JPH04373400A - Production of speaker diaphragm - Google Patents
Production of speaker diaphragmInfo
- Publication number
- JPH04373400A JPH04373400A JP3151769A JP15176991A JPH04373400A JP H04373400 A JPH04373400 A JP H04373400A JP 3151769 A JP3151769 A JP 3151769A JP 15176991 A JP15176991 A JP 15176991A JP H04373400 A JPH04373400 A JP H04373400A
- Authority
- JP
- Japan
- Prior art keywords
- speaker diaphragm
- coil bobbin
- cone
- weight
- thermoplastic resin
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 18
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 18
- 229920000106 Liquid crystal polymer Polymers 0.000 claims abstract description 16
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 claims abstract description 16
- 239000012765 fibrous filler Substances 0.000 claims abstract description 12
- 238000001746 injection moulding Methods 0.000 claims abstract description 10
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 5
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 13
- -1 polypropylene Polymers 0.000 description 13
- 229920005989 resin Polymers 0.000 description 13
- 239000011347 resin Substances 0.000 description 13
- 238000002347 injection Methods 0.000 description 12
- 239000007924 injection Substances 0.000 description 12
- 238000000465 moulding Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 8
- 229920000049 Carbon (fiber) Polymers 0.000 description 6
- 239000004917 carbon fiber Substances 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000008188 pellet Substances 0.000 description 6
- 239000000945 filler Substances 0.000 description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 description 5
- 239000005020 polyethylene terephthalate Substances 0.000 description 5
- 239000004642 Polyimide Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 4
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- 229920001721 polyimide Polymers 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000010445 mica Substances 0.000 description 3
- 229910052618 mica group Inorganic materials 0.000 description 3
- FJKROLUGYXJWQN-UHFFFAOYSA-N 4-hydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 239000004695 Polyether sulfone Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920002492 poly(sulfone) Polymers 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 229920006393 polyether sulfone Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 229940090248 4-hydroxybenzoic acid Drugs 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- OXBIGOITHYOHGV-UHFFFAOYSA-N acetic acid;naphthalene Chemical compound CC(O)=O.CC(O)=O.C1=CC=CC2=CC=CC=C21 OXBIGOITHYOHGV-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- VCCBEIPGXKNHFW-UHFFFAOYSA-N biphenyl-4,4'-diol Chemical compound C1=CC(O)=CC=C1C1=CC=C(O)C=C1 VCCBEIPGXKNHFW-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、各種の音響機器に用
いられるスピ−カ振動板の製造方法に関するものである
。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing speaker diaphragms used in various types of audio equipment.
【０００２】0002
【従来の技術】従来、スピ−カ振動板は、図３に示すよ
うに異種材料から成るコイルボビン部３とコーン部４が
接着剤によって接合され形成されている。スピ−カの動
作原理は、まず音響信号に対応する電流がコイルボビン
部３に巻かれたボイスコイルに流れる。この電流によっ
て磁気回路の狭い隙間に納められているコイルボビン部
３に力が作用し、コイルボビン部３と接合されたコーン
部４が前後に振動し、音を放射する。2. Description of the Related Art Conventionally, a speaker diaphragm is formed by bonding a coil bobbin portion 3 and a cone portion 4 made of different materials with an adhesive, as shown in FIG. The principle of operation of the speaker is that a current corresponding to an acoustic signal flows through a voice coil wound around a coil bobbin section 3. This current applies force to the coil bobbin section 3 housed in the narrow gap of the magnetic circuit, causing the cone section 4 joined to the coil bobbin section 3 to vibrate back and forth, emitting sound.
【０００３】スピ−カ振動板の性能としてピストン運動
領域を広げるために、コーン部４の比弾性率Ｅ／Ｄ（Ｅ
：弾性率、Ｄ：密度）がなるべく大きく、高音域の周波
数特性を滑らかにするために適度の内部損失を有するこ
とがあげられる。このコーン部４のＥ／Ｄを大きくする
目的で、紙パルプやプラスチックに炭素繊維やマイカな
どの無機質充填材を混入する方法をとってきた。また、
コイルボビン部３は、ボイスコイルによる発熱のため、
紙に代わってマイカ／エポキシ樹脂、ポリアミドイミド
／ガラス繊維、ポリイミドなどの耐熱性の高い材料を用
いる。[0003] In order to expand the piston movement range as a performance of the speaker diaphragm, the specific elastic modulus E/D (E
: elastic modulus, D: density) as large as possible, and have a moderate internal loss in order to smooth the frequency characteristics in the high frequency range. In order to increase the E/D of the cone portion 4, a method has been adopted in which an inorganic filler such as carbon fiber or mica is mixed into paper pulp or plastic. Also,
The coil bobbin section 3 generates heat due to the voice coil.
