OPTICAL DISK DRIVE AND LASER POWER CONTROL METHOD

According to one embodiment, an optical disk drive includes a monitor diode which monitors a laser output of a laser diode irradiating a laser beam to an optical disk, a detector which sets an output termination mode when a state that a monitor signal obtained from the monitor diode exceeds a first...

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Bibliographic Details
Main Author NAKANE HIROSHI
Format Patent
LanguageEnglish
Published 02.04.2009
Subjects
BASIC ELECTRIC ELEMENTS
DEVICES USING STIMULATED EMISSION
ELECTRICITY
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Summary:According to one embodiment, an optical disk drive includes a monitor diode which monitors a laser output of a laser diode irradiating a laser beam to an optical disk, a detector which sets an output termination mode when a state that a monitor signal obtained from the monitor diode exceeds a first reference value continues over a predetermined period is detected from a deglitch, a switch section which terminates the laser output of the laser diode upon setting of the output termination mode, and a controller which supplying a drive signal for reducing a difference obtained as a comparison result between the monitor signal and a second reference value smaller than the first reference value. The controller serves as a software-based digital filter which realizes an equalizer function of making phase compensation of the comparison result.
Bibliography:Application Number: US20080238005