Patent attributes
A keyboard device is provided including a chassis; a mass body which is turnably installed in the chassis; and transmission means which transmits a driving force in response to key touching of a key to the mass body, wherein the mass body includes an inner wheel and an outer wheel installed on a radially outward side of the inner wheel and is configured to serve as a component for transmitting a torque in one-way direction between the inner wheel and the outer wheel. The transmission means is engaged with one of the inner wheel and the outer wheel of the mass body. The torque is transmitted between the inner wheel and the outer wheel of the mass body at a time of key touching. The torque is not transmitted between the inner wheel and the outer wheel of the mass body at a time of key release.
