Optically modulated overwritable recording device

Details Optically modulated overwritable recording device Optically modulated overwritable recording device

1993-03-03

1995-12-12

Epps, Georgia Y.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 73, 369116, G11B 700

Patent

active

054756669

ABSTRACT:
A recording device for recording information upon optically modulated overwritable magneto-optical recording medium including four magnetic layers first records DC "1" and then a test signal at high and low recording laser power levels upon a test track of the recording medium. The high and low recording laser power levels are successively modified to scan a two-dimensional region of the high and low recording laser power levels, and the optimal high and low recording laser power levels are determined on the basis of the reproduction signal levels corresponding to respective combination of high and low recording laser power levers. The reproduction signal levels are represented upon the .alpha.-K plane which is divided into six characteristic regions, The optimal combination of high and low recording laser power levels is determined as a representative point within the region of correct reproduction with a predetermined allowance.

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B. Bartholomeusz et al., "Influence of Laser Read and Bias Power Levels on the Performance of Thermomagnetooptic Recording Media", Applied Optics, vol. 29, No. 20, pp. 3030-3039, Jul. 10, 1990.

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