Optical pickup apparatus and focusing control method

Details Optical pickup apparatus and focusing control method Optical pickup apparatus and focusing control method

2006-03-21

2006-03-21

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044260, C369S094000

Reexamination Certificate

active

07016269

ABSTRACT:
An optical pickup apparatus having an irradiation optical system for condensing a light beam on a track of a recording plane and a photodetection optical system for guiding return light to a photodetector to detect a focal error includes a holographic lens provided in the optical path of the return light for outputting 0-th and ±1st order diffracted lights based on the return light; an optical element provided in front of or behind the holographic lens for providing astigmatism; photodetectors for receiving the 0-th and ±1st order diffracted lights; and servo-signal generating operation circuits connected to the photodetectors for generating a first and second focus error signals having a first and second capture ranges based on the output signal of the photodetector.

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patent: 6125087 (2000-09-01), Ohnishi et al.
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patent: 6292441 (2001-09-01), Yamamoto et al.
patent: 1 107 242 (2001-06-01), None
patent: 1 107 242 (2001-06-01), None

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