Optical element, optical pickup device comprising the same,...

Details Optical element, optical pickup device comprising the same,... Optical element, optical pickup device comprising the same,...

2011-06-28

2011-06-28

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112030, C369S112060, C369S112070

Reexamination Certificate

active

07969850

ABSTRACT:
The optical element comprises a first diffraction structure for generating three beams by diffracting light from a light source and a second diffraction structure that exhibits structural birefringence for a prescribed polarized light returning to the light source. The first diffraction structure is formed on a first face of a translucent optical base material and the second diffraction structure is formed on a second face of the optical base material. The optical base material, the first diffraction structure and the second diffraction structure are formed of a single material.

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patent: 7453643 (2008-11-01), Kleemann
patent: 2002/0003661 (2002-01-01), Nakai
patent: 2005/0195485 (2005-09-01), Hirai et al.
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patent: 2001-343512 (2001-12-01), None
patent: 2002-170272 (2002-06-01), None
patent: 2003-185818 (2003-07-01), None
patent: WO 2004102233 (2004-11-01), None

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