JPH08289391A - Speaker diaphragm - Google Patents

Speaker diaphragm

Info

Publication number
JPH08289391A
JPH08289391A JP8430195A JP8430195A JPH08289391A JP H08289391 A JPH08289391 A JP H08289391A JP 8430195 A JP8430195 A JP 8430195A JP 8430195 A JP8430195 A JP 8430195A JP H08289391 A JPH08289391 A JP H08289391A
Authority
JP
Japan
Prior art keywords
diaphragm
boron nitride
thermoplastic resin
density
superior
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
Application number
JP8430195A
Other languages
Japanese (ja)
Inventor
Tokuyuki Yamaguchi
徳幸 山口
Koichi Shimizu
晃一 清水
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denka Co Ltd
Original Assignee
Denki Kagaku Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Denki Kagaku Kogyo KK filed Critical Denki Kagaku Kogyo KK
Priority to JP8430195A priority Critical patent/JPH08289391A/en
Publication of JPH08289391A publication Critical patent/JPH08289391A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To provide the diaphragm which is superior in balance of the density, the acoustic speed, and the internal loss and is superior in wetproof property and productivity by using a thermoplastic resin plastic material containing specific wt.% boron nitride as the material of the diaphragm. CONSTITUTION: The thermoplastic resin to be used has properties of a low density, a large internal loss, and a high rigidity. It is an independent polymer like a polypropylene or a poly-4-methylpentene-1, a copolymer essentially consisting of the constitution monomer of this polymer, or a mixture of them. The addition quantity of boron nitride powder is 5 to 50wt.% of the thermoplastic resin composition. Preferably, 10 to 30wt.% boron nitride is added to obtain the speaker diaphragm balanced with respect to the loss coefficient and the acoustic speed of molded goods. Thus, the speaker diaphragm is obtained which is superior in balance of the density, the acoustic speed, and the internal loss which control the acoustic characteristic and is superior in wetproof property and productivity.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明はスピーカーの振動板に関
するものであり、従来使用されているコーン紙の欠点で
あった耐水性、生産性を克服しかつ音響特性に優れたス
ピーカー振動板を提供する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker diaphragm, and provides a speaker diaphragm that overcomes the drawbacks of the conventionally used cone paper such as water resistance and productivity and has excellent acoustic characteristics. To do.

【0002】[0002]

