|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||250/221 ; 250/2221|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 33 인용 특허 : 6|
An opto-matrix touch input device which samples and compares beam readings is taught. Briefly stated, phototransistor readings which sample ambient light as well as light from an associated light emitting diode are compared with preset values. If the readings from the phototransistor are below a certain level, then the phototransistor/LED pair are flagged as bad. If the readings are within preset limits, yet below nominal values, then the phototransistor/LED pair are flagged as indicating a marginal beam. In this manner a trouble report may be generated ...
An opto-matrix touch input device comprising: a four-sided frame; optical emitters disposed in two adjacent sides of said frame; optical detectors disposed in the two sides of said frame opposite said emiters, corresponding emitters and detectors forming an emitter detector pair; sequencing means for sequentially activating said optical emitters and associated optical detectors; means for sampling the amount of light received by said detectors and producing an analog electrical signal indicative of the amount of light received by the detectors; converter...