| 摘要 |
PROBLEM TO BE SOLVED: To detect ON and OFF without affected by a temperature change with high accuracy. SOLUTION: A circuit board 21 provided with a unipolar detection type hole element 20 is mounted through a magnetic path board 25 on a sensor housing part 4 of a casing 3. A rod 10 is inserted into a through hole 7 of a rod support part 5 extended from the sensor housing part so as to stroke. The rod is energized in a direction for abutting a shoulder of a large diameter part 11 on an opening wall 4b by a spring 15, and a tip end is projected from an end surface 5a of the rod support part in an abutting state. A magnet 17 is mounted on the large diameter part 11, and the magnet is deviated from a front of the hole element 20 on both ends of a stroke range of the rod, and becomes closest to the hole element in a position where the rod is pushed by a predetermined amount. Because a direction of a magnetic line received by the hole element does not change until the magnet comes in the front and switches, ON and OFF are switched in a certain position irrespective of a temperature. COPYRIGHT: (C)2006,JPO&NCIPI |
