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Publication numberUS20020117351 A1
Publication typeApplication
Application numberUS 09/799,383
Publication dateAug 29, 2002
Filing dateFeb 27, 2001
Priority dateFeb 27, 2001
Publication number09799383, 799383, US 2002/0117351 A1, US 2002/117351 A1, US 20020117351 A1, US 20020117351A1, US 2002117351 A1, US 2002117351A1, US-A1-20020117351, US-A1-2002117351, US2002/0117351A1, US2002/117351A1, US20020117351 A1, US20020117351A1, US2002117351 A1, US2002117351A1
InventorsHung-Lieh Chen
Original AssigneeHung-Lieh Chen
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Sound-eliminating board
US 20020117351 A1
Abstract
A sound-eliminating board including sequentially bonded sound transmissible top layer, rigid sound-eliminating middle layer, and elastic sound-eliminating bottom layer. The sound transmissible top layer allows sound waves to penetrate through it into the rigid sound-eliminating middle layer, which includes a plurality of checkered partitions to define a plurality of open-topped small compartments. Sound waves penetrated into the rigid sound-eliminating middle layer reflect repeatedly in the small compartments to result in energy dispersion and counterbalanced energy due to overlapped amplitude of reflected sound waves, and are finally eliminated. In case of any residual low-frequency sound waves that penetrate through the rigid sound-eliminating middle layer into the elastic sound-eliminating bottom layer, they are further eliminated in the bottom layer.
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Claims(6)
What is claimed is:
1. A sound-eliminating board comprising a sound transmissible first layer and a rigid sound-eliminating second layer bonded together to form an integral unit; said sound transmissible first layer being a decorative layer permitting sound waves to penetrate through it into said rigid sound-eliminating second layer, and said rigid sound-eliminating second layer including a plurality of checkered partitions that together define a plurality of small and open-topped sound-eliminating compartments on said second layer.
2. The sound-eliminating board as claimed in claim 1, wherein said sound transmissible first layer is made of a rigid material and provided with a plurality of densely distributed tiny holes.
3. The sound-eliminating board as claimed in claim 1, wherein said sound transmissible first layer is made of gas-permeable non-woven fabrics.
4. The sound-eliminating board as claimed in claim 1, wherein said sound-eliminating compartments on said rigid sound-eliminating second layer have a uniform depth.
5. The sound-eliminating board as claimed in claim 1, wherein said sound-eliminating compartments on said rigid sound-eliminating second layer have different depths in randomly assigned areas.
6. The sound-eliminating board as claimed in claim 1, further comprising an elastic sound-eliminating third layer bonded to a lower side of said rigid sound-eliminating second layer opposite to said first layer, and said elastic sound-eliminating third layer including a plurality of densely distributed internal pores.
Description
    BACKGROUND OF THE INVENTION
  • [0001]
    The present invention relates to a sound-eliminating board capable of thoroughly capturing noises and internally repeatedly reflecting sound waves penetrated thereinto to finally eliminate the sound waves through energy dispersion, overlapped amplitude, and counterbalanced energy of the sound waves. Any low-frequency sound waves are also absorbed in an elastic and porous layer of the sound-eliminating board.
  • [0002]
    Noises do harm to a person's eardrum and have negative influences on the mental and physical conditions of a person who works or lives in a noisy environment for a prolonged time. Unfortunately, there are so many noise sources in our living environment, such as stereophonic equipment, traffic equipment, machinery in plants, construction sites, etc., that many people are constantly and seriously harmed by noises.
  • [0003]
    There are many commercially available products designed to protect people against noises, such as noise barrier shields erected at two sides of overhead roads to isolate noises by forcing noise waves to reflect from the barrier shields, and sound-eliminating boards made of soft fibrous material for use indoors. It is known that when a sound wave meets some barrier, a part of the sound wave penetrates through the barrier while others reflect or diffract. Factors that determine a penetrating power of a sound wave include physical properties of the barrier and a frequency of the sound wave. Given the physical properties of a barrier are fixed, the lower the frequency of a sound wave is, the higher the penetrating power of the sound wave is. Generally, a soft sound-absorbing material is not able to completely absorb sound waves. And, the rigid noise barrier shield does not absorb sound waves but reflects and diffracts them, and part of the reflected and diffracted sound waves propagate at a height over the barrier.
