Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2006-11-28
2008-09-16
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
Reexamination Certificate
active
07426170
ABSTRACT:
An objective lens according to the present invention is provided for use in an optical pickup apparatus at least reproducing and/or recording information using a light flux with a wavelength λ1emitted by a first light source for a first optical disc and reproducing and/or recording information using a light flux with a wavelength λ2emitted by a second light source for a second optical disc. The objective lens includes a diffractive structure formed on the at least one optical surface of the objective lens. The light fluxes with the wavelengths λ1and λ2enter the objective lens, an optical system magnifications m1and m2of the objective lens respectively for the light fluxes with wavelengths λ1and λ2have different signs and values from each other, and the diffractive structure has a positive diffractive action.
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Agustin Peter Vincent
Feild Joseph
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Konica Minolta Opto Inc.
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