| 摘要 |
PROBLEM TO BE SOLVED: To provide a push button of a watch which is excellent in water-tightness against a change of ambient pressure.SOLUTION: A push button 51, composed of a head 9 and a stem 8, is arranged within an armature 50, and a first return spring 10 is arranged between the head 9 and first holding means 54 installed in the armature 50. The push button 51 includes a second return spring 13 which can be wound around the stem 8. The second return spring 13 is configured to serve as a valve spring when pressure inside a watch is higher than pressure outside the watch. |
