Method and apparatus capable of detecting spherical...

Details Method and apparatus capable of detecting spherical... Method and apparatus capable of detecting spherical...

2006-03-30

2009-06-02

Edun, Muhammad N. (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112150, C369S110020, C369S044280

Reexamination Certificate

active

07542399

ABSTRACT:
A method capable of detecting spherical aberration caused by a storage medium includes generating a plurality of light beams having distinct phases by diffracting light emitted from a light source using a diffractive optical element, measuring optical signals of the plurality of light beams having distinct phases after being reflected by the storage medium, measuring optical signals of the plurality of light beams having distinct phases after being reflected by a reflective mirror, and updating settings of an adjusting device disposed on an optical path between the diffractive optical element and the storage medium in order to compensate for the spherical aberration caused by the storage medium.

REFERENCES:
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patent: 2003/0058770 (2003-03-01), Kuwahara et al.
patent: 2004/0017742 (2004-01-01), Iwata
patent: 2004/0047271 (2004-03-01), Mizuno
patent: 6-162552 (1994-06-01), None
patent: 2001-351255 (2001-12-01), None
patent: 2002-163830 (2002-06-01), None
patent: 2002-202450 (2002-07-01), None
patent: 2004-14039 (2004-01-01), None
patent: 200403649 (2004-03-01), None

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