Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1993-02-10
1994-08-09
Hannaher, Constantine
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 59, G11B 7085
Patent
active
053373057
ABSTRACT:
An information storage system for recording and reproducing information by use of irradiating light on a medium capable of overwriting information is provided. The information storage system is capable of recording information even if the light intensity is varied so as to enhance reliability. The intensity of the light at the time of overwriting is modulated, the more intense light intensity being P.sub.H and the less intense light intensity being P.sub.L. The system includes a mechanism to keep relationship of P.sub.H +.alpha.P.sub.L equal to a constant (.alpha. being a constant depending on the recording conditions). The laser drive circuit is so adjusted that P.sub.H and P.sub.L always provide an optimal condition even if P.sub.H and/or P.sub.L vary. Thus recording can always be performed under optimal conditions to enhance the reliability of the information storage system to expand the power margin of a recording medium and to increase the percentage yield of information medium.
REFERENCES:
patent: 5067122 (1991-11-01), McGee
J. Magn. Soc. Jpn. vol. 15 1991 pp. 293-298.
Jpn. J. Appl. Phys. vol. 31 (1992), pp. 411-413, Part I, No. 2B Feb. 1992.
J. Magn. Soc. Jpn., vol. 15, Supplement No. S1 (1991) pp. 447-448.
Fujii Yoshio
Fukami Tatsuya
Hashima Kazuo
Kawano Yuji
Nakaki Yoshiyuki
Hannaher Constantine
Mitsubishi Denki & Kabushiki Kaisha
Wong Don
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