Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Russell W. Gruhlke0
Date of Patent
February 15, 2011
Patent Application Number
11242558
Date Filed
October 3, 2005
Patent Citations Received
Patent Primary Examiner
Patent abstract
One embodiment of the invention is a user input system for a hand held computing device that comprises a movable piece with a reflective side, an optical cavity adjacent to said movable piece, a light emitting source positioned within the cavity such that emitted light is incident on to the reflective side of the movable piece, and a sensor positioned within the cavity to receive light reflected from the reflective side.
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