Method and apparatus for changing laser beam power of an optical

Details Method and apparatus for changing laser beam power of an optical Method and apparatus for changing laser beam power of an optical

1997-09-29

1999-11-23

Edun, Muhammad

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 58, 369116, G11B 700

Patent

active

059912510

ABSTRACT:
A layer beam controller for an optical storage apparatus includes a laser beam generator, a laser beam power varier for varying the laser beam power to first, second, and third power levels, a memory for storing predetermined reference values including first reference values corresponding to the first power level and second reference values corresponding to the second power level, a light amount detector for detecting a light amount of the laser beam, a laser beam power corrector for correcting the laser beam power at the respective power level by comparing the light amount and a corresponding one of the predetermined reference values selected by a type of the compact disk in operation in the optical storage apparatus. The laser beam controller further includes a power level assigner for assigning the first, second and third power levels based on the type of disk.

REFERENCES:
patent: 5544137 (1996-08-01), Ohara et al.
patent: 5706271 (1998-01-01), Hashimote
patent: 5724328 (1998-03-01), Yanagi

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