| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a keyboard device of an electronic keyboard instrument provided with a specific mechanism capable of retaining the function of a motion control member for a long period, when a material which a plurality of particles are enveloped with an envelopment member is used as a motion control member for controlling a rotation range of a rotation member. <P>SOLUTION: A movement control member 71 to be a lower limit stopper 5 is provided in a closed region wholly enveloped by a key frame 3a and an envelopment member 12 regarding an inclined wall 71a, a vertical wall 71b, and a base part 71c as one unit along the arraying direction of keys. When a mass concentration part 28e collides, a particle 11 ascends along the surface of the inclined wall 71a. A joined part between the inclined wall 71a and the vertical wall 71b becomes the highest end as a barrier, so that the ascended particle 11 is made hard to move to the adjacent region. When the load is released, the plurality of particles 11 are moved downward due to gravity and returned to the original flat arrangement. <P>COPYRIGHT: (C)2008,JPO&INPIT |
