JPH0349240B2 - - Google Patents
Info
- Publication number
- JPH0349240B2 JPH0349240B2 JP19697482A JP19697482A JPH0349240B2 JP H0349240 B2 JPH0349240 B2 JP H0349240B2 JP 19697482 A JP19697482 A JP 19697482A JP 19697482 A JP19697482 A JP 19697482A JP H0349240 B2 JPH0349240 B2 JP H0349240B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- diaphragm
- talc
- elastic modulus
- speaker
- 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
Links
- 229920005989 resin Polymers 0.000 claims description 19
- 239000011347 resin Substances 0.000 claims description 19
- 239000000454 talc Substances 0.000 claims description 12
- 229910052623 talc Inorganic materials 0.000 claims description 12
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 10
- 239000002131 composite material Substances 0.000 claims description 9
- -1 poly(2,6-dimethyl-1,4-phenylene) Polymers 0.000 claims description 9
- 230000000379 polymerizing effect Effects 0.000 claims description 8
- NXXYKOUNUYWIHA-UHFFFAOYSA-N 2,6-Dimethylphenol Chemical compound CC1=CC=CC(C)=C1O NXXYKOUNUYWIHA-UHFFFAOYSA-N 0.000 claims description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- 229920000728 polyester Polymers 0.000 description 5
- 239000000805 composite resin Substances 0.000 description 3
- OMIHGPLIXGGMJB-UHFFFAOYSA-N 7-oxabicyclo[4.1.0]hepta-1,3,5-triene Chemical compound C1=CC=C2OC2=C1 OMIHGPLIXGGMJB-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 229920001230 polyarylate Polymers 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Description
産業上の利用分野
本発明は電気音響用変換器におけるスピーカ用
振動板に関するものである。
従来例の構成とその問題点
従来よりプラスチツクからなるスピーカ用振動
板として、ポリエチレンテレフタレートフイルム
（以下ポリエステルという）が使用されてきた。
しかし、ポリエステルは弾性率が小さく（19000
Kg／cm2）、フルレンジのスピーカの場合には高域
共振周波数（fH）低く高音再生は必ずしも良好で
はない。又、二軸延伸をほどこすことによりポリ
エステルの弾性率は向上するが、延伸がほどこさ
れているため加熱により収縮が生じ、所定の振動
板形状への成形が困難であるという問題があつ
た。
発明の目的
本発明の目的は、高弾性率で高音再生に有利で
あると同時に成形性にも優れたスピーカ用振動板
を提供することにある。
発明の構成
本発明のスピーカ用振動板は、2.6−ジメチル
フエノールを重合したポリ（2.6−ジメチル−1.4
−フエニレン）エーテルにスチレンをグラフト重
合して得た樹脂又はその樹脂を主体とする樹脂に
タルクを複合した複合フイルムを所定の振動板形
状に成形したものである。これにより、高弾性率
で高音再生が良好であり、成形性に優れたスピー
カ用振動板を得ることができる。
タルクを20wt％複合した樹脂の弾性率、密度、
比弾性率、曲げ剛性をタルクを含まない当該樹
脂、ポリエステルと共に表１に示した。
INDUSTRIAL APPLICATION FIELD The present invention relates to a speaker diaphragm in an electroacoustic transducer. Conventional Structure and Problems Polyethylene terephthalate film (hereinafter referred to as polyester) has conventionally been used as a speaker diaphragm made of plastic.
However, polyester has a small elastic modulus (19000
Kg/cm 2 ), and in the case of a full-range speaker, the high-frequency resonance frequency (f H ) is low and treble reproduction is not necessarily good. Furthermore, although the elastic modulus of polyester is improved by applying biaxial stretching, there is a problem in that the stretching process causes shrinkage when heated, making it difficult to mold into a predetermined diaphragm shape. OBJECT OF THE INVENTION An object of the present invention is to provide a diaphragm for a speaker that has a high modulus of elasticity and is advantageous for reproducing high-pitched sounds and also has excellent moldability. Structure of the Invention The speaker diaphragm of the present invention is a poly(2.6-dimethyl-1.4
- A composite film obtained by graft polymerizing styrene to (phenylene) ether or a resin mainly composed of this resin and talc is molded into a predetermined diaphragm shape. Thereby, it is possible to obtain a speaker diaphragm with a high elastic modulus, good high-frequency sound reproduction, and excellent moldability. Elastic modulus, density, and 20wt% talc composite resin
The specific elastic modulus and bending rigidity are shown in Table 1 together with the talc-free resin and polyester.
