| 摘要 |
PURPOSE:To suppress the bounce of pulse signal and improve the sharpness degree, by removing rotor plates with fitted ring-shaped driving magnets, partially every specified magnetic pole, and by exposing a main magnetic pole and the adjacent auxiliary magnetic poles. CONSTITUTION:A rotor 12 with cup-shaped cross section is arranged to confront a stator 9 formed by fitting a magnetic core 5, salient pole teeth 6, and a driving coil 7 on a supporting plate 4. A ring-shaped driving magnet 11 with alternately magnetized different poles on the circumferential section of the rotor plate 10 of the rotor 12 is fitted with a distance from the tip of the salient pole teeth 6 of the magnetic core 5. A notched section 14 is formed on the side wall 13 of the rotor plate 10 every specified magnetic pole, and a main magnetic pole 15 for pulse signal output which is integrated with the magnet 11 is saliently provided for the center of the notched section 14. Auxiliary magnetic poles 16 of weak magnetic force are provided in close contact with the main magnetic pole 15 and for the both sides of the main magnetic pole 15. Pulse output is generated from the coil 17 in close contact with the rotor 12, due to leakage flux through the main magnetic pole 15 and the auxiliary magnetic poles 16. |
