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:
Jan. 20, 1987
Filed:
Mar. 08, 1985
Kiyoshi Miyamoto, Otsu, JP;
Omron Tateisi Electronics Co., Kyoto, JP;
Abstract
A high frequency oscillation type proximity switch including an oscillating circuit having an adjusting resistor changing the oscillating state, the switch being adapted to detect an object by a decrease in the oscillation output due to the approach of the object, wherein when the oscillation output decreases, the switch detects the object while changing the resistance of the adjusting resistor to facilitate the restart of oscillation. Thus, when the object disappears after the detection of the object, oscillation is easily started, so that response to the detection of objects is improved. Further, by providing the output circuit with an integrating circuit having a time constant greater than the commercial alternating current, the oscillation is caused to be intermittent at the zero-cross point in the alternating current, thus making it possible to construct an anti-magnetic field type proximity switch which is usable even in an environment where an intense ac magnetic field is present.