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. 04, 2008
Filed:
Nov. 28, 2006
Yuji Nihei, Mohka, JP;
Yasunori Abe, Mohka, JP;
Yuji Nihei, Mohka, JP;
Yasunori Abe, Mohka, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A magnetic encoder having a magnetic sensor composed of SVGMR elements, in which a signal output with a cycle equal to or less than a third of a cycle of magnetic patterns on a magnetic medium. The magnetic encoder comprises the magnetic medium, on which first magnetic regions and second magnetic regions are oppositely magnetized along the medium extending and disposed successively and alternately with each other, and the sensor that has three SVGMR elements or more and is movable relatively to the medium along the medium extending. Magnetizations of pinned magnetization layers of all the SVGMR elements are directed in the same direction along the medium extending. The SVGMR elements in the sensor are apart from each other along the medium extending by a length p, defined by 1/(the number N of the SVGMR elements in the sensor) of the sum of a first magnetic region length plus a second magnetic region length, and the SVGMR elements in the sensor are connected in series so that a cycle of resistance change of the sensor is 1/N of a cycle length of magnetic patterns on the medium, and the signal output with high resolution can be obtained.