Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1994-01-10
1995-07-25
Epps, Georgia Y.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369116, 369 53, 369 4429, 369 4432, 369 4436, G11B 700
Patent
active
054368804
ABSTRACT:
The present invention provides an apparatus and method for controlling laser power in an optical recording system. A recording system in accordance with the present invention includes an optical source for supplying an incident write signal to an optical medium, such that data may be recorded on the medium during an incident write pulse as a mark having a distinct reflectivity; a detector for detecting a reflection the incident write signal from the medium to provide a reflected write signal; a generator for generating a mark formation effectiveness signal from a reflected write pulse in the reflected write signal, to provide an indication of the quality of the mark; an error signal generator for generating an error signal from the mark formation effectiveness signal and a target value of the mark formation effectiveness signal; and a controller for controlling a write power level of the optical source by providing a partial correction of variation in the error signal. The quality of data recorded in the presence of certain types of system degradations, such as laser defocus and optical media tilt, is improved. The present invention also provides techniques for determining write power control voltage and error signal voltage limits, and updating the limits using an incident write signal optical detector.
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Philips CDD521 Professional Compact Disc Recorder Service Manual, published by Service & Support Interactive Media Systems, Netherlands.
Eastman Clarke K.
Smart Gerald J.
Spyra Peter J.
Eastman Kodak Company
Edun Muhammad N.
Epps Georgia Y.
Owens Raymond L.
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