Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Patent
1996-08-27
1998-12-22
Angebranndt, Martin
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
430945, 369288, 3461351, G11B 724
Patent
active
058517294
ABSTRACT:
An optical disc having, as a recording layer, a first Sb--Se based thin film, a Bi--Te based thin film and a second Sb--Se based thin film, deposited in this order on a disc substrate, and a thin Al film deposited on the recording layer, is disclosed. Each of the first Sb--Se thin film and the second Sb--Se thin film has a composition such that Se accounts for not less than 70 atm % of the composition. The film thicknesses of the first Sb--Se based thin film and the second Sb--Se based thin film are set to not larger than 30 nm and to 15 to 25 nm, respectively, with the reflectance of the recording layer with respect to the laser beam with a wavelength of 680 nm being 10 to 25%. Alternatively, the first Sb--Se based thin film is of Sb.sub.2 Se.sub.3, the Bi--Te based thin film is of Bi.sub.2 Te.sub.3 and the second Sb--Se based thin film is of Sb.sub.2 Se.sub.3, and the film thickness of the second Sb--Se based thin film is set to 15 to 25 nm, so that the reflectance of the recording layer with respect to the laser beam with a wavelength of 680 nm will be 10 to 25%.
REFERENCES:
patent: 4460636 (1984-07-01), Watanabe
patent: 4587533 (1986-05-01), Nakane et al.
patent: 4645712 (1987-02-01), Ishigaki et al.
patent: 4725502 (1988-02-01), Kiyomiya et al.
Igarashi Shuichi
Takeuchi Atsushi
Yoshida Mikio
Angebranndt Martin
Sony Corporation
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