  • SUMMARY OF THE INVENTION
  • [0004]
    A primary object of the present invention is to provide a sound-eliminating board that is able to treat sound waves of different frequencies and can therefore be used indoors and outdoors to thoroughly absorb sound waves and achieve the purpose of eliminating sound.
  • [0005]
    To achieve the above and other objects, the sound-eliminating board of the present invention mainly includes a sound transmissible top layer, a rigid sound-eliminating middle layer, and an elastic sound-eliminating bottom layer being sequentially bonded into an integral unit. The sound transmissible top layer allows sound waves to penetrate into the rigid sound-eliminating middle layer, which includes a plurality of checkered partitions to define a plurality of open-topped small compartments. Sound waves penetrated into the rigid sound-eliminating middle layer reflect repeatedly in the small compartments to result in energy dispersion and counterbalanced energy due to overlapped amplitude of the reflected sound waves, and are finally eliminated. In case of any residual low-frequency sound waves that penetrate through the rigid sound-eliminating middle layer into the elastic sound-eliminating bottom layer, they are further absorbed in the bottom layer.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0006]
    The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein
  • [0007]
    [0007]FIG. 1 is a perspective of a sound-eliminating board according to the present invention;
  • [0008]
    [0008]FIG. 2 is an exploded perspective of the sound-eliminating board of FIG. 1;
  • [0009]
    [0009]FIG. 3 is a sectional view of the sound-eliminating board of FIG. 1;
  • [0010]
    [0010]FIG. 4 is an enlarged view of the encircled area of FIG. 3; and
  • [0011]
    [0011]FIG. 5 is a perspective of a sound-eliminating board according to another embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • [0012]
    Please refer to FIGS. 1, 2 and 3 in which a sound-eliminating board 10 according to the present invention is shown. The sound-eliminating board 10 mainly includes a sound transmissible top layer 11, a rigid sound-eliminating middle layer 12, and an elastic sound-eliminating bottom layer 13. These three layers 11, 12, 13 are sequentially bonded together to form an integral unit.
  • [0013]
    The sound transmissible top layer 11 is a decorative layer permitting sound waves to pass through it into the rigid sound-eliminating middle layer 12. When the sound-eliminating board 10 is used outdoors, the top layer 11 may be made of a rigid material and provided with densely distributed tiny holes 17. And, when the sound-eliminating board 10 is used indoors, the top layer 11 may be made of the above-described rigid material with a plurality of tiny holes 17 or a gas-permeable soft material, such as non-woven fabrics (not shown).
  • [0014]
    The rigid sound-eliminating middle layer 12 includes a plurality of checkered partitions 14 that together define a plurality of small and open-topped sound-eliminating compartments 15 on the middle layer 12. When a sound wave enters the sound-eliminating middle layer 12, it reflects many times in the sound-eliminating compartments 15, resulting in energy dispersion of the penetrated sound. Moreover, reflected sound waves in the sound-eliminating middle layer 12 create an effect of overlapped amplitude of sound wave, resulting in counterbalanced sound energy. That is, the sound is eliminated. The sound-eliminating compartments 15 may be designed to have a depth within a range from 1 to 5 cm. When the sound-eliminating compartments 15 have an increased depth, they are more effective in eliminating a sound of high decibel. And, sound-eliminating compartments 15 having reduced depth are more effective in eliminating a sound of low decibel. The sound-eliminating compartments 15 on the rigid sound-eliminating middle layer 12 may have a uniform depth or have different depths in randomly assigned areas, depending on actual condition of sounds in a place where sounds are to be eliminated.
