Optical pickup

Details Optical pickup Optical pickup

2011-03-01

2011-03-01

Ortiz Criado, Jorge L (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044280, C369S112030

Reexamination Certificate

active

07898926

ABSTRACT:
The liquid crystal element includes a pair of transparent substrates, a liquid crystal arranged between the substrates, a diffraction pattern including concentric diffraction electrodes formed on one substrate, and a phase shift pattern including concentric phase shift electrodes formed on the other substrate. The diffraction pattern includes a first region being of a constant range in a radial direction from a center and having a wide electrode interval, a second region being arranged on the outer side of the first region and having a narrow electrode interval, and a third region being arranged on the outer side of the second region and including a single diffraction electrode. An additional electrode facing the phase shift electrode is arranged in a gap between the diffraction electrodes in the first region.

REFERENCES:
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patent: 2006-286028 (2006-10-01), None
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Patent Abstracts of Japan for Japanese Publication No. 2005-202323, Publication date Jul. 28, 2005 (2 pages).
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Patent Abstracts of Japan for Japanese Publication No. 2004-178773, Publication date Jun. 24, 2004 (2 pages).
Extended European Search Report for European Application No. 08000859.2-1232, mailed on Jun. 11, 2008 (8 pages).

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