| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a black key of keyboard instrument which facilitates the mounting of weights and can easily regulate touch weight while using substitutive materials in place of lead as the materials of the weights. SOLUTION: This keyboard has a freely oscillatable keyboard body 2, a downwardly opened hollow part 3a, a black key cover 3 which is mounted to the upper surface of the keyboard body 2, and a weight 4 which is composed of composite materials formed by blending plural kinds of materials exclusive of the lead varying in specific gravity from each other, is housed in the hollow part 3a of the black key cover 3 and imparts the weight to the keyboard body 2.</p> |
