Optical recording medium

Details Optical recording medium Optical recording medium

2005-04-05

2005-04-05

Mulvaney, Elizabeth (Department: 1774)

Stock material or miscellaneous articles

Circular sheet or circular blank

C428S064400, C430S270120

Reexamination Certificate

active

06875489

ABSTRACT:
An optical recording medium which comprises a 0.3 to 2.0 mm-thick substrate made from a thermoplastic resin and having embossed pits or guide grooves, a reflection layer formed on the substrate and a 3 to 200 μm-thick transparent protective layer formed on the reflection layer and which reproduces recorded information based on a change in the intensity of reflected light by applying a light beam from the transparent protective layer side, whereinthe substrate is formed from a polycarbonate resin having a specific chemical structure and a thermoplastic resin having specific physical properties.According to the present invention, there is provided an optical recording medium for surface recording and reproduction having a simple structure. Particularly, there is provided an optical recording medium having high recording density.

REFERENCES:
patent: 6159572 (2000-12-01), Kobayashi et al.
patent: 6503974 (2003-01-01), Ogasawara et al.
patent: 2000-109669 (2000-04-01), None
patent: 2002-117580 (2002-04-01), None

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