| 摘要 |
PURPOSE:To decrease the clearance between the detection surface of a magnetic head and a magnetic scale and to improve the accuracy of the scale by disposing >=2 pieces of magnets in parallel to a magnetosensitive element. CONSTITUTION:A front cover 2 is supported in contact with magnets 6, 7. Therefore, the clearance between a magnetic head and the detection surface of a magnetic scale 11 can be decreased and the resolution of the scale 11 can be improved. A parallel bias magnetic field is applied to a magnetosensitive element 5 by the magnets 6, 7; therefore, even if there is anisotropy in shape, the biasing in a magnetization direction or the like in the magnets, the direction of the bias magnetic field is determined exactly and the accuracy of the scale is improved without the DC biasing in the output of the element 5 or the fluctuation in the amplitude of the adjacent outputs. |
