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:
Apr. 23, 1985
Filed:
Dec. 01, 1982
Kiyoshi Miyamoto, Nagaokakyo, JP;
Kenji Ueda, Otsu, JP;
Omron Tateisi Electronics Co., Kyoto, JP;
Abstract
A proximity switch comprising a detection coil, a first capacitor connected in parallel with the detection coil for forming a resonant circuit, an auxiliary coil, a second capacitor connected in parallel with the auxiliary coil for forming a resonant circuit, an oscillation circuit connected to the detection and auxiliary coils which are connected in series and in reverse winding directions, and an output circuit connected to the oscillation circuit for receiving variations in output generated from the oscillation circuit, the second capacitor having a capacitance larger than that of the first capacitor so that the second capacitor has a reduced low impedance at an oscillation frequency determined by the detection coil and the first capacitor.