  • [0015]
    The elastic sound-eliminating bottom layer 13 is made of an elastic material having densely distributed pores 16 therein. When sound waves propagate among the pores 16, sound energy of these sound waves is absorbed in the elastic sound-eliminating bottom layer 13. Sound waves that penetrate the elastic sound-eliminating bottom layer 13 are low-frequency sound waves capable of penetrating through the rigid sound-eliminating middle layer 12. When the low-frequency sound waves penetrate into the elastic sound-eliminating bottom layer 13, they collide with one another in the pores 16 repeatedly to result in changed frequency of sound waves and weakened sound energy. The elastic sound-eliminating bottom layer 13 finally absorbs residual sound waves and eliminates sound. An example of forming the sound-eliminating bottom layer 13 is to compress and thereby mold rubber granules, and pores 16 naturally form among the compressed and molded granulated rubber.
  • [0016]
    The sound-eliminating board of the present invention is characterized in the rigid sound-eliminating middle layer 12, in which sound waves reflect repeatedly to result in overlapped amplitude of sound waves and counterbalanced sound energy to effectively eliminate the sound.
  • [0017]
    In another embodiment of the present invention, it is possible to produce a sound-eliminating board 10′ that includes only the sound transmissible top layer 11 and the rigid sound-eliminating layer 12, as shown in FIG. 5, for use at a location where no low-frequency sound wave exists.
  • [0018]
    With the above-described structure, the rigid middle layer 12 and the elastic bottom layer 13 of the sound-eliminating board of the present invention are able to eliminate high-frequency and low-frequency sound waves, respectively, making the present invention an excellent sound absorption material.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7484589 *Mar 4, 2004Feb 3, 2009The Boeing CompanyApparatus and method for reducing aircraft noise and acoustic fatigue
US8727071 *Jun 22, 2010May 20, 20143M Innovative Properties CompanySound barrier for audible acoustic frequency management
US20050194205 *Mar 4, 2004Sep 8, 2005Yueping GuoApparatus and method for reducing aircraft noise and acoustic fatigue
US20050211500 *Mar 26, 2004Sep 29, 2005Wendt Alan CFibrous faced ceiling panel
US20070209867 *Apr 6, 2007Sep 13, 2007Jin Suk KimSoundproof panel for impact sound insulation
US20080230308 *Oct 31, 2007Sep 25, 2008Arndt SteinerDecorative acoustic absorber forming a wall element
US20120090916 *Jun 22, 2010Apr 19, 2012Ali BerkerSound barrier for audible acoustic frequency management
US20120111664 *May 4, 2010May 10, 2012Z-Bloc International AbAcoustic shielding device for damping of disturbing traffic noise
US20150267401 *Sep 16, 2013Sep 24, 2015Hp Pelzer Holding GmbhMultilayered perforated sound absorber
DE202004018241U1 *Nov 24, 2004Apr 6, 2006Fritz Egger Gmbh & CoDeckschicht und Paneel mit schallabsorbierenden Eigenschaften
EP1657374A2 *Nov 7, 2005May 17, 2006General Electric CompanyThermal - Acoustic enclosure
EP1657374A3 *Nov 7, 2005Sep 12, 2007General Electric CompanyThermal - Acoustic enclosure
EP2141297A1 *Jul 2, 2009Jan 6, 2010Jean-Paul BaillySelf-supporting acoustic insulation wall
WO2005094317A2 *Mar 25, 2005Oct 13, 2005Usg Interiors, Inc.Fibrous faced ceiling panel
WO2005094317A3 *Mar 25, 2005Nov 16, 2006Usg Interiors IncFibrous faced ceiling panel
Classifications
U.S. Classification181/292, 181/290
International ClassificationE04B1/86, E04B1/74, E04B1/84
Cooperative ClassificationA47B2220/13, E04B2001/8485, E04B1/86, E04B2001/8461, E04B2001/748
European ClassificationE04B1/86