JPH031458B2 - - Google Patents
Info
- Publication number
- JPH031458B2 JPH031458B2 JP61019758A JP1975886A JPH031458B2 JP H031458 B2 JPH031458 B2 JP H031458B2 JP 61019758 A JP61019758 A JP 61019758A JP 1975886 A JP1975886 A JP 1975886A JP H031458 B2 JPH031458 B2 JP H031458B2
- Authority
- JP
- Japan
- Prior art keywords
- tile
- plate part
- acoustic
- slit
- piece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000919 ceramic Substances 0.000 claims description 20
- 230000000630 rising effect Effects 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 description 17
- 230000000694 effects Effects 0.000 description 11
- 239000011491 glass wool Substances 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000002657 fibrous material Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000000835 fiber Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 102100027340 Slit homolog 2 protein Human genes 0.000 description 3
- 101710133576 Slit homolog 2 protein Proteins 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Landscapes
- Building Environments (AREA)
- Finishing Walls (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は音響タイルに関するものであり、詳し
くはスリツト構造をもつ音響タイルに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an acoustic tile, and more particularly to an acoustic tile having a slit structure.
［従来の技術］
従来、セラミツクス焼成品もしくはセメント類
等の硬質の素材からなるタイルに吸音効果をもた
せたものとしては、第５図、第６図に示すよう
に、グラスウール等の繊維を内部に充填した吸音
タイル又は吸音ブロツクが知られている。第５図
に示す吸音タイル１４は、略直方体形状であつ
て、内部に長手方向に延在する空洞部１５が形成
されている。そしてタイル１４の前面側には、こ
の空洞部１５を外部に連通するための貫通孔１６
が多数穿設されている。また、この空洞部１５に
はグラスウール等の繊維Ｗが充填されている。第
６図に示す吸音タイル１７は、同様に略直方体形
状の外形を有し、タイル短手方向に貫通する複数
個（図示の例では４個）の空洞部１５が設けられ
ている。そして各空洞部１５をタイル１７の前面
側に連通させるための貫通孔１６が複数穿設さ
れ、また、両側の空洞部１５を外部に連通するた
めのスリツト１８が設けられている。これら空洞
部１５には、グラスウール等の繊維Ｗが充填され
ている。[Prior Art] Conventionally, tiles made of fired ceramics or hard materials such as cement have been given a sound-absorbing effect by incorporating fibers such as glass wool inside them, as shown in Figures 5 and 6. Filled acoustic tiles or blocks are known. The sound-absorbing tile 14 shown in FIG. 5 has a substantially rectangular parallelepiped shape, and has a cavity 15 formed therein that extends in the longitudinal direction. On the front side of the tile 14, there is a through hole 16 for communicating this cavity 15 with the outside.
Many holes have been drilled. Further, this cavity 15 is filled with fibers W such as glass wool. The sound-absorbing tile 17 shown in FIG. 6 similarly has a substantially rectangular parallelepiped outer shape, and is provided with a plurality of cavities 15 (four in the illustrated example) passing through the tile in the lateral direction. A plurality of through holes 16 are provided to communicate each cavity 15 to the front side of the tile 17, and slits 18 are provided to communicate the cavities 15 on both sides to the outside. These cavities 15 are filled with fibers W such as glass wool.
［発明が解決しようとする問題点］
上記従来の吸音タイルや吸音ブロツクは、湿度
の高い場所や水が付着し易い箇所に施工すると、
グラスウール等の繊維材料Ｗが吸湿、吸水し、高
温域における吸音率の低下が生じる。そして、更
に繊維材料の含水量が増加すると、低音域及び中
音域での吸音率も低下するようになる。[Problems to be solved by the invention] When the conventional sound-absorbing tiles and sound-absorbing blocks described above are installed in areas with high humidity or where water easily adheres,
The fiber material W such as glass wool absorbs moisture and water, resulting in a decrease in sound absorption coefficient in a high temperature range. Further, as the water content of the fiber material increases, the sound absorption coefficient in the low and middle ranges also decreases.
とりわけ、グラスウールは保水性がよく、１度
吸水した水は容易には抜け出ず、多少の乾燥等の
処理を施しても、吸湿、吸水の影響は長期間に亙
つて解消することができなかつた。 In particular, glass wool has good water retention properties, and once water is absorbed, it does not escape easily, and even after some drying and other treatments, the effects of moisture absorption and water absorption cannot be eliminated for a long period of time. .
