Optical pickup device

Details Optical pickup device Optical pickup device

2005-08-30

2005-08-30

Spector, David N. (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

C369S112010, C369S112020, C369S112230

Reexamination Certificate

active

06937381

ABSTRACT:
An optical pickup device which includes (A) a light source, and (B) an objective lens and an aberration correcting optical system which are located in a light path from the light source to an optical recording medium is so arranged that the aberration correcting optical system imparts a phase distribution to luminous flux which transmits the aberration correcting optical system, so as to correct a predetermined aberration; and an amount of phase of the aberration correcting optical system when correcting the aberration is set in such a manner that the aberration correcting optical system imparts a larger amount of phase at a position farther from a point where the aberration correcting optical system crosses an optical axis of light emitted from the light source. With this, it is possible to increase a tolerance for the center misalignment of the objective lens so as to reduce aberration caused by the center misalignment.

REFERENCES:
patent: 5936923 (1999-08-01), Ootaki et al.
patent: 6084843 (2000-07-01), Abe et al.
patent: 10-123410/1998 (1998-05-01), None
patent: 10-261240 (1998-09-01), None
patent: 2001-143303 (2001-05-01), None
patent: 2001-331964 (2001-11-01), None
patent: 2002-109776 (2002-04-01), None
patent: 2002-148581 (2002-05-01), None
Takuji Nomura and Kouichi Murata “Compensation for wave front aberration using liquid crystal device with smooth index profile” (Technical Report of IEICE., CPM2000-91 (Sep. 2000), p. 1-6), (partial translation).

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