【表】【table】
【表】
表１に示されるように、このタルク複合の当該
樹脂は弾性率が高く比弾性率も大きいため、この
樹脂を用いたスピーカ用振動板は高域共振周波数
（fH）が高く、高音再生が良好なものとなる。又、
曲げ剛性も高いため歪率が減少する。このタルク
複合の当該樹脂は、耐水性、耐熱水性に優れ、耐
候性にも優れているため、当該樹脂の振動板を用
いたスピーカは屋外での使用にも適する。しかも
耐熱性試験では自己消火性であるため、このフイ
ルムを成形した振動板は難燃性を有する。又、こ
の樹脂のフイルムは成形が容易で、真空成形、圧
空成形、真空圧空成形及び熱プレス成形が可能で
あり、量産性に優れている。
実施例の説明
実施例 １
振動板成形用樹脂として、２，６−ジメチルフ
エノールを重合したポリ（2.6−ジメチル−1.4−
フエニレン）エーテルにスチレンをグラフト重合
して得られた樹脂にタルクを20wt％複合した複
合フイルムを用いた。このフイルムの弾性率は
39000Kg／cm2でタルクを含まないフイルムの弾性
率（24000Kg／cm2）の1.6倍以上であつた。このフ
イルムを圧空成形法により振動板形状への成形を
行い、直径40mmφ厚さ100μｍのコーン型振動板
を得た。図のａはこの振動板を用いた音響特性、
図のｂは同じ直径と厚みを持つタルクを含まない
上記樹脂の振動板を用いた音響特性、図のｃは同
じ直径と厚みを持つポリエステル振動板を用いた
音響特性を示している。図から有らかなように本
実施例の複合フイルム振動板を用いたスピーカ
は、弾性率が高く比弾性率も高いため高域共振周
波数fHが高くなり高音再生が良好であつた。
実施例 ２
上述した樹脂にタルクを1.0wt％複合した複合
フイルムの弾性率は26000（Kg／cm2）であつた。実
施例１と同様にして、この複合フイルムを振動板
形状に成形したスピーカの周波数特性は、タルク
を複合しない上記フイルムの振動板及びポリエス
テルフイルムの振動板を用いたスピーカと比較し
て、実施例１と同様に高域共振周波数fHが高く高
音再生が良好であつた。
実施例 ３
上述した樹脂にタルクを60wt％複合した複合
フイルムの弾性率は51000Kg／cm2であつた。実施
例１と同様にして、この複合フイルムを振動板に
成形したスピーカの周波数特性は、タルクを複合
しない上記フイルムの振動板及びポリエステルフ
イルムの振動板を用いたスピーカと比較して、実
施例１と同様に高域共振周波数fHが高く高音再生
が良好であつた。
尚、上記の実施例ではベース材として2.6−ジ
メチルフエノールを重合したポリ（2.6−ジメチ
ル−1.4−フエニレン）エーテルにスチレンをグ
ラフト重合して得た樹脂を用いたが、これ以外に
ベース材は上述した樹脂に熱可塑性樹脂を加えて
それ自体の特性を改善したものであつてもよい。
たとえば、耐熱性の向上を図るためにポリアリレ
ートを添加したり、耐溶剤性の向上を図るために
ポリエチレン、ポリプロピレン、ポリエチレンテ
レフタレート、ポリブチレンテレフタレートを添
加したり、成形性の向上を図るためにポリ塩化ビ
ニル、ポリアリレートを添加したものであつても
よい。
発明の効果
以上、詳述したように本発明によれば2.6−ジ
メチルフエノールを重合したポリ（2.6−ジメチ
ル−1.4−フエニレン）エーテルにスチレンをグ
ラフト重合して得た樹脂又はその樹脂を主体とす
る樹脂にタルクを複合した複合フイルムを用いた
ので、高音再生が良好で、成形性に優れたスピー
カ用振動板を得ることができる。[Table] As shown in Table 1, this talc composite resin has a high elastic modulus and a high specific elastic modulus, so a speaker diaphragm using this resin has a high high resonance frequency (f H ). High-pitched sound reproduction becomes good. or,
Since the bending rigidity is also high, the strain rate is reduced. This talc composite resin has excellent water resistance, hot water resistance, and weather resistance, so a speaker using a diaphragm made of this resin is suitable for outdoor use. Moreover, since it was self-extinguishing in the heat resistance test, the diaphragm made from this film has flame retardant properties. In addition, this resin film is easy to mold, and can be subjected to vacuum forming, pressure forming, vacuum pressure forming, and hot press forming, and is excellent in mass production. Description of Examples Example 1 Poly(2.6-dimethyl-1.4-
A composite film was used in which 20 wt% of talc was combined with a resin obtained by graft polymerizing styrene to (phenylene) ether. The elastic modulus of this film is
The elastic modulus was 39,000 Kg/cm 2 , which was more than 1.6 times the elastic modulus of a film not containing talc (24,000 Kg/cm 2 ). This film was molded into a diaphragm shape by air pressure forming to obtain a cone-shaped diaphragm with a diameter of 40 mm and a thickness of 100 μm. Figure a shows the acoustic characteristics using this diaphragm.
