200846527 九、發明說明： 【發明所屬之技術領域】 本發明係有關於一種複合聲波吸收結構，特別是指能大幅 提升結構對於聲波能量的吸收能力，達到兼具機械補強及聲波 吸收之多功能複合體效果’同時藉以達到製程簡化、低頻吸音 率高、吸音頻域寬、重量輕的優點，可廣泛應用於高性能高科 技廠房、電子或光學設備、測量儀器、建築隔間、商業大樓、 f 或辦公設備上，具有極大之市場潛力，有助於整體產業中下游 之競爭力。 【先前技術】 聲音係為振動表面產生之機械能，經由物質週期性之壓 縮與稀疏分子而傳播，聲音可藉由氣體、液體與固體傳播，其 振動源產生之聲音具有魏量輸出，聲音產生音壓之交互變 化，由壓縮時最大逐漸下降，至稀疏時最小。 近年來環保麵抬頭’而噪音是繼空氣污染、水源污毕 之後的第三大魏公#，如崎録音的產从齡重要的課 題，其中「吸音」為料防止手段之―，主要阻止聲音之 反射與折射’ __齡雜量以降低其絲，因此如何達 到佳的吸音效果衍然成為業界長期研究的方向。 据知具有吸音之結構’如美國第4, 942, _號專利所 揭路-觀動麵構聲音贿讀合_，Μ祕由高分子 200846527 /· 黏彈性中間層黏接膠合數層片鋼之非彈性材料組成，且各層材 料均具有不同厚度，其中各層黏彈性中間層之減衰區間或軟化 區間位於不同的使用溫度區間，使的黏彈性中間層具有不同的 減哀區間，同時於此複合材料之外表面披覆聲音吸收材料。 另，於美國第5, 539,163號專利則揭露有一種道路用隔音 牆板，係由多個支撐柱及多個三明治板構成，三明治的中央板200846527 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a composite acoustic wave absorbing structure, in particular to a multi-functional composite capable of greatly enhancing the absorption capacity of a structure for sound energy and achieving both mechanical reinforcement and sound absorption. The body effect is also used to achieve the advantages of simplified process, high frequency sound absorption, wide audio field and light weight. It can be widely used in high-performance high-tech workshops, electronic or optical equipment, measuring instruments, building compartments, commercial buildings, f Or office equipment, has great market potential, and contributes to the competitiveness of the industry in the middle and lower reaches of the industry. [Prior Art] The sound is the mechanical energy generated by the vibrating surface, which is propagated through periodic compression and sparse molecules. The sound can be transmitted by gas, liquid and solid. The sound generated by the vibration source has a Wei output and sound generation. The interaction of sound pressure changes from the maximum gradually decreasing during compression to the smallest when sparse. In recent years, the environmental protection has risen, and the noise is the third largest Weigong # after the air pollution and water pollution. The Rizaki recording is an important issue of ageing, in which "sound absorption" is the means of prevention, mainly preventing sound. The reflection and refraction ' _ _ age of impurities to reduce its silk, so how to achieve good sound absorption has become the direction of long-term research in the industry. It is known that there is a sound-absorbing structure. For example, the United States No. 4, 942, _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The non-elastic material composition, and each layer material has different thicknesses, wherein the fading interval or softening interval of each layer of the viscoelastic intermediate layer is located in different use temperature intervals, so that the viscoelastic intermediate layer has different mitigation intervals, and at the same time The outer surface of the material is covered with a sound absorbing material. In addition, U.S. Patent No. 5,539,163 discloses a soundproofing wall panel for a road, which is composed of a plurality of support columns and a plurality of sandwich panels, and a central panel of the sandwich.
