264, B32B 300

Patent

active

054015499

ABSTRACT:
An optical information recording medium includes a ROM region in which information has been recorded in the form of pits in a substrate, and from which the recorded information can be reproduced upon application of a laser beam thereto, and a recording region in which information can be recorded in the form of pits from which the recorded information can be reproduced upon application of a laser beam thereto, with the improvement wherein a reflective layer is provided in a ROM region portion of the substrate in the ROM region, and a recording layer is overlaid on both the reflective layer in the ROM region portion and a recording portion of the substrate in the recording region.

REFERENCES:
patent: 4940618 (1990-07-01), Hamada et al.
patent: 4944981 (1990-07-01), Oguchi et al.
patent: 4950520 (1990-08-01), Imai et al.
patent: 5206063 (1993-04-01), Westerhout

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