Optical recording medium

Details Optical recording medium Optical recording medium

1988-06-29

1990-06-19

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

430 19, 430 21, 430270, 430523, 430524, 430531, 430945, G03C 172

Patent

active

049353365

ABSTRACT:
The invention is directed to an optical recording member including a thin film photosensitive layer provided on a base. The thin film photosensitive layer may vary between a low optical density state and a high optical density state when optical energy is applied thereto. This thin film photosensitive layer contains a first element which may be a metal or semimetal, a second element which is at least one selected from Te, Ge, Sn, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Mo, Rh, Pd, Ag, Cd, In, Ta, W, Pt, Au, Tl, Pb, Si, Sb, Bi, and an oxygen element. Part of the oyxgen element is bonded with the first element to form its oxide. The ratio x of the total number of atoms of the oxygen element to that of the first element, when the maximum valence of the first element in a stable oxide state is n, is according to the relation of 0<x>n/2. At least part of the second element exists in a non-oxide state. This thin film photosensitive layer is formed by a vacuum deposition or sputtering method. By irradiating the optical recording medium with light, information may be recorded or recorded information may be erased.

REFERENCES:
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patent: 3971874 (1976-07-01), Ohta et al.
patent: 3983542 (1976-09-01), Ovshinsky
patent: 4188214 (1980-02-01), Kido et al.
patent: 4278734 (1981-07-01), Ohta et al.
patent: 4291119 (1981-09-01), Kido et al.
patent: 4587209 (1986-05-01), Ohno et al.
patent: 4636806 (1987-01-01), Natarai et al.
patent: 4637976 (1987-01-01), Teorao et al.
patent: 4710452 (1987-12-01), Raychaudhuri
patent: 4788651 (1988-11-01), Nishino et al.
European Search Report (EP 84 30 2193) citing English language Japanese abstract No. JP-A-58-54338.

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