Instead of paper, highly heat-resistant materials such as mica/epoxy resin, polyamideimide/glass fiber, and polyimide are used.
【０００４】一方、コイルボビン部３とコーン部４を一
体化する方法として、特開昭６２−５６０９８号公報に
示すものが報告されている。これは炭素粉末によってコ
イルボビン部３とコーン部４を別々に成形した後、両者
を高い炭素残査収率を示す物質で接着して複合体を形成
し、これを焼成して得る方法である。On the other hand, as a method for integrating the coil bobbin section 3 and the cone section 4, a method shown in Japanese Patent Laid-Open No. 62-56098 has been reported. This is a method in which a coil bobbin part 3 and a cone part 4 are separately molded using carbon powder, and then both are bonded together with a substance showing a high carbon residue yield to form a composite body, which is then fired.
【０００５】[0005]
【発明が解決しようとする課題】従来のスピ−カ振動板
は、以上のようにコイルボビン部３とコーン部４が異種
材料で構成され、両者が接着剤で貼り合わされているた
め、コーン部４のＥ／Ｄを向上させても、スピ−カ振動
板の音圧−周波数特性は、接着層による振動の損失のた
め優れた特性が得られないという問題点があった。また
、特開昭６２−５６０９８号公報によるコイルボビン部
３とコーン部４を一体化する方法は、工程が複雑であり
生産性に問題があった。[Problems to be Solved by the Invention] In the conventional speaker diaphragm, as described above, the coil bobbin part 3 and the cone part 4 are made of different materials and are bonded together with an adhesive. Even if the E/D of the speaker diaphragm is improved, there is a problem in that excellent sound pressure-frequency characteristics of the speaker diaphragm cannot be obtained due to vibration loss due to the adhesive layer. Further, the method of integrating the coil bobbin portion 3 and the cone portion 4 according to Japanese Patent Application Laid-Open No. 62-56098 has a complicated process and has a problem in productivity.
【０００６】この発明は、上記ような従来の問題点を解
決するためになされたもので、音圧−周波数特性に優れ
たスピ−カ振動板を製造でき、かつ生産性を向上して安
価に得ることができるスピーカ振動板の製造方法を提供
することを目的とするものである。The present invention was made to solve the above-mentioned conventional problems, and it is possible to manufacture a speaker diaphragm with excellent sound pressure-frequency characteristics, improve productivity, and at low cost. It is an object of the present invention to provide a method for manufacturing a speaker diaphragm that can be obtained.
【０００７】[0007]
【課題を解決するための手段】この発明に係るスピ−カ
振動板の製造方法は、５〜４０重量％の繊維状の充填材
を含む熱可塑性樹脂を材料とし、射出成形法によってコ
イルボビン部とコーン部とを一体に成形したものである
。[Means for Solving the Problems] A method for manufacturing a speaker diaphragm according to the present invention uses a thermoplastic resin containing 5 to 40% by weight of a fibrous filler as a material, and forms a coil bobbin part by injection molding. The cone part is integrally molded.
【０００８】また、５〜４０重量％の繊維状の充填材と
１０重量％以上の熱可塑性の液晶ポリマ−を含む熱可塑
性樹脂を材料とし、射出成形法によってコイルボビン部
とコーン部とを一体に成形したものである。[0008] Furthermore, the coil bobbin part and the cone part are integrally made by injection molding using a thermoplastic resin containing 5 to 40% by weight of a fibrous filler and 10% by weight or more of a thermoplastic liquid crystal polymer. It is molded.
【０００９】また、コイルボビン部とコーン部とを一体
に構成した成形型のコイルボビン側中央部より材料を注
入し、材料の流動がコイルボビン部を経由してコーン部
へ充填していくように成形することを特徴とするもので
ある。[0009] Also, the material is injected from the center part on the coil bobbin side of a mold in which the coil bobbin part and the cone part are integrated, and the material is formed so that the flow of the material fills the cone part via the coil bobbin part. It is characterized by this.
