JPS6428576A - Magnetic body detector - Google Patents

Abstract

PURPOSE:To minimize changes in sensitivity over a wide temperature range, by a method wherein a plurality of magnetic resistors are formed on the same pellet and with the minimization of a temperature characteristic difference therebetween, a magnetic bias is applied with a magnet to the respective resistors to set amplification factors of first and second amplification circuits divided to a specified value. CONSTITUTION:First to sixth electric resistors RM1-RM6 and P1-P10 as input/ output terminals thereof are formed on an alumina substrate 11 of a magnetic body detector. A pattern should be such that the center-to-center distance L of the resistors RM1 and RM2 is a half a pitch of magnetic teeth while other resistors RM3-RM6 are folded once. The positions of the resistors RM1-RM3 are separated to the right and left from the positions of those RM5, RM4 and RM6 and a magnetoresistance element pellet 10 thus arranged is baked on an alumina substrate 12 to be mounted on a hybrid IC substrate 15. A bias magnetic field is applied to the resistors RM1-RM3 and RM5 with a magnet and an amplification factor of a first amplifier of an amplification circuit 16 is determined by the resistors RM3 and RM5 while an amplification factor of a second amplifier done by the resistors RM4 and RM6.