由Durisol.TM木材混凝土（woodconcrete)構成，其中第一 < 層外板及第二層外板分別位於中央板二邊對面，由Durisol. TM 木材混凝土構成相鄰各層間並有泥漿幕層，此隔音牆三明治板 並含有地工織物加強，厚度為2· 75〜7· 0英吋，每平方呎重量 為18〜40磅，聲波穿透損失28dB。 更有一種吸音板結構，如國内第88218728號所揭露之「複 合式吸音板」新型專利，其包括有：一多孔吸音板，為一種平 直片狀的薄板，具有多個貫穿孔，可供聲波穿過該貫穿孔； 一多孔性複合吸音材料，設於該多孔吸音板之後方，與該多孔 吸音板平行並且保持有一距離，藉由該距離與該多孔吸音板之 間形成一空氣層，用於吸收中/高頻範圍之噪音；以及一結構 層’介於該多孔吸音板與該多孔性複合吸音材料之間，其結構 縱深即為該空氣層之厚度，該結構層包括有複數片結構板，該 結構板在該多孔吸音板之貫穿孔的背面形成複數個彼此相依 的主共振腔與次共振腔，以及連通該貫穿孔與該多孔性複合吸 音材料的連通空隙，用於吸收低頻範圍之噪音。 6 200846527 【發明内容】（所欲解決之技術問題） 惟’上述習知技術其聲波屏蔽材娜賊維❹孔洞的 材料’以及厚重金屬材f ’僅能針對中高頻等特定頻段產生屏 蔽效果’對500Hz以下之低頻嘱音極為有限，而且其厚度盘重 量往往均造成空壯與細上的不便，如現代化工業產品、電 腦、雜、醫賴1、高科鍵築物料，絲需要於吸音要 求必需含括至低頻聲波，因此設計研發具寬領域聲波屏蔽特性 ( 及具吸收效果之複合材料需求，亟為孔急。 (解決問題之技術手段） 有紐此，本發明所揭露之複合聲波吸收結構，其包含至 少-多層型態複合聲波吸收構造，該多層型態複合結構是由多 孔性面材、混成纖維複合材料、及發泡體等材質，以適當層疊 型祕造所組成’其中該複合聲波吸收結構係包含一複合層及 -面材層，其中該複合層_板如狀之—發泡體，及與混成 纖維複合材料組成之該複合層結合，利用各該面材層及複合層 之黏滯組尼雜魄4衰減效應，_紐賴麟波吸收能 力’並兼具機械觀及聲波吸收之多魏複合體效果，同時可 解決習知吸音結構之空間及重量等問題。 (對照先前技術之功效） 本發批主要目_卩在提供-織合較吸收麟，係可 大提升多層板型態結構的聲波損失之能力，並達到兼具機械 7 200846527 補牆及聲波吸收之雙重功能。 本發目_卩在提供—纖合聲波魏結構， 決傳統僅能針對特定頻^^ /、解 產生屏蔽，以及重量與空間之M 係具有簡化製程、低頻吸立iA 门之問碭， 有重量輕之特性。‘、吸音韻寬等特性，同時具 本發把再目卿在提供—種複合較吸 用範圍廣，可實施於高性能古 霉其可應 回科技廠房、建柴隔間、商章 辦公設備、或精密儀哭μ 4杀穴樓、 猾在儀器上’具有極大之市場潛力。 【實施方式】 f先请參照第-圖至第三圖，本發賴提供之—種複合聲波 吸收結構，其主要包含有：一面材層⑽，及以層疊方式設於 該面材層（10)下方之一複合層（20)。 、 該面材層（10)，係係由鋼材、鋁合金構成表面呈均勻分佈 之多孔狀，®示巾則叫巢狀作為實施雜，藉以有效使聲波 產生繞射’以使消耗共鳴頻率區之聲能吸收。 該複合層（20)，其具有發泡材質之二第一疊層（21)以及至 少二種纖維複合材質混成之一第二疊層（22)，其中該第二疊層 (22)夾設於各該第一疊層（21)間呈三明治多層疊置狀，可有效 提供黏滯阻尼彈性能量之衰減效應；該複合層（2Q)係由唆纖 維、玻璃纖維、克維拉纖維等與熱可塑性樹脂及熱固性樹脂組 合而成者；其應用之克維拉纖維係由一芳香族聚醯胺纖維編織 而成；其應用之熱固性樹脂中的樹脂包括環氧樹脂或不飽和聚 8 200846527 ·' 冑；進—步說明者，各該第一疊層（21)係由聚氨基甲酸醋、聚 鼠乙烯、聚乙烯及聚酯等黏彈性材料發泡構成，且可分別呈 不同厚度者。 藉由上述構件’利用該複合層（2〇)其纖維或該面材層⑽ 其孔洞間轉擦與收縮擴大，將聲能觀為舰，使聲音能量 降低；以及藉材料内部的阻尼，降低機械或聲音引起的振動里 消散聲波能量，而達到減低音量的效果。 、為供進-步瞭解本發明構造特徵、運用技術手段及所職 達成之功效，兹將本拥·方式加讀述如下： 本發明主要係以高分子_體其内夾設纖維複合材料層所 33=治阻尼彈性結構，係由纖維複合材料層受到聲能 艇塞振盪，魅聲波共振與能量雜，可有效提升聲 难=的吸收力，此外’本發明之纖維複合材料層係屬 =當受到聲波撞擊時產生彎曲變形，藉由該複合材料内部的 =尼，可降低聲音所引起的振動，消散低頻聲波能量，以 量的絲，·骑，_高分子發_材孔洞間 小^擴大’將聲能轉變為熱能，使聲音能量降低，減 =聲曰之反射與折射；配合纽面材·，可進 凌繞射，消耗共鳴頻率區之聲能。 有使耳 播岳i j=夕孔吸日與遲雜尼常被應用作$吸音之聲波控 反覆==月藉由材料内部的多孔性構造，讓聲波於孔隙中 膨脹，使聲能於孔壁上摩擦後轉換成熱能而散 S曰以八備_耗因子混成之該纖維複合材料其本身擁有 9 200846527 二 的遲滯阻尼特性，可消散材料產生彎曲波動變形，將其表面振 動引起之噪音與振動能量轉化成熱能。 若視聲音的特性進一步分析，多孔與纖維材質較適於中 頻、高頻吸音，開孔板材則適用於共鳴頻率區之吸音，實心板 材則適用於低頻域吸音；本發明結合多孔性面材、具黏滯組尼 效果之混成齡複合祕、以及多孔發泡猶具縣聲波衰減 性功犯之吸音複合材料，以層層疊置型態所共同組成之聲波吸 ( 音結構，制時具有多孔繞射&消耗聲能、黏舰尼的能量減 衰特性，以及在低、寬頻域聲波等不同領域之吸收能力，產生 聲波共振魏量消耗，減少聲能強度，強化吸音效果，以達到 聲波控制目的，並大幅提升多層板型態結構的聲波損失之能 力’尤其整體結構係具彈性，適當設置於機械或儀器具有衝擊 力及產生音源之部位，則又可作為兼具機械補強及聲波吸收之 雙重功能複合體結構。 本發明之複合聲波吸收結構厚度約8〇刪，依照 與CNS906迴響室法執行吸音率測定，將本發明試片置於迴響室 地板上所測得數據請參照第四圖，250Hz處吸音率為0·73、 1〇_Z處吸音率為〇· 96、2000Hz處吸音率為〇· 99 ;將四個頻 帶中心頻率250Hz、500Hz、1000Hz、2000Hz處吸音率的平均質 定義為噪音衰減數值（NRC，Noise Reducti〇n c〇efficient); 而本發明之噪音衰減係數值（NRC)為〇· 81，第四圖顯示不同頻 率對吸音率之曲線圖。 另將本發明試片置放於離地面上20cm測地時，可測得數據 200846527 …明參照第五圖，25〇hz低音域吸音率為0· 85、5_z處吸音率為 =、1_Z處吸音率為1 G7、2_z處吸音率為h 〇9 ;噪 曰衷減係數值（Nrc)為〇· 98 ’第五醜示不同頻率對吸音率之 曲線圖。 令知月以夕層式览|^結合多孔性面材、具黏滯組尼效果之 混成=維複合材料、以及多孔發泡體等具特殊聲波衰減性功能 之吸日複口材料’係可大幅降低聲波能量；相較傳統聲波屏蔽 ( 材料知用纖維、多孔材料、或厚重金屬材質之技術以致產生厚 度及重量等空間問題，同時，本發明更具有製程簡化、低頻吸 音率高、吸音頻域寬、以及重量輕等優點。 無論習知結構以高分子黏彈性巾間層以膠合黏#數層鋼片 之構成’或者以多個支撐柱配合DurisolTM木材混凝土（職^ concrete)構成，亦或是利用共振腔及多孔____ 之吸音結構’其結構上、技術上及獅應壯均未見如本發明 (^揭露之發泡職纽材質，結合混成纽_複合材質以層 «式所構成之整體結構，於功效上習知技術其吸音率、聲波能 I消耗性、以及低頻吸音性均無法達到如本發明所揭者。 请參照第四圖’係為本發明另一實施例，其進一步包含有 -阻尼片（30) ’係黏貼設置於該面材層〇〇)表面者；係提供整 體結構於聲波阻尼效果之強化。 綜合上述，本發明所揭露之「複合聲波吸收結構」，係提供 -種具結合多孔性面材、具黏滞組尼效果之混成纖維複合材 料、以及多孔發泡體等具特殊聲波衰減性功能之吸音複合材 11 200846527 料’藉以大幅提升多層板型態結構的聲波損失之能力，並達到 =具機械補牆及聲波魏之雙重械，而獲致—實祕高之吸 。構俾使整體確具產業實用性及成本效益，且其構成結構 曰見於諸書刊或公開使用，誠符合新型專彳!請要件，銀 請/局日膝，早日准予補，至域禱。 ^ 二^明ί’社所述^是本創作之·實施瓶所運用之技術 未起^依本創作之構想所作之改變，其所產生之功能作用仍 内’D人及圖式所涵蓋之精神時，均應在本創作之範圍 12 200846527 [圖式簡單說明】 第一圖為本發明一較佳實施例之立體外觀圖。 第二圖為本發明一較佳實施例之局部放大圖。 第三圖為本發明一較佳實施例之剖視組合示意圖。 第四圖為本發明另一實施例之剖視組合示意圖。 