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US 7,078,674 B2Granted
Optical pickup device emitting linear polarized light with a 45 degree phase difference
AssigneeAcute Applied Technologies, Inc.
InventorJinn-Kang Wang
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Abstract
The present invention relates to an optical device which includes a first laser diode, a beam splitter, a first objective lens, a photo-detector, a second laser diode, a wedged plate beam splitter, a second objective lens and a collimator. The present invention deploys two independent transmitting paths. The retrieving paths share the beam splitter and the photo-detector commonly at the returning route.
Claims2
An optical pickup head device comprising:
- a laser diode capable of emitting linear polarized light with 45 degree phase angle difference;
- a polarized beam splitter for transforming said linear polarized light into right-hand circular polarized light and further bypassing a left-hand circular polarized light;
- a collimator for aligning said right-hand circular polarized light in parallel;
- an objective lens for focusing said right-hand circular polarized light onto an optical disk, said right-hand circular polarized light further carrying out signals from said optical disk;
- and
- a photodetector for detecting said signals.
3 more elements
Dependencies are inferred from the claim text.