Optical pickup device with focus error detecting optical...

Details Optical pickup device with focus error detecting optical... Optical pickup device with focus error detecting optical...

2005-11-22

2005-11-22

Patel, Gautam R. (Department: 2655)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044230, C369S044370, C369S044410, C369S112170, C369S124120

Reexamination Certificate

active

06967908

ABSTRACT:
An optical pickup device for focusing a light beam includes a focus error detecting optical element which splits and leads return light to a photodetector. The focus error detecting element has an area quadrisected by two division lines defining a plane substantially perpendicular to the optical path of the return light for applying astigmatism to the return light in directions rotated by 90° from each other and for separating the return light into at least four by the respective quadrants. The photodetector has a plurality of spaced light receiving elements for receiving the separated return light, each receiving element has contour lines corresponding to the division lines on an image plane on which a light beam is shaped into a circular beam. The light receiving elements are comprised of two light receiving areas divided by a bisect line extending substantially in parallel with one of the contour lines.

REFERENCES:
patent: 4464741 (1984-08-01), Compaan
patent: 4793696 (1988-12-01), Suh
patent: 4794580 (1988-12-01), Ikedo et al.
patent: 4815027 (1989-03-01), Tokumitsu et al.
patent: 4847478 (1989-07-01), Sugiura
patent: 4959824 (1990-09-01), Ueda et al.
patent: 5331622 (1994-07-01), Ernst et al.
patent: 5359184 (1994-10-01), Froehlich et al.
patent: 5963316 (1999-10-01), Miura et al.
patent: 6057953 (2000-05-01), Ang
patent: 6212150 (2001-04-01), Inoue et al.
patent: 6418098 (2002-07-01), Yamamoto et al.
patent: 6445668 (2002-09-01), Sugiura et al.
patent: 6584060 (2003-06-01), Oohchida et al.
patent: 8-185635 (1996-07-01), None

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