| 摘要 |
<p>The membrane (1) has two elliptical shaped asymmetrical areas (2, 3), hollowed out of the membrane with different uniform thickness from each other and less than thickness of a bottom part (4) of the membrane to maximize natural vibration frequencies of the membrane within a specific frequency range, where the membrane is dome-shaped. One of the elliptical shaped areas is centered on the membrane and another elliptical shaped area is off center on the membrane, where the areas are partly superposed. An independent claim is also included for a striking or musical watch including a watch case.</p> |
