JPH0752996B2 - Vibration plate for speakers - Google Patents
Vibration plate for speakersInfo
- Publication number
- JPH0752996B2 JPH0752996B2 JP62019930A JP1993087A JPH0752996B2 JP H0752996 B2 JPH0752996 B2 JP H0752996B2 JP 62019930 A JP62019930 A JP 62019930A JP 1993087 A JP1993087 A JP 1993087A JP H0752996 B2 JPH0752996 B2 JP H0752996B2
- Authority
- JP
- Japan
- Prior art keywords
- speaker diaphragm
- core material
- metal
- 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 - Lifetime
Links
Landscapes
- Diaphragms For Electromechanical Transducers (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は高音域の周波数特性が優れたサンドイッチ構
造を有するスピーカ用振動板に関するものである。Description: TECHNICAL FIELD The present invention relates to a speaker diaphragm having a sandwich structure with excellent frequency characteristics in the high frequency range.
一般にスピーカ用振動板に要求される特性には（イ）面
密度が小さいこと、（ロ）比弾性率E/ρが大きいこと
（E:弾性率、ρ：密度）、（ハ）適度な内部損失（tan
δ）を持つこと、（ニ）曲げ剛性が大きいことが要求さ
れる。特にコーン形振動板においては内周部（ボイスコ
イル側）はボイスコイルボビンの振動を忠実に伝播しな
ければならないことから大きな比弾性率が要求される。
一方、外周部（エッジ側）はエッジからの反射振動を吸
収しなければならないため、内部損失が適度に大きいの
が理想的である。Generally, the characteristics required for speaker diaphragms are (a) low areal density, (b) large specific elastic modulus E / ρ (E: elastic modulus, ρ: density), (c) moderate internal Loss (tan
δ) and (d) high flexural rigidity. Particularly in the cone-shaped diaphragm, a large specific elastic modulus is required because the vibration of the voice coil bobbin must be faithfully propagated to the inner peripheral portion (voice coil side).
On the other hand, the outer peripheral portion (edge side) has to absorb the reflected vibration from the edge, and thus it is ideal that the internal loss is moderately large.
従来のスピーカ用振動板として、金属または高分子材料
の薄膜からなるハニカムコア等のコア材からなる芯材の
両面に繊維強化プラスチックの薄膜からなる表皮材を接
着した三層サンドイッチ構造を有するものがある。そし
て上記表皮材の基材として、炭素繊維、ガラス繊維、芳
香族ポリアミド繊維等からなる織布を用いるものが提案
されている（例えば実開昭56-43994号）。Conventional speaker diaphragms have a three-layer sandwich structure in which a core material made of a core material such as a honeycomb core made of a thin film of a metal or a polymer material is bonded with a skin material made of a thin film of fiber reinforced plastic on both sides. is there. As a base material for the skin material, there has been proposed one using a woven fabric made of carbon fiber, glass fiber, aromatic polyamide fiber, etc. (for example, Japanese Utility Model Publication No. 56-43994).
しかしながら、従来の炭素繊維またはガラス繊維を基材
とした三層サンドイッチ構造を有するスピーカ用振動板
は基材の弾性率が大きいため、サンドイッチ構造体の比
弾性率が大きく、振動板としては有効な構造ではある
が、一般的には比弾性率と内部損失は反比例の関係にあ
るため、内部損失が小さくなってスピーカ用振動板とし
ての要求特性を十分満たすことができなかった。また芳
香族ポリアミド繊維を基材としたスピーカ用振動板は炭
素繊維またはガラス繊維を基材としたものに比ベ、内部
損失が大きくなり、比弾性率も大きくなるが、理想的特
性レベルには達しないという問題点があった。However, since the conventional diaphragm for a speaker having a three-layer sandwich structure using carbon fiber or glass fiber as a base material has a large elastic modulus of the base material, the sandwich structure has a large specific elastic modulus and is effective as a diaphragm. Although it has a structure, in general, the specific elastic modulus and the internal loss are in inverse proportion to each other, so that the internal loss becomes small and the required characteristics as the speaker diaphragm cannot be sufficiently satisfied. In addition, speaker diaphragms based on aromatic polyamide fibers have larger internal loss and higher specific elastic modulus than those based on carbon fibers or glass fibers, but at the ideal characteristic level. There was a problem that it did not reach.
本発明は上記問題点を解消するためになされたもので、
比弾性率が大きく、適度な内部損失を有し、スピーカ用
振動板に要求される特性を満足するスピーカ用振動板を
得ることを目的としている。The present invention has been made to solve the above problems,
An object of the present invention is to obtain a speaker diaphragm having a large specific elastic modulus, an appropriate internal loss, and satisfying the characteristics required for the speaker diaphragm.
