OPTICAL HEAD DEVICE

PROBLEM TO BE SOLVED: To provide an optical head device capable of accurately detecting a spherical aberration generated in a condensing optical system with respect to each standard, properly correcting the aberration, and properly recording/reproducing information in an optical disk in a compatible...

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Bibliographic Details
Main Author NAKAHARA HIROISA
Format Patent
LanguageEnglish
Published 10.05.2007
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:PROBLEM TO BE SOLVED: To provide an optical head device capable of accurately detecting a spherical aberration generated in a condensing optical system with respect to each standard, properly correcting the aberration, and properly recording/reproducing information in an optical disk in a compatible head equipped with objective lenses of different incident pupils corresponding to a plurality of standards. SOLUTION: The optical head device corresponding to a plurality of standards includes a plurality of areas disposed in a diffracted light optical elements to diffract lights in different directions depending on wavelengths, first to third photodetectors for receiving the diffracted lights, and a control signal generation circuit for generating a control signal to drive a beam expander lens based on the detecting results of the photodetectors. COPYRIGHT: (C)2007,JPO&INPIT
Bibliography:Application Number: JP20050302989