Optical pickup apparatus

Details Optical pickup apparatus Optical pickup apparatus

2009-10-19

2011-11-15

Lamb, Christopher R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112120, C369S044410

Reexamination Certificate

active

08059515

ABSTRACT:
Provided is an optical pickup apparatus that can be made compact and is capable of producing stable push-pull signals. The optical pickup apparatus includes a light source, an objective lens, a diffraction element, a light-receiving element, and a control-driving section. The diffraction element receives light reflected from an optical recording medium. The light-receiving element receives light beams diffracted by the diffraction element. The light-receiving element has a plurality of light-receiving regions. The light-receiving region produces an output signal responsive to the quantity of the incident light beam. The control-driving section obtains differences among the output signals from a plurality of the light-receiving regions by calculation to derive a push-pull signal, and drives the objective lens under control on the basis of the push-pull signal.

REFERENCES:
patent: 5608695 (1997-03-01), Yamazaki
patent: 6185167 (2001-02-01), Arai et al.
patent: 6418107 (2002-07-01), Sano et al.
patent: 2005/0002313 (2005-01-01), Hayashi
patent: 2005/0105182 (2005-05-01), Kato et al.
patent: 11-73658 (1999-03-01), None

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