Optical pickup using a wedge type beam splitter

Details Optical pickup using a wedge type beam splitter Optical pickup using a wedge type beam splitter

2007-01-16

2007-01-16

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112010

Reexamination Certificate

active

10751114

ABSTRACT:
A compatible type optical pickup using a wedge type beam splitter that can record and/or reproduce information on/from optical recording media having different formats. The compatible type optical pickup includes: a first light source that generates and emits a first light beam of a predetermined wavelength; a second light source that generates and emits a second light beam having a different wavelength from that of the first light beam; a wedge type beam splitter disposed in an optical path between the first and second light sources, which changes the traveling paths of the first and second light beams to allow the first and second light beams to travel along the same optical path and minimizes aberrations; a main beam splitter disposed in an optical path between the wedge type beam splitter and an optical recording medium, which changes the traveling paths of incident light beams; an objective lens that focuses the first and second light beams entered via the main beam splitter onto the optical recording medium; and a main photodetector that receives the first and second light beams reflected from the optical recording medium detects an information signal and an error signal.

REFERENCES:
patent: 7079468 (2006-07-01), Worthington et al.
patent: 2001-43553 (2001-02-01), None
patent: 2001-167467 (2001-06-01), None
patent: 2002-237082 (2002-08-01), None
patent: 1999-83967 (1999-12-01), None
Notice of Office Action issued by Korean Patent Office, on Oct. 27, 2004, for a corresponding Korean Patent Appliction 2003-438.

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