The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 1987
Filed:
Oct. 31, 1984
Arthur B Carroll, Georgetown, TX (US);
John K Carstedt, Round Rock, TX (US);
Carroll Touch, Inc., Round Rock, TX (US);
Abstract
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 for the purpose of repair or investigation as well as providing a vehicle for keeping a history of the opto-matrix frame condition and thereby a method of early fault detection.