| 摘要 |
PURPOSE:To improve reproducing performance of the high frequency range by uniting a cylinder made of different materials with a diaphragm, and by joining on electrostrictive element with the end surface of the cylinder. CONSTITUTION:A cylinder 9 consists of bonding synthetic resin of a hardening type, is bonded uniformly so that it will encircle the outside of the cone neck part of a resonance plate 2 in the condition of soft and unhardened, and joins with the resonance plate 2 by the flat end surface by pressing down and hardening the cylinder 9 to the center part of an electrostricitive element 1 and the resonance plate 2. An edge supporting part 10 made of synthetic resin, etc., consists of the material which is different from an oscillation plate 3 and a frame 6, is joined so that it will encircle an edge part 3b of the diaphragm 3 uniformly, and is supported by the frame 6. Therefore, the cylinder 9 becomes the filter or acoustic resistance, transmits oscillation of the electrostrictive element 1 to the diaphragm 3, and enlarges the reproducing sound area. |
