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. 10, 1978
Filed:
Apr. 22, 1977
Clark E Johnson, Jr, Weston, MA (US);
Other;
Abstract
A displacement transducer in which two toothed members have magnetic poles arranged in alternating sequence. The toothed members cooperate so that one magnetic pole on one of the members is spaced from a magnetic pole of opposite polarity on the other member. The magnetic poles, furthermore, are spaced so that magnetic flux lines pass through the space or air gap between poles of opposite polarity. A magneto-resistive element is held within that air gap between magnetic poles, and is intercepted by the magnetic flux lines. This magneto-resistive element has an electrical resistance which is dependent on the angular orientation and magnitude of the flux lines with respect to the element. By measuring the electrical resistance of the magneto-resistive element, the angular orientation of the flux lines and thereby the relative displacement of the toothed members may be obtained. The toothed members may have the form of gear racks for measuring linear displacements, or they may be in the form of face gears for providing torque measurements. An electrical bridge connected to the magneto-resistive element provides the indicated displacement measurement.