また、従来の吸音タイルやブロツクにおいて
は、気流や圧力変動により繊維が飛散し、これに
より繊維材料が次第に減少し吸音率が低下する恐
れもあつた。加えて、グラスウール等の繊維材料
は、タイルやブロツクの空洞部に充填する際に飛
散し易く、製造時の作業環境を悪化し易いという
問題もあつた。 Furthermore, in conventional sound-absorbing tiles and blocks, there was a risk that the fibers would be scattered due to air currents and pressure fluctuations, which would gradually reduce the fiber material and reduce the sound absorption coefficient. In addition, fiber materials such as glass wool tend to scatter when filled into the cavities of tiles and blocks, resulting in a problem in that they tend to deteriorate the working environment during manufacturing.
［問題点を解決するための手段］
本発明の音響タイルは、角筒形状を有する硬質
タイル本体の一側面にスリツトを形成し、このス
リツトの両縁部を筒内側に延出させ平行な片部を
形成する。更に、これら片部の筒内側の端部に多
孔質セラミツクを配し、これによつてスリツト奥
部を封塞せしめてなることを特徴とする。[Means for Solving the Problems] The acoustic tile of the present invention has a slit formed on one side of the rigid tile main body having a rectangular cylinder shape, and both edges of the slit extend toward the inside of the cylinder to form parallel pieces. form a section. A further feature is that porous ceramic is placed at the ends of these pieces on the inside of the cylinder, thereby sealing the inner part of the slit.
また、本発明の音響タイルは、このような音響
タイルをスリツト中央から２分した構成のもので
あつて、２個を組み合わせることにより上記と同
様の音響タイルとなる半割体としたものである。 Further, the acoustic tile of the present invention has a configuration in which such an acoustic tile is divided into two from the center of the slit, and when the two pieces are combined, the same acoustic tile as described above is obtained. .
［作用］
本発明の音響タイルは、平行な片部で囲まれた
スリツトと、内部に形成された空洞部とを有する
ものであり、この空洞部の大きさ或いはスリツト
幅等を種々選択することにより、所望の吸音共鳴
周波数を得ることができる。[Function] The acoustic tile of the present invention has a slit surrounded by parallel pieces and a cavity formed inside, and the size of the cavity, the width of the slit, etc. can be variously selected. Accordingly, a desired sound absorption resonance frequency can be obtained.
また、吸音効果を有する多孔質セラミツクをス
リツトの奥部に配したので、スリツト及び空洞部
による吸音効果と多孔質材による吸音効果とが相
乗して発揮される。さらに、本発明の音響タイル
は、繊維材料を内蔵していないものであり、湿潤
雰囲気にある屋内プール等の室内音響設計等に好
適に使用することが可能である。 Furthermore, since the porous ceramic having a sound-absorbing effect is disposed deep within the slit, the sound-absorbing effect of the slit and cavity and the sound-absorbing effect of the porous material are synergistically exhibited. Furthermore, the acoustic tile of the present invention does not contain a fiber material, and can be suitably used for indoor acoustic design of indoor pools and the like in humid atmospheres.
［実施例］
以下図面に示す実施例を参照して本発明につい
て更に詳細に説明する。[Examples] The present invention will be described in more detail below with reference to examples shown in the drawings.
第１図は本発明の実施例に係る音響タイルＡの
斜視図である。また第２図は縦断面図、第３図は
平面図である。 FIG. 1 is a perspective view of an acoustic tile A according to an embodiment of the present invention. Further, FIG. 2 is a longitudinal sectional view, and FIG. 3 is a plan view.
第１図ないし第３図において、符号１は角筒形
状の硬質タイル本体を示し、４側面のうち１側面
（以下この１側面を前面という）には、タイル本
体１の長手方向に延在するスリツト２が開口され
ている。このスリツト２の開口縁部は、タイル本
体１の内側に折り返されて延在する形状の片部
３，４とされており、これら片部３，４の奥部を
跨ぐように多孔質セラミツク５が接着剤等により
固着されている。 In FIGS. 1 to 3, reference numeral 1 indicates a rectangular tube-shaped hard tile body, and one of the four sides (hereinafter, this one side is referred to as the front side) has a wall extending in the longitudinal direction of the tile body 1. The slit 2 is open. The opening edges of this slit 2 are formed into pieces 3 and 4 that are folded back and extended inside the tile body 1, and a porous ceramic 5 is formed so as to straddle the deep parts of these pieces 3 and 4. is fixed with adhesive or the like.
また、タイル本体１の前面側と反対側の面（以
下これを背面という）には裏足６が複数条形成さ
れており、タイル本体１の壁面等への接着強度を
高めるよう構成されている。 In addition, a plurality of sole feet 6 are formed on the surface opposite to the front side of the tile body 1 (hereinafter referred to as the back surface), and is configured to increase the adhesive strength of the tile body 1 to the wall surface, etc. .
