Optical element, aberration correcting element, light...

Details Optical element, aberration correcting element, light... Optical element, aberration correcting element, light...

2008-05-06

2008-05-06

Huber, Paul W. (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S121000

Reexamination Certificate

active

10866902

ABSTRACT:
An optical system for use in an optical pickup apparatus comprises a first optical surface having a superposition type diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each ring-shaped zone is composed of a plurality of stepped sections stepwise, and a second optical surface having a diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each of the plurality of ring-shaped zones are divided by a stepped section to generate a diffractive light ray of diffractive order whose absolute value is not small than 1 for the light flux.

REFERENCES:
patent: 2003/0058776 (2003-03-01), Sakamoto
patent: 2003/0185134 (2003-10-01), Kimura et al.
patent: 2003/0202451 (2003-10-01), Kimura et al.

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