Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2004-04-19
2008-08-12
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
C369S112070
Reexamination Certificate
active
07411883
ABSTRACT:
An optical pickup apparatus includes first and second light sources; an objective lens; a spherical aberration correcting optical unit; and a chromatic aberration correcting optical element which includes a diffractive surface on at least one optical surface of the chromatic aberration correcting optical element such that a diffractive structure which is constructed by a plurality of ring-shaped zones separated by fine steps is formed on the diffractive surface, wherein the depth of steps along an optical axis is designed so that n2, which is a diffraction order of a diffracted ray having a largest diffraction efficiency among diffracted rays caused when the second light flux enters into the diffractive structure, is a lower order than n1, which is a diffraction order of a diffracted ray having a largest diffraction efficiency among diffracted light rays caused when the second first light flux enters into the diffractive structure.
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Kimura Tohru
Mori Nobuyoshi
Danielsen Nathan
Feild Joseph
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Konica Minolta Opto Inc.
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