| 摘要 |
<p>PURPOSE:To add a hysteresis characteristic (a load felt at a fingertip at key return time is far smaller than a load felt at the fingertip at key push time) to be brought close to a key touch of an acoustic piano. CONSTITUTION:A projecting lever 32 formed under a key 22 and a friction member 33 in which the projecting lever 32 is fitted and inserted and which has a recess in which viscous grease can be filled, are provided, and are formed integrally with a beyboard body by a thin wall elastic belt 34 so that the friction member 33 can move slightly freely in the key juxtaposed direction, and operational frictional resistance of the key 22 is increased, and a hysteresis characteristic is added to a key touch, and at the same time, dimension dispersion in the key juxtaposed direction is absorbed, so that smooth key operation by which a twist phenomenon is not presented, can be obtained.</p> |
