| 摘要 |
PROBLEM TO BE SOLVED: To improve sound pressure on a low frequency region.SOLUTION: An acoustic generator includes: a film 3; a frame member 5 provided in a peripheral part of the film 3; a piezoelectric element 1 provided in the film 3 within the frame member 5; and a resin layer 20 filled within the frame member 5 so that the piezoelectric element 1 is embedded. The resin layer 20 has an uneven pattern on a surface. Thereby, rigidity of the resin layer 20 is lowered compared with a case where the surface of the resin layer 20 is flat and smooth; a first resonance frequency that a vibration body, which is composed of the film 3 and the resin layer 20, united with the piezoelectric element 1, has is reduced. |