Figure b shows the acoustic characteristics using a talc-free resin diaphragm having the same diameter and thickness, and Figure c shows the acoustic characteristics using a polyester diaphragm having the same diameter and thickness. As is clear from the figure, the speaker using the composite film diaphragm of this example had a high elastic modulus and a high specific elastic modulus, so the high-frequency resonance frequency f H was high and the high-frequency sound reproduction was good. Example 2 The elastic modulus of a composite film made by compounding the above-mentioned resin with 1.0 wt% of talc was 26000 (Kg/cm 2 ). In the same manner as in Example 1, the frequency characteristics of a speaker formed by molding this composite film into a diaphragm shape were compared with a speaker using a diaphragm made of the above film without talc and a diaphragm made of polyester film. Similar to No. 1, the high-frequency resonant frequency f H was high and high-pitched sound reproduction was good. Example 3 The elastic modulus of a composite film in which 60 wt % of talc was combined with the above-mentioned resin was 51000 Kg/cm 2 . In the same manner as in Example 1, the frequency characteristics of a speaker in which this composite film was molded into a diaphragm were compared with those in which a diaphragm made of the above-mentioned film without talc and a diaphragm made of polyester film were used. Similarly, the high-frequency resonant frequency fH was high and high-pitched sound reproduction was good. In the above examples, a resin obtained by graft polymerizing styrene to poly(2,6-dimethyl-1,4-phenylene) ether, which is obtained by polymerizing 2,6-dimethylphenol, was used as the base material. It may also be one in which the properties of the resin itself are improved by adding a thermoplastic resin to the resin.
For example, polyarylate is added to improve heat resistance, polyethylene, polypropylene, polyethylene terephthalate, or polybutylene terephthalate is added to improve solvent resistance, and polyethylene is added to improve moldability. It may also contain vinyl chloride or polyarylate. Effects of the Invention As detailed above, according to the present invention, a resin obtained by graft polymerizing styrene to poly(2,6-dimethyl-1,4-phenylene) ether obtained by polymerizing 2,6-dimethylphenol or a resin based thereon is used. Since a composite film made of resin and talc is used, a speaker diaphragm with good high-frequency sound reproduction and excellent moldability can be obtained.
図は本発明の一実施例および従来のスピーカの
周波数特性の比較曲線図である。
The figure is a comparative curve diagram of frequency characteristics of an embodiment of the present invention and a conventional speaker.
Claims (1)
（2.6−ジメチル−1.4−フエニレン）エーテルに
スチレンをグラフト重合して得た樹脂又はその樹
脂を主体とする樹脂にタルクを複合した複合フイ
ルムを成形したことを特徴とするスピーカ用振動
板。1. A resin obtained by graft polymerizing styrene to poly(2,6-dimethyl-1,4-phenylene) ether obtained by polymerizing 2,6-dimethylphenol, or a composite film composed of a resin mainly composed of this resin and talc is molded. A diaphragm for speakers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19697482A JPS5986993A (en) | 1982-11-10 | 1982-11-10 | Diaphragm for loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19697482A JPS5986993A (en) | 1982-11-10 | 1982-11-10 | Diaphragm for loudspeaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5986993A JPS5986993A (en) | 1984-05-19 |
| JPH0349240B2 true JPH0349240B2 (en) | 1991-07-26 |
Family
ID=16366734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19697482A Granted JPS5986993A (en) | 1982-11-10 | 1982-11-10 | Diaphragm for loudspeaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5986993A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4534094B2 (en) * | 2004-07-12 | 2010-09-01 | オンキヨー株式会社 | Speaker diaphragm and manufacturing method thereof |
-
1982
- 1982-11-10 JP JP19697482A patent/JPS5986993A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5986993A (en) | 1984-05-19 |
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