Optical recording medium having a plurality of discrete phase ch

Details Optical recording medium having a plurality of discrete phase ch Optical recording medium having a plurality of discrete phase ch

1995-12-20

1997-01-07

Ryan, Patrick

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428 642, 428 644, 428 645, 428 647, 428913, 4302701, 43027011, 43027012, 43027015, 430945, 3692751, 3692752, 3692754, 369283, 369288, B32B 300

Patent

active

055915019

ABSTRACT:
A phase change optical recording medium which includes 1) a substrate having a planar surface; and 2) a plurality of discrete data recording points deposited upon the substrate. The discrete data recording points are formed from a phase change material which changes from a state of a first relative order to a state of a second relative order and visa versa upon the application of optical beam energy. Preferably the phase change material forming the plurality of discrete data recording points is deposited within individual cavities embossed into the surface of the substrate. More preferably the individual cavities are cylindrical or parabolic (bowl shaped) cavities having their central axis perpendicular to the plane of the surface of the substrate.

REFERENCES:
patent: 5063097 (1991-11-01), Hirota et al.
patent: 5401549 (1995-03-01), Watase
patent: 5418030 (1995-05-01), Tominaga et al.

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