| 摘要 |
PURPOSE:To generate voltage even in case of no signal so that a malfunction is not generated even if a noise is superposed, by forming a shape of the outside circumferential surface of a signal rotor of the first signal generator, so that a space against an opposed iron core is gradually increased as the signal rotor rotates, except the projecting part. CONSTITUTION:A signal rotor 7 of the first signal generator rotates as a driving shaft 5 rotates, and when a projecting part 7a is opposed to an iron core 13 of a coil 14, a signal having both polarity is generated. The outside circumferential shape of the signal rotor 7 is formed so that a space between the iron core 13 and the outside circumferential surface is gradually increased as it rotates, therefore, an output of the coil outputs voltage being slightly larger than zero. Therefore, a malfunction of the first signal generator can be prevented by setting an operation level of the first signal generator so that it does not become lower than an operation level of the second signal generator, even if a noise generated by an output signal of the second signal generator is superposed. |
