| 摘要 |
PURPOSE:To extend the area of the diaphragm to lower the resonance frequency and improve the conversion efficiency, by extending a part of the diaphragm onto another function parts adjacent to the solenoid driving unit and by supporting it by the outside circumference of the case. CONSTITUTION:Diaphragm 45 welded to electrical sheet 38 is oscillated by solenoid unit 35 to perform acoustic conversion. Diaphragm 45 is extended onto cell 60 and is fixed to upper case 32 by soft supporting material 75. Holding material 46 of speaker 35 is provided in a part of upper case 32, and speaker 35 resists water due to preventing sheet 71 and waterproof ring 72 of beryllium-copper. |
