Optical pickup and optical disk device

Details Optical pickup and optical disk device Optical pickup and optical disk device

2011-08-16

2011-08-16

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S094000, C369S112120, C369S112150, C369S120000

Reexamination Certificate

active

08000189

ABSTRACT:
An optical pickup includes: a light source that emits a light beam; an object lens that condenses the light beam on a target recording layer of an optical disk; a lens moving unit; a condensing lens; a hologram element that diffracts, in diffracting a reflected light beam and separating it into reflected zeroth-order and first-order light beams, parts of the reflected first-order light beam in a first direction and sets them as first and second beams, diffracts parts of the reflected first-order light beam in a second direction and sets them as third and fourth beams; and a photodetector that receives the first and second beams and the third and fourth beams and generates light reception signals, and receives interlayer stray light of a part of the light beam reflected by the other recording layers other than the target recording layer and generates a stray light reception signal.

REFERENCES:
patent: 2007/0291602 (2007-12-01), Nakao
patent: 2008/0084797 (2008-04-01), Sano et al.
patent: 2005-353252 (2005-12-01), None
patent: 2007-213754 (2007-08-01), None
patent: 2008/053548 (2008-05-01), None

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