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. 01, 2019
Filed:
Sep. 14, 2016
Applicant:
Ifm Electronic Gmbh, Essen, DE;
Inventor:
Jörg Schulz, Tettnang, DE;
Assignee:
IFM ELECTRONIC GMBH, Essen, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01D 5/24 (2006.01); G01R 27/26 (2006.01); H03K 17/955 (2006.01);
U.S. Cl.
CPC ...
G01D 5/24 (2013.01); G01R 27/2605 (2013.01); H03K 17/955 (2013.01); H03K 2217/960745 (2013.01);
Abstract
The present invention relates to an evaluation circuit for a capacitive sensor for detecting the distance, speed or position of an object, comprising a reference capacitance and two measuring capacitances, wherein the reference capacitance and the measuring capacitances are supplied with a square-wave voltage via a resistor, and wherein by use of a logic unit a time variable pulse is obtained the duration of which is a measure for the respective measuring capacitance.