Optical pickup and optical disk apparatus

Details Optical pickup and optical disk apparatus Optical pickup and optical disk apparatus

2011-01-04

2011-01-04

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

07864651

ABSTRACT:
An optical pickup includes: a first light source that emits a first linearly polarized light beam; a second light source that emits a second linearly polarized light beam different from the first wavelength; a drive unit configured to selectively drive the light sources; a first light path along which the first light beam travels to an optical disk; a second light path along which the second light beam travels to the optical disk, the first and second light paths intersecting in the middle of the light paths and are combined into a third light path; a light path-combining optical element provided at the intersection of the first and second light paths; a light path-separating optical element provided along the third light path; a phase difference-imparting optical element provided along the third light path; and a light receiving element that receives the first and second light beams reflected off the optical disk.

REFERENCES:
patent: 7197003 (2007-03-01), Hirai et al.
patent: 2003/0021220 (2003-01-01), Yamauchi et al.
patent: 2005/0036432 (2005-02-01), Kim et al.
patent: 2005/0111516 (2005-05-01), Hatano et al.
patent: 2003-98350 (2003-04-01), None

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