JPH04360397A - Diaphragm for speaker - Google Patents
Diaphragm for speakerInfo
- Publication number
- JPH04360397A JPH04360397A JP13483291A JP13483291A JPH04360397A JP H04360397 A JPH04360397 A JP H04360397A JP 13483291 A JP13483291 A JP 13483291A JP 13483291 A JP13483291 A JP 13483291A JP H04360397 A JPH04360397 A JP H04360397A
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- voice coil
- speaker
- pulp
- fibers made
- 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
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 239000004760 aramid Substances 0.000 claims abstract description 12
- 229920003235 aromatic polyamide Polymers 0.000 claims abstract description 12
- 239000011347 resin Substances 0.000 claims abstract description 12
- 229920005989 resin Polymers 0.000 claims abstract description 12
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 8
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 8
- 239000000463 material Substances 0.000 abstract description 6
- 238000010559 graft polymerization reaction Methods 0.000 abstract description 3
- 229920002554 vinyl polymer Polymers 0.000 abstract 2
- 239000002904 solvent Substances 0.000 description 4
- 239000000123 paper Substances 0.000 description 3
- 230000000379 polymerizing effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000002166 wet spinning Methods 0.000 description 1
Landscapes
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は音響出力機器等に用いら
れるスピーカ用振動板に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm for speakers used in sound output equipment and the like.
【０００２】0002
【従来の技術】近年、カセットテープレコーダ、マイク
ロカセットテープレコーダ、ハイファイステレオ業界に
おいては音響出力機器としてのスピーカの音響特性にお
いて、従来よりもさらに出力音圧、歪み率、平坦性に優
れた高音質のスピーカが望まれており、音響特性を左右
するスピーカ用振動板はますます重要視されている。[Background Art] In recent years, in the cassette tape recorder, micro cassette tape recorder, and high-fidelity stereo industries, the acoustic characteristics of speakers used as sound output equipment have improved to provide high sound quality with even better output sound pressure, distortion rate, and flatness than before. The diaphragm for the speaker, which affects the acoustic characteristics, is becoming more and more important.
【０００３】以下、上述の従来のスピーカの例について
、その動作を説明する。スピーカは振動板、ボイスコイ
ルボビン、ボイスコイルなどの振動系とマグネット、ポ
ール、プレート、ヨークよりなる磁気回路系よりなる。[0003] The operation of the conventional speaker mentioned above will be explained below. A speaker consists of a vibration system such as a diaphragm, voice coil bobbin, and voice coil, and a magnetic circuit system consisting of a magnet, pole, plate, and yoke.
【０００４】一様な磁場中の中にあるボイスコイルに音
声電流が流れるとボイスコイルに上下方向の電磁力が発
生し、電流に応じて振動する。この振動を正しく振動板
の振動に伝え音波として放射される（例えば、早坂寿雄
：音響工学入門、日刊工業新聞社）。When an audio current flows through a voice coil in a uniform magnetic field, a vertical electromagnetic force is generated in the voice coil, causing it to vibrate in response to the current. This vibration is transmitted correctly to the vibration of the diaphragm and is emitted as a sound wave (for example, Toshio Hayasaka: Introduction to Acoustic Engineering, Nikkan Kogyo Shimbun).
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、スピー
カの振動板は使用する周波数帯域にわたってピストン運
動することが理想とされるが、振動中に振動板が変形し
たり分割振動が生ずると音圧−周波数特性、歪み率、位
相特性等が劣化し、高忠実再生の妨げとなる。また、従
来多く用いられている紙コーン振動板材料のもつＥ／ρ
（ただし、Ｅ：弾性率、ρ：密度）が小さいため、高域
共振周波数が低く、スピーカが高域まで再生できないと
いう欠点があった。[Problems to be Solved by the Invention] However, although it is ideal for the diaphragm of a speaker to make piston motion over the frequency band used, if the diaphragm deforms during vibration or split vibration occurs, the sound pressure - frequency Characteristics, distortion rate, phase characteristics, etc. deteriorate, impeding high-fidelity reproduction. In addition, the E/ρ of the paper cone diaphragm material that has been widely used
(However, since E: modulus of elasticity, ρ: density) is small, the high-frequency resonance frequency is low and the speaker cannot reproduce high frequencies.
