Patent ID: 7297854

Claim:
A keyboard apparatus comprising: a support member; a plurality of keys each having a driving part, and disposed on said support member such that each key is pivotally movable about a base end part thereof, said keys comprising a plurality of white keys and a plurality of black keys; a plurality of pivotal motion supports fixedly provided on said support member; and a plurality of mass bodies provided in a manner respectively associated with said pivotal motion supports, and each having a driven part, said mass bodies being disposed in a manner pivotally movable about respective associated ones of said pivotal motion supports, and comprising white key-associated mass bodies that are associated with said white keys, respectively, and black key-associated mass bodies that are associated with said black keys, respectively, wherein said driving part of each key drives said driven part of an associated one of said mass bodies, in accordance with pivotal motion of said key, whereby said associated mass body pivotally moves about said associated pivotal motion support, and wherein said driven part of each white key-associated mass body and said driven part of each black key-associated mass body are at the same longitudinal location, and at the same time a distance between said driven part of said black key-associated mass body and said pivotal motion support associated therewith is longer than a distance between said driven part of said white key-associated mass body and said pivotal motion support associated therewith.