Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2003-12-22
2008-10-21
Feild, Joseph (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C359S719000
Reexamination Certificate
active
07440382
ABSTRACT:
An objective optical element for use in an optical pickup apparatus comprises a first optical surface including a first diffractive structure which comprises a plurality of concentric ring-shaped diffractive zones having a center on the optical axis and stepped surfaces arranged to be almost parallel to the optical axis and connecting respective neighboring ring-shaped diffractive zones; and a second optical surface including a second diffractive structure which comprises a plurality of concentric ring-shaped diffractive zones having a center on the optical axis and stepped surfaces arranged to be almost parallel to the optical axis and connecting respective neighboring ring-shaped diffractive zones. The stepped surfaces of the first diffractive structure are arranged to face an optical axis side, and the stepped surfaces of the second diffractive structure are arranged to face an opposite side of the optical axis side.
REFERENCES:
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patent: 6313956 (2001-11-01), Saito
patent: 6952390 (2005-10-01), Mimori
patent: 2001/0038597 (2001-11-01), Shimozono
patent: 2002/0131175 (2002-09-01), Yagi et al.
Feild Joseph
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Haley Joseph
Konica Minolta Holdings Inc.
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