Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2009-04-03
2011-12-13
Huber, Paul (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
08077583
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.
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Atarashi Yuichi
Kimura Tohru
Mori Nobuyoshi
Yamashita Kiyoshi
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Huber Paul
Konica Minolta Opto Inc.
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