| 摘要 |
PURPOSE:To fetch a detecting signal of a stable waveform by constituting a rotating detecting body of a position detecting device of a magnetic material, and providing at least one projection on the outside peripheral part of its detecting body. CONSTITUTION:A rotation detecting body 21 rotating coaxially a rotating body to be measured (not shown in the figure) is constituted of a magnetic material, and this detecting body 21 is constituted in a shape of a gear by forming a lot of projections 22a, 22b... on its outside peripheral part. A magnetism detecting mechanism 23 is provided oppositely so as to be fixed through a gap (g) on the outside peripheral part of this gear-shaped rotation detecting body 21. This magnetism detecting mechanism 23 is provided with a substrate 24 of a nonmagnetic material, whose tip is turned to an axial core part of the rotation detecting body 21, and a magnetism detecting element 11 on which a pattern by a ferro-magnetic magneto-resistance material is formed so as to become a stage opposed to the projections 22a, 22b... by the gap (g) is installed and set to one surface of this substrate 24, and set to a state that a magnetic resistance is controlled variably against a passage of the projections 22a, 22b.... |
