Patent ID: 6307366
Filing Date: 2001-10-23
Classification: G01B,G01D,G01R

Abstract:
A magnetic resistance effect device comprising:a plurality of magnetic sensing groups, each of said magnetic sensing groups including at least two magnetic sensing elements, each of whose resistance value is variable in response to a magnetic field generated in a scale structure including a plurality of magnetic poles of alternating polarity and equal width arranged serially in the longitudinal direction of the scale structure, said at least two magnetic sensing elements arranged spaced apart from each other by substantially the same distance as a width of the magnetic poles, each of said sensing groups arranged spaced apart from each other by substantially an integer multiple of a half of the width of the magnetic poles, wherein a voltage is applied to both outermost said magnetic sensing elements of a pair of consecutive magnetic sensing groups and an output is obtained from a connection between intermediate magnetic sensing elements of said pair of sensing groups; andeach sensing group including a wiring group comprising a plurality of wiring leads for applying said voltage and obtaining said output, each wiring group including among said wiring leads, leads arranged in the direction orthogonal to the longitudinal direction of the scale structure including a first lead associated with the outermost sensing element of the sensing group and a second lead associated with the intermediate sensing element of the sensing group and spaced from the first lead by an integer multiple of the width of the magnetic poles.