Patent ID: 6236200
Filing Date: 2001-05-22
Classification: G01V,H03K

Abstract:
A magnetic metal sensor moved relative to a unit under detection comprised of a plurality of magnetic metal pieces arrayed side-by-side at a predetermined interval .lambda. along a direction of side-by-side arraying of said plurality of magnetic metal pieces for detecting said magnetic metal pieces, comprising:a pair of magneto-electric conversion units each having a magnetically sensitive portion which responds to variations in a magnetic field along a direction of magnetic sensitivity; andmagnetic field generating means for applying the magnetic field along the direction of magnetic sensitivity to the magnetically sensitive portions of said pair of respective magneto-electric conversion units,wherein the improvement resides in thatthe magnetically sensitive portions in said pair of respective magneto-electric conversion units are of the same polarity, the direction of magnetic sensitivity is perpendicular to the direction of side-by-side arraying of said magnetic metal pieces, and a separation g' between neighboring magnetic metal pieces along a movement direction is given by:g'=(n+1/2).lambda.n being an integer not less than 0.