かかる構成の音響タイルＡにおいては、スリツ
ト２、多孔質タイル５及び内部の空洞部７の存在
により吸音作用が奏されるのであるが、空洞部７
の奥行ａ、幅ｂ、或いは片部３，４の突出長さ
ｄ、更には多孔質タイル５の材質、気孔率等を
種々調整選択することにより、所望の吸音共鳴周
波数を得ることができる。更に、多孔質セラミツ
ク５の材質、気孔率を選択することにより、この
吸音効果を増大させることが可能である。 In the acoustic tile A having such a configuration, a sound absorbing effect is achieved due to the presence of the slits 2, the porous tile 5, and the internal cavity 7.
A desired sound absorption resonance frequency can be obtained by variously adjusting and selecting the depth a, the width b, the protruding length d of the pieces 3 and 4, the material of the porous tile 5, the porosity, etc. Furthermore, by selecting the material and porosity of the porous ceramic 5, it is possible to increase this sound absorption effect.
そして、内部にグラスウール等の繊維材料が充
填されていないから、湿度の高い箇所或は水がか
かる箇所に施工しても、吸音特性が低下すること
がない。 Since the interior is not filled with a fiber material such as glass wool, the sound absorption properties will not deteriorate even if installed in a place with high humidity or a place exposed to water.
このような音響タイルＡは、第４図に示す如く
スリツト２に沿つて半割した形状の音響タイルＢ
を向かい合わせて２個組み合わせることによつて
も構成することができる。即ち、第４図の音響タ
イルＢは長方形状の側板部８と、この側板部８の
一方の長側片から立ち上がる背板部９と、他方の
長側辺から立ち上がる前板部１０と、この前板部
１０の側板部８と反対側の辺部から背板部９へ向
つて側板部８と平行に延出させた片部１１とを備
えた硬質タイル本体１２を有する。また、この音
響タイルＢは、この片部１１の自由辺側に固着さ
れた多孔質セラミツク１３を備えている。この前
板部１０の立ち上がり高さｈは背板部９の立ち上
がり高さh2よりも小さく、このh2とｈとの差によ
り、音響タイルＢを２個向かい合わせに組み合わ
せるときに、第１図ないし第３図に示す音響タイ
ルＡのスリツト部２が形成される。 Such an acoustic tile A is divided into two halves along the slit 2 as shown in FIG.
It can also be constructed by combining two pieces facing each other. That is, the acoustic tile B in FIG. 4 has a rectangular side plate 8, a back plate 9 rising from one long side of the side plate 8, a front plate 10 rising from the other long side, and a front plate 10 rising from the other long side. It has a hard tile body 12 including a side plate 8 of a front plate 10 and a piece 11 extending in parallel to the side plate 8 from the opposite side toward the back plate 9. The acoustic tile B also includes a porous ceramic 13 fixed to the free side of the piece 11. The rising height h of the front plate portion 10 is smaller than the rising height h 2 of the back plate portion 9, and due to the difference between h 2 and h, when two acoustic tiles B are combined facing each other, the first The slit portion 2 of the acoustic tile A shown in the figures through FIG. 3 is formed.
多孔質セラミツク１３は硬質タイル本体１２と
同長さを有しており、またその幅は片部１１の自
由辺部からはみ出すように片部１１の肉厚よりも
大きくとられている。この多孔質セラミツク１３
のはみ出し幅は、この多孔質セラミツク１３の側
面１３ａが背板部９の端面９ａと面一になるもの
である。従つて、この音響タイルＢを２個向かい
合わせにして組み合わせると、第１図ないし第３
図に示す音響タイルＡと全く同様の構成のものと
なる。なお背板部９の背面には裏足４が形成され
ている。 The porous ceramic 13 has the same length as the hard tile body 12, and its width is larger than the thickness of the piece 11 so that it protrudes from the free side of the piece 11. This porous ceramic 13
The protrusion width is such that the side surface 13a of the porous ceramic 13 is flush with the end surface 9a of the back plate portion 9. Therefore, when two of these acoustic tiles B are combined facing each other, the results shown in Figures 1 to 3 are obtained.
It has exactly the same configuration as the acoustic tile A shown in the figure. Note that sole feet 4 are formed on the back surface of the back plate portion 9.
