JPS61174900A - Oscillating system member for electro-acoustic transducer - Google Patents

Abstract

PURPOSE:To attain the high rigidity and the high thermal conductivity and to execute the injection molding by heating and molding, for the oscillating system member, the compound material consisting essentially of a layer-shaped mineral, a thermosetting resin monomer and a carbon fiber. CONSTITUTION:An oscillating system member where a coil bobbin part 3a and a diaphragm part 3b to which a voice coil 3 should be buried are molded integrally, and a compound material, consisting essentially of a layer-shaped mineral, a thermosetting resin monomer and a carbon fiber absorbing a curing agent or a curing accelerator to the section between layers are heated and molded. As the layer-shpaed mineral, for example, montmorillonite is exemplified. A montmorillonite compound substance is dispersed so as to pack the space of the carbon fiber, the blended type polymer is formed in which n epoxy polymer and a montmorillonite, which enter the layer section of montmorillonite, are strongly linked, and the polymer is organized to three-dimensional net-shaped construction so as to entangle the carbon fiber.

Description

【発明の詳細な説明】 ［産業上の利用分野］この発明は電気音響変換器用振動
系部材の改良に関し、特に剛性および熱伝導率が高く、
成形が非常に容易なる材料より構成された振動系部材に
関する。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to the improvement of vibration system members for electroacoustic transducers, particularly those having high rigidity and thermal conductivity.
The present invention relates to a vibration system member made of a material that is extremely easy to mold.

［従来の技術］従来一般的なスピーカーにお４１ては、
振動系部材たる振動板、ボイスコイル、コイルボビンは
それぞれ単独に作製され組立工程において、これらを一
体に接着結合して構造が殆んどである。[Prior art] Conventionally, common speakers 41 have
In most cases, the vibration system members, such as the diaphragm, voice coil, and coil bobbin, are manufactured individually and then bonded together by adhesive in the assembly process.

すなわち、振動板を形成する工程、コイルボビンを形成
する工程、コイルボビンにボイスコイル導線を巻回接着
結合する工程、前記ボイスコイルを巻回したコイルボビ
ンをギャップゲージを使用して磁気回路の磁気空隙に配
置し、コイルボビンに振動板を接着結合する工程を必要
としていた。That is, a step of forming a diaphragm, a step of forming a coil bobbin, a step of winding and adhesively bonding a voice coil conductor to the coil bobbin, and placing the coil bobbin around which the voice coil is wound in a magnetic gap of a magnetic circuit using a gap gauge. However, this required a process of adhesively bonding the diaphragm to the coil bobbin.

又この他にダンパー、エツジ等を接着結合する工程を必
要とすることは周知である。In addition, it is well known that a step of adhesively bonding dampers, edges, etc. is required.

したがって、多工程を経るので組立時間が長く、特に接
着剤乾燥に長時間を必要とする。Therefore, since multiple steps are required, assembly time is long, and in particular, a long time is required for drying the adhesive.

又各部品の寸法誤差や組立時における相互の位置ずれ等
により品質上に問題を有していた。In addition, there were quality problems due to dimensional errors in each component and mutual positional deviation during assembly.

更に近年合成樹脂を用いた振動板が多く採用されるが、
当該合成樹脂振動板は接着強度の面にも種々の問題を有
していた。Furthermore, in recent years, many diaphragms made of synthetic resin have been adopted.
The synthetic resin diaphragm also had various problems in terms of adhesive strength.

この問題を解決するため、従来特公昭３１−２１０２号
公報等に記載されているごとく、振動板又は振動板の一
部と、ボイスコイルを埋設すべきコイルボビンを合成樹
脂で一体に形成した振動系部材が考えられている。In order to solve this problem, as previously described in Japanese Patent Publication No. 31-2102, etc., a vibration system in which a diaphragm or a part of the diaphragm and a coil bobbin in which a voice coil is embedded are integrally formed of synthetic resin. parts are being considered.

［発明の解決すべき問題点］上記のごとく一体に形成さ
れた振動系部材においては、前述のように各部材を独立
して作成し、接着結合した構造の振動系部材における前
記問題がある程度解決されるが、撮動系部材を構成する
合成樹脂材料の選択に制限がある。[Problems to be solved by the invention] In the vibration system member integrally formed as described above, the above-mentioned problems in the vibration system member having a structure in which each member is made independently and adhesively bonded as described above can be solved to some extent. However, there are restrictions on the selection of synthetic resin materials that constitute the imaging system members.