【従来の技術】従来スピーカーの振動板に用いられてい
る材料としては紙、金属、樹脂など多種多様な素材が利
用されているが、音響特性が優れたものを得るには、そ
の材料には密度が小さく音速と内部損失が大きいことが
要求される。スピーカーはその背部に配置するボイスコ
イルと磁石により電気信号を振動運動に変換させ振動板
が動作することにより音声が発生する。振動板が重いと
振動させるために大きな力が必要になるため大きな磁
石、または強力な磁石を必要とし、スピーカーの軽量化
やコストダウンの障害となる。このため振動板はまず軽
い事が求められ、このため素材としては密度が小さいこ
とが求められる。振動板が振動すると特定の周波数帯で
生ずる共振振動により歪み音が発生し、その周波数帯の
音声を忠実に再現できなくなる。このため振動板が共振
振動を起こさない周波数帯を広くとれる事が求められ
る。材料特性上は音速(縦伝搬速度)が大きいほど共振
周波数が高周波数側にシフトするため音声の忠実な再現
領域を広げることができ、このため音速が大きい素材が
求められる。しかし共振振動が無くなるわけではないの
でこの悪影響を抑えるためには、さらに発生した共振振
動を速く減衰させる必要がある。材料特性上この共振振
動の減衰は材料の内部損失が大きいほど速く、このため
振動板の素材には内部損失の大きな材料が求められる。
スピーカー振動板には音響特性に関して以上の説明であ
げたような材料特性(密度、音速、内部損失)が必要と
されるが、実際にはこれらの必要物性は互いに相反する
場合が多いこと、また耐久性、耐熱性、製造安定性とい
った実用上の問題がさらに関係してくるために材料選択
の幅を狭くしている。
2. Description of the Related Art A wide variety of materials such as paper, metal, and resin have been used as materials conventionally used for speaker diaphragms. It is required to have low density and high sound velocity and internal loss. The speaker produces voice by converting an electric signal into an oscillating motion by a voice coil and a magnet arranged on the back of the speaker and operating the diaphragm. If the diaphragm is heavy, a large force is required to vibrate it, so a large magnet or a strong magnet is required, which is an obstacle to weight reduction and cost reduction of the speaker. For this reason, the diaphragm is first required to be light, and therefore the material is required to have low density. When the diaphragm vibrates, a resonant sound generated in a specific frequency band causes a distorted sound, making it impossible to faithfully reproduce the sound in that frequency band. For this reason, it is required that the diaphragm can have a wide frequency band in which resonance vibration does not occur. In terms of material characteristics, the higher the sound velocity (longitudinal propagation velocity), the more the resonance frequency shifts to the high frequency side, so that the faithful reproduction area of the sound can be widened. Therefore, a material having a high sound velocity is required. However, since the resonance vibration does not disappear, it is necessary to further damp the generated resonance vibration in order to suppress this adverse effect. Due to the material characteristics, the greater the internal loss of the material, the faster the damping of the resonance vibration. Therefore, a material having a large internal loss is required for the material of the diaphragm.
The speaker diaphragm requires the material characteristics (density, sound velocity, internal loss) mentioned above regarding acoustic characteristics, but in reality, these necessary physical properties often conflict with each other. Since practical problems such as durability, heat resistance, and manufacturing stability become more relevant, the range of material selection is narrowed.

【0003】適度な内部損失と音速をもち密度が小さい
特徴をもつコーン紙は広く一般的に振動板として用いら
れてきたが、コーン紙は耐湿性に劣り、また原材料の品
質を均一に保つのが難しいため製品特性のバラツキが生
じ易いという欠点がある。
Cone paper, which has characteristics of moderate internal loss, sound velocity and low density, has been widely used as a diaphragm, but the cone paper has poor moisture resistance and keeps the quality of raw materials uniform. However, there is a drawback in that variations in product characteristics are likely to occur because it is difficult.

【0004】一方金属材料は他の材料に比べてヤング率
が極めて大きく、これを用いた振動板は高音の再生領域
が大きいという特徴を持つが、逆に低音再生領域が小さ
い。また内部損失が小さいために特定の周波数帯にひず
みを生じ易い。さらに密度も大きいため音声変換効率が
悪いなどの欠点があり、一部高音用領域のスピーカー振
動板として使われているにすぎない。
On the other hand, the Young's modulus of a metal material is extremely larger than that of other materials, and a diaphragm using the same has a characteristic that a high-pitched sound reproduction region is large, but conversely, a low-pitched sound reproduction region is small. Moreover, since the internal loss is small, distortion is likely to occur in a specific frequency band. In addition, it has a drawback that the voice conversion efficiency is poor due to its high density, and it is only used as a speaker diaphragm in the high frequency range.

【0005】樹脂材料は金属に比べると密度も小さく内
部損失も大きい材料として振動板に用いられており例え
ばポリプロピレンなどがその代表的な樹脂になってい
る。ポリプロピレンを材料とした振動板はコーン紙の欠
点であった耐湿性や製造安定性といった欠点を克服でき
る(特開昭58−3499号公報)。しかしポリプロピ
レン単独ではヤング率が低いため音速がコーン紙より小
さく音響特性に劣る。
A resin material is used for the diaphragm as a material having a smaller density and a larger internal loss than metal, and polypropylene is a typical resin. A diaphragm made of polypropylene can overcome the drawbacks of cone paper such as moisture resistance and manufacturing stability (Japanese Patent Laid-Open No. 58-3499). However, since polypropylene alone has a low Young's modulus, the sound velocity is smaller than that of cone paper and the acoustic characteristics are inferior.

