| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve durability of a keyboard apparatus by suppressing a change in key pushing end positions due to frequent use while maintaining a good buffering function on ending of key pushing. <P>SOLUTION: An upper side stopper body ST is arranged on the underside of the rear part 4d of a keyboard chassis 4, and in the upper side stopper body ST, a front side stopper part 10 is disposed in the front side and a three-layer structured backside stopper part 20 is disposed in the back side along the longitudinal direction of a hammer 2. In the forward stroke of turn of the hammer 2 by key pushing operation, a free end part 2d of the hammer 2 is abutted on the backside stopper part 20 first, and after kinetic energy of the hammer 2 decreases, the free end part is abutted on the front side stopper part 10, and the turn end position of the hammer 2 is regulated by cooperation of the front side stopper and 10 and the backside stopper 20. The modulus of longitudinal elasticity is the highest at the front side stopper part 10, and the lowest at the third layer 23, the lowest layer of the backside stopper part 20. <P>COPYRIGHT: (C)2008,JPO&INPIT |
