| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a switch device such that two switch operations can be performed at the same time with one hand. <P>SOLUTION: A first rotary operation body 11 which can be rotatably operated is arranged at a one-side part 2a of a musical instrument body 1 so that a part of it projects from an upper surface of the musical instrument body 1, and a second rotary operation body 12 which can be rotatably operated is arranged behind the first rotary operation body 11 so that a part of it is exposed to a side face side of the one-side part 2a. The second rotary operation body 12 is arranged at a position where the exposed part of the second rotary operation body 12 can be rotatably operated horizontally with a finger other than the thumb of a left hand when the projection part of the first rotary operation body 11 is rotatably operated up and down with the thumb. Therefore, when the left hand is applied to the one-side part 2a located on the left side of an upper case 2 of the musical instrument body 1, the thumb of the left hand comes to the first rotary operation body 11 and another finger other than the thumb comes to the second rotary operation body 12, so that the first and second rotary operation bodies 11 and 12 can be rotated individually only with the left hand. <P>COPYRIGHT: (C)2013,JPO&INPIT |
