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:
Jun. 25, 2013
Filed:
Mar. 02, 2011
Eric Bulach, Meckenbeuren, DE;
Eric Bulach, Meckenbeuren, DE;
RAFI GmbH & Co. KG, , DE;
Abstract
A capacitive switch () comprising a housing frame (), a thin-walled cover plate () held thereon, a printed circuit board () with a copper layer () that generates a capacitive field () applied to a surface () of the circuit board () that faces the cover plate (), the copper layer () being connected to an inside surface () of the cover plate (), the capacitive switch () being adapted to ensure that electrical devices can be operated safely, in that changes in the capacitive field () are picked up by the switch () in a redundant manner. At least two sensor surfaces () are disposed in the circuit board (), and are each electrically connected via an integrated circuit () to a microcontroller control and evaluation unit, and the circuit board () functions as an insulation between the copper layer () and the sensor surfaces (), and both integrated circuits () are controlled alternately by the microcontroller () for measuring the capacitive field () of the copper layer ().