【主要元件符號說明】 [本創作] 面材層 複合層 第一疊層 \—/ \)/ N). ο ο 1 12 2 Γ\ /^\ X^\ 第二疊層 （22) 阻尼片 （30) 13It consists of Durisol.TM woodconcrete, in which the first < outer layer and the second outer layer are respectively located on opposite sides of the central plate, and Durisol. TM wood concrete is formed between adjacent layers and has a mud curtain layer. This soundproof wall sandwich panel is reinforced with a geotextile, with a thickness of 2·75 to 7·0 inches, a weight of 18 to 40 pounds per square inch, and a sound wave penetration loss of 28 dB. There is also a sound absorbing panel structure, such as the new patent of "composite sound absorbing panel" disclosed in No. 88,821, 788, which comprises: a porous sound absorbing panel, which is a flat sheet-like thin plate having a plurality of through holes. Providing sound waves through the through hole; a porous composite sound absorbing material disposed behind the porous sound absorbing panel, parallel to the porous sound absorbing panel and maintaining a distance by which a distance is formed between the porous sound absorbing panel and the porous sound absorbing panel An air layer for absorbing noise in the medium/high frequency range; and a structural layer between the porous sound absorbing panel and the porous composite sound absorbing material, the structural depth being the thickness of the air layer, the structural layer comprising a plurality of structural plates having a plurality of mutually adjacent primary and secondary resonant cavities on a back surface of the through hole of the porous sound absorbing plate, and a communication gap connecting the through holes and the porous composite sound absorbing material To absorb noise in the low frequency range. 6 200846527 [Summary of the Invention] (The technical problem to be solved) Only the above-mentioned conventional technology, the material of the acoustic shielding material, the material of the thief, and the heavy metal material f' can only produce shielding effects for specific frequency bands such as medium and high frequency. Low-frequency arpeggios below 500 Hz are extremely limited, and the thickness of the thickness of the disk often causes inconveniences such as modern industrial products, computers, miscellaneous, medical, and high-tech key materials. The wire needs to be required for sound absorption. Including the low-frequency sound waves, so the design and development of wide-area acoustic wave shielding characteristics (and the demand for composite materials with absorption effect, which is a hole in the hole. (Technical means to solve the problem), this is the composite acoustic wave absorption structure disclosed by the present invention. And comprising at least a multi-layered composite acoustic wave absorbing structure composed of a porous surface material, a hybrid fiber composite material, and a foam material, and composed of a suitable laminated type of secret composition The acoustic wave absorbing structure comprises a composite layer and a face material layer, wherein the composite layer _ plate is like a foam, and is compounded with the mixed fiber The composite layer of the material composition is combined, and the viscous group of the surface layer and the composite layer is used for the attenuation effect of the niobium 4, the absorption capacity of the _New Zealand lining wave, and the effect of the mechanical and acoustic absorption of the multi-Wei complex, It can solve the problems of the space and