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:
Apr. 21, 2009
Filed:
Apr. 22, 2003
Lutz Axel May, Gelting, DE;
Georg Cuntze, Schwaben, DE;
Lutz Axel May, Gelting, DE;
Georg Cuntze, Schwaben, DE;
Abas, Incorporated, Chicago, IL (US);
Abstract
A transducer for measuring a displacement along an axis of movement of a first part relative to a second part, comprises a magnetic source for generating a magnetic field mounted to the first part, and a plurality of magnetic field sensing devices mounted to the second part to be movable relative to the magnetic field generated by the magnetic source. The sensing devices are spaced in the direction of the axis. A circuit arrangement is provided to which the sensing devices are connected to generate an output signal dependent on contributions from the sensing devices of the plurality. The magnetic source has North and South poles oriented in the direction of the axis. The sensing devices are each oriented to respond to an axially-directed component of magnetic field, and comprise at least two axially-spaced sensing devices whose contributions to the output signal are combined in a subtractive fashion.