| 摘要 |
PROBLEM TO BE SOLVED: To reduce the overall size and the cost of a sensor while simplifying the circuitry by making it possible to detect the azimuth with sufficient accuracy although the output accuracy of a second sensor is lowered when geomagnetic azimuth is detected based on the outputs from first and second magnetic sensors secured while being spaced apart by a specified angle in their fixed directions. SOLUTION: With regard to geomagnetism He making an angleθor (180°-θ) with the plus direction of X-axis, the first magnetic sensor S1 generating an output proportional to sinθis secured to direct the Y-axis direction, and the second magnetic sensor S2 for judging to which range of (-90°to 90°) or (90°to 270°) theθbelongs is secured to direct a direction separated by a specified angleα(α≠180°) from the direction of the first magnetic sensor S1. The field detection accuracy of the second magnetic sensor S2 is set lower than that of the first magnetic sensor S1. COPYRIGHT: (C)2004,JPO
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