本発明において、硬質タイル本体１，１２を構
成する素材としてはセラミツクス焼成品もしくは
セメント硬化体が好適である。また多孔質セラミ
ツクス５，１３としては気孔率が30〜60％とりわ
け30〜40％となるものであつて、気孔の平均径が
１〜500μｍとりわけ100〜300μｍ程度となるもの
が好適である。なお多孔質セラミツク５，１３の
材質それ自体としては通常のタイル等を製造する
に用いられる組成と同様のものでよいが、その他
アルミナ質、シリカ質、ジルコニア質等各種のセ
ラミツク材を用いることが可能である。 In the present invention, the material constituting the hard tile bodies 1, 12 is preferably fired ceramics or hardened cement. The porous ceramics 5 and 13 preferably have a porosity of 30 to 60%, particularly 30 to 40%, and an average diameter of pores of 1 to 500 μm, particularly 100 to 300 μm. The material of the porous ceramics 5 and 13 itself may be the same as that used for manufacturing ordinary tiles, but various other ceramic materials such as alumina, silica, and zirconia may also be used. It is possible.
次に、本発明の音響タイルＡについて残響室法
によつて測定した吸音率を第７図に示す。なお、
タイル寸法は第３図に示すａが10cm、ｂが10cm、
ｃが２cm、ｄが1.5cmであり、かつ硬質タイル本
体１の肉厚は1.5cm、多孔質セラミツク５の肉厚
は２cmである。また、硬質タイル本体１の材質は
磁器質であり、多孔質タイル５の材質は硬質タイ
ル本体１と同じであるが、気孔率が40％のものと
した。吸音率の測定結果は第７図の本発明例に示
す通りである。 Next, FIG. 7 shows the sound absorption coefficient measured by the reverberation chamber method for the acoustic tile A of the present invention. In addition,
The tile dimensions are 10cm for a and 10cm for b as shown in Figure 3.
c is 2 cm, d is 1.5 cm, the wall thickness of the hard tile body 1 is 1.5 cm, and the wall thickness of the porous ceramic 5 is 2 cm. The material of the hard tile body 1 is porcelain, and the material of the porous tile 5 is the same as that of the hard tile body 1, but the porosity is 40%. The measurement results of the sound absorption coefficient are as shown in the example of the present invention in FIG.
なお第７図にはこの試験に用いた音響タイルＡ
において多孔質セラミツク５を取り外したものに
ついての吸音率測定結果も示してある。更に第７
図には、このように多孔質セラミツクを取り外し
た後、空洞部７にグラスウールを密度が
24000g／m3となるように充填した場合の吸音率
の測定結果をも示す。 Figure 7 shows the acoustic tile A used in this test.
Also shown are the sound absorption coefficient measurement results for the porous ceramic 5 removed. Furthermore, the seventh
The figure shows that after removing the porous ceramic, glass wool is placed in the cavity 7 with a high density.
The measurement results of sound absorption coefficient when filled to 24000g/m 3 are also shown.
第７図より、本発明例に係る音響タイルはグラ
スウールを充填した比較例に係る音響タイルとほ
ぼ同様の優れた吸音効果を有することが認められ
る。 From FIG. 7, it is recognized that the acoustic tile according to the example of the present invention has almost the same excellent sound absorption effect as the acoustic tile according to the comparative example filled with glass wool.
［発明の効果］
以上の説明から明らかな通り、本発明によれば
グラスウールを用いることなく優れた吸音特性を
有する音響タイルが提供される。本発明の音響タ
イルは、グラスウール等の繊維材料を用いていな
いので、湿潤状態にある屋内プールの壁面等、等
湿度雰囲気或いは水のかかり易い箇所に好適に使
用することができる。なお、多孔質セラミツクそ
れ自体は吸水性を有するが、透水性が高く保水性
が低いので吸収された水は簡単に抜け出ることが
でき、音響タイルは容易にその吸音効果を回復す
る。[Effects of the Invention] As is clear from the above description, according to the present invention, an acoustic tile having excellent sound absorption properties can be provided without using glass wool. Since the acoustic tile of the present invention does not use a fiber material such as glass wool, it can be suitably used in a humid atmosphere or a place easily exposed to water, such as the wall surface of an indoor pool in a humid state. Note that although porous ceramic itself has water absorption properties, it has high water permeability and low water retention, so absorbed water can easily escape, and the acoustic tile easily recovers its sound absorption effect.
また、本発明の音響タイルでは、多孔質セラミ
ツクがスリツトの開口部を塞いでいるので、タイ
ル内部が外部から見えないという意匠上の効果が
奏されるほか、子供がスリツト開口部に手を入れ
る恐れがなく危険防止効果も有する。 In addition, in the acoustic tile of the present invention, since the porous ceramic closes the opening of the slit, the interior of the tile is not visible from the outside. There is no fear and it also has a danger prevention effect.