【００１０】0010
【作用】上記のように構成されたスピ−カ振動板の製造
方法によれば、熱可塑性樹脂を用いてコイルボビン部と
コーン部が一体化したスピ−カ振動板を射出成形によっ
て製造するため、コイルボビン部とコーン部との接着層
が無く、振動の損失が無くなり、音質に優れたスピ−カ
振動板を得ることができる。また熱可塑性樹脂の中でも
液晶ポリマ−を用いると、液晶ポリマ−が配向してＥ／
Ｄが向上し、更に音質に優れたスピ−カ振動板を製造す
ることができる。[Function] According to the method for manufacturing the speaker diaphragm constructed as described above, the speaker diaphragm in which the coil bobbin part and the cone part are integrated using thermoplastic resin is manufactured by injection molding. There is no adhesive layer between the coil bobbin part and the cone part, so there is no loss of vibration, and a speaker diaphragm with excellent sound quality can be obtained. Furthermore, when liquid crystal polymer is used among thermoplastic resins, the liquid crystal polymer becomes oriented and
It is possible to manufacture a speaker diaphragm with improved D and even better sound quality.
【００１１】また、コイルボビン部とコーン部を接着す
る工程や接着剤が不用となるため、製造工程の簡略化を
図ることができ、生産性に優れた安価なスピ−カ振動板
の製造方法を提供できる。[0011] Furthermore, since the step of gluing the coil bobbin part and the cone part and the need for adhesive, the manufacturing process can be simplified, and an inexpensive method of manufacturing a speaker diaphragm with excellent productivity can be achieved. Can be provided.
【００１２】0012
【実施例】図１はこの発明の一実施例に係わるスピ−カ
振動板を成形して製造する時の成形型の樹脂流動部を示
す斜視図であり、１は注入部、２は成形部である。この
成形型はコイルボビン部２ａとコーン部２ｂとが一体に
構成されており、成形型のコイルボビン側中央部の注入
部１より材料を注入し、材料の流動がコイルボビン部２
ａを経由してコーン部２ｂへ充填していくように成形す
る。即ち、図１に示すような成形型に注入部１から繊維
状の充填材を５〜４０重量％含む熱可塑性樹脂のスピ−
カ振動板材料を溶融状態で注入すると、ポリマ−の流れ
は拡大流れとなり、図１に示す矢印Ｙ方向にポリマ−が
配向し、かつコイルボビン部２ａとコーン部２ｂが一体
化した成形品を得ることができる。[Embodiment] FIG. 1 is a perspective view showing a resin flowing part of a mold when molding and manufacturing a speaker diaphragm according to an embodiment of the present invention, where 1 is an injection part and 2 is a molding part. It is. This mold has a coil bobbin part 2a and a cone part 2b integrally constructed, and the material is injected from the injection part 1 at the center of the mold on the coil bobbin side, and the flow of the material flows into the coil bobbin part 2.
It is molded so that it is filled into the cone portion 2b via a. That is, a thermoplastic resin spout containing 5 to 40% by weight of a fibrous filler is poured into a mold as shown in FIG.
When the diaphragm material is injected in a molten state, the flow of the polymer becomes an expanded flow, and a molded product is obtained in which the polymer is oriented in the direction of the arrow Y shown in FIG. 1 and the coil bobbin part 2a and the cone part 2b are integrated. be able to.
【００１３】また、この発明によれば、ポリマ−中に繊
維状の充填材を混入しているため、繊維状の充填材が成
形時のポリマ−の配向を安定に均一化させる効果がある
。Furthermore, according to the present invention, since the fibrous filler is mixed into the polymer, the fibrous filler has the effect of stably and uniformizing the orientation of the polymer during molding.
【００１４】この発明を実施する際に用いられる熱可塑
性樹脂としては、例えばポリプロピレン、ポリエチレン
、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、ポリスチレン、ポリサルホン、ポリフェニレン
サルファイド、ポリイミド、ポリアミド、ポリカーボネ
ート、ポリエーテルサルホン等の公知または市販の熱可
塑性樹脂を用いることができる。[0014] As the thermoplastic resin used in carrying out the present invention, known examples include polypropylene, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polysulfone, polyphenylene sulfide, polyimide, polyamide, polycarbonate, polyether sulfone, and the like. Alternatively, a commercially available thermoplastic resin can be used.
【００１５】また、この発明を実施する際に用いられる
液晶ポリマ−としては、熱可塑性を示す液晶ポリマーが
用いられる。この例としては、例えば、ポリエチレンテ
レフタレートとパラヒドロキシ安息香酸の共重合体、ポ
リエチレンテレフタレートとパラアセトキシ安息香酸の
共重合体、パラアセトキシ安息香酸、テレフタル酸とナ
フタレンジアセテートの共重合体、テレフタル酸とパラ
オキシ安息香酸とＰ，Ｐ’−ビフェノールからなるポリ
エステルなどがあり、公知または市販されている熱互変
性を示す液晶ポリマーを用いることができる。Further, as the liquid crystal polymer used in carrying out the present invention, a liquid crystal polymer exhibiting thermoplasticity is used. Examples include copolymers of polyethylene terephthalate and parahydroxybenzoic acid, copolymers of polyethylene terephthalate and paraacetoxybenzoic acid, paraacetoxybenzoic acid, copolymers of terephthalic acid and naphthalene diacetate, copolymers of terephthalic acid and There are polyesters made of paraoxybenzoic acid and P,P'-biphenol, and known or commercially available liquid crystal polymers exhibiting thermotropy can be used.
