| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a key touch feeling which is close to a key touch feeling of an acoustic piano without using a heavy hammer. <P>SOLUTION: A cam mechanism 3 for imparting an action load on a key 2 when the key is pressed has a cam member 6 which rotates as the key is pressed and a coil spring 7 which energizes the cam member 6, which has a tilt guide groove 10 guiding the key 2 from the start of key depression to right before the end of key depression, a no-load guide groove 11 guiding the key 2 from right before the end of key depression to the end of key depression, and a key release guide groove 12 guiding the key 2 when the key is released continuously in an annular shape. Consequently, the key 2 is given with an action load gradually increasing in key load by the tilt guide groove 10 from the start of key depression to right before the end of key depression, a key touch feeling such that the key pressing force decreases by the non-load guide groove 11 from right before the end of key depression to the end of key depression, and smoothly return the key 2 to its initial position by the key release groove 12 when released. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
