Apparatus and method for compensating wobble in holographic...

Details Apparatus and method for compensating wobble in holographic... Apparatus and method for compensating wobble in holographic...

2006-09-26

2006-09-26

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

Reexamination Certificate

active

07113464

ABSTRACT:
A holographic digital data storage apparatus detects a wobbling in a disc shaped storage medium, wherein the apparatus includes a beam generator and finding means, the disc including therein one or more holographically generated patterns. The beam generator projects at least two wobble detection beams to the holographically generated patterns, the wobble detection beams having different diffraction efficiencies provided at respective characteristic angles, wherein the characteristic angle is an angle between an optical path of one wobble detection beam and that of its corresponding pattern forming beam used in forming one of the holographically generated patterns and a diffraction efficiency is given by a ratio of a power of a diffracted beam of one of the wobble detection beams to a power of said one of the wobble detection beams. The finding means finds at least a difference between the diffraction efficiencies to thereby determine the wobbling in the disc.

REFERENCES:
patent: 5798851 (1998-08-01), Tachihara et al.
patent: 5982513 (1999-11-01), Zhou et al.
patent: 6956681 (2005-10-01), Anderson
patent: 2002/0041561 (2002-04-01), Tsukamoto et al.

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