| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic sensor and a noncontact switch which prevents magnetic noise from being easily applied to a huge magnetic resistance element for detection from the outside of the magnetic sensor, and of executing stable magnetism detection. SOLUTION: The huge magnetic resistance elements R1, R2, R3 and R4 are disposed in a cylinder part 12a equally circumferentially divided into an N pole and an S pole, so that magnetic flux Z (magnetic field) is always provided to the resistance elements R2 and R2 from the cylinder part 12a. When a magnetic body 14 is positioned at a permissible position, the magnetic flux Z (magnetic field) is provided to the resistance elements R1 and R4 from the cylinder part 12a. When the magnetic body 14 is positioned at a shielding position, by shielding the magnetic flux Z from the cylinder part 12a by a shielding pipe part 14a of the magnetic body 14, the magnetic flux Z (magnetic field) is prevented form being provided to the resistance elements R1 and R4. COPYRIGHT: (C)2004,JPO&NCIPI
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