| 摘要 |
<p>PURPOSE:To improve an operation touch by providing compression coils which are detained respectively at one point in the toric outside diameter parts at both ends in the spring detaining parts respectively formed to plural keys and chassis. CONSTITUTION:The compression coils 5 detained respectively at one end in the toric outside diameter parts at both ends are provided to the spring detaining parts 3, 4 respectively formed to the keys 1 and the chassis 2 in such a manner that approximately the mid-point of the overall length attains an arc shape perpendicularly downward. Namely, the one point at both ends is connected to the detaining parts 3 of the keys 1 and the detaining points 4c of the detaining parts 4 fixed to the chassis 2 in such a manner that the approximately the mid-point attains the arc shape perpendicularly downward. The detention of the springs 5 is stabilized in this way and the operation touch of the keys is improved; in addition, the cost is lower than leaf springs and the constitution is simplified.</p> |
