| 摘要 |
PROBLEM TO BE SOLVED: To enhance the expressive power in playing by including a switch for detecting the depression quantity of key in four steps in a keyboard device of electronic musical instrument having an information processing system of two bits. SOLUTION: This keyboard device includes a contact point 1 which forms a first switch, a base plate part 3 which is provided with a contact point 2 forming a second switch, a first contact part 4 which faces the base plate part 3 and conducts the contact point 1 forming the first switch by coming into contact therewith, a working part 6 which is provided with a second contact part 5 for conducting the contact point 2 forming the second switch by coming into contact therewith, an elastic member which supports the working part 6 and is made harder on the second contact part side than on the first contact part side and a depressing part which depresses the working part 6 toward the base plate part 3 on the extension line of the virtual line extending from the first contact part 4 to the second contact part 5 outside the second contact part 5. The first switch and second switch are conducted in this order by depression of the depressing part and further, the first contact part 4 is parted from the first contact point 1 with the second contact part 5 as fulcrum by depression of the depressing part. |