【0006】[0006]

【発明が解決しようとする課題】これらの欠点を改良す
るために従来の技術として樹脂材料に様々なフィラーを
添加する方法が試みられてきた。添加されるフィラーと
しては例えばマイカ、タルク、炭素繊維等が上げられ
る。しかしこれらフィラーの添加によるヤング率の向上
とともに音速が向上するが、内部損失が小さくなること
と密度が大きくなる弊害が生ずる。本発明はフィラー強
化系熱可塑性樹脂を用いた振動板のこれらの欠点を改良
するものである。
In order to improve these drawbacks, a method of adding various fillers to a resin material has been tried as a conventional technique. Examples of the filler to be added include mica, talc, carbon fiber and the like. However, although the addition of these fillers improves the Young's modulus and improves the sound velocity, it has the adverse effect of reducing the internal loss and increasing the density. The present invention solves these drawbacks of the diaphragm using the filler-reinforced thermoplastic resin.

【0007】[0007]

【課題を解決するための手段】上記の課題に対して研究
を重ねた結果、窒化ホウ素粉を5〜50重量%含有した
熱可塑性樹脂組成物を振動板の材料に用いることにより
本発明を完成するに至った。
As a result of repeated studies on the above-mentioned problems, the present invention was completed by using a thermoplastic resin composition containing 5 to 50% by weight of boron nitride powder as a material for a diaphragm. Came to do.

【0008】即ち、本発明は、窒化ホウ素粉を5〜50
重量%の割合で含有する熱可塑性樹脂組成物で作られた
スピーカー振動板に関する。
That is, according to the present invention, the boron nitride powder is added in an amount of 5 to 50.
The present invention relates to a speaker diaphragm made of a thermoplastic resin composition which is contained in a weight percentage.

【0009】以下に本発明を詳細に説明する。本発明に
用いられる窒化ホウ素粉は、その結晶構造が六方晶、非
晶質、ウルツ型等の何れのものも使用可能であるが、好
ましくは六方晶構造を有するものである。窒化ホウ素粉
の添加量は熱可塑性樹脂組成物中5〜50重量%である
が、好ましくは10〜30重量%を添加したときに成形
品の損失係数(内部損失の大きさを表す指数)及び音速
のバランスがとれるものが得られる。また、窒化ホウ素
粉の純度、粒径及びアスペクト比については特に制限は
ないが、好ましくは、純度95%以上の粉体で粒径が
0.5μm以上アスペクト比5以上の高結晶窒化ホウ素
粉であり、特に好ましくは、純度が95%以上で粒径2
μm以上、アスペクト比10以上である六方晶窒化ホウ
素粉を用いたときに成形品の音速を効率よく向上する。
The present invention will be described in detail below. The boron nitride powder used in the present invention may have any crystal structure of hexagonal crystal, amorphous, wurtzite, etc., but preferably has a hexagonal crystal structure. The addition amount of the boron nitride powder is 5 to 50% by weight in the thermoplastic resin composition, but when the addition amount is preferably 10 to 30% by weight, the loss coefficient (index indicating the magnitude of internal loss) of the molded article and It is possible to obtain a sound velocity that is well balanced. The purity, particle size and aspect ratio of the boron nitride powder are not particularly limited, but preferably powder of purity 95% or more and highly crystalline boron nitride powder having a particle size of 0.5 μm or more and an aspect ratio 5 or more. Yes, and particularly preferably, the purity is 95% or more and the particle size is 2
When a hexagonal boron nitride powder having a micrometer or more and an aspect ratio of 10 or more is used, the sound velocity of a molded product is efficiently improved.

