Optical storage apparatus

Details Optical storage apparatus Optical storage apparatus

1996-12-04

1998-03-24

Edun, Muhammad N.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369116, G11B 700

Patent

active

057320551

ABSTRACT:
A light emission adjustment processing unit of a laser diode sequentially instructs a D/A converter for light emission of a light emission by test powers at two predetermined two points, allows the laser diode to emit the light, instructs a D/A converter for subtraction of subtraction currents corresponding to the test powers at two points, and measures each power by an A/D converter for monitoring. From the measurement results, a relation of the instruction values to an arbitrary power in each D/A converter is obtained by a linear approximation and registered into a power table. When deciding an optimum writing power by a test write, a limit power on the lower limit side is detected while gradually decreasing the writing power from a starting power and a predetermined offset is added to the detected limit power, thereby obtaining the optimum writing power.

REFERENCES:
patent: 5592463 (1997-01-01), Muramatsu et al.
patent: 5617401 (1997-04-01), Hurst, Jr.
patent: 5629913 (1997-05-01), Kaku et al.
patent: 5640381 (1997-06-01), Call et al.

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