Patent ID: 6995308

Claim:
An electric keyboard assembly comprising: a plurality of white keys that are each pivotally moved by a key depressing operation; a plurality of black keys that are each pivotally moved by a key depressing operation; a plurality of seesaw-type mass members that each have a first arm and a second arm each extending from a pivotal center of the mass member, said plurality of mass members being disposed in a manner associated with said plurality of white keys and black keys, respectively, and being each pivotally moved about said pivotal center when a corresponding one of said plurality of white keys or black keys is depressed, said plurality of mass members each having a resin portion, said resin portion of one of said mass members associated with one of said white keys being substantially identical in configuration with said resin portion of another of said mass members associated with one of said black keys which is adjacent to said one of said white keys; and a plurality of insert weight members that are carried respectively by said first and second arms of each of said mass members, and wherein said insert weight members have respective weights thereof set separately from each other, such that key-touch responses of said one of said white keys and said one of said black keys adjacent thereto are made similar to each other.