| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotation angle detector of an angle sensor capable of compensating detection error due to temperature variation and individual difference at the time of production. SOLUTION: The rotation angle detector 10 of angle sensor provided with a ring magnet (magnetic circuit constituting part) 3 producing magnetic field, a first and a second Hall elements (magnetic density detector) 7 and 8 for outputting detection signal according to the magnetic flux density and an angle calculation means 12 for calculating the rotation angle of the ring magnet 3 to the first and the second Hall element 7 and 8 based on the detection angle comprises an amplitude detection means 13 for detecting the amplitude a of the detection signal, a correction value calculation means 14 for calculating an amplitude correction value e and an off-set correction value f from the amplitude a of the detection signal, a correction means 15 for obtaining a signal after correction from the detection signal and these correction values e and f, and a signal switching means 16 for switching the signal output to the angle calculation means 12 to either of the detection signal or the signal after correction. COPYRIGHT: (C)2004,JPO&NCIPI
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