すなわち、截頭円錐形等の比較的単純な形状と比べて、
コイルボビン部が一体になった形状はより立体的になる
とともに、ボイスコイルを埋設することから成形方法と
しては射出成形手段を取らざるを得ない。In other words, compared to a relatively simple shape such as a truncated cone,
The integrated shape of the coil bobbin portion is more three-dimensional, and since the voice coil is embedded, injection molding must be used as the molding method.

周知のごとく射出成形は樹脂の流動性が適当でないと正
確な成形寸法を得ることが困難であり、主として熱可塑
性樹脂に適用される成形手段である。As is well known, injection molding is a molding method mainly applied to thermoplastic resins because it is difficult to obtain accurate molded dimensions unless the fluidity of the resin is appropriate.

そして周知のように熱可塑性樹脂はヤング率が樹脂の内
でも小さい方であるので撮動形部材の剛性を充分に高め
ることができない。As is well known, thermoplastic resins have a smaller Young's modulus than other resins, so it is not possible to sufficiently increase the rigidity of the moving member.

又、剛性を高める手段として熱可塑性樹脂に炭素繊維、
ガラス繊維等の高弾性率繊維や炭酸カルシューム、マイ
カ粉等の充填材を混合した強化プラスチック材の使用も
考えられるが、充填材の混°合により流動性が著しく低
下する欠点があり所定の形状の成形が困難になるので混
合比率が制限され、そのため充分な剛性を有する一体成
形された振動系部材を得ることができない。Also, as a means to increase rigidity, carbon fiber, thermoplastic resin, etc.
The use of reinforced plastic materials mixed with high modulus fibers such as glass fibers and fillers such as calcium carbonate and mica powder is also considered, but this has the disadvantage that fluidity is significantly reduced due to the mixture of fillers, and it is difficult to maintain the desired shape. Since it becomes difficult to mold, the mixing ratio is limited, making it impossible to obtain an integrally molded vibration system member with sufficient rigidity.

たとえば、ポリプロピレン樹脂では射出成形が可能な炭
素繊維の混合量はたかだか１５部程度であり成形された
振動系部材の剛性も略６　Ｘ　１０”ｄｙｎ／ｃｍにす
ぎない。For example, with polypropylene resin, the amount of carbon fiber that can be injection molded is at most about 15 parts, and the rigidity of the molded vibration system member is only about 6 x 10'' dyn/cm.

更に熱硬化性樹脂は一般的に熱可塑性樹脂より大きなり
フグ率を有するが、周知のごとく射出成形が極めて困難
である欠点を有する。Furthermore, although thermosetting resins generally have a higher puffiness ratio than thermoplastic resins, they have the well-known disadvantage that injection molding is extremely difficult.

［問題点を解決するための手段］この発明は少なくとも
ボイスコイルを埋設すべきコイルボビン部と振動板部が
一体に成形された振動系部材であって当該部材は硬化剤
又は硬化促進剤を眉間に吸着せしめた層状鉱物と熱硬化
性樹脂モノマーとカーボン繊維を主要材料とする複合材
料を加熱成形してなる電気音響変換器用振動系部材であ
る。[Means for Solving the Problems] The present invention provides a vibration system member in which at least a coil bobbin portion in which a voice coil is embedded and a diaphragm portion are integrally molded, and the member is coated with a hardening agent or hardening accelerator between the eyebrows. This is a vibration system member for an electroacoustic transducer made by thermoforming a composite material whose main materials are adsorbed layered minerals, thermosetting resin monomers, and carbon fibers.

［実施例］この発明の振動板に用いられる硬化剤又は硬
化促進剤を眉間に吸着させた層状鉱物としてはたとえば
、含水アルミケイ酸塩の一種であるモンモリロナイト（
Ａ　Ｉ２０．−４　Ｓ　ｉ　Ｏ□−ｎ　Ｈ２Ｏ、別名ベ
ントナイト）がある。[Example] Examples of layered minerals to which curing agents or curing accelerators are adsorbed between the eyebrows for use in the diaphragm of the present invention include montmorillonite (a type of hydrous aluminum silicate).
AI20. -4 S i O□-n H2O, also known as bentonite).

当該モンモリロナイトを硬化剤又は硬化促進剤を適当な
溶剤に溶かした溶液中に漫積（６０℃、数時間）する。The montmorillonite is placed in a solution containing a curing agent or curing accelerator dissolved in a suitable solvent (60° C., several hours).

これによってモンモリロナイトのシリケート層間に硬化
剤又は硬化促進剤が吸着される。As a result, the curing agent or curing accelerator is adsorbed between the silicate layers of montmorillonite.

これを溶液洗浄した後、乾燥せしめて硬化剤又は硬化促
進剤との複合体を得る。After solution washing, this is dried to obtain a composite with a curing agent or curing accelerator.

