Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1992-02-14
1993-10-12
Ryan, Patrick J.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428 65, 428457, 428913, 346 76L, 3461351, 430945, B32B 300
Patent
active
052523705
ABSTRACT:
A recording thin film, a dielectric thin film, and a reflective thin film are stacked on a surface of a substrate in the described order. Upon exposure to recording laser light, an inorganic compound in the recording thin film decomposes to release a gas, creating a space in the recording thin film. Since the substrate is also heated and softened, a recess is created in the substrate surface due to the pressure of evolving gas. The space and recess cause a change of optical conditions, resulting in a substantial lowering of reflectivity where the laser light is irradiated. This enables reproduction in accordance with the CD standard. The use of an inorganic compound which decomposes to release a gas upon heating rather than organic dyes ensures better light resistance, leading to highly reliable information storage. Recording sensitivity is high.
REFERENCES:
patent: 5080947 (1992-01-01), Yamada et al.
Nikkei Electronics; Jan. 23, 1989 (No. 465); p. 107.
The Functional Dye Department of the Kinki Chemical Society; Mar. 3, 1989; p. 1520.
SPIE, vol. 1078, Optical Recording Topical Meeting (1989); pp. 80-87.
Dohi Hideki
Tominaga Junji
Evans Elizabeth
Ryan Patrick J.
TDK Corporation
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