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:
Jul. 10, 1990
Filed:
Aug. 15, 1989
Shoichi Ono, Suwa-shi, Nagano-ken, JP;
Atsuhito Kobayashi, Okaya-shi, Nagano-ken, JP;
Other;
Abstract
An alignment system for photoelectric switch includes a variable frequency oscillator producing a frequency which varies according to a light reception signal from a light receiving element in the photoelectric switch. A light emitting device is energized by the output of the variable frequency oscillator to give a visual indication of alignment. A threshold compares the amplitude of the light reception signal with a preset voltage. When the light reception signal exceeds the preset voltage, a logic element provide steady illumination of the light emitting device as an indication that alignment is completed. A lower threshold is then applied to the threshold to keep the light emitting device steadily illuminated until misalignment or propagation conditions reduce the amount of light received.