Optical disc drive including detection and correction of...

Details Optical disc drive including detection and correction of... Optical disc drive including detection and correction of...

2003-10-02

2008-03-25

Psitos, A M (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044410

Reexamination Certificate

active

07349298

ABSTRACT:
The optical disc drive reads and/or writes data from/on an optical disc having an information storage layer. In an optical disc drive100, light from a light source3is focused by a focusing section1, and each of the peripheral and non-peripheral part of light reflected by the information storage layer is received by a photodetector4. Then, for each part of light, the drive100generates a focus signal and a light quantity signal, and normalizes the focus signal based on the light quantity signal. As a result, it is possible to generate a spherical aberration signal according to a quantity of spherical aberration produced at the focusing position of the light. Hence, the signal is not affected by defocusing and thus it is possible to precisely detect a spherical aberration caused by an uneven thickness of the disc and to detect a spherical aberration with high accuracy.

REFERENCES:
patent: 4920527 (1990-04-01), Maeda
patent: 5774444 (1998-06-01), Shimano et al.
patent: 6229600 (2001-05-01), Martynov
patent: 6399932 (2002-06-01), Wals
patent: 6430137 (2002-08-01), Saimi et al.
patent: 6473378 (2002-10-01), Sato et al.
patent: 6498330 (2002-12-01), Yoshida
patent: 6862260 (2005-03-01), Okazaki
patent: 2001/0028614 (2001-10-01), Furukawa
patent: 2001/0040844 (2001-11-01), Sato et al.
patent: 2002/0041542 (2002-04-01), Sano et al.
patent: 2002/0048243 (2002-04-01), Yanagisawa et al.
patent: 2004/0218484 (2004-11-01), Kuze et al.
patent: 2001-307349 (2001-11-01), None
patent: 2002-039914 (2002-02-01), None
patent: 2002-039915 (2002-02-01), None
patent: 2002-055024 (2002-02-01), None

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