Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
March 3, 2009
Patent Application Number
11856865
Date Filed
September 18, 2007
Patent Primary Examiner
Patent abstract
A keypad is provided. The keypad includes an optical waveguide on the top surface of which at least one prism pattern is formed, a light source for generating light and causing the light to be incident to a side surface of the optical waveguide, and at least one optical detector located below the optical waveguide to correspond to the at least one prism pattern.
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