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. 03, 2015
Filed:
Sep. 02, 2011
Marc DE Huu, Murist, CH;
Peter Heimlicher, Fribourg, CH;
Marc De Huu, Murist, CH;
Peter Heimlicher, Fribourg, CH;
Optosys SA, , CH;
Abstract
An inductive proximity switch for detecting the presence of an object in a monitored area includes a coil (), a pulse source () for supplying the coil () with transmitting current pulses (S, S, S) at a period (T) larger than the duration (Ts) of the transmitting current pulses, and a processing circuit () for generating an output signal () based on received voltages (Ui, Ui, Ui) varying in dependence of a change of position of the object. The received voltages are induced in the coil () after the duration (Ts) of a transmitting current pulse by the decaying current which previously flows in the object due to the voltage induced therein by the coil. The proximity switch has a suppression circuit () for suppressing a signal duration lower than a predetermined perturbation time (Tc, Tc) in the output signal ().