Method and apparatus for recording and reproducing information o

Details Method and apparatus for recording and reproducing information o Method and apparatus for recording and reproducing information o

1979-08-24

1982-03-30

Moffitt, James W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369284, 369288, 346 76L, 365113, G11B 700

Patent

active

043228399

ABSTRACT:
The optical density and/or the reflectivity of a recording layer included in an optical disk is selectively changed to record information by irradiation with a semiconductor laser beam, while the recording layer may be covered with a suitable protective film. The thickness of the recording layer is so determined that it is able to record information by means of a continuous wave type semiconductor laser beam, while the optical absorption rate of the recording layer is adjusted by setting the percentages of particular additives. The recorded information may be reproduced by the application of a laser beam, the incident power of which is lower than that of the recording beam, to detect the reflected light.

REFERENCES:
patent: 3430966 (1969-03-01), Gregg
patent: 3801966 (1974-04-01), Terao
patent: 3829622 (1974-08-01), Elliot
patent: 3866238 (1975-02-01), Monroe
patent: 3868651 (1975-02-01), Ovshinsky
patent: 3971874 (1976-07-01), Ohta
patent: 3983317 (1976-09-01), Gloriosa
patent: 4038663 (1977-07-01), Day
patent: 4085423 (1978-04-01), Tsumada
patent: 4118734 (1978-10-01), Bouwhuis
patent: 4125860 (1978-11-01), Ishii
patent: 4183094 (1980-01-01), Keeyer
Electronics; 11/23/78; pp. 75, 76.

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