次に 複合体（硬化剤としてジアミノジフェニールメタン吸着
）　　　　　　　　　　　　　１０　　部エポキシ樹脂
モノマー（商品名アラルダイト６０７１）　　　　　　
　３５部 硬化剤（ジアミノジフェニールスルホン）４．４部 離型剤（ステアリン酸亜鉛）　　　　　１　部カーボン
繊維（ポリアクニロニトリル系カーボン繊維　平均長０
．３５ｍｍ）　　　　　５０　　部上記配合物を加温下
（８５℃）で撹拌して均一に配合し、しかる後に冷却せ
しめて粉砕し粉末状の複合材料を得た。Next, the composite (adsorbed diaminodiphenylmethane as a curing agent) was added to 10 parts of epoxy resin monomer (trade name: Araldite 6071).
35 parts hardening agent (diaminodiphenylsulfone) 4.4 parts mold release agent (zinc stearate) 1 part carbon fiber (polyacnylonitrile carbon fiber, average length 0)
．． 35 mm) 50 parts The above-mentioned mixture was stirred under heating (85° C.) to be uniformly blended, then cooled and pulverized to obtain a powdered composite material.

当該複合材料を射出成形機に投入し、第２図に示すよう
に、雌型１ａの底部の円筒部分１１ａに予じめ巻回した
ボイスコイル２を配置し、雄型１ｂを所定の位置に移動
した後前記雌型の円筒底部１１ａに形成したゲートｌｃ
より溶融した前記複合材料を射出する。The composite material is put into an injection molding machine, and as shown in FIG. 2, the pre-wound voice coil 2 is placed around the cylindrical portion 11a at the bottom of the female mold 1a, and the male mold 1b is placed in a predetermined position. After the movement, a gate lc formed on the female cylindrical bottom part 11a.
The more molten composite material is injected.

上記工程で得られる振動系部材は第１図に示すボイスコ
イル２が埋設されたコイルボビン部３ａと振動板部３ｂ
が一体となった構造を有する。The vibration system members obtained in the above steps are a coil bobbin part 3a in which the voice coil 2 is embedded and a diaphragm part 3b shown in FIG.
It has an integrated structure.

上記実施例で得られた撮動系部材のヤング率をＯ 測定したところｌ　４　、６　Ｘ　１０ｄｙｎ／ｃｍの
値を示し、熱伝導率を測定したところ１　、８　Ｘ　１
０ｃａｌ／’ＣＣ−５ｅｃ−Ｃの値を示した。When the Young's modulus of the imaging system member obtained in the above example was measured, it showed a value of l 4 , 6 x 10 dyn/cm, and when the thermal conductivity was measured, it was 1 , 8 x 1
The value was 0 cal/'CC-5ec-C.

［発明の効果］この発明の振動系部材の効果は次の通り
である。[Effects of the Invention] The effects of the vibration system member of the present invention are as follows.

（１）高剛性である。(1) High rigidity.

従来の射出成形が可能な、たとえば前述のポリプロピレ
ンをベースとした強化プラスチック樹脂のヤング率がせ
いぜい６　Ｘ　１０　ｄｙｎ／ｃｍであるのに体し実施
例ではその略２．５倍の値を得ることが出来、更に高剛
性の振動系部材を提供することができる。Although the Young's modulus of the reinforced plastic resin based on conventional injection molding, such as the aforementioned polypropylene, is at most 6 x 10 dyn/cm, in this example, a value approximately 2.5 times that value can be obtained. This makes it possible to provide a highly rigid vibration system member.

この要因としては、カーボン繊維の空間を埋めるように
モンモリロナイト複合体が分散し、かつモンモリロナイ
トの層間に入り込んだエポキシポリマーとモンモリロナ
イトが強固に結合されたブレンド形ポリマーが形成され
、当該ブレンド形ポリマーがカーボン繊維をからみ込む
ように３次元網状構造に組織化される為であると思われ
る。The reason for this is that the montmorillonite composite is dispersed to fill the spaces between the carbon fibers, and a blended polymer is formed in which the epoxy polymer and montmorillonite that have entered between the layers of the montmorillonite are strongly bonded, and the blended polymer is This is thought to be because the fibers are organized into a three-dimensional network structure that entangles the fibers.