【0010】本発明に用いられる熱可塑性樹脂は振動板
として成形できるものであれば種類に制約がなく、以下
に示した熱可塑性樹脂より選ばれる少なくとも1種又は
2種以上からなる樹脂が用いられるが、特に好ましくは
低密度、高内部損失、高剛性の性質を有する、ポリプロ
ピレン、ポリ−4−メチルペンテン−1等の単独重合体
または上記重合体の構成モノマーを主成分とする共重合
体またはそれらの混合物等である。共重合体を構成する
他のモノマーとしては、ポリプロピレン、ポリ−4−メ
チルペンテン−1等の単独重合体を主成分とするモノマ
ーとは異なる他のモノマー(例えば、(メタ)α,β−
不飽和カルボン酸アルキルエステル、(メタ)α,β−
不飽和カルボン酸、無水マレイン酸、脂肪族ビニルエス
テル)が挙げられ、これらの共重合体モノマーは重合体
の結晶性を阻害しない範囲内で用いられる。また、該共
重合体はランダム、ブロックまたはグラフト共重合体で
あっても良い。熱可塑性樹脂の例としては、ポリカーボ
ネート、ポリテレフタル酸ブチレン、ポリテルフタル酸
エチレン、ポリアミド、ポリイミドアミド、ポリエーテ
ルイミド、ポリエーテルスルフォン、ポリエーテルエー
テルケトン、ポリビニルアルコール、ポリビニルブチラ
ール、ポリビニルホルマール、ポリアリレート、ポリウ
レタン、ポリイミド、ゴム変性ポリスチレン、ABS樹
脂、MBS樹脂、MABS樹脂、塩素化ポリエチレン、
フェノキシ樹脂、ポリエチレン、ポリプロピレン、ポリ
−4−メチルペンテン−1、ポリブタジエン、ポリブテ
ン、ポリイソプレン、ポリスチレン、ポリ−α−メチル
スチレン、ポリ塩化ビニル、ポリアクリロニトリル、ポ
リフェニレンオキシド、ポリアセタール、ポリフェニレ
ンスルフィド、ポリテロラフルオロエチレン、ポリビニ
リデンフルオライド、ポリビニルデンクロライド、ポリ
クロロプレン、ポリ(メタ)アクリル酸(エステル)、
ポリエステル、ポリエーテル、ポリスルフォン、ポリビ
ニルエーテル等の単独重合体または上記重合体の構成モ
ノマーを主成分とする共重合体またはそれらの混合物等
が挙げられる。共重合体を構成する他のモノマーとして
は、上記記載の単独重合体を主成分とするモノマーとは
異なる他のモノマーであり、これらの共重合体モノマー
は重合体の結晶性を阻害しない範囲内で用いられる。ま
た、該共重合体はランダム、ブロックまたはグラフト共
重合体であっても良い。
The thermoplastic resin used in the present invention is not limited in kind as long as it can be molded as a diaphragm, and at least one kind or two or more kinds of resins selected from the following thermoplastic resins are used. However, particularly preferably, having a property of low density, high internal loss and high rigidity, polypropylene, a homopolymer such as poly-4-methylpentene-1 or a copolymer containing a constituent monomer of the above polymer as a main component or A mixture of them and the like. The other monomer constituting the copolymer may be another monomer different from a monomer containing a homopolymer such as polypropylene or poly-4-methylpentene-1 as a main component (for example, (meth) α, β-
Unsaturated carboxylic acid alkyl ester, (meth) α, β-
Unsaturated carboxylic acid, maleic anhydride, and aliphatic vinyl ester), and these copolymer monomers are used within a range that does not impair the crystallinity of the polymer. Further, the copolymer may be a random, block or graft copolymer. Examples of the thermoplastic resin include polycarbonate, butylene of polyterephthalate, ethylene polyterphthalate, polyamide, polyimide amide, polyetherimide, polyethersulfone, polyetheretherketone, polyvinyl alcohol, polyvinyl butyral, polyvinyl formal, polyarylate, polyurethane. , Polyimide, rubber modified polystyrene, ABS resin, MBS resin, MABS resin, chlorinated polyethylene,
Phenoxy resin, polyethylene, polypropylene, poly-4-methylpentene-1, polybutadiene, polybutene, polyisoprene, polystyrene, poly-α-methylstyrene, polyvinyl chloride, polyacrylonitrile, polyphenylene oxide, polyacetal, polyphenylene sulfide, polyterolafluoro Ethylene, polyvinylidene fluoride, polyvinyl denchloride, polychloroprene, poly (meth) acrylic acid (ester),
Examples thereof include homopolymers of polyesters, polyethers, polysulfones, polyvinyl ethers, etc., copolymers containing the constituent monomers of the above polymers as main components, and mixtures thereof. The other monomer constituting the copolymer is another monomer different from the above-mentioned homopolymer-based monomer, and these copolymer monomers are within a range that does not impair the crystallinity of the polymer. Used in. Further, the copolymer may be a random, block or graft copolymer.

