Sound absorbing building component of synthetic resin sheeting
AssigneeFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorsNorbert Kiesewetter, Bertalan Lakatos
Life of this patent
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Abstract
A sound-absorbing building component for indoor paneling consisting of at least two superimposed sheets, preferably made of a synthetic resin. At least one of the sheets is provided with cup-shaped indentations lying side-by-side in the manner of a grid, the bottom surfaces of these indentations being excitable to lossy vibrations upon the incidence of sound. The upper rims of the cup-shaped indentations are all covered by a further planar sheet which is likewise capable of vibrations. This further sheet seals off the air volumes contained in the individual cup-shaped indentations in an airtight fashion. Small lumpy or irregularly-sized bodies can be provided on the bottom surfaces of the cup-shaped indentations.
Claims24
A sound-absorbing building component for indoor paneling, comprising:
- (a) a first sound-absorbing sheet, having a plurality of cup-shaped indentations lying side-by-side in a grid pattern, each of said cup-shaped indentations including (1) a planar bottom wall to be exposed to an acoustic field during installation, said bottom wall being excitable to a plurality of natural vibrations upon the incidence of sound at a plurality of frequencies and (2) a plurality of generally planar sidewalls which are also excitable to natural vibrations;
- and
- (b) a planar second sheet covering the upper rims of the cup-shaped indentations, wherein the air volumes contained in the individual cup-shaped indentations are at atmospheric pressure.
A sound-absorbing building component for indoor paneling, comprising:
- (a) a first sound-absorbing synthetic resin sheet 0.05 to 1 mm in thickness having a plurality of cup-shaped indentations lying side-by-side in a grid pattern, each of said cup-shaped indentations having a height of from 1 cm to 10 cm and each of said cup-shaped indentations including (1) a planar bottom wall having a surface area of 10 cm.sup.2 to 225 cm.sup.2 to be exposed to an acoustic field during installation, said bottom wall being excitable to a plurality of natural vibrations upon the incidence of sound at a plurality of frequencies and (2) a plurality of generally planar sidewalls which are also excitable to natural vibrations;
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- (b) a planar second sheet covering the upper rims of the cup-shaped indentations, wherein the air volumes contained in the individual cup-shaped indentations are at atmospheric pressure.
A lightweight sound-absorbing building component for indoor paneling, comprising:
- (a) a first synthetic resin sheet having a plurality of cup-shaped indentations arranged in a grid pattern, each of said cup-shaped indentations including a generally planar bottom wall having an area of between about 10 cm.sup.2 and 225 cm.sup.2 which are excitable to a plurality of natural vibrations upon the incidence of sound having a frequency of about 100 to about 5000 H.sub.z and a plurality of generally planar sidewalls which are also excitable to natural vibrations;
- and
- (b) a second planar synthetic resin sheet covering the upper rims of said cup-shaped indentations to form a plurality of atmospheric pressure air volumes corresponding to the individual cup-shaped indentations, wherein the bottom surfaces, the lateral surfaces and the cup-shaped indentations as a whole are excited to natural vibrations on the incidence of sound to contribute toward the absorbance of sound energy to obtain a degree of sound absorption extensively independent of the frequency in order to reduce with maximum uniformity the entire noise level in the interior rooms.
Dependencies are inferred from the claim text.