Patent ID: 7154033

Claim:
A keyboard for musical instruments having a plurality of keyboard rows, said keyboard comprising: a semitone arrangement keyboard section situated at a rear side of said keyboard; and a whole-tone arrangement keyboard section situated at a front end of said keyboard; said whole-tone arrangement keyboard section including a plurality of whole-tone arrangement keyboard rows in each of which laterally adjacent keys generate tones with a difference of whole tone, said plurality of whole-tone arrangement keyboard rows being staggered such that front-to-rear adjacent keys generate tones with a difference of semitone, wherein each key making up a rearmost whole-tone arrangement keyboard row generates the same tone as generated by a key in opposition thereto of said semitone arrangement keyboard section, and wherein said semitone arrangement keyboard section includes rectangular key tops, with key tops in opposition to key tops of said whole-tone arrangement keyboard section being each formed with a raised portion which has substantially the same width in the longitudinal direction, with key tops out of opposition to key tops of said whole-tone arrangement keyboard section being each formed with a raised portion whose extremity is enlarged.