ROTATION DETECTION SENSOR AND ROTARY PLATE FOR THE ROTATION DETECTION SENSOR

摘要

PROBLEM TO BE SOLVED: To provide a rotation detection sensor and a rotary plate for the rotation detection sensor capable of avoiding the effect of surroundings without increasing parts number and detecting with a high accuracy by using a rotary plate which does not require high accuracy. ;SOLUTION: On a rotary plate 2 for a rotation detection sensor, magnetic path change pieces 6a, 6b and 6c are extended and formed. On the rotary plate 2, a magnetic path forming projection 8 is extended and formed. A magnetism detection member 3 is arranged in the space positioning in between the magnetic path change pieces 6a, 6b and 6c an the magnetic path forming projection 8. A detection part main body 10 is constituted of the first to the third magnetic detectors 13, 14 and 15. The first to the third magnetism detectors 13 to 15 are constituted of the first to the third magnetic resistance elements 13a to 15a and the first to the third bias magnets 13b to 15b.;COPYRIGHT: (C)2000,JPO