weight of the conventional sound absorbing structure. (Compared with the efficacy of the prior art) The main purpose of this batch is to provide the ability to increase the sound wave loss of the multi-layer plate structure. And achieve the dual function of the mechanical 7 200846527 fill wall and sound wave absorption. This hair _ 卩 is providing - fibrillation sound wave Wei structure, the tradition can only produce shielding for specific frequency ^ ^ /, solution, and weight and space The M system has a simplified process, low-frequency suction iA door, and has the characteristics of light weight. ', sound absorption and other characteristics, and the hair is also available in the same way. Implemented in high-performance ancient mold, it can be returned to the technology factory, Jianchai compartment, Shangzhang office equipment, or precision instrument crying μ 4 killing floor, 猾 on the instrument 'has great market potential. 【Embodiment】 f first Please refer to The first to third figures, the composite acoustic wave absorbing structure provided by the present invention, mainly comprises: a one-layer layer (10), and a composite layer (20) disposed under the surface layer (10) in a stacked manner (20) The surface layer (10) is made of steel and aluminum alloy, and the surface of the surface layer is evenly distributed. The towel is called a nest, which is used as a dummy to effectively make the sound wave diffracted to resonate. Acoustic energy absorption in the frequency region. The composite layer (20) has a first laminate (21) of foamed material and a second laminate (22) of at least two fiber composite materials, wherein the second layer The laminate (22) is sandwiched between each of the first laminates (21) and is sandwiched and arranged to effectively provide an absorbing effect of viscous damping elastic energy; the composite layer (2Q) is made of rayon fiber and glass fiber. , Kewei fiber and the like combined with thermoplastic resin and thermosetting resin; the application of the Kewei fiber is woven from an aromatic polyamide fiber; the resin used in the thermosetting resin includes epoxy resin Or unsaturated poly 8 200846527 ·' 胄; Out by each of the first stack (21) is comprised of the polyurethane vinegar, polyethylene murine ethylene, polyethylene, polyester and the like viscoelastic material foam, and may be in different thicknesses were, respectively. By using the above-mentioned member 'utilizing the composite layer (2〇) its fiber or the face material layer (10) to rotate and shrink between the holes, the sound energy is regarded as a ship, so that the sound energy is reduced; and the damping inside the material is reduced. The vibration caused by mechanical or sound dissipates the sound energy and achieves the effect of reducing the volume. In order to understand the structural features of the present invention, the technical means, and the functions achieved by the job, the present invention is described as follows: The present invention mainly relates to a polymer composite layer in which a polymer body is interposed. 