| 摘要 |
PROBLEM TO BE SOLVED: To provide a vibration alarm which is as thin as to be buildable into a wristwatch and with which strong vibrations for alarm may be obtained. SOLUTION: This vibration alarm is composed of a piezoelectric element 5, a base 8, a spacer 16, a spacer 27, and a weight 4, allows the placing of a weight of relatively large weight at the front end of the movable part of the piezoelectric element in spite of the thin type and enables the utilization of the piezoelectric element which is a vibration source to the maximum possible extent.
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