| 摘要 |
PROBLEM TO BE SOLVED: To separate the coil of a comb-shaped magnetic sensor into an excitation coil and a detection coil to design both coils under respective independent conditions and to realize the reduction of a signal processing circuit and the simplification of the constitution of a selector circuit. SOLUTION: First, the switch 4a of a selection circuit 4 is closed to excite an exciting coil 11b and both induced voltages of detection coils 11a and 11c are selectively outputted to a differential amplifier 6 by a selection circuit 5. Next, a switch 4b is closed to excite an exciting coil 11d and both induced voltages of detection coils 11c and 11e are selectively outputted to the differential amplifier 6 by the selection circuit 5. Further, a switch 4c is closed to excite an exciting coil 11f and both induced voltages of detection coils 11e and 11g are selectively outputted to the differential amplifier 6 by the selection circuit 5. COPYRIGHT: (C)2006,JPO&NCIPI
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