JPH075885A - Acoustic filter - Google Patents
Acoustic filterInfo
- Publication number
- JPH075885A JPH075885A JP26083892A JP26083892A JPH075885A JP H075885 A JPH075885 A JP H075885A JP 26083892 A JP26083892 A JP 26083892A JP 26083892 A JP26083892 A JP 26083892A JP H075885 A JPH075885 A JP H075885A
- Authority
- JP
- Japan
- Prior art keywords
- acoustic filter
- mat
- tubes
- noise
- acoustic
- 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.)
- Pending
Links
- 239000000126 substance Substances 0.000 claims abstract description 6
- 102100040428 Chitobiosyldiphosphodolichol beta-mannosyltransferase Human genes 0.000 abstract description 7
- 239000002184 metal Substances 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 229920003002 synthetic resin Polymers 0.000 abstract description 3
- 239000000057 synthetic resin Substances 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 2
- 238000005555 metalworking Methods 0.000 abstract 1
- 229920005989 resin Polymers 0.000 abstract 1
- 239000011347 resin Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000011358 absorbing material Substances 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Landscapes
- Exhaust Silencers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は音響フィルタ−、より詳
細には、プリンタ等の事務機等に用い、それらから発生
する騒音等を減衰せしめる音響フィルタ−に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic filter, and more particularly to an acoustic filter which is used in office machines such as printers and which attenuates noise and the like generated from them.
【０００２】[0002]
【従来の技術】従来より室内の騒音等を減衰するため
に、グラスウ−ル、金属、粗毛フェルト、綿、化成品等
の音波を吸収する吸音材料が広く用いられている。これ
らを用いて音圧レベルを下げる場合は、各吸音材料の音
響特性に依存することになる。これらを用いてある一定
の周波数帯域の音響レベルを下げるためには、それらの
材料を組み合わせたりして行なうが、そのために多くの
材料が使用されることが多く、設置スペ−スが限られて
いるときは特に問題となる。2. Description of the Related Art Conventionally, sound absorbing materials such as glass wool, metal, coarse wool felt, cotton, and chemical products that absorb sound waves have been widely used in order to attenuate noise in the room. When the sound pressure level is lowered by using these, it depends on the acoustic characteristics of each sound absorbing material. In order to lower the sound level in a certain frequency band using these, a combination of these materials is used, but many materials are often used for that purpose, and the installation space is limited. It is especially problematic when you are there.
【０００３】[0003]
【発明が解決しようとする課題】上述したように従来の
吸音材は、目的とする周波数帯域の音響エネルギ−を効
果的に吸収する手段として種々の問題がある。そこで本
発明は、そのような問題がなく、効率よく騒音等を減衰
し得る音響フィルタ−を提供することを課題とする。As described above, the conventional sound absorbing material has various problems as means for effectively absorbing the acoustic energy in the target frequency band. Therefore, an object of the present invention is to provide an acoustic filter that can efficiently attenuate noise and the like without such a problem.
【０００４】[0004]
【課題を解決するための手段】本発明は、化成品、ゴム
等のマット上ないし筐体中に種々の長さのチュ−ブをラ
ンダムに並設して成る音響フィルタ−、を以て上記課題
を解決した。SUMMARY OF THE INVENTION The present invention provides an acoustic filter comprising tubes of various lengths randomly arranged on a mat such as a chemical product or rubber or in a housing. Settled.
【０００５】[0005]
【作 用】複数種のチュ−ブによって構成される音響フ
ィルタ−により騒音の周波数帯が変えられ、耳障りな音
が消される。[Operation] The frequency band of noise is changed by the acoustic filter composed of multiple types of tubes, and the offensive sound is eliminated.
【０００６】[0006]
【実施例】本発明の実施例を図面に依拠して説明する。
図中１は化成スポンジ、ゴムその他適宜資材製のマット
で、例えば縦６０ｍｍ、横３２０ｍｍ、厚さ５〜１０ｍ
ｍに成形する。２は両端を開放した合成樹脂製、金属製
等のチュ−ブで、例えば内径が３ｍｍであって種々の長
さのものを用意し、それらをランダムに組み合わせてマ
ット１上に並べて固定し、音響フィルタ−を構成する。
なお、マット１の代わりに、両端を開口した合成樹脂
製、金属製等の筐体を用い、その内壁面にチュ−ブ２を
板金、ないし、一体成形等により設置することとしても
よい。Embodiments of the present invention will be described with reference to the drawings.
In the figure, 1 is a mat made of chemical sponge, rubber or other appropriate material, for example, 60 mm long, 320 mm wide, 5-10 m thick.
