| 摘要 |
PROBLEM TO BE SOLVED: To provide an acoustic emission film configuration for a music wrist watch or a wrist watch with a striking mechanism capable of improving an acoustic efficiency over a wide frequency range and securing airtight of impermeability and durability to a high external pressure of a wrist watch case.SOLUTION: A wrist watch with a striking mechanism or an acoustic emission film configuration 1 for a music wrist watch includes a first film 2 constituted in such a manner to be superposed on a second film 4. Peripheral edge portions 21, 41 of the first film 2 and the second film 4 are intended to hold a film inside the wrist watch case. The first acoustic emission film 2 is configured in such a manner to efficiently emit the frequency in a first frequency band. The second acoustic emission film 4 is configured in such a manner to efficiently emit the frequency in a second frequency band different from the frequency of the first frequency band.SELECTED DRAWING: Figure 2 |
