| 摘要 |
PURPOSE:To enhance detection sensitivity without making a case large-scaled, by providing the first yoke in the case in opposed relation to the end surface of the magnet on the side opposite to a magnetic pole and providing the second yoke to the outside of the case. CONSTITUTION:A magnetic pole 3 is mounted to one end surface of the magnet 2 provided in a case 6 in a closely adhered state and a coil 4 is provided to the circumference of the magnetic pole 3 through a bobbin 5. The first yoke 10 provided in opposed relation to the other end surface of the magnet 2 is provided to the case 6 so as to be closely adhered to the inner peripheral surface thereof. The second yoke 11 is fixed to the outside of the case 6 positioned around the first yoke 10 so as to be soldered to the outer peripheral surface of the case 6. By this constitution, the flux emitted from the magnet 2 is gathered to the second yoke 11 outside case 6 and the first yoke 10 inside the case 6 and the detection sensitivity of a sensor is enhanced without making the case of the sensor main body large-scaled.
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