Mold to m. 2 is a tube made of synthetic resin, metal or the like with both ends open, prepared, for example, having an inner diameter of 3 mm and various lengths, randomly combining them and fixing them side by side on the mat 1, It constitutes an acoustic filter.
Instead of the mat 1, a casing made of synthetic resin or metal with both ends opened may be used, and the tube 2 may be installed on its inner wall surface by sheet metal or integrally molding.
【０００７】図３は本発明に係る音響フィルタ−の有効
性を実証するための試験装置を示すもので、被験試料を
収納する試験ボックス３にマイクロフォン４とスピ−カ
−５を設置してある。スピ−カ−５には、白色雑音発生
源６と増幅器７が接続される。この装置において、スピ
−カ−５から発せられる駆動信号ｘ（ｔ）とマイクロフ
ォン４からの出力信号ｙ（ｔ）をク−リエ変換し、クロ
ススペクトル法を用いて周波数伝達振幅特性を測定す
る。FIG. 3 shows a test device for demonstrating the effectiveness of the acoustic filter according to the present invention. A microphone 4 and a speaker 5 are installed in a test box 3 for storing a test sample. . A white noise source 6 and an amplifier 7 are connected to the speaker 5. In this device, the drive signal x (t) emitted from the speaker 5 and the output signal y (t) from the microphone 4 are subjected to a Courier conversion, and the frequency transfer amplitude characteristic is measured using the cross spectrum method.
【０００８】図４は、上記試験装置により測定したチュ
−ブ２を設置してないマット１だけの場合の周波数伝達
振幅特性を示すグラフであり、横軸は周波数、縦軸はデ
シベル値を示す。（使用機種：ＣＦ− 360ポ−タブル
デュアル チャンネル ＦＦＴ アナライザ−， 100Ｋ
Ｈｚ Ａ：ＡＣ／50Ｖ，Ｂ：ＡＣ／50Ｖ ＩＮＳＴ０／
16 ＤＵＡＬ １Ｋ） 図５は、マット１に様々の長さのチュ−ブ２を３１個、
Ｍ系列信号の連を用いて並置した本発明に係る音響フィ
ルタ−について、上記同様の試験をして得られた周波数
伝達振幅特性を示すグラフである。FIG. 4 is a graph showing the frequency transmission amplitude characteristics measured by the above-mentioned test apparatus in the case of only the mat 1 without the tube 2 installed. The horizontal axis represents frequency and the vertical axis represents decibel value. . (Use model: CF-360 Portable
Dual Channel FFT Analyzer, 100K
Hz A: AC / 50V, B: AC / 50V INST0 /
16 DUAL 1K) Fig. 5 shows mat 1 with 31 tubes 2 of various lengths.
7 is a graph showing frequency transfer amplitude characteristics obtained by performing the same test as described above with respect to the acoustic filter according to the present invention juxtaposed using a series of M-sequence signals.
【０００９】上記２つのグラフを比較してみると、耳障
りな２ＫＨｚ〜５ＫＨｚの周波数帯域のレベルが低下し
ていることが分かり、マット１のみの場合よりも本発明
に係る音響フィルタ−の場合の方が音の吸音減衰効果が
大きいことが明白である。By comparing the above two graphs, it was found that the level of the frequency band of 2 KHz to 5 KHz, which is offensive to the ear, was lowered. It is clear that the sound absorption and damping effect of sound is greater.
【００１０】更に、異なるＭ系列を用いてチュ−ブ２の
並べ換えを行なって製作した音響フィルタ−を２段重ね
合わせた場合の効果につき、測定した伝達振幅特性を図
６に示す。これと、図５に示した１段の音響フィルタ−
の場合の測定結果と比較した場合、２ＫＨｚ〜５ＫＨｚ
にあった伝達振幅特性の山は更に低くなり、音響フィル
タ−の重ね合わせの効果は、１段の音響フィルタ−を用
いた場合よりも顕著であることが分かる。Further, FIG. 6 shows the measured transfer amplitude characteristics of the effect obtained when two stages of acoustic filters produced by rearranging the tubes 2 by using different M series are superposed. This and the one-stage acoustic filter shown in FIG.
2KHz to 5KHz when compared with the measurement result in the case of
It can be seen that the peak of the transfer amplitude characteristic that is present is further lowered, and the effect of superimposing the acoustic filters is more prominent than when the one-stage acoustic filter is used.
