Optical pickup and optical pickup aberration correcting method

Details Optical pickup and optical pickup aberration correcting method Optical pickup and optical pickup aberration correcting method

2008-07-02

2010-10-12

Haley, Joseph (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112020, C369S112240, C369S112290

Reexamination Certificate

active

07813234

ABSTRACT:
An optical pickup includes: a spherical aberration correcting portion for correcting spherical aberration by adjusting a convergence/divergence state of laser light emitted from a light source; a reflecting portion having: a first surface that chooses whether or not to pass laser light emitted from the spherical aberration correcting portion according to the wavelength of the laser light; and a second surface that reflects laser light that has passed through the first surface; and two objective lenses that are selectively used according to whether laser light reflected from the reflecting portion has been reflected by the first surface or by the second surface so as to condense light reflected from the reflecting portion onto a recording layer of an optical disc. Here, between the spherical aberration correcting portion and the objective lenses, there is disposed an astigmatism correcting portion that is formed such that the amount of correction can be changed.

REFERENCES:
patent: 7130134 (2006-10-01), Hendriks
patent: 2004/0017763 (2004-01-01), Tawa et al.
patent: 2007/0268806 (2007-11-01), Yamasaki et al.
patent: 2009/0213706 (2009-08-01), Hotta et al.
patent: 2005-196859 (2005-07-01), None
patent: 2007-052864 (2007-03-01), None

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