【0011】また本発明に用いられる熱可塑性樹脂と窒
化ホウ素粉からなる樹脂組成物の密度においては特に限
定がないが、好ましくは1.5g/cm3以下のもの、
さらに好ましくは1.2g/cm3以下のもの、特に好
ましくは1.1g/cm3以下のものを用いたときに音
速、損失係数のバランスがとれているものでありスピー
カー振動板として優れたものである。
The density of the resin composition comprising the thermoplastic resin and the boron nitride powder used in the present invention is not particularly limited, but preferably 1.5 g / cm 3 or less,
A speaker diaphragm having a good balance between the sound velocity and the loss coefficient when using a material of 1.2 g / cm 3 or less, particularly preferably 1.1 g / cm 3 or less, which is excellent as a speaker diaphragm. Is.

【0012】窒化ホウ素粉と熱可塑性樹脂を混合する方
法は公知のいかなる方法でもよい。例えば、混練ロー
ル、バンバリミキサー、ヘンシェルミキサー、リボンブ
レンダー、スーパーミキサー及びVブレンダー等でドラ
イブレンドしてもよく、さらに押出機で溶融してペレッ
ト化してもよい。なかでも単軸押出機や2軸押出機を用
いて溶融混練を行う方法が容易に混練、ペレット化が可
能であり優れているものであり好ましい。上記混合時に
各種添加剤例えば、顔料、安定剤、耐候剤等を加える事
はなんら問題がなくまた窒化ホウ素粉以外のフィラー例
えばマイカ、タルク、黒鉛、炭素繊維、ガラス繊維、な
どを複合添加することもなんら問題がない。
The method for mixing the boron nitride powder and the thermoplastic resin may be any known method. For example, dry blending may be performed with a kneading roll, a Banbury mixer, a Henschel mixer, a ribbon blender, a super mixer, a V blender, or the like, and further melting with an extruder and pelletization may be performed. Among them, the method of melt-kneading using a single-screw extruder or a twin-screw extruder is preferable because it can be easily kneaded and pelletized and is excellent. There is no problem to add various additives such as pigments, stabilizers, weathering agents and the like at the time of mixing, and fillers other than boron nitride powder such as mica, talc, graphite, carbon fiber, glass fiber, and the like should be added in combination. There is no problem.

【0013】さらに本発明に用いられる窒化ホウ素粉と
熱可塑性樹脂からなる樹脂組成物を振動板として成形す
る方法には制約がなく射出成形により容易に成形でき
る。またシート成形後、真空成形、プラグ成形、吹込成
形または圧空成形により振動板の必要形状に加工する事
も可能である。
Further, there is no restriction on the method of molding the resin composition comprising the boron nitride powder and the thermoplastic resin used in the present invention as the diaphragm, and the molding can be easily carried out by injection molding. Further, after forming the sheet, it is possible to process the diaphragm into a required shape by vacuum forming, plug forming, blow molding or pressure forming.

【0014】[0014]

【実施例】以下、本発明を実施例により詳細に説明す
る。但し、本発明は以下の実施例によって限定されるも
のではない。
EXAMPLES The present invention will be described in detail below with reference to examples. However, the present invention is not limited to the following examples.

