| 摘要 |
PURPOSE:To prevent occurrence of abnormal phenomena, such as resonance phnomenon, etc., by stretching a flexible damping film between the peripheral part of the diaphragm and a frame and fixing the central part of the diaphragm to the top of a supporting projected piece united with the frame in one body. CONSTITUTION:A piezo-electric body 2 is glued on the surface of a diaphragm 1 of a metallic thin plate of a loudspeaker, with a conductive bonding agent, and the diaphragm 1 is also used as the electrode of the piezo-electric body 2. An electrode 3 is formed on the surface of the piezo-electric body 2 and a flexible damping film 7 is stretched between the peripheral part of the diaphragm 1 and a frame 8. Moreover, the central part 4 of the diaphragm 1 is fixed to the top of a supporting projected piece 9 formed together with the frame 8 in one body. The central part 4 of the diaphragm 1 is connected to one end of a lead wire 5 and the other end of the wire 5 is connected to a signal source 6, and then, the signal source 6 is connected with the frame 8 through a lead 11. According to such a constitution, occurrence of abnormal modes, such as resonance phenomenon, etc., can be inhibited, because the central part 4 is firmly fixed and the damping film 7 is installed. In addition to the above, an opening 12 which increases the effect is formed in the frame 8. |
