Stock material or miscellaneous articles – Circular sheet or circular blank
Patent
1998-05-21
2000-03-07
Evans, Elizabeth
Stock material or miscellaneous articles
Circular sheet or circular blank
428 644, 428 645, 428913, 43027013, 4304951, 430945, 369283, 369288, B32B 300
Patent
active
060337524
ABSTRACT:
The present invention provides an optical recording medium which incorporates an inorganic based recording layer which has a high reflectance, sufficient for reproduction compatibility on devices such as CD-ROM drives, as well as a high degree of modulation between the state prior to recording and that after recording, as well as an information recording method therefor. Accordingly, an optical recording medium comprises a substrate (2) which is substantially transparent with respect to a recording light beam and a reproduction light beam, a first recording layer (3) which is layered on top of the substrate (2) and which incorporates as the main constituent a metal which has a low melting point and a high reflectance, and a second recording layer (4) which is layered on top of the first recording layer (3) and which will, due to heat generated from irradiation of a light beam through the substrate (2), either mix, or alternatively react, with the first recording layer (3) to form an alloy of low reflectance as well as forming irregularities or pitting in the surface, thereby enabling the recording of information. Due to the heat generated from irradiation of a recording light beam through the substrate (2) the first recording layer (3) and the second recording layer (4) are either mixed, or alternatively reacted to form an alloy as well as forming irregularities or pitting in the surface, thereby recording information.
REFERENCES:
patent: 5580632 (1996-12-01), Ohkawa et al.
patent: 5652037 (1997-07-01), Ohkawa et al.
patent: 5817389 (1998-10-01), Ono
Kobayashi Isao
Onda Tomohiro
Shiomi Hiroyuki
Suzuki Koichiro
Uchida Koji
Evans Elizabeth
Kao Corporation
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