Data readout method, data readout device, and optical disk

A data readout method is disclosed that is able to read data from an optical disk (15) capable of super resolution readout with high accuracy. The data recorded in an optical disk (15) by irradiating a laser beam onto the optical disk (15). The method includes the steps of varying a light emission p...

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Bibliographic Details
Main Authors YOKOI KENYA, KASAHARA RYOSUKE
Format Patent
LanguageChinese
English
Published 30.01.2008
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:A data readout method is disclosed that is able to read data from an optical disk (15) capable of super resolution readout with high accuracy. The data recorded in an optical disk (15) by irradiating a laser beam onto the optical disk (15). The method includes the steps of varying a light emission power level of the laser beam while the laser beam is irradiated onto the optical disk (15), and acquiring a reflectivity of the optical disk (15), and acquiring a reflectivity of the optical disk (15) corresponding you each light emission power level; calculating a second derivative of a curve representing correlation between the reflectivity and the light emission power with respect to the light emission power with respect to he light emission power; calculating an extreme value of the second derivative; and calculating an optimum readout power level for super resolution readout based on the extreme value.
Bibliography:Application Number: CN200710138151