この発明のスピーカ用振動板は、コア材からなる芯材の
両面に繊維強化プラスチックの薄膜からなる表皮材を接
着した三層サンドイッチ構造を有するスピーカ用振動板
において、少なくとも一方の表皮材として、金属めっき
を施こした炭素繊維から形成された織布を基材とする繊
維強化プラスチックを用いるものである。The speaker diaphragm of the present invention is a speaker diaphragm having a three-layer sandwich structure in which a skin material made of a thin film of fiber reinforced plastic is adhered to both surfaces of a core material made of a core material, and at least one of the skin materials is metal. It uses a fiber reinforced plastic whose base is a woven fabric formed from plated carbon fibers.
芯材となるコア材としては、金属または高分子材料の薄
膜からなるハニカムコアなどのコア材が使用でき、その
一部を切欠いて屈曲性を増加させた構造としてもよい。
この芯材の両面に接着される一方または両方の表皮材の
基材となる織布は金属めっきを施した炭素繊維から構成
されるものである。めっきを行う金属としては任意のも
のがあるが、ニッケル、亜鉛、銅、錫などが好ましく、
１種または数種のものを炭素繊維上にめっきする。めっ
き層の厚さとしては0.05〜0.5μｍが好ましい。めっき
は炭素繊維の単繊維またはロービングに対して単繊維間
の間隔を保った状態で行い、各単繊維の全表面に均一に
めっき層が形成されるようにするのが好ましい。As the core material serving as the core material, a core material such as a honeycomb core made of a metal or polymer thin film can be used, and a part of the core material may be cut out to increase the flexibility.
The woven cloth which is a base material for one or both of the skin materials adhered to both surfaces of the core material is composed of carbon fibers plated with metal. Although any metal can be plated, nickel, zinc, copper, tin, etc. are preferable,
One or several kinds are plated on carbon fiber. The thickness of the plating layer is preferably 0.05 to 0.5 μm. It is preferable that the plating is performed with respect to the monofilaments of carbon fibers or roving with a space between the monofilaments being maintained so that a plating layer is uniformly formed on the entire surface of each monofilament.
このように金属めっきを施した炭素繊維はロービングか
ら平織等の織布を形成し、これを表皮材の基材とするの
が好ましいが、ヤーンから織布を形成してもよい。一方
の表皮材の基材にこのような織布を用いるときは、他方
の表皮材の基材に従来の炭素繊維、ガラス繊維等の織布
を用いる。これらの基材はエポキシ樹脂等の樹脂を含浸
させ、加熱、加圧して樹脂を硬化させて繊維強化プラス
チックとし、表皮材を形成する。そしてこの表皮材を上
記芯材の両面に重ね、接着してサンドイッチ構造とし、
スピーカ用振動板が得られる。It is preferable that the carbon fibers plated with metal in this manner form a woven cloth such as a plain weave from roving and use this as a base material of the skin material, but the woven cloth may be formed from yarns. When such a woven cloth is used as the base material of one of the skin materials, a conventional woven cloth of carbon fiber, glass fiber or the like is used as the base material of the other skin material. These base materials are impregnated with a resin such as an epoxy resin and heated and pressed to cure the resin to form a fiber reinforced plastic to form a skin material. Then, this skin material is laminated on both sides of the core material and bonded to form a sandwich structure,
A diaphragm for a speaker can be obtained.
こうして得られるスピーカ用振動板はスピーカフレーム
に取付け、ボイスコイルに接続して、従来のものと同様
に使用する。この場合、炭素繊維はそれぞれの単糸がめ
っきされて、めっき界面が増大しているため、界面効果
により内部損失は適度に大きくなる。このとき比弾性率
は低下するが、従来のガラス繊維を用いるものとほぼ同
程度の大きさの比弾性率となる。従ってこのような炭素
繊維の織布を基材とする繊維強化プラスチックからなる
スピーカ用振動板は比弾性率が高いため、ボイスコイル
ボビンの振動を忠実に伝播し、かつ適度の内部損失を有
するため、エッジからの反射振動を吸収し、高音域の周
波数特性のあばれは少ない。The speaker diaphragm thus obtained is attached to a speaker frame, connected to a voice coil, and used in a conventional manner. In this case, since each single yarn of carbon fiber is plated and the plating interface is increased, the internal loss is appropriately increased due to the interface effect. At this time, the specific elastic modulus is reduced, but the specific elastic modulus is about the same as that of the conventional glass fiber. Therefore, since the speaker diaphragm made of fiber reinforced plastic having such a carbon fiber woven fabric as a base material has a high specific elastic modulus, it faithfully propagates the vibration of the voice coil bobbin and has an appropriate internal loss. It absorbs the reflected vibration from the edge and has little frequency characteristics in the high frequency range.
