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:
Dec. 20, 1988
Filed:
Oct. 21, 1986
Heinz Walker, K/u/ mmersbruck, DE;
Hans-Dieter Riedel, Erlangen, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
A noncontact electronic switching arrangement is provided with an oscillator which can be damped by external objects. In accordance with the invention, the oscillator can be excited externally and is coupled to an evaluation circuit and an amplifier. A frequency control, which may consist of a phase-locked loop module, is connected to the externally excited resonant circuit of the oscillator. A reference voltage comparator at the output of the oscillator delivers at a Schmitt trigger output, pulse signals to a retriggerable time delay stage, or a shift register, which are connected to an exclusive-OR stage. The functioning of the exclusive-OR stage can be programmed. The arrangement is particularly useful as a limit or end switch for machine tools.