【0015】尚、実施例、比較例で使用した熱可塑性樹
脂及び添加フィラーの名称とその内容について表1に示
す。以下の熱可塑性樹脂及び添加フィラーの名称は略称
を用いて説明することとする。
Table 1 shows the names and contents of the thermoplastic resins and additive fillers used in the examples and comparative examples. The names of the following thermoplastic resins and additive fillers will be explained using abbreviations.

【0016】[0016]

【表1】 [Table 1]

【0017】実施例1〜4及び比較例1〜6 表1に示す原材料をもとに表2及び表3に示す配合比率
でヘンシェルミキサーを用いブレンドし、2軸押出機
(TEM−35B:東芝機械(株)製)により押出温度
260℃、吐出量15kg/時間で溶融混練後ペレット
化した。このペレットを射出成形機(IS55−EP
N:東芝機械(株)製)を用い成形温度260℃、金型
温度60℃の条件で長さ120mm、厚さ3mm、幅1
2mmの短冊状成形体に成形加工し評価用サンプルとし
た。
Examples 1 to 4 and Comparative Examples 1 to 6 Based on the raw materials shown in Table 1, blended in a blending ratio shown in Tables 2 and 3 using a Henschel mixer, and a twin-screw extruder (TEM-35B: Toshiba). Extrusion temperature of 260 ° C. and discharge rate of 15 kg / hour were melt-kneaded and pelletized by a machine. Injection molding machine (IS55-EP
N: Toshiba Machine Co., Ltd.), molding temperature of 260 ° C., mold temperature of 60 ° C., length 120 mm, thickness 3 mm, width 1
It was molded into a strip-shaped molded body of 2 mm and used as an evaluation sample.

【0018】これらのサンプルについてスピーカー振動
板の性能に関係する材料物性である密度、ヤング率、音
速、内部損失について評価した。ここで密度はJIS−
K7112A法に従い測定を行い、またヤング率および
損失係数を中央加振法を用いた伝達関数測定装置(WC
A損失係数測定システム/A&D社製)により測定し
た。測定の際の環境は20℃、湿度65%であり、測定
に用いた振動モードは1次の共振モードである。さらに
測定したヤング率と密度から以下の式1により音速を求
めた。
These samples were evaluated for density, Young's modulus, sound velocity, and internal loss, which are material properties related to the performance of the speaker diaphragm. Here, the density is JIS-
K7112A method is used for measurement, and Young's modulus and loss coefficient are measured by a transfer function measuring device (WC
A loss coefficient measurement system / manufactured by A & D). The environment at the time of measurement is 20 ° C. and the humidity is 65%, and the vibration mode used for the measurement is the primary resonance mode. Further, the sound velocity was calculated from the measured Young's modulus and density by the following formula 1.

【0019】 音速(縦伝播速度:m/sec)=(E/ρ)1/2 (式1) E:ヤング率(N/m2) ρ:密度(Kg/m3Sound velocity (longitudinal propagation velocity: m / sec) = (E / ρ) 1/2 (Equation 1) E: Young's modulus (N / m 2 ) ρ: Density (Kg / m 3 )

【0020】表2に実施例、表3に比較例の測定結果を
示す。
Table 2 shows the measurement results of the examples, and Table 3 shows the measurement results of the comparative examples.