以下、この発明の一実施例を図について説明する。第１
図は実施例を示す断面図、第２図は基材の平面図、第３
図はそのＡ−Ａ断面図である。図において、（１）はス
ピーカ用振動板で、コーン状に形成され、アルミニウム
箔のハニカムコアからなる芯材（２）の内側および外側
に表皮材（３），（４）が接着されて、三層サンドイッ
チ構造となっている。表皮材（３），（４）は炭素繊維
に金属めっきした単糸の集合体であるロービング（５）
を平織した織布（６）を基材とし、これに樹脂を含浸さ
せて加熱、加圧により硬化させ、繊維強化プラスチック
としたものである。An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 2 is a cross-sectional view showing an embodiment, FIG. 2 is a plan view of a base material, and FIG.
The figure is a sectional view taken along line AA. In the figure, (1) is a speaker diaphragm, which is formed in a cone shape, and skin materials (3) and (4) are adhered to the inside and outside of a core material (2) made of a honeycomb core of aluminum foil, It has a three-layer sandwich structure. The skin materials (3) and (4) are rovings (5), which are aggregates of single yarns obtained by metal-plating carbon fibers.
A plain woven fabric (6) is used as a base material, which is impregnated with a resin and cured by heating and pressurization to obtain a fiber reinforced plastic.
直径７μｍの炭素繊維からなるロービングに0.1μｍの
ニッケル下地めっきを施し、さらに、0.1μｍの亜鉛め
っきを施したものを平織により織布を形成し、これにエ
ポキシ樹脂を含浸させ、プレスしながら加熱硬化し、繊
維の体積含有率約50％、厚さ0.12mmの表皮材（３），
（４）を得た。芯材（２）としては厚さ0.05mmのアルミ
ニウム箔からなり、セルサイズ3/16inch、厚さ3mmのア
ルミニウムハニカムコアを用いた。またエポキシ樹脂か
らなる接着剤で上記表皮材（３），（４）を芯材（２）
の両側に貼り合せ、加熱、加圧により接着して三層サン
ドイッチ構造のスピーカ用振動板を得た。得られた試片
について振動リード法により求められた比弾性率E/ρと
内部損失tan δの値を表１に示す。Roving made of carbon fiber with a diameter of 7 μm is plated with 0.1 μm nickel undercoat, and 0.1 μm zinc plated is formed into a woven fabric by plain weave, which is impregnated with epoxy resin and heated while pressing. A skin material (3) that is cured and has a volume content of fibers of about 50% and a thickness of 0.12 mm,
(4) was obtained. As the core material (2), an aluminum honeycomb core made of an aluminum foil having a thickness of 0.05 mm, having a cell size of 3/16 inch and a thickness of 3 mm was used. Further, the skin material (3), (4) is replaced with a core material (2) with an adhesive made of an epoxy resin.
The both sides were bonded to each other and bonded by heating and pressure to obtain a speaker diaphragm having a three-layer sandwich structure. Table 1 shows the values of the specific elastic modulus E / ρ and the internal loss tan δ obtained by the vibration lead method for the obtained sample.
比較例として、炭素繊維およびガラス繊維ロービングか
らなる織布を基材とした三層サンドイッチ板、ならびに
従来の紙コーンの結果を表１に併記する。As a comparative example, Table 1 also shows the results of a three-layer sandwich plate based on a woven fabric made of carbon fiber and glass fiber roving, and a conventional paper cone.
表１から明らかなように、本発明の金属めっき炭素繊維
による表皮材を用いると、比弾性率は従来のガラス繊維
によるものとほぼ同程度になるとともに、内部損失は従
来の紙コーンと同じ位になり、従来の紙コーン振動板に
比べピストン運動領域は約２倍拡大でき、しかも内部損
失が大きいため高音域での周波数特性のあばれが少な
く、ハニカム振動板特有の固有音が消え、物性および聴
感特性上からきわめて有効な三層サンドイッチ構造のス
ピーカ用振動板が得られることがわかる。 As is clear from Table 1, when the skin material made of the metal-plated carbon fiber of the present invention is used, the specific elastic modulus is almost the same as that of the conventional glass fiber, and the internal loss is the same as that of the conventional paper cone. The piston motion range can be expanded about twice as much as the conventional paper cone diaphragm, and since the internal loss is large, the frequency characteristic in the high frequency range is small, and the characteristic sound unique to the honeycomb diaphragm disappears. It can be seen from the audibility characteristics that a very effective three-layer sandwich structure diaphragm for a speaker can be obtained.