第１図は本発明の実施例に係る音響タイルの斜
視図、第２図は第３図の−線に沿う断面図、
第３図は第１図の平面図である。また第４図は本
発明の異なる実施例に係る音響タイルの斜視図、
第５図及び第６図はそれぞれ従来の吸音タイル又
はブロツクの斜視図、第７図は実施例に係る音響
タイル及び比較例に係る音響タイルの吸音特性の
測定結果を示すグラフである。
Ａ，Ｂ……音響タイル、１，１２……硬質タイ
ル本体、２……スリツト、３，４……片部、５，
１３……多孔質セラミツク、６……裏足。
FIG. 1 is a perspective view of an acoustic tile according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line - in FIG. 3,
FIG. 3 is a plan view of FIG. 1. FIG. 4 is a perspective view of an acoustic tile according to a different embodiment of the present invention;
5 and 6 are perspective views of conventional sound-absorbing tiles or blocks, respectively, and FIG. 7 is a graph showing the measurement results of the sound-absorbing properties of the acoustic tiles according to the example and the acoustic tiles according to the comparative example. A, B... Acoustic tile, 1, 12... Hard tile body, 2... Slit, 3, 4... Piece, 5,
13... Porous ceramic, 6... sole.
Claims (1)
スリツトを形成すると共に、このスリツトの両縁
部を筒内側に延出せしめて平行な片部を形成し、
これら片部の筒内側の端部を多孔質セラミツクで
封塞せしめてなることを特徴とする音響タイル。 ２ タイル本体の、スリツトを形成した一側面と
反対の側面に裏足を設けたことを特徴とする特許
請求の範囲第１項に記載の音響タイル。 ３ 長方形状の側板部と、この側板部の一方の長
側辺から立ち上がる背板部と、他方の長側辺から
立ち上がる前板部と、この前板部の前記側板部と
反対側の片部から前記背板部へ向けて該側板部と
平行に延出させた片部と、を有してなる硬質タイ
ル本体、及び、 この片部の自由辺側に固着された、側板部と同
長さに延在する多孔質セラミツクを備え、 前記前板部の立ち上がり高さは前記背板部の立
ち上がり高さよりも小さく、前記多孔質セラミツ
クは、背板部の立ち上がり高さと同じ高さまで該
片部から突出していることを特徴とする音響タイ
ル。 ４ 前記背板部の外面に裏足を設けたことを特徴
とする特許請求の範囲第３項に記載の音響タイ
ル。[Claims] 1. A slit is formed in one side of a hard tile body having a rectangular cylinder shape, and both edges of the slit are extended to the inside of the cylinder to form parallel pieces,
An acoustic tile characterized in that the ends of these pieces inside the cylinder are sealed with porous ceramic. 2. The acoustic tile according to claim 1, wherein a sole is provided on a side of the tile body opposite to one side on which the slit is formed. 3 A rectangular side plate part, a back plate part rising from one long side of this side plate part, a front plate part rising from the other long side, and a piece of this front plate part on the opposite side from the side plate part. a hard tile body having a piece extending parallel to the side plate towards the back plate, and having the same length as the side plate, the piece being fixed to the free side of the piece; and a porous ceramic extending from the front plate part to the same height as the rising height of the back plate part, the rising height of the front plate part being smaller than the rising height of the back plate part, Acoustic tiles characterized by protruding from the. 4. The acoustic tile according to claim 3, wherein sole feet are provided on the outer surface of the back plate portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61019758A JPS62178636A (en) | 1986-01-31 | 1986-01-31 | Acoustic tile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61019758A JPS62178636A (en) | 1986-01-31 | 1986-01-31 | Acoustic tile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62178636A JPS62178636A (en) | 1987-08-05 |
| JPH031458B2 true JPH031458B2 (en) | 1991-01-10 |
Family
ID=12008240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61019758A Granted JPS62178636A (en) | 1986-01-31 | 1986-01-31 | Acoustic tile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62178636A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0542478Y2 (en) * | 1988-11-18 | 1993-10-26 | ||
| JP7188908B2 (en) * | 2017-05-10 | 2022-12-13 | 日本環境アメニティ株式会社 | sound absorbing structure |
| JP7349884B2 (en) * | 2019-06-26 | 2023-09-25 | 清水建設株式会社 | How to manufacture a resonator |
-
1986
- 1986-01-31 JP JP61019758A patent/JPS62178636A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62178636A (en) | 1987-08-05 |
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