| 摘要 |
<p>PROBLEM TO BE SOLVED: To make it possible to detect an operator's playing form by constituting the musical instrument in such a manner that the fulcrum point of a massive body means slides on a sliding supporting means according to the rocking motion of a key and that sensor means detect the sliding state of the fulcrum part over the entire stroke thereof. SOLUTION: The back side (on the right side in Fig.) of a keyboard frame 10 is provided with a rectangular slit 101, from which the end of the massive body 30, i.e., a mass nucleus part 33, projects. The massive body 30 moves cooperatively with the rocking motion of the key 20. The base part 31 of the massive body 30 has a fulcrum recessed part 35 and has the massive body fulcrum part 34 sliding along the guide groove of the sliding member 42 in its central part. The massive body has an insertion hole for rigidly supporting a bar-shaped mass concentrating part 32 on the other end side. The sliding member 42 has a hollow groove for sliding and guiding the massive body fulcrum part 34. Photosensors are embedded in both sides thereof apart a prescribed distance from the flanks of the massive body fulcrum part 34 to detect the sliding state of the fulcrum part 34. As a result, the operator's playing form is detected and the playing having the power of expression is performed by reflecting the form in production of musical tones.</p> |
