Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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Filing date
Publication date
Application filed by Fujitsu LtdfiledCriticalFujitsu Ltd
Priority to JP14687278ApriorityCriticalpatent/JPS5573079A/ja
Publication of JPS5573079ApublicationCriticalpatent/JPS5573079A/ja
Publication of JPS6131465B2publicationCriticalpatent/JPS6131465B2/ja
Optical pickup device including a hologram lens section with an ellipsoidal diffraction grating pattern concentrically and symmetrically formed with respect to an optical axis