| 摘要 |
PROBLEM TO BE SOLVED: To provide a position detection device which can be reduced in thickness in the direction perpendicular to position detection direction, has a large change in the intensity of a magnetic field in response to the movement of an object to be measured, has good linearity in the amount of change in the intensity of a magnetic field in response to the amount of movement, and has high position detection accuracy. SOLUTION: The device comprises a ferromagnetic section 3 comprising ferromagnetic members 1, 2 placed a predetermined interval apart and a magnetic field generation detection section 8 which comprises a permanent magnet 5, a magnetosensitive probe 6, and a permanent magnet 7 which are placed in space formed by the ferromagnetic section 3 and are placed along a line in this order. The magnetic field detection direction of the magnetosensitive probe 6 is placed in the direction of the ferromagnetic members 1, 2. The magnetization directions of the permanent magnets 5, 7, which are opposite in direction, are placed in the same direction as the magnetic field detection direction of the magnetosensitive probe 6. Relative position of the permanent magnet 5, the magnetosensitive probe 6, and the permanent magnet 7 with respect to the ferromagnetic section 3 is detected according to a magnetic field detected by the magnetosensitive probe 6. COPYRIGHT: (C)2005,JPO&NCIPI
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