【００１６】また、上記熱可塑性の液晶ポリマーは充填
材を除いた全体がこれであるか、これを１０重量％以上
含有させなければならず、１０重量％未満では液晶ポリ
マーの配向を安定に均一化させるというこの発明の効果
が得られない。この液晶ポリマーは多いほうが望ましく
、充填材を除いた全体がこれである場合のものを実施例
２に示している。また、この発明の実施例では、これら
の液晶ポリマーと別の熱可塑性樹脂をポリマーブレンド
しても同様の効果を得ることができる。ここで用いるこ
とができる熱可塑性の樹脂としては、ポリプロピレン、
ポリエチレン、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、ポリスチレン、ポリサルホン、ポ
リフェニレンサルファイド、ポリイミド、ポリアミド、
ポリカーボネート、ポリエーテルサルホン等の公知の熱
可塑性樹脂であれば特に制限されない。[0016] The thermoplastic liquid crystal polymer must consist of this in its entirety, excluding the filler, or must contain 10% by weight or more of this, and if it is less than 10% by weight, the alignment of the liquid crystal polymer will not be stable and uniform. The effect of this invention, which is to increase the It is desirable to have a large amount of this liquid crystal polymer, and Example 2 shows a case in which the entire liquid crystal polymer except for the filler is made of this. Furthermore, in the embodiments of the present invention, similar effects can be obtained by blending these liquid crystal polymers with another thermoplastic resin. Thermoplastic resins that can be used here include polypropylene,
Polyethylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polysulfone, polyphenylene sulfide, polyimide, polyamide,
There is no particular restriction as long as it is a known thermoplastic resin such as polycarbonate or polyether sulfone.
【００１７】この発明を実施する際に用いる繊維状また
は薄片状の充填材としては、一般に樹脂に充填される公
知のもでよく、例えばガラス繊維、炭素繊維、ウォラス
トナイト、タルク、マイカ、ガラス箔、各種のウィスカ
、グラファイト等の市販されているものでよい。この繊
維状の充填材の配合量としては５〜４０重量％が好まし
く、５重量％未満ではポリマーの配向を安定に均一化さ
せるというこの発明の効果が得られない。また、４０重
量％を越えると樹脂の流動性が低下し、この発明の目的
とする射出成形法による効果が得られない。なお、この
発明では、必要に応じて熱または光に対する安定剤や、
充填材とのカップリング剤、あるいは内部剥離剤等の種
々の添加剤をこの目的に反しない範囲で加えることがで
きる。The fibrous or flaky filler used in carrying out this invention may be any of the known fillers that are generally filled in resins, such as glass fiber, carbon fiber, wollastonite, talc, mica, glass, etc. Commercially available materials such as foil, various types of whiskers, and graphite may be used. The blending amount of this fibrous filler is preferably 5 to 40% by weight, and if it is less than 5% by weight, the effect of the present invention of stably and uniformizing the orientation of the polymer cannot be obtained. Moreover, if it exceeds 40% by weight, the fluidity of the resin will decrease, and the effect of the injection molding method that is the object of the present invention cannot be obtained. In addition, in this invention, a stabilizer against heat or light,
Various additives such as a coupling agent for the filler or an internal release agent can be added within a range that does not contradict this purpose.
【００１８】この発明で用いることのできる型としては
、熱可塑性樹脂の成形に一般に用いられている公知の型
であれば制限されない。また、型に樹脂を注入する方法
としては射出成形法を用いており、溶融樹脂の流れの速
度を十分に制御できる。以下に、具体的な実施例をあげ
て説明する。The mold that can be used in the present invention is not limited as long as it is a known mold that is generally used for molding thermoplastic resins. Furthermore, injection molding is used as a method for injecting the resin into the mold, and the flow rate of the molten resin can be sufficiently controlled. Below, specific examples will be given and explained.
