| 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 device detects the depression quantity of a key of which the contact part conducts a contact point circuit wired to a base plate section by the depressing action of a switch. In such case, the contact part 4 forms a curved surface and faces the base plate part 3 apart therefrom. The contact part 4 is brought into contact with the contact point circuit wired to the base plate part 3 and is conducted therewith by the depressing action of the key and further, the curved surface of the contact part 4 is moved by the depressing action of the switch while its curved surface rolls on the surface of the contact point circuit. The depression quantity is detected by the contact part which is moved by the change in the depression quantity. |
