Keyboard device

Details Keyboard device Keyboard device

2010-06-24

2011-12-13

Lockett, Kimberly (Department: 2832)

Music

Instruments

General features

Reexamination Certificate

active

08076563

ABSTRACT:
A keyboard device configured such that, when L represents a distance in a horizontal direction from a rotation support of a hammer member3to a contact point where a key2comes into contact with an elastic section23of the hammer member3, I represents a moment of inertia around the rotation support, and K represents an elastic modulus in a vertical direction of the elastic section23coming into contact with the key2, the relationship of L, I and K is set to (2/π)2·K·10−4≦(I/L2)≦4·(2/π)2·K·10−4. Accordingly, when the key2is depressed, a timing at which an action load applied to the key2by the hammer member3reaches 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.

REFERENCES:
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patent: 06025884 (1994-04-01), None
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patent: 2005241887 (2005-09-01), None
patent: 2009086425 (2009-04-01), None

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