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US 5,469,769 AGranted
Soundboard for musical instruments
AssigneeYamaha Corporation
InventorsShuichi Sawada, Katsuhiko Imagawa, Yoshihiko Murase
Life of this patent
Estimating the term…
Abstract
In a laminated construction of a soundboard for use in musical instruments such as the piano, the use of a core having larger shearing elastic modulus and/or smaller shearing loss tangent than that of the fore and rear plates assures small shearing loss in the treble range, and greatly improves the total tonal balance over the entire tonal range.
Claims12
An improved soundboard for musical instruments comprising fore and rear plates, and
- a core interposed between and bonded to said fore and rear plates and made of a material with a shearing elastic modulus greater than that of said fore and rear plates and with a shearing loss tangent that is less than that of said fore and rear plates, said shearing elastic modulus of said material for said core being less than 3.0.times.10 dyne/cm.
An improved soundboard for musical instrurnents comprising fore and rear plates, and
- a core interposed between and bonded to said fore and rear plates and made of a material with a shearing elastic modulus greater than that of said fore and rear plates and with a shearing loss tangent that is less than that of said fore and rear plates.
Dependencies are inferred from the claim text.