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:
Jun. 15, 1993
Filed:
Jun. 24, 1991
David E Harris, Powell, OH (US);
Harris Instrument Corporation, Columbus, OH (US);
Abstract
Method and apparatus are provided of a variety wherein a linear array of light emitting diodes (LEDs) are positioned at one side of a material having an edge to be detected. A photoresponsive receiver is positioned on the opposite side of the material at a predetermined stand-off distance from the LED array. The visual LEDs of the array are energized by a drive current which is pre-selected such that light emitting from each exhibits substantially uniform intensity at the photodetecting receiver when non-attenuated by the material. Additionally, the photodetector at the receiver is configured having a length of at least 6 cm to substantially improve edge related data collection. The improvements provide for substantially enhanced measurement accuracy and permit the detection of edges of transparent and semi-transparent materials.