| 摘要 |
A keyboard device configured such that, when L represents a distance in a horizontal direction from a rotation support of a hammer member 3 to a contact point where a key 2 comes into contact with an elastic section 23 of the hammer member 3, I represents a moment of inertia around the rotation support, and K represents an elastic modulus in a vertical direction of the elastic section 23 coming into contact with the key 2, the relationship of L, I and K is set to (2/&pgr;)2·K·10-4(I/L2)4·(2/&pgr;)2·K·10-4. Accordingly, when the key 2 is depressed, a timing at which an action load applied to the key 2 by the hammer member 3 reaches its maximum is delayed by 10-20 milliseconds from the start of the depression, whereby the maximum action load can be applied at a timing that gives a key-touch feel close to that of an acoustic piano.
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