Optical information apparatus and method of recording and erasin

Details Optical information apparatus and method of recording and erasin Optical information apparatus and method of recording and erasin

1985-11-06

1988-01-05

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369100, 369284, 369286, 369 94, 346 76L, 3461351, G11B 7095, G11B 724

Patent

active

047180536

ABSTRACT:
The present invention employs as a recording medium a metal or alloy which exhibits an intercrystalline transition before and after writing. In the present invention, two light beams of unequal wavelengths are used so as to write information with the light beam of the longer wavelength and to erase information with the light beam of the shorter wavelength. In changing a written content, a wavelength with which the reflection rate of the recording medium increases is used.

REFERENCES:
patent: 3530441 (1970-09-01), Ovskinsky
patent: 3889272 (1975-06-01), Lou
patent: 4394661 (1983-07-01), Peeters
patent: 4564931 (1986-01-01), Ohara
patent: 4566088 (1986-01-01), Yoshida
patent: 4578788 (1986-03-01), Ahn

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