| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetism detecting sensor which can accurately detect magnetized sections and nonmagnetized sections arranged on a marker. SOLUTION: A magnetism detecting sensor is provided with a first magnetism detecting element 2 which generates a voltage based on the detected magnetism of magnetized sections 22 arranged on a marker 21, a second magnetism detecting element 3 which generates a voltage based on the geomagnetism detected from the periphery, and a differential amplifier circuit 6 which compares the voltages generated from the elements 2 and 3 with each other and makes each circuit of the poststage generate a pulse by amplifying the difference voltage.
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