| 摘要 |
PURPOSE:To obtain a pulse signal of high level from a detecting coil by applying a leakage magnetic flux from a drive magnet to strengthen the magnetic flux of a magnet from generating a pulse signal. CONSTITUTION:Since a magnetic flux varies when the variable portion of the pole of a magnet 20 for generating a pulse signal passes the vicinity of a detecting coil 21, the coil 21 detects it and outputs a pulse signal in response to the sequence of the poles. Since the variable portions of the N- and S-poles of a drive magnet 19 and the variable portion of the pole of the magnet 20 are aligned, the coil 21 adds the leakage magnetic flux from the magnet 19 to raise the level of the pulse signal. Further, since the coil 21 is disposed to direct its winding axis toward the magnet 20, a counterelectromotive force is not generated to eliminate a repelling. |