以上の通り、本発明によれば、金属めっき炭素繊維ロー
ビングからなる織布を基材とする繊維強化プラスチック
をサンドイッチ構造の表皮材として用いるため、めっき
界面を大きくして内部損失を適度に大きくすることがで
き、この場合でも比弾性率を大きく保つことができ、こ
のため比弾性率が大きく、適度な内部損失を有し、高音
域の周波数特性が優れたスピーカ用振動板が得られる。As described above, according to the present invention, since the fiber reinforced plastic based on the woven cloth made of the metal-plated carbon fiber roving is used as the skin material of the sandwich structure, the plating interface is increased and the internal loss is appropriately increased. Even in this case, the specific elastic modulus can be kept large. Therefore, a speaker diaphragm having a large specific elastic modulus, an appropriate internal loss, and excellent frequency characteristics in the high frequency range can be obtained.
第１図は実施例の断面図、第２図は基材の平面図、第３
図はＡ−Ａ断面図である。 各図中、同一符号は同一または相当部分を示し、（１）
はスピーカ用振動板、（２）は芯材、（３），（４）は
表皮材、（５）はロービング、（６）は織布である。FIG. 1 is a sectional view of an embodiment, FIG. 2 is a plan view of a base material, and FIG.
The figure is a sectional view taken along line AA. In the drawings, the same reference numerals indicate the same or corresponding parts, and (1)
Is a speaker diaphragm, (2) is a core material, (3) and (4) are skin materials, (5) is roving, and (6) is woven cloth.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭50−63912（ＪＰ，Ａ) 実開 昭58−19596（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-50-63912 (JP, A) Actual development Sho-58-19596 (JP, U)
Claims (3)
スチックの薄膜からなる表皮材を接着した三層サンドイ
ッチ構造を有するスピーカ用振動板において、少なくと
も一方の表皮材として、金属めっきを施した炭素繊維か
ら形成された織布を基材とする繊維強化プラスチックを
用いることを特徴とするスピーカ用振動板。1. A speaker diaphragm having a three-layer sandwich structure in which a skin material made of a thin film of fiber reinforced plastic is adhered to both surfaces of a core material made of a core material, and at least one skin material is metal-plated. A speaker diaphragm, comprising a fiber reinforced plastic having a woven fabric made of carbon fiber as a base material.
なるハニカムコアであることを特徴とする特許請求の範
囲第１項記載のスピーカ用振動板。2. The speaker diaphragm according to claim 1, wherein the core material is a honeycomb core made of a thin film of metal or polymer material.
から選ばれる１種以上の金属によるものであることを特
徴とする特許請求の範囲第１項または第２項記載のスピ
ーカ用振動板。3. The speaker diaphragm according to claim 1 or 2, wherein the metal plating is made of one or more metals selected from nickel, zinc, copper and tin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62019930A JPH0752996B2 (en) | 1987-01-30 | 1987-01-30 | Vibration plate for speakers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62019930A JPH0752996B2 (en) | 1987-01-30 | 1987-01-30 | Vibration plate for speakers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63187900A JPS63187900A (en) | 1988-08-03 |
| JPH0752996B2 true JPH0752996B2 (en) | 1995-06-05 |
Family
ID=12012935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62019930A Expired - Lifetime JPH0752996B2 (en) | 1987-01-30 | 1987-01-30 | Vibration plate for speakers |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0752996B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1429582B1 (en) * | 2002-12-09 | 2013-01-16 | Onkyo Corporation | Loudspeaker diaphragm and method for manufacturing the same |
| USD818992S1 (en) | 2015-03-31 | 2018-05-29 | B & W Group Ltd | Loudspeaker |
| GB2538809B (en) | 2015-05-29 | 2021-08-25 | B & W Group Ltd | Loudspeaker diaphragm |
| US10547949B2 (en) | 2015-05-29 | 2020-01-28 | EVA Automation, Inc. | Loudspeaker diaphragm |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5063912A (en) * | 1973-10-08 | 1975-05-30 | ||
| JPS5819596U (en) * | 1981-07-28 | 1983-02-07 | 三菱電機株式会社 | Diaphragm for speaker |
-
1987
- 1987-01-30 JP JP62019930A patent/JPH0752996B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63187900A (en) | 1988-08-03 |
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