Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Naoyuki Takagi0
Katsutoshi Hibino0
Kazushi Mori0
Date of Patent
January 25, 2011
0Patent Application Number
119456730
Date Filed
November 27, 2007
0Patent Primary Examiner
Patent abstract
An optical element is disposed on an optical path between a beam branching element and a photodetector. The optical element is disposed at a focal position of a stray light beam reflected by a recording layer except a target recording layer, and shields or attenuates the light beam in a region where the stray light beam converges.
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