Optical pickup device and optical disc device

Details Optical pickup device and optical disc device Optical pickup device and optical disc device

2010-07-27

2011-10-18

Feild, Joseph (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112120, C369S112150

Reexamination Certificate

active

08040779

ABSTRACT:
An optical pickup device includes an astigmatism element which sets focal line positions to be defined by convergence of laser light away from each other, a diffraction element which diffracts four light fluxes obtained by a light flux of the laser light to disperse the four light fluxes from each other, and a photodetector having a first sensing section and a second sensing section which respectively receive m-th order diffraction light and n-th order diffraction light of the four light fluxes. In this arrangement, the first sensing section receives eight light fluxes obtained by dividing the four light fluxes of the m-th order diffraction light by two straight lines to output detection signals of the number less than eight.

REFERENCES:
patent: 2007/0104072 (2007-05-01), Ogata
patent: 2007/0268807 (2007-11-01), Kimura et al.
patent: 2008/0094948 (2008-04-01), Kamisada et al.
patent: 2008/0137513 (2008-06-01), Mori et al.
patent: 2008/0267019 (2008-10-01), Kimura et al.
patent: 2009/0225645 (2009-09-01), Nagatomi
patent: 2006-252716 (2006-09-01), None
patent: 2006-260669 (2006-09-01), None
patent: 2008-171470 (2008-07-01), None
Explanation of Circumstances filed in the corresponding Japanese Application No. 2009-178709, filed Dec. 21, 2010, pp. 1-11, Japan.

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