| 摘要 |
PROBLEM TO BE SOLVED: To detect a displacement with high resolution, and also with high accuracy even in a severe temperature environment. SOLUTION: An axis of rotation 3 is provided in a housing 1 with the axis freely and angularly displaceable, and a piece to be detected 4 which can be realized by a strong magnetic material is fixed to the axe of rotation 3. A displacement detecting Hall element HE2 and a compensating Hall element HE1 are fixed to the housing. The displacement detecting Hall element HE2 faces a displacement detecting surface 5 where the radius of the piece to be detected 4 changes and accordingly a gap G2 changes in response to the amount of an angular displacementθ. The compensating Hall element H1 faces a compensating surface 6 where the gap G1 is kept constant. A bias voltage is changed and set so that a differenceΔE between the output voltage of the compensating Hall element HE1 and a reference voltage E1 from a reference voltage source becomes zero, and it is given to the displacement detecting Hall element HE2. Thereby, the displacement detecting Hall element HE2 can obtain an accurate output voltage in response to the amount of the angular displacement of the piece to be detected 4, regardless of temperature changes.
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