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:
Mar. 14, 1978
Filed:
Jul. 18, 1975
Hiroyuki Ookubo, Narashino, JA;
Yoshimi Makino, Fujisawa, JA;
Sony Corporation, Tokyo, JA;
Abstract
Apparatus is provided for producing an output signal upon sensing the proximity of a source of magnetic field. The apparatus includes a magnetoresistive element which is comprised of an insulating substrate upon which first and second ferromagnetic strips are provided. The ferromagnetic strips define first and second main current conducting paths which are respectively perpendicular to each other. The strips are connected in series to define a junction therebetween from which an output signal is derived. Current supply terminals are provided for furnishing an energizing current to the magnetoresistive element. Impedances are connected in parallel with the series-connected strips to thereby form a bridge circuit with the ferromagnetic strips, the junction between the strips serving as a bridge output terminal. A generator magnet has a surface disposed in a plane spaced from the magnetoresistive element and produces a magnetic field which is sensed by the element. An output signal is produced from the junction in the element as a function of the relative positions of leading and trailing edges of the generator magnet with respect to a leading edge of the magnetoresistive element.