PROBLEM TO BE SOLVED: To facilitate mounting work of a magnetoresistive element and reduce irregularity of the size of a gap between a sensing surface of the magnetoresistive element and a non-magnetic protection case. ;SOLUTION: A circuit board 25 mounted with components 22 to 24 is housed in a component housing part 31 of a non-magnetic protection case 28 by inserting opposite end parts thereof into guiding recessed parts 32. The circuit board 25 is disposed close to the detection hole 29 and parallel to the axial direction of the detection hole 29 (the passing direction of a steel ball 40). A magnet resistive element 22 and the like are disposed between the circuit board 25 and the detection hole 29, and a sensing surface 35a of the magnetoresistive element 22 stands parallel to the axial direction of the direction hole 29.;COPYRIGHT: (C)1999,JPO
展开▼