【０００６】本発明は上記問題点に鑑み、振動中に振動
板が変形したり分割振動を生ぜず、高域共振周波数が高
く音圧−周波数特性、歪み率、位相特性の優れかつ耐熱
性、耐溶剤性、耐候性の高いスピーカ用振動板を提供す
るものである。In view of the above-mentioned problems, the present invention has been developed to provide a device that does not deform the diaphragm or cause split vibration during vibration, has a high high-frequency resonance frequency, has excellent sound pressure-frequency characteristics, distortion rate, and phase characteristics, and has excellent heat resistance. The present invention provides a speaker diaphragm with high solvent resistance and weather resistance.
【０００７】[0007]
【課題を解決するための手段】この目的を達成するため
に本発明のスピーカ用振動板は、メタ系あるいはパラ系
芳香族ポリアミド樹脂よりなる繊維をポリビニルアルコ
ールをグラフト重合した後、パルプと共に抄造した構成
物を振動板材料として用いたものである。[Means for Solving the Problems] In order to achieve this object, the speaker diaphragm of the present invention is produced by graft polymerizing fibers made of meta- or para-aromatic polyamide resin with polyvinyl alcohol and then making them together with pulp. The structure is used as a diaphragm material.
【０００８】[0008]
【作用】本発明は、上記した材料を用いているため、弾
性率が大きく、これを振動板として用いた場合、振動板
の曲げ剛性が非常に大きく、振動中に振動板が変形した
り分割共振が生じない。また基材としてパルプとメタ系
あるいはパラ系芳香族ポリアミド樹脂よりなる繊維をポ
リビニルアルコールでグラフト重合した繊維を混抄した
構成物を用いているため、比弾性率Ｅ／ρ（ただし、Ｅ
：弾性率、ρ：密度）が大きく、これを振動板として用
いた場合、スピーカの再生帯域がのび、優れた音圧−周
波数特性、歪み率、位相特性を持つスピーカを得ること
ができる。[Function] Since the present invention uses the above-mentioned material, it has a large elastic modulus, and when used as a diaphragm, the diaphragm has a very high bending rigidity, and the diaphragm may deform or split during vibration. No resonance occurs. In addition, since the base material is a mixture of pulp and fibers made of meta- or para-aromatic polyamide resin graft-polymerized with polyvinyl alcohol, the specific elastic modulus E/ρ (however, E
: elastic modulus, ρ: density), and when used as a diaphragm, the reproduction band of the speaker is extended, and a speaker with excellent sound pressure-frequency characteristics, distortion rate, and phase characteristics can be obtained.
【０００９】また、メタ系あるいはパラ系芳香族ポリア
ミド樹脂よりなる繊維は、非常に大きい内部損失を持っ
ているため、同じく内部損失の大きいパルプと混抄した
構成物はこれを振動板として用いた場合、スピーカの音
圧−周波数特性の山谷を平坦化し忠実な音響再生を得る
ことができる。[0009]Furthermore, since fibers made of meta- or para-aromatic polyamide resin have a very large internal loss, when used as a diaphragm, a composition made by mixing pulp with pulp, which also has a large internal loss, has a very high internal loss. , it is possible to flatten the peaks and valleys of the sound pressure-frequency characteristics of the speaker and obtain faithful sound reproduction.
【００１０】さらに、このメタ系あるいはパラ系芳香族
ポリアミド樹脂よりなる繊維はポリビニルアルコールで
グラフト重合しているために、抄造時における繊維どう
しの結着剤がいっさい必要でなく製法の簡素化が計れる
。また、グラフト重合による接着機構であるため、接着
強度が従来の結着剤を混入した方式に比べ大きく、耐溶
剤性、耐熱性、耐候性に優れ、大きな入力信号を入れる
ことができ、非常に過酷な条件下でのスピーカの使用に
耐え得る。Furthermore, since the fibers made of the meta- or para-aromatic polyamide resin are graft-polymerized with polyvinyl alcohol, there is no need for a binder between the fibers during papermaking, which simplifies the manufacturing process. . In addition, because the adhesive mechanism uses graft polymerization, the adhesive strength is greater than that of conventional methods that incorporate binders, and it has excellent solvent resistance, heat resistance, and weather resistance, and can accept large input signals, making it extremely The speaker can withstand use under harsh conditions.
