| 摘要 |
PURPOSE:To enable accurate measurement by removing noise, by detecting the generated magnetic field of a rotation detecting magnetic body subjected to multipolar magnetization and that of a rotor magnet while applying operation processing to two detection signals. CONSTITUTION:A superposed signal of a signal obtained by converting the generated magnetic field of a magnetic body 1' detected by a hole element 2 to voltage and a signal obtained by converting the generated magnetic field of a rotary magnet 12 to voltage is applied to an amplifier 61 while the amplified signal is applied to an adder circuit 64. On the other hand, the generated magnetic field of the rotor magnet 12 detected by a hole element 13a is applied to an amplifier 62 and subsequently inverted by an inverter 63 to be applied to the adder circuit 64. In the adder circuit 64, the noise component signal in the superposed signal is erased by a reversal signal and only the signal obtained by converting the generated magnetic field of the magnetic body 1' to voltage is outputted. |
