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:
May. 01, 2001
Filed:
Mar. 25, 1999
Jaromir Palata, Friedrichshafen, DE;
Jörg Schulz, Lustenau, AT;
i f m electronic GmbH, Essen, DE;
Abstract
A capacitive switch is presented including an oscillator, with a gauge length and an evaluation circuit. The oscillator delivers a measurement signal and the gauge length has at least one sensor with a sending electrode and a measurement electrode. The switch has a low noise emission and is especially invulnerable to incident noise due to the fact that there is a noise source and two correlators. In the first correlator, frequency-spreading of the measurement signal takes place. The frequency-spreading measurement signal is connected to the second input of the second correlator and to the sending electrode. The measurement electrode is connected to the first input of the second correlator.