（２）熱伝導率が高い、 上記実施例では１　、８　Ｘ　１０ｃａｌ／’Ｃ０５ｅ
ｃ、ｃｍの値が得られた、この値は合成樹脂の熱伝導率
の概路頭３〜７　Ｘ　Ｉ　Ｏｃａｌ／’Ｃ・５ｅｃ−ｃ
ｍに比べ、著しく大きいのでボイスコイル発生熱の放熱
効果が増大し、ボイスコイルの許容人力が増大し耐人力
特性を改善することができた。(2) High thermal conductivity, in the above example 1.8 x 10cal/'C05e
The value of c, cm was obtained. This value is the approximate value of the thermal conductivity of synthetic resin.
Since it is significantly larger than m, the heat dissipation effect of the heat generated by the voice coil increases, the permissible human force of the voice coil increases, and the human force resistance characteristics can be improved.

これは樹脂間に多量に混合された炭素繊維が熱伝導に貢
献するからである。This is because a large amount of carbon fiber mixed between the resins contributes to heat conduction.

（３）射出成形が可能である、 この発明の振動系部材は射出成形機内の加温によりエポ
キシ樹脂が一旦溶融し低粘度となって流動するが、一定
温度（１５０℃）まではモンモリロナイトの層間に吸着
された硬化剤又は硬化促進剤が浸出しないので硬化現象
が開始されず低粘度の流動状態を保持する結果、射出成
形を可能にし、かつ立体形等の複雑な成形型であっても
、その隅々まで充填され形状寸法精度の高い振動系部材
を得ることができた。　従来熱硬化性樹脂を射出成形す
るにおいては加熱と同時に硬化が開始され充分な充填時
間が得られない点が射出成形を困難にしていた原因であ
ったが、この発明によれば温度制御により良好な流動性
を長時間保持することができ、これにより射出成形を可
能ならしめた。(3) Injection molding is possible. In the vibration system member of this invention, the epoxy resin melts once by heating inside the injection molding machine, becomes low in viscosity, and flows. However, up to a certain temperature (150°C) Since the adsorbed curing agent or curing accelerator does not leach out, the curing phenomenon does not start and a low viscosity fluid state is maintained, making injection molding possible and even with complex molds such as three-dimensional shapes. It was possible to obtain a vibration system member whose every corner was filled with high precision in shape and size. Conventionally, when injection molding thermosetting resins, curing started at the same time as heating, making injection molding difficult because sufficient filling time could not be obtained, but with this invention, temperature control makes injection molding easier. It can maintain good fluidity for a long time, which makes injection molding possible.

すなわち、この発明によれば樹脂の内ではヤング率の高
い熱硬化性樹脂の使用、高比率の充填材の混合が可能、
射出成形による一体モールド成形を可能ならしめること
により高剛性、高熱伝導率の物性的特徴を有し、ボイス
コイルが埋設されたコイルボビンと振動板が一体に成形
された構造的に剛性の高い振動系部材を提供することが
できる利点を有する。That is, according to the present invention, it is possible to use a thermosetting resin with a high Young's modulus and to mix a high proportion of filler.
A vibration system with high structural rigidity, in which the coil bobbin in which the voice coil is embedded and the diaphragm are integrally molded, has the physical characteristics of high rigidity and high thermal conductivity by making integral molding possible by injection molding. It has the advantage of being able to provide members.

なお、層状鉱物に吸着させる硬化促進剤としては、たと
えばエチルメチルイミダゾールが無水フタル酸く硬化剤
）との組み合わせで使用できる。As the curing accelerator to be adsorbed to the layered mineral, for example, ethylmethylimidazole can be used in combination with phthalic anhydride (hardening agent).

又、この発明をコーン型振動板を有する振動系部材に適
用した場合について述べたが勿論ドーム型スピーカーの
振動系部材にも適用可能である。Furthermore, although the present invention has been described as being applied to a vibration system member having a cone-shaped diaphragm, it is of course applicable to a vibration system member of a dome-shaped speaker.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの発明実施例の振動系部材の断面図、第２図
はこの発明実施例の振動系部材を一体成形する金型の断
面図である。FIG. 1 is a sectional view of a vibration system member according to an embodiment of the invention, and FIG. 2 is a sectional view of a mold for integrally molding the vibration system member according to an embodiment of the invention.

Claims (1)

【特許請求の範囲】[Claims] 少なくともボイスコイルを埋設すべきコイルボビン部と
振動板部が一体に成形された振動系部材であって当該部
材は硬化剤又は硬化促進剤を層間に吸着せしめた層状鉱
物と熱硬化性樹脂モノマーとカーボン繊維を主要材料と
する複合材料を加熱成形してなることを特徴とする電気
音響変換器用振動系部材。A vibration system member in which at least a coil bobbin portion in which a voice coil is embedded and a diaphragm portion are integrally molded, and the member is made of layered mineral, thermosetting resin monomer, and carbon with a hardening agent or hardening accelerator adsorbed between the layers. A vibration system member for an electroacoustic transducer characterized by being made by heat-molding a composite material whose main material is fiber.