| 摘要 |
PURPOSE:To increase driving efficiency of a pump, by providing two magnets so as to obtain the same polarity to each other in a solenoid coil of a vibrator and magnet shoes between the solenoid coil and the magnets. CONSTITUTION:A pump provides a supporting shaft 6 of a vibrator in the center shaft part of a solenoid coil 1 and magnets 7a, 7b in a part corresponding to the internal peripheral end of yoke plates 4a, 4b. Both the magnets 7a, 7b form their mutually opposed surfaces to be set to the same magnetic polarity. Magnet shoes 8a-8d, forming the acting magnetic field in large density of magnetic flux, are fixed onto end faces of both the magnets 7a, 7b. Accordingly, the pump, increasing mutually acting magnetic force between the solenoid coil and the vibrator, enables the driving efficiency to be increased. |
