Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Seong-su Park0
Bong-gi Kim0
Jung-woo Hong0
Date of Patent
January 5, 2010
0Patent Application Number
112547000
Date Filed
October 21, 2005
0Patent Primary Examiner
Patent abstract
A diffraction element for an optical pick-up apparatus is capable of precisely controlling the tracking of the pick-up apparatus. The diffraction element includes a diffraction grating divided into a first, a second, and a third region. The second region is located between the first and third regions. Any one of the first region and the third region is inclined at a predetermined angle θ with respect to the second region.
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