Koninklijke Philips Corporation N.v.

Lite-on It Corporation

Edwin Johannes Maria Janssen

Johannes Leopoldus Bakx

Pieter Hoeven

Hendrikus Albertus Johanna Looijmans

A method for monitoring an optical disk drive performance quality by determining a laser diode quality indicator for a laser diode arranged in an optical disk drive for scanning an optical disk, includes measuring an actual value of a parameter associated with a laser diode characteristic, obtaining a reference value of the parameter, comparing the actual value with the reference value for obtaining a comparison result, and determining the laser diode quality indicator from the comparison result. The laser diode quality indicator can at least take a warning level signaling a precursor for a defective state of the optical disk drive and an error level signaling a defective state of the optical disk drive. The laser diode characteristic may be a light-current or a voltage-current relationship.

Method for monitoring an optical disk drive performance quality, optical disk drive, optical disk duplicator system and computer program product

A method and system are provided for minimizing or optimising radial to vertical crosstalk (RVC) in an error signal in an optical record carrier reader is record carrier losed. Focus error offset values are applied to the reader. The radial to vertical crosstalk is determined after each focus error offset value is applied. The focus error offset value which minimizes or optimises the radial to vertical crosstalk is selected for use by the reader.

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Eindhoven, Netherlands

Edwin Johannes Maria Janssen