Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Ming-Shun Chang0
Date of Patent
September 13, 2016
0Patent Application Number
142614130
Date Filed
April 24, 2014
0Patent Citations Received
Patent Primary Examiner
Patent abstract
An annular optical element having a central opening includes, in order from the central opening to an outer boundary, an inner annular part, and an outer annular part connected to the inner annular part. A thickness of the annular optical element is uniform.
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