| 摘要 |
<p>PURPOSE:To obtain a key touch feeling corresponding to key pushing strength by movably providing the side of the free end of the key with a weight which is moved away from the rotatable supporting point of the key by centrifugal force caused by key pushing operation. CONSTITUTION:When A key 1 is feebly pushed, the key 1 is counterclockwise slowly rotated against the power of a reset spring 5, and a hook 14 leaves an upper limit stopper 16. A pressing part 6 presses a rubber switch 8 on the way of the rotation of the key 1 to bring the first movable contact 10 into contact with the first fixed contact 12, and then after short time interval, the second movable contact 11 into contact with the second fixed contact. Input data can be thereby obtained, and musical sounds corresponding t the input data are generated. Since strong centrifugal force does not act onto a weight 24 in feebly pushing the key 1 to hardly change the position of the weight 24, a distance A between a shaft 2 and the center of gravity of the weight 24 does not change, and the moment of inertia is also small. Thus a light key touch feeling is obtained at a finger tip in feebly pushing the key.</p> |
