| 摘要 |
<p>PURPOSE:To detect position of each key, by using at least three pressure detectors. CONSTITUTION:In depressing a key, a depressing piece 7 abuts on a projection 2a, since the piece 7 is an elastic body, the piece 7 is bent while its tip 7a and the projection 2a are contacted and a force depressing the key is stored in the piece 7 as a strain energy. When the key is depressed further, the overlapped section where the tip 7a of the piece 7 and the projection 2a is decreased through the bending of the piece 7, and the tip 7a is removed from the projection 2a. Then, the tip 7a collides with a force applying point 4a of a flat plate 4 corresponding to each key with the strain energy stored in the piece 7 and a force is applied to the flat plate 4. The component of force is detected at pressure detectors 5a-5d, the output of the pressure detectors is processed and the position of each key is detected.</p> |
