| 摘要 |
PURPOSE:To eliminate the need for a speaker cover, by a method wherein an audible alarm emitting hole is positioned at a side of a watch. CONSTITUTION:A panel cover 5 is placed at an under part of a glass 4 so as to cover a resonator 7. An audible alarm emitting cylinder 9 of the resonator 7, made of a plastic material, mates a hole in an arm band fixing part of a watch case 1. A second vibrating sheet 15 is attached to the under surface of the resonator 7, and this forms a resonance space 10. With a coil 2 charged with AC, current, afirst vibrating sheet 14 vibrates. The vibration is transferred to the second vibrating sheet 15 through the air spring action of a space between the first vibrating sheet 14 and the second vibrating sheet 15. |
