System and method of determining a position of a radiation...

Details System and method of determining a position of a radiation... System and method of determining a position of a radiation...

2004-09-09

2008-10-28

Lee, John R (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S222100, C345S176000

Reexamination Certificate

active

07442914

ABSTRACT:
A method and a system for determining the position of a radiation emitter, which radiation emitter may be an actively radiation emitting stylus, pen, pointer, or the like or may be a passive, radiation scattering/reflecting/diffusing element, such as a pen, pointer, or a finger of an operator. The radiation from the emitter is reflected from that position toward the detector by a reflecting element providing multiple intensity spots on the detector providing sufficient information for determining the position. From the output of the detector, the position of the radiation emitter is determined.

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Joseph A. Paradiso, “Several Sensor Approaches that Retrofit Large Surfaces for Interactivity,” ACM Ubicomp 2002 Workshop on Collaboration with Interactive Walls and Tables, Gothenburg, Sweden, Sep. 29, 2002.

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