| 摘要 |
PURPOSE:To improve the space efficiency and reduce the power consumption of a piezo-electric loudspeaker, by constituting a boosting transformer while installing the primary and secondary windings to a frame which is made of a magnetic material to fixing the outer periphery of the acoustic diaphragm, etc. CONSTITUTION:The outer periphery of a circular acoustic diaphragm 8 formed to have a concaved shape is fixed to a frame 9 and, at the same time, a hollow discoid substrate 10 is fixed to the frame 9. Then, a diaphragm for excitation 11 having a fixed piezo-electric material at least on one face is fixed to the substrate 10 and a part of the diaphragm for excitation 11 is fixed to the central part of the above mentioned acoustic diaphragm 8. Moreover, the primary winding 15 and the secondary winding 14 are installed to the above mentioned frame 9 and the secondary winding 14 is connected with the piezo-electric material 12. When grooves of more than one 9a and 9b are installed in the direction of thickness in the above mentioned frame 9 and the primary and secondary windings 15 and 14 are wound through the grooves, and is the most suitable one obtained. |
