| 摘要 |
PURPOSE:To eliminate a vibrating plate and prevent a vibrating sound from occurring as well as to make full use of energy in an electromagnet without entailing any loss, by directly attaching a permanent magnet to a diaphragm of an air pump using the solenoid-driven diaphragm, as one body. CONSTITUTION:A plastic cylindrical bobbin 7 provided with a coil 9 around a columnar inner side iron core 6, and furthermore an electromagnet 1 having a tubular outer side iron core 10 and an end face iron core 11 is set up, while such a hole as making a permanent magnet 17 insertable through is installed in the end face iron core 11. This permanent magnet 17 is tightly attached to a diaphragm 21 of a bellows device 2 directly as one body, and with action of the electromagnet 1 the diaphragm 21 is guide by a guide shaft 18 whereby it is constituted so as to do its reciprocating vibration. |
