Touch input device having power profiling

Details Touch input device having power profiling Touch input device having power profiling

1984-06-18

1987-06-09

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

340712, 250221, G08C 900, G08C 2100

Patent

active

046723641

ABSTRACT:
An infrared touch input system having bezel glare compensation via power profiling is taught. Briefly stated, a touch input system is utilized having a four-sided frame and having an infrared transparent bezel along the inside thereof and having infrared emitters along the top and one side of the frame with infrared detectors along the sides opposite the emitters. The optical power used with emitter-detector pairs adjacent the corners of the bezel is reduced with respect to emitter-detector pairs approaching the center of the bezel. In this manner, light which is reflected after striking the side of the bezel adjacent the emitter-detector pair and which is received by the emitter is of low intensity or is ignored.

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patent: 4198623 (1980-04-01), Misek et al.
patent: 4301447 (1981-11-01), Funk et al.
patent: 4311990 (1982-01-01), Burke
patent: 4406530 (1983-09-01), Hasegawa et al.
patent: 4417824 (1983-11-01), Paterson et al.
patent: 4459476 (1984-07-01), Weissmueller et al.
patent: 4517559 (1985-05-01), Deitch et al.
John Markus-"Sourcebook of Electronic Circuits"-1968-McGraw-Hill, Inc. p. 24.

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