| 摘要 |
PURPOSE:To lighten a magneto-resistance veriation against a variation of a fitting angle of a detecting elemnt, by setting the thickness of a magneto-resistance effect thin film which forms a magneto-resistance variation detecting element for detecting a magnetic field variation corresponding to a rotation angle, to a prescribed value or above. CONSTITUTION:A ring-like magnetized pattern 3 consisting of a minute magnet group is formed on the surface of a disk 2 of a rotating body to be detected, and a magnetic field received by a detecting element 4 of a magneto-resistance effect thin film opposed in the vicinity of the pattern is varied in accordance with a rotation angle of the rotating body. Subsequently, electric resistance of the magneto-resistance effect thin film is varied and the rotation angle is measured electrically. When thickness of this magneto-resistance effect is set to 0.3mu or more, a difference between the maximum value and the minimum value of a magneto-resistance variation of the element 4, which is based on an angle made by an axis of difficult magnetization of the element 4 and the magnetic field is reduced suddenly, and simultaneously, the hysteresis characteristics becomes symmetrical. Accordingly, a magneto-resistnce variation against a variation of a fitting angle of a detecting element can be lightened, an assembly allowable range of a rotation angle detecting meter can be expanded, and also the detecting sensitivity and accuracy are improved. |