【００１１】[0011]
【実施例】以下、本発明の一実施例のスピーカ用振動板
について説明する。[Embodiment] A speaker diaphragm according to an embodiment of the present invention will be described below.
【００１２】本発明の一実施例におけるスピーカは、メ
タ系あるいはパラ系芳香族ポリアミド樹脂よりなる繊維
にポリビニルアルコールをグラフト重合した繊維をパル
プと共に混抄し、振動板の形状に成形して用いている。
この振動板はボイスコイルボビンに固着され、ボイスコ
イルボビンの先端に設けられたボイスコイルが磁気回路
の磁気ギャップに挿入されている。[0012] A speaker according to an embodiment of the present invention uses fibers made by graft polymerizing polyvinyl alcohol onto fibers made of meta- or para-aromatic polyamide resin, which are mixed together with pulp and molded into the shape of a diaphragm. . This diaphragm is fixed to a voice coil bobbin, and the voice coil provided at the tip of the voice coil bobbin is inserted into a magnetic gap of a magnetic circuit.
【００１３】以上のように構成されたスピーカについて
、以下その動作について説明する。スピーカは振動板、
ボイスコイルボビン、ボイスコイルなどの振動系とマグ
ネット、ポール、プレート、ヨークよりなる磁気回路系
よりなる。一様な磁場の中にあるボイスコイルに音声電
流が流れるとボイスコイルに上下方向の電磁力が発生し
、電流に応じて振動する。この振動は正しく振動板の振
動に伝えられ、音波として放出される。また、ボイスコ
イルに流れる音声電流は、電磁力を発生させるとともに
多くは熱エネルギーとして変換される。このときのボイ
スコイルの温度は入力される音声電流の大きさに応じて
高くなり、しばしば２００゜Ｃを越える。そしてこの熱
はボイスコイルボビンを通じて振動板にも伝達されるた
め、熱変形温度の高くない材料で構成された振動板は変
形をきたし、発生する音が歪んだりノイズの発生する原
因となる。The operation of the speaker configured as described above will be explained below. The speaker is a diaphragm,
It consists of a vibration system such as a voice coil bobbin and voice coil, and a magnetic circuit system consisting of a magnet, pole, plate, and yoke. When an audio current flows through a voice coil in a uniform magnetic field, a vertical electromagnetic force is generated in the voice coil, causing it to vibrate in response to the current. This vibration is properly transmitted to the vibration of the diaphragm and emitted as a sound wave. Furthermore, the audio current flowing through the voice coil generates electromagnetic force and is mostly converted into thermal energy. The temperature of the voice coil at this time increases depending on the magnitude of the input audio current, and often exceeds 200°C. Since this heat is also transmitted to the diaphragm through the voice coil bobbin, the diaphragm made of a material that does not have a high thermal deformation temperature is deformed, causing distortion of the generated sound and generation of noise.
【００１４】次に振動板の製造方法について述べると、
メタ系あるいはパラ系芳香族ポリアミド樹脂よりなる繊
維を溶媒、たとえば濃硫酸の溶媒に溶解し、その溶液よ
り湿式紡糸法により１．５〜２デニールの太さの繊維を
成形したものに、放射線重合法によりメタ系あるいはパ
ラ系芳香族ポリアミド樹脂よりなる繊維１００部に対し
てポリビニルアルコール５部をグラフト重合した繊維を
、３〜１０ｍｍの長さに切断したものを未晒し、クラフ
トパルプに対して重量比で１０〜１５％加え、水中に重
量比０．１〜０．３％分散させ、６０〜８０メッシュの
金網を用いて抄造した後加熱プレス、熱風圧乾燥器等で
、所定の振動板形状に成形する。Next, the method for manufacturing the diaphragm will be described.
