| 摘要 |
PURPOSE:To let loose a voice of satisfactory sound pressure and sound quality on the indication surface of a watch by applying a sound wave generated by a permanent magnet, a vibration plate, etc. provided under a back lid to the second vibration plate in the neighborhood of a front part of the case through a soundwave induction hole. CONSTITUTION:Under a back lid 19, a sound generating body consisting of a permanent magnet 20, a cylindrical outer magnetic yoke 2, a voice coil 23, a vibration plate 24, etc. is arranged. A sound wave generated by the vibration plate 24 is applied to the second oval vibration plate 12 pressed to contact with a case 4 through the intermediary of O ring near a watch front part of the case 4 after passing through a module inner soundwave induction hole 13 provided on a battery holder 16. Under this constitution which assures satisfactory space utilization efficiency and waterproofness, a voice of high sound pressure and sound quality is released from a voice release decorative plate on a watch indication surface. |
