Patent ID: 7365259
Filing Date: 2008-04-29
Classification: G10H

Abstract:
1. A keyboard apparatus comprising: a support member; a plurality of keys pivotably supported on the support member; and a plurality of mass members provided under the respective keys to be pivotably supported on the support member via pivotal fulcrum parts and driven to pivot via mass member driving parts provided under the plural keys respectively, the plurality of mass members forming a space therebelow, said space being outside of the movement range of the mass members, wherein the plural mass members extend along a longitudinal direction of the keys, have mass concentration parts in rear end portions thereof, and are mounted on the support member in such a manner that, when not driven, the mass members are in an inclined state with the mass concentration parts being at a lowest descended position, wherein the space is used for housing a necessary functional component of the keyboard apparatus, and wherein the support member has a rib provided between predetermined two adjacent mass members among the plural mass members and at least part of a lower edge of the rib is formed along lower edges of the mass members that are not driven and are in the inclined state.