33 = treatment damping elastic structure, the fiber composite material layer is oscillated by the acoustic energy boat, the fascinating sound wave resonance and energy miscellaneous, can effectively improve the absorption of sound difficulty =, in addition, the fiber composite layer of the invention belongs to When subjected to sound waves, bending deformation occurs. By the inside of the composite material, the vibration caused by the sound can be reduced, the low-frequency sound wave energy can be dissipated, and the amount of silk, the ride, the _ polymer hair _ material hole between the small ^ Enlarge the 'transformation of sound energy into heat energy, so that the sound energy is reduced, minus the reflection and refraction of the sonar; with the neon material, it can be rayed and consumes the sound energy of the resonance frequency zone. There are so-called ear yu ij = 夕 吸 吸 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日 日The fiber composite material which is converted into heat energy by friction and is mixed with the eight-time consumption factor has the hysteresis damping characteristic of 9 200846527 2, and the dissipative material generates bending wave deformation, and the noise and vibration caused by the surface vibration thereof Energy is converted into heat. If the characteristics of the sound are further analyzed, the porous and fiber materials are suitable for medium frequency and high frequency sound absorption, the apertured plate is suitable for sound absorption in the resonance frequency region, and the solid plate is suitable for sound absorption in the low frequency region; the invention combines the porous surface material The sound-absorbing composite material with the viscous grouping effect and the sound-absorbing composite material of the porous foaming judging sound wave attenuating scum, the acoustic wave composed of the layered stacked type (sound structure, the system is porous Diffraction & consumption of sound energy, the energy-reducing characteristics of the viscous, and the absorption capacity in different fields such as low-frequency and wide-frequency sound waves, resulting in the consumption of acoustic resonance, reducing the intensity of sound energy, and enhancing the sound absorption effect to achieve sound wave control. The purpose, and greatly improve the ability of the sound wave loss of the multi-layer plate type structure, especially the overall structural structure is elastic, suitable for the mechanical or instrumental impact and sound source, it can also be used as both mechanical reinforcement and sound absorption. The dual-function composite structure. The composite acoustic wave absorbing structure of the present invention has a thickness of about 8 〇, and is absorbing sound according to the CNS906 reverberation chamber method. For the measurement, please refer to the fourth figure for the data of the test piece placed on the reverberation floor. The sound absorption rate at 250 Hz is 0·73, and the sound absorption rate at 1〇_Z is 〇·96, 2000 Hz. · 99; The average quality of the sound absorption rate at the center frequency of the four frequency bands of 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz is defined as the noise attenuation value (NRC, Noise Reducti 〇nc〇efficient); and the noise attenuation coefficient value (NRC) of the present invention is 〇· 81, the fourth figure shows the plot of different frequency versus sound absorption rate. When the test piece of the invention is placed on the ground 20cm from the ground, the data can be measured 200846527 ... see the fifth picture, 25 〇hz low range The sound absorption rate is 0·85, the sound absorption rate at 5_z is =, the sound absorption rate at 1_Z is 