Optical pickup reducing noise and polarization changer

Details Optical pickup reducing noise and polarization changer Optical pickup reducing noise and polarization changer

2003-11-12

2008-08-26

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S110040, C369S110010, C369S112160, C369S112190

Reexamination Certificate

active

07417936

ABSTRACT:
An optical pickup includes a laser light source, an objective lens which focuses light emitted from the laser light source on an optical information storing medium, an optical path changer which changes a proceeding path of the light emitted from the laser light source, a polarization changer which changes the polarization of an incident light to make the polarization of light reflected by the optical information storing medium and reentering the laser light source different from that of the light emitted from the laser light source, so that noise generated due to interference by the light reflected by the optical information storing medium and reentering the laser light source is reduced, and a photodetector which receives incident light reflected by the optical information storing medium and sequentially passing through the objective lens and the optical path changer and detects an information signal and/or an error signal.

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Office Action issued for related Korean Application No. 2002-70456 dated Aug. 27, 2004.

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