【0021】[0021]

【表2】 [Table 2]

【0022】[0022]

【表3】 [Table 3]

【0023】比較例1,比較例2は窒化ホウ素粉を含ま
ないPP単独重合体及びPPとTPXを重量比50:5
0で配合したサンプルであり、同樹脂を実施例1と同様
に成形加工し密度、音速、損失係数を測定した結果であ
る。これら樹脂単独で使用する場合、材料の音速が小さ
いことが振動板として問題となる点であった。又、比較
例3及び比較例4に示すようにマイカを補強剤として使
用することにより音速を向上することが出来るが、それ
により損失係数が小さくなり、さらに密度が大きくな
る。また、比較例5及び比較例6のように本発明で規定
する以外の窒化ホウ素粉量を用いたときには音速が小さ
いかサンプルの成形が出来ないものとなる。
In Comparative Examples 1 and 2, a PP homopolymer containing no boron nitride powder and PP and TPX in a weight ratio of 50: 5.
This is a sample blended with 0, and is the result of molding and processing the same resin as in Example 1 and measuring the density, sound velocity, and loss coefficient. When these resins are used alone, the low sound velocity of the material poses a problem for the diaphragm. Further, as shown in Comparative Examples 3 and 4, the sound velocity can be improved by using mica as a reinforcing agent, but this reduces the loss coefficient and further increases the density. When a boron nitride powder amount other than those specified in the present invention is used as in Comparative Examples 5 and 6, the sound velocity is low or the sample cannot be molded.

【0024】それに比べて本発明である熱可塑性樹脂に
窒化ホウ素粉を添加したものは、例えば実施例3及び実
施例4に示すようにマイカを同じ重量比で添加した比較
例3及び比較例4に比べて音速、損失係数ともに大き
く、また密度も小さく諸物性のバランスに優れたもので
あり、本発明で使用する素材が音響特性が優れているこ
とがわかる。
In comparison, the thermoplastic resin of the present invention to which boron nitride powder is added is, for example, Comparative Example 3 and Comparative Example 4 in which mica is added at the same weight ratio as shown in Examples 3 and 4. Compared with, the sound velocity and the loss coefficient are large, the density is small, and the balance of various physical properties is excellent, indicating that the material used in the present invention has excellent acoustic characteristics.

【0025】[0025]

【発明の効果】本発明のスピーカー振動板は音響特性を
支配する密度、音速、内部損失のバランスに優れかつ耐
湿性、生産性に優れた振動板である。
The speaker diaphragm of the present invention is a diaphragm which is excellent in the balance of density, sound velocity, and internal loss that dominates the acoustic characteristics, as well as in moisture resistance and productivity.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】窒化ホウ素粉を5〜50重量%の割合で含
有する熱可塑性樹脂組成物で作られたスピーカー振動
板。
1. A speaker diaphragm made of a thermoplastic resin composition containing boron nitride powder in an amount of 5 to 50% by weight.
【請求項2】熱可塑性樹脂が少なくともポリプロピレン
またはポリ−4−メチルペンテン−1の単独重合体また
は上記重合体の構成モノマーを主成分とする共重合体ま
たはそれらの混合物の1種からなる請求項1のスピーカ
ー振動板。
2. The thermoplastic resin comprises at least a homopolymer of polypropylene or poly-4-methylpentene-1, a copolymer having a monomer constituting the polymer as a main component, or a mixture thereof. 1 speaker diaphragm.
JP8430195A 1995-04-10 1995-04-10 Speaker diaphragm Pending JPH08289391A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8430195A JPH08289391A (en) 1995-04-10 1995-04-10 Speaker diaphragm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8430195A JPH08289391A (en) 1995-04-10 1995-04-10 Speaker diaphragm

Publications (1)

Publication Number Publication Date
JPH08289391A true JPH08289391A (en) 1996-11-01

Family

ID=13826663

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8430195A Pending JPH08289391A (en) 1995-04-10 1995-04-10 Speaker diaphragm

Country Status (1)

Country Link
JP (1) JPH08289391A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003348687A (en) * 2002-05-29 2003-12-05 Onkyo Corp Speaker diaphragm
JP2007321070A (en) * 2006-06-01 2007-12-13 Teijin Ltd Thermoplastic resin composite composition and its manufacturing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003348687A (en) * 2002-05-29 2003-12-05 Onkyo Corp Speaker diaphragm
JP2007321070A (en) * 2006-06-01 2007-12-13 Teijin Ltd Thermoplastic resin composite composition and its manufacturing method

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