Method and apparatus for controlling laser beam power in an...

Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval

Reexamination Certificate

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C369S053300

Reexamination Certificate

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07092338

ABSTRACT:
In a method and apparatus for controlling the power of a laser beam in an optical recording system that includes a laser light source, an optical detector detects a reflected write pulse that is a reflection of an incident recording light signal from the optical recording medium, and a signal generating device generates a mark formation effectiveness (MFE) signal according to the reflected write pulse. A laser power compensation circuit includes a filter for filtering the MFE signal so as to result in a first component, and a combiner for combining the first component and the MFE signal so as to result in a second component. The laser power compensation circuit controls laser beam power of the laser light source according to the first and second components for optimum information recording.

REFERENCES:
patent: 5436880 (1995-07-01), Eastman et al.
patent: 5446716 (1995-08-01), Eastman et al.
patent: 5675568 (1997-10-01), Hajjar et al.
patent: 6052347 (2000-04-01), Miyata
patent: 6418102 (2002-07-01), Suga

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