Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1990-07-09
1992-07-28
Envall, Jr., Roy N.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 54, 369 56, 369 48, G11B 700
Patent
active
051346060
ABSTRACT:
An apparatus and method for recording and reproducing information onto or from a rotating magnetooptic disc such that optimal laser power is maintained throughout the recording process. A test recording laser beam undergoes stepwise power changes as the recording position along a track of the disc changes. The recording signal is read out by a reproducing mechanism corresponding to the stepwise power change. A correcting mechanism utilizes the read-out signal to obtain the optimal power of the recording laser beam. Then, routine recording is carried out utilizing the optimal laser power. As routine recording is carried out, the optimal laser power is corrected depending upon the radial distance of the track being recorded from the center of the disc. As a result, optimal laser power is maintained regardless of the track position on the magnetooptic disc.
REFERENCES:
patent: 4769802 (1988-09-01), Tatsduguchi
patent: 4866692 (1989-09-01), Saito et al.
patent: 4982389 (1991-01-01), Nakao et al.
patent: 4982397 (1991-01-01), Yokota
patent: 5005164 (1991-04-01), Sakamoto et al.
Sasaki Yoshihiro
Sekiguchi Toru
Envall Jr. Roy N.
NEC Corporation
Tran Thang V.
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