Optical pickup unit and information recording/reproduction...

Details Optical pickup unit and information recording/reproduction... Optical pickup unit and information recording/reproduction...

2006-01-31

2010-02-23

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112010, C369S112120

Reexamination Certificate

active

07668064

ABSTRACT:
According to one embodiment, an optical pickup unit which can record, reproduction and erase information in/from an information recording medium has tracks with different pitches, the dividing means has at least a part of a dividing boundary line placing between an end of a 1st order diffraction light with the largest diffraction angle and an end of a 1st order diffraction light with the smallest diffraction angle of the reflected laser beam.

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An English Translation of Notice of Reasons for Rejection mailed by the Japan Patent Office for Japanese Patent Application No. 2005-024481 on Dec. 8, 2009.

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