Stock material or miscellaneous articles – Surface property or characteristic of web – sheet or block
Patent
1980-06-18
1982-09-07
Gallagher, John J.
Stock material or miscellaneous articles
Surface property or characteristic of web, sheet or block
346 76L, 3461351, 346137, 427 531, 427166, 427255, 427264, 428426, 428688, 428913, B32B 514
Patent
active
043484611
ABSTRACT:
A recording member having a predetermined substrate, and a thin film which is formed on the substrate and which is formed with recesses or pits for recording information when irradiated with a working beam, characterized in that said thin film is formed of an inorganic material which contains at least arsenic, selenium and tellurium, and that a distribution of either of said Se and said Te decreases from a part near the surface of said thin film towards a central part thereof, while a distribution of said As increases from a part near the surface towards said central part, is disclosed. This recording member can afford a high signal-to-noise ratio and a long lifetime. It is preferable that the distribution of said Se decreases so as to be at least 50 atomic-% in terms of the content of said Se in a part being the closest to the surface of said thin film and to be at most 40 atomic-% in terms of the average content of said Se over the whole thin film, and that the distribution of said As increases so as to be at most 15 atomic-% in terms of the content of said As in the closest part and to be 5 to 35 atomic-% in terms of the average content of said As in said whole thin film. The Se-Te-As-based material may well be doped with at least one element selected from the group consisting of Ge, S, Tl, Sn, Pb, In and Ta, within a range of 2 to 15 atomic-%.
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Horigome Shinkichi
Kato Keizo
Miyamura Yoshinori
Ojima Masahiro
Shigematsu Kazuo
Gallagher John J.
Hitachi , Ltd.
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