| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve the compactness of a piezoelectric buzzer without reducing generated acoustic energy while securing the soldering of a piezoelectric diaphragm to a metal plate. <P>SOLUTION: The metal plate 21 has a ring-plate-like projection part 210 projected to the diameter-direction outside of a piezoelectric ceramic plate 22. The ring-plate-like projection part 210 is joined with a contact end part of a portion (refer to Fig.1) bent to the side of the metal plate 21 out of the tip part 43 of a coil spring 4 by solder 4. A soldering area 211 to be soldered to the coil spring 4 out of the ring-plate-like projection part 210 is widely formed to the diameter-direction outside as compared with other areas of the ring-plate-like projection part 210. <P>COPYRIGHT: (C)2008,JPO&INPIT |
