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:
Oct. 29, 2019
Filed:
Mar. 17, 2016
Applicant:
Hitachi Automotive Systems, Ltd., Ibaraki, JP;
Inventors:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS, LTD., Ibaraki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01P 15/125 (2006.01); G01L 9/12 (2006.01); G01P 15/08 (2006.01); B81B 3/00 (2006.01); G01C 19/5726 (2012.01); G01D 5/24 (2006.01);
U.S. Cl.
CPC ...
G01P 15/125 (2013.01); B81B 3/0021 (2013.01); G01C 19/5726 (2013.01); G01D 5/24 (2013.01); G01L 9/12 (2013.01); G01P 15/08 (2013.01); G01P 15/0802 (2013.01); B81B 2201/0235 (2013.01);
Abstract
In a capacitance detection type sensor system, a sensitivity of the sensor system deteriorates because a low frequency noise typified by a 1/f noise cannot be separated in frequency from a signal band. A carrier wave used for capacity detection is modulated with two kinds of frequencies, sampled at a first modulation frequency, subjected to a C/V conversion, and synchronously detected at a second modulation frequency to obtain a signal.