Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
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
Kikuhara Hajime
Kobayashi Kazumi
Feild Joseph H
Lee Nicholas
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Sony Corporation
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