Reversible optical information recording medium

Details Reversible optical information recording medium Reversible optical information recording medium

1985-06-12

1987-04-07

Herbert, Thomas J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

346 76L, 3461351, 346137, 428412, 428432, 428461, 428463, 428913, 430945, B32B 1504, G01D 1514, G01D 1534

Patent

active

046560793

ABSTRACT:
A reversible optical information recording medium which permits recording, reproducing, erasing and rewriting at high speeds by means of laser beams. The reversible optical information recording medium has a recording thin film which is essentially constituted by Te-Au-O, and Ge or Se. In the system which employs Ge, the recording thin film is formed by addition of at least one selected from a group consisting of Sn, In, Bi and Sb, such as to reduce the Au content in the film composition. On the other hand, in the system which employs Se, a further improvement in the stability of the recorded signal is achievable by the addition of Ge, and an improvement in the recording/erasing sensitivities, particularly erasing sensitivity, can be enhanced by addition of at least one element selected from a group consisting of Sn, In, Bi and Sb. The recording/erasing mechanism in the reversible optical information recording medium of the invention mainly relies upon a change in the optical characteristic which in turn is caused mainly by a reversible phase change of Te. The phase change in the recording medium of the invention can be effected by a laser beam of an extremely low light power density and short irradiation time as compared with that required by the conventional optical information recording medium. This in turn permits much higher speed of recording and erasing of information over the conventional optical information recording medium.

REFERENCES:
patent: 3530441 (1970-09-01), Ovshinsky
patent: 3971874 (1976-07-01), Ohta et al.
patent: 4278734 (1981-07-01), Ohta et al.
patent: 4278758 (1981-07-01), Drexler et al.
patent: 4461807 (1984-07-01), Mori et al.
patent: 4587209 (1986-05-01), Ohno et al.

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