Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1994-01-10
1995-08-29
Epps, Georgia Y.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369116, 369 53, 369 4429, 369 4435, 369124, G11B 700
Patent
active
054467160
ABSTRACT:
The present invention provides an apparatus and method for controlling laser power in an optical recording system in the presence of multiple system degradations. 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 structure for detecting a reflection of the incident write signal from the medium to provide a reflected write signal; means 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; means for generating an error signal from the mark formation effectiveness signal and a target value of said mark formation effectiveness signal; and means for controlling a write power level of the optical source by providing a partial correction of a first type of variation in the error signal and a full correction of a second type of variation in the error signal. The first type of variations may be due to high frequency system degradations such as laser defocus and optical media tilt, while the second type of variation may be due to low frequency variations, such as changes in optical source wavelength or media sensitivity.
REFERENCES:
patent: 4239942 (1980-12-01), Van Alem et al.
patent: 4300226 (1981-11-01), Barnette et al.
patent: 4627038 (1986-12-01), Abed et al.
patent: 4755977 (1988-07-01), Abed
patent: 4779253 (1988-10-01), Getreuer et al.
patent: 4817073 (1989-03-01), Suzuki
patent: 4942567 (1990-07-01), Shiba
patent: 4965782 (1990-10-01), Mathews
patent: 4975895 (1990-12-01), Yanagi
patent: 5004311 (1991-04-01), Peppers
patent: 5020045 (1991-05-01), Smart et al.
patent: 5023854 (1991-06-01), Satoh et al.
patent: 5084849 (1992-01-01), Ishii et al.
patent: 5113384 (1992-05-01), McDonald et al.
patent: 5138593 (1992-08-01), Yokoyama
patent: 5146443 (1992-09-01), Iwase et al.
patent: 5173886 (1992-12-01), Satoh et al.
patent: 5187696 (1993-02-01), Ishii et al.
patent: 5216660 (1993-06-01), Iimura
patent: 5218588 (1993-06-01), Suzuki
patent: 5309461 (1994-05-01), Call et al.
Philips CDD521 Professional Compact Disc Recorder Service Manual, published by Service & Support Interactive Media Systems, Netherlands.
Eastman Clarke K.
Perconti James A.
Smart Gerald J.
Spyra Peter J.
Eastman Kodak Company
Edun Muhammad N.
Epps Georgia Y.
Owens Raymond L.
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