1 G7, the sound absorption rate at 2_z is h 〇9; the noise reduction coefficient value (Nrc) is 〇·98 'the fifth ugly difference The graph of the frequency versus the sound absorption rate. The combination of the porous surface material, the viscous group effect, the composite material, and the porous foam have special sonic attenuation functions. The suction of the material of the day can greatly reduce the energy of the sound wave; compared to the traditional sound wave screen (The material knows the technology of fiber, porous material, or heavy metal material to cause space problems such as thickness and weight. At the same time, the invention has the advantages of simplified process, high frequency sound absorption, wide audio field, and light weight. The conventional structure is composed of a polymer viscoelastic inter-layer layer formed by gluing a plurality of layers of steel sheets or a plurality of supporting columns combined with DurisolTM wood concrete, or a resonant cavity and a porous body. The sound absorbing structure 'is structurally, technically and lion should not be seen as the invention (^ exposed the foaming material, combined with the composite _ composite material to form the overall structure of the layer, in terms of efficacy The technique of sound absorption, sonic energy I, and low frequency sound absorption cannot be achieved as disclosed in the present invention. Please refer to the fourth figure as another embodiment of the present invention, which further includes a surface of the damper sheet (30) that is attached to the surface layer of the surface layer; and provides an enhancement of the overall structure to the acoustic wave damping effect. . In summary, the "composite acoustic wave absorbing structure" disclosed in the present invention provides a special acoustic wave attenuating function such as a composite surface material, a hybrid fiber composite material having a viscous composition effect, and a porous foam body. The sound absorbing composite material 11 200846527 is expected to greatly improve the sound wave loss of the multi-layer plate type structure, and achieve the double mechanical function of the mechanical wall and the sound wave Wei, and the result is the absorption of the real high. The structure makes the whole industry practical and cost-effective, and its structure is seen in various books or public use, and it is in line with the new type of special! Please ask for details, silver, please, and the knees, as soon as possible, to the regional prayer. ^ The description of the ^^明ί's is the change of the technology used in the implementation of the bottle. The function of the creation is still covered by the 'D people and the schema. In spirit, it should be within the scope of this creation 12 200846527 [Simplified illustration of the drawings] The first figure is a perspective view of a preferred embodiment of the present invention. The second figure is a partial enlarged view of a preferred embodiment of the present invention. The third figure is a schematic cross-sectional view of a preferred embodiment of the present invention. The fourth figure is a schematic cross-sectional view of another embodiment of the present invention. [Main component symbol description] [This creation] The first laminate of the face layer composite layer \—/ \)/ N). ο ο 1 12 2 Γ\ /^\ X^\ Second laminate (22) Damping sheet (30) 13