VIBRATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a vibration device in which any force other than force for moving a needle from a coil spring in an axial direction can be prevented from being loaded to the needle with a simple configuration. SOLUTION: This vibration device 1 uses a closed end compressed coil spring S, wherein the number of active turns is three turns or more and the number of end turns at both ends one turn. A needle 3 that performs reciprocating motion in one direction with respect to a fixed part 2 is arranged. The coil spring S is respectively arranged at both sides of the needle 3 to hold the needle 3 with repulsion with respect to the compression of the coil springs S. End parts 40a of contact parts 40 between the first turn 41 and the second turn 42 of both ends 4 are made to coincide in axial direction vision while the coil springs S are arranged. COPYRIGHT: (C)2003,JPO