| 摘要 |
<P>PROBLEM TO BE SOLVED: To enhance the operability of each black key for performance by maximizing the radius of turning motion of a mainly operated portion of the black key in a key depressing/releasing direction. <P>SOLUTION: In a key frame KU, a white key body 23 is connected to each base end part 21 through a vertical hinge part 24 and a horizontal hinge 22, which enable a free end part of the white key body 23 to freely turn in a key array direction and a key pressing/releasing direction. Further, a black key body 43 is connected to a base end part 41 through a horizontal hinge part 42b, which enables a free end part of the black key body 43 to freely turn in a key pressing/releasing direction. The horizontal hinge part 42b of a black key 40 is disposed behind the horizontal hinge 22 of a white key 20. <P>COPYRIGHT: (C)2007,JPO&INPIT |
