| 摘要 |
Acceleration sensors 2, 3 and 4 and a microcomputer 5 are mounted on a sensor mounting board 6. At this time, the accelerations sensors 2, 3 and 4 are arranged so that, even in the case where any of detection axes 2A, 3A and 4A of the acceleration sensors 2, 3 and 4 is made horizontal, the other detection axes of the acceleration sensors cannot be horizontal. Then, the microcomputer 5 selects an acceleration sensor in which detection accuracy is the best from among the acceleration sensors 2, 3 and 4, and arithmetically operates a tilt angle of a tilt sensor unit 1 based on an output signal of the selected acceleration sensor.
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