【００１１】結論として、ここで製作した音響フィルタ
−の素子は、両端開放の管ではあるが、目的とする周波
数の音圧低減は、当然複数の音響フィルタ−の構成を考
慮することによって、更に効果が大きくなるということ
がいえる。なお、本発明に係る音響フィルタ−は、音響
エネルギ−の消散だけでなく、振動吸収用素子としても
機能させ得るので、本フィルタ−を振動吸収フィルタ−
として利用することもできる。In conclusion, although the element of the acoustic filter manufactured here is a tube whose both ends are open, the sound pressure reduction at the target frequency can be further reduced by naturally considering the constitution of a plurality of acoustic filters. It can be said that the effect increases. Since the acoustic filter according to the present invention can function not only as a dissipation element of acoustic energy but also as a vibration absorbing element, the present filter can be used as a vibration absorbing filter.
It can also be used as.
【００１２】[0012]
【発明の効果】本発明は上述した通りであって、本発明
に係る音響フィルタ−を用いれば耳障りな騒音が消され
るので、事務機、エンジンその他騒音を発する機器の周
辺に配置するのに好適であり、騒音による不快感をなく
して事務能率等を向上させることができ、振動吸収フィ
ルタ−として利用することもできる効果がある。The present invention is as described above, and since the use of the acoustic filter according to the present invention eliminates annoying noise, it is suitable for being placed around an office machine, an engine, or other equipment that emits noise. Therefore, there is an effect that the discomfort caused by noise can be eliminated, the office work efficiency and the like can be improved, and it can be used as a vibration absorption filter.
【図１】 本発明に係る音響フィルタ−の構成を示す正
面図である。FIG. 1 is a front view showing a configuration of an acoustic filter according to the present invention.
【図２】 本発明に係る音響フィルタ−の構成を示す平
面図である。FIG. 2 is a plan view showing a configuration of an acoustic filter according to the present invention.
【図３】 本発明に係る音響フィルタ−の効果を実証す
るための試験装置の構成を示す図である。FIG. 3 is a diagram showing a configuration of a test apparatus for demonstrating the effect of the acoustic filter according to the present invention.
【図４】 上記試験装置によって得られた音響フィルタ
−のないマットのみの場合における周波数伝達振幅特性
のグラフを示す図である。FIG. 4 is a diagram showing a graph of a frequency transfer amplitude characteristic in the case of only a mat without an acoustic filter, which is obtained by the test apparatus.
【図５】 上記試験装置によって得られた音響フィルタ
−における周波数伝達振幅特性のグラフを示す図であ
る。FIG. 5 is a diagram showing a graph of frequency transfer amplitude characteristics in an acoustic filter obtained by the above test device.
【図６】 上記試験装置によって得られた音響フィルタ
−を２段備えた場合の周波数伝達振幅特性のグラフを示
す図である。FIG. 6 is a diagram showing a graph of a frequency transfer amplitude characteristic in the case where two stages of acoustic filters obtained by the test device are provided.
１ マット ２ チュ−ブ ３ 試験ボックス ４ マイクロフォン ５ スピ−カ− ６ 白色雑音発生源 ７ 増幅器 1 Matte 2 Tube 3 Test Box 4 Microphone 5 Speaker 6 White Noise Source 7 Amplifier
───────────────────────────────────────────────────── フロントページの続き (71)出願人 592205964 浅井 信平 埼玉県比企郡川島町八幡５−９−８ (72)発明者 柴山 秀雄 神奈川県横浜市泉区下飯田町903−30 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 592205964 Shinpei Asai 5-9-8 Hachiman, Kawashima-cho, Hiki-gun, Saitama Prefecture (72) Hideo Shibayama 903-30 Shimoida-cho, Izumi-ku, Yokohama-shi, Kanagawa
Claims (1)
に種々の長さのチュ−ブをランダムに並設して成る音響
フィルタ−。1. An acoustic filter comprising tubes of various lengths arranged at random on a mat such as a chemical product or rubber or in a housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26083892A JPH075885A (en) | 1992-09-03 | 1992-09-03 | Acoustic filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26083892A JPH075885A (en) | 1992-09-03 | 1992-09-03 | Acoustic filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH075885A true JPH075885A (en) | 1995-01-10 |
Family
ID=17353464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26083892A Pending JPH075885A (en) | 1992-09-03 | 1992-09-03 | Acoustic filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH075885A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6420090B1 (en) | 1998-12-04 | 2002-07-16 | Kansai Paint Co., Ltd. | Liquid photocurable composition, water-based photocurable composition and resist pattern-forming method by use of the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0425897A (en) * | 1990-05-21 | 1992-01-29 | Takashi Fujimura | Pipe sound deadening board |
-
1992
- 1992-09-03 JP JP26083892A patent/JPH075885A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0425897A (en) * | 1990-05-21 | 1992-01-29 | Takashi Fujimura | Pipe sound deadening board |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6420090B1 (en) | 1998-12-04 | 2002-07-16 | Kansai Paint Co., Ltd. | Liquid photocurable composition, water-based photocurable composition and resist pattern-forming method by use of the same |
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