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Apparatus and method for inputing data










Image Number 4 for United States Patent #6281878.

An input device for detecting input with respect to a reference plane. The input device includes a light sensor positioned to sense light at an acute angle with respect to the reference plane and for generating a signal indicative of sensed light, and a circuit responsive to said light sensor for determining a position of an object with respect to the reference plane.








 
 
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