| 摘要 |
<P>PROBLEM TO BE SOLVED: To detect only an accurate percussion signal while decreasing sounding volume at the time of percussion with respect to an electronic instrument. <P>SOLUTION: A fixed metal fixture 19 is fitted to the inside of a shell 13, to be screwed with a screw 21. A support plate 22 is fitted to the upper end of the screw 21 and a cushion 23 is fixed to the top surface of the support plate 22. The cushion 23 is arranged nearly over the entire circumference except a separation part 23a along the inner circumference of the shell 13. The upper-end surface of the cushion 23 is made to abut against the reverse surface of a head 11. An inner-circumference side part of the cushion 23 is jagged. A sensor cushion 44 of a sensor unit 40 is made to abut against a head 11 at a position corresponding to the separate part 23a and the sensor unit 40 detects vibration of the head 11 directly. With a screw 21, the pressing force of the cushion 23 to the head 11 is adjusted. <P>COPYRIGHT: (C)2004,JPO |
