Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
November 20, 2007
Patent Application Number
10737103
Date Filed
December 15, 2003
Patent Primary Examiner
Patent abstract
An optical pickup in an optical disk reproducing device is operable to switch operations between a low-power operation mode and a high-power operation mode, and includes a liquid crystal element and a polarization beam splitter, which together attenuate, only in the low-power operation mode, a laser beam emitted by a laser diode onto an optical disk. The liquid crystal element is turned ON only in the low-power operation mode to serve as a polarization rotating element. Working with the polarization beam splitter, the polarization rotating element attenuates a polarized component of the incident light on the optical disk.
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