| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a soundproof structure for a piano excellent in sound insulation effect. SOLUTION: A back board 11 covering a back face of a reduced sound piano 100 is divided into five panel constituting members 11a-11e, and the respective members 11a-11e have different sizes to be different in their characteristic frequencies. Vibration. control materials are interposed between the neighboring respective members 11a-11e, and their connecting parts are covered with a lead tape 20. Resonance of the respective members 11a-11e is prevented by this constitution, and the back board 11 is composed without impairing airtightness.</p> |
