Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
April 29, 2008
Patent Application Number
11236829
Date Filed
September 28, 2005
Patent Primary Examiner
Patent abstract
An object is to provide an aspherical lens having compactness in dimension, large degree of freedom in design, and good optical performance, with increasing in productivity, and lowering production cost. The aspherical lens constructed by a substrate member A and a member B having different composition formed on the substrate member A. A boundary between the substrate member A and the member B having different composition is formed by a first aspherical surface RAB, and a surface of the member B having different composition opposite to the boundary being formed by a second aspherical surface RB having higher fabrication accuracy than that of the first aspherical surface RAB, and given conditional expressions are satisfied.
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