Fibers made of meta- or para-aromatic polyamide resin are dissolved in a solvent such as concentrated sulfuric acid, and fibers with a thickness of 1.5 to 2 deniers are formed from the solution by wet spinning. Fibers made by legally grafting 5 parts of polyvinyl alcohol to 100 parts of fibers made of meta- or para-aromatic polyamide resin are cut into lengths of 3 to 10 mm, unbleached, and weighed against kraft pulp. Add 10 to 15% by weight, disperse in water with a weight ratio of 0.1 to 0.3%, make paper using a 60 to 80 mesh wire mesh, and then use a hot press, hot air pressure dryer, etc. to form a diaphragm into a predetermined shape. Form into.
【００１５】以上のように本実施例によれば、メタ系あ
るいはパラ系芳香族ポリアミド樹脂よりなる繊維にポリ
ビニルアルコールをグラフト重合した繊維をパルプと共
に抄造した構成物を振動板として成形して用いたスピー
カは振動板の変形、分割共振が生ぜず良好な音響特性が
得られ、パルプ製コーン型振動板と比較して歪み率を２
４ｄＢ低下させることができる。音圧−周波数特性の山
谷も±２．０ｄＢとパルプの振動板と比較して、約±３
．０ｄＢ低下させることができた。As described above, according to the present example, a structure obtained by making a paper together with pulp from fibers made by graft polymerizing polyvinyl alcohol onto fibers made of meta- or para-aromatic polyamide resin was molded and used as a diaphragm. The speaker has good acoustic characteristics without deformation of the diaphragm or split resonance, and has a distortion rate of 2% compared to a pulp cone-shaped diaphragm.
It can be reduced by 4dB. The peaks and troughs of the sound pressure-frequency characteristics are also ±2.0dB, which is approximately ±3dB compared to a pulp diaphragm.
．． We were able to reduce the noise by 0dB.
【００１６】[0016]
【発明の効果】以上のように本発明は、メタ系あるいは
パラ系芳香族ポリアミド樹脂よりなる繊維にポリビニル
アルコールをグラフト重合した繊維をパルプと共に抄造
した構成物を成形し、これを振動板として用いたことに
より、歪み率が小さく、高域共振周波数が高く、良好な
音響特性と音質を有し、また耐熱性が高く、耐溶剤性、
耐候性の高い、かつ耐入力の高い、音響出力の大きなス
ピーカを得ることができ、良好な音響特性および音質と
、高い信頼性を有する優れたスピーカを実現できる。Effects of the Invention As described above, the present invention molds a structure in which fibers made of meta- or para-aromatic polyamide resin are graft-polymerized with polyvinyl alcohol together with pulp, and this is used as a diaphragm. As a result, it has a low distortion rate, a high high resonance frequency, good acoustic characteristics and sound quality, and has high heat resistance, solvent resistance,
A speaker with high weather resistance, high input resistance, and a large acoustic output can be obtained, and an excellent speaker with good acoustic characteristics and sound quality and high reliability can be realized.
Claims (1)
ド樹脂よりなる繊維をポリビニルアルコールをグラフト
重合した後、パルプと共に抄造した構成物を用いたこと
を特徴とするスピーカ用振動板。1. A diaphragm for a speaker, characterized in that it uses a structure obtained by graft-polymerizing fibers made of meta- or para-aromatic polyamide resin with polyvinyl alcohol and then forming the fibers with pulp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13483291A JPH04360397A (en) | 1991-06-06 | 1991-06-06 | Diaphragm for speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13483291A JPH04360397A (en) | 1991-06-06 | 1991-06-06 | Diaphragm for speaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04360397A true JPH04360397A (en) | 1992-12-14 |
Family
ID=15137507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13483291A Pending JPH04360397A (en) | 1991-06-06 | 1991-06-06 | Diaphragm for speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04360397A (en) |
-
1991
- 1991-06-06 JP JP13483291A patent/JPH04360397A/en active Pending
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