Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1994-11-17
1996-10-22
Epps, Georgia Y.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
372 38, G11B 700, H01S 3133
Patent
active
055684645
ABSTRACT:
A semiconductor laser driving apparatus for use in an information recording/reproducing apparatus that records and reproduces information by illuminating a medium with a laser beam. The semiconductor laser driving apparatus includes a semiconductor laser for generating the laser beam, a photo detector for detecting the output of the semiconductor laser, a first current source for generating a base optical power of the output of the semiconductor laser wherein the base optical power is used in recording information, a second current source for adjusting a reproducing optical power of the output of the semiconductor laser wherein the reproducing optical power is used to reproduce information, a third current source for adjusting a recording optical power of the output of the semiconductor laser wherein the recording optical power is used in recording information, and an optical power control circuit for controlling the optical output power of the semiconductor laser in such a manner that the reproducing optical power used to reproduce information is generated by the sum of a current provided by the first current source and a current provided by the second current source, the recording optical power used to record information is generated by the sum of the current provided by the first current source and a current provided by the third current source, and the base optical power used to record information is generated by the current provided by the first current source.
REFERENCES:
patent: 4855988 (1989-08-01), Shinbayashi et al.
patent: 4912714 (1990-03-01), Hatanaka et al.
patent: 5175722 (1992-12-01), Minami et al.
patent: 5224112 (1993-06-01), Uesaka
patent: 5276671 (1994-01-01), Minami et al.
patent: 5400313 (1995-03-01), Belser et al.
patent: 5513197 (1996-04-01), Koishi
Chu Kim-Kwok
Epps Georgia Y.
Olympus Optical Co,. Ltd.
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