| 摘要 |
PURPOSE:To make a piezo-electric receiver usable even to a person who has difficulty in hearing, by coupling each input terminals of a piezo-electric sound producing body and coils directly or by means of a driven circuit element. CONSTITUTION:One of the electrodes formed on both sides of a ceramic piezo-electric body 27 is directly coupled with a vibrator input terminal 30 and the other is coupled with another vibrator input terminal 26 through a diaphragm 24. A sound hole 22, through which acoustic waves are radiated from the piezo-electric vibrator, is provided in a front case 21. Moreover, a coil 23 and their input terminals 25 and 31 are simultaneously provided in the front case 21. The input terminal and vibrator input terminal 26 and 30 are fixed to a back case 32 and a leakage hole 29 and acoustic resisting material 28 are provided in the case 32. Both of the cases 21 and 32 are closely fitted and fixed to each other so as to firmly fix the diaphragm 24.
|