【００１９】実施例１．熱可塑性樹脂であるポリプロピ
レン樹脂，商品名ＢＣ０３Ｃ（三菱油化株式会社製）に
長さ６ｍｍの炭素繊維チョップトストランドを用いて重
量で５％添加した後、スクリュー径３０ｍｍの押し出し
機を用いて２１０℃で押し出してペレットとした。この
ペレットを用いてコイルボビン部２ａの内径３０ｍｍ、
長さ３０ｍｍ、コーン部２ｂの外径１３０ｍｍ、厚さ０
．３ｍｍの成形品形状を有し、中央部からポリマ−を注
入できる金属性の金型に、樹脂温度２１０℃、射出圧力
１００ＭＰａ、射出時間５秒、金型温度８０℃、冷却時
間３０秒で成形してこの発明の実施例１によるスピ−カ
振動板を得る。このスピ−カ振動板の音圧（ｄＢ）−周
波数（Ｈｚ）特性を求めたものを図２中の曲線Ａに示す
。図２で縦軸はデシベルで表す音圧（ｄＢ）、横軸はヘ
ルツで表す周波数（Ｈｚ）である。Example 1. After adding 5% by weight of a thermoplastic resin, polypropylene resin, trade name BC03C (manufactured by Mitsubishi Yuka Co., Ltd.) using chopped carbon fiber strands with a length of 6 mm, 210% by weight was added using an extruder with a screw diameter of 30 mm. It was extruded at °C to form pellets. Using this pellet, the inner diameter of the coil bobbin part 2a is 30 mm,
Length 30mm, outer diameter of cone part 2b 130mm, thickness 0
．． Molded into a metal mold with a 3 mm molded shape that allows polymer injection from the center using resin temperature of 210°C, injection pressure of 100 MPa, injection time of 5 seconds, mold temperature of 80°C, and cooling time of 30 seconds. Thus, a speaker diaphragm according to Example 1 of the present invention is obtained. Curve A in FIG. 2 shows the sound pressure (dB)-frequency (Hz) characteristics of this speaker diaphragm. In FIG. 2, the vertical axis is sound pressure (dB) expressed in decibels, and the horizontal axis is frequency (Hz) expressed in hertz.
【００２０】実施例２．液晶ポリマ−である商品名ベク
トラＡ９５０（ポリプラスチック株式会社製）に長さ３
ｍｍの炭素繊維チョプドストランドを用いて重量で４０
％を添加した後、スクリュー径３０ｍｍの押し出し機を
用いて３１０℃で押し出してペレットとした。このペレ
ットを、樹脂温度３１０℃、射出圧力１３０ＭＰａ、射
出時間５秒、金型温度１２０℃、冷却時間３０秒で成形
してこの発明の実施例２によるスピ−カ振動板を得る。
このスピ−カ振動板の音圧（ｄＢ）−周波数（Ｈｚ）特
性を求めたものを図２中の曲線Ｂに示す。Example 2. Product name Vectra A950 (manufactured by Polyplastics Co., Ltd.), which is a liquid crystal polymer, has a length of 3.
40 mm by weight using carbon fiber chopped strands
%, extrusion was performed at 310° C. using an extruder with a screw diameter of 30 mm to obtain pellets. This pellet is molded at a resin temperature of 310 DEG C., an injection pressure of 130 MPa, an injection time of 5 seconds, a mold temperature of 120 DEG C., and a cooling time of 30 seconds to obtain a speaker diaphragm according to Example 2 of the present invention. Curve B in FIG. 2 shows the sound pressure (dB)-frequency (Hz) characteristics of this speaker diaphragm.
【００２１】実施例３．実施例２で作製した炭素繊維を
重量で４０％含む商品名ベクトラＡ９５０と、ベクトラ
Ａ９５０と、ポリエチレンテレフタレート樹脂，商品名
ＮＯＶＡＰＥＴ６０１０（三菱化成株式会社製）とを重
量で１０：８：２に混合した。これを、樹脂温度３１０
℃、射出圧力１５０ＭＰａ、射出時間５秒、金型温度１
１０℃、冷却時間３０秒で成形してこの発明の実施例３
によるスピ−カ振動板を得る。このスピ−カ振動板の音
圧（ｄＢ）−周波数（Ｈｚ）特性を求めたものを図２中
の曲線Ｃに示す。Example 3. Vectra A950 (trade name) containing 40% carbon fiber by weight produced in Example 2, Vectra A950, and polyethylene terephthalate resin (trade name NOVAPET6010 (manufactured by Mitsubishi Kasei Corporation)) were mixed in a ratio of 10:8:2 by weight. . This is done at a resin temperature of 310
℃, injection pressure 150MPa, injection time 5 seconds, mold temperature 1
Example 3 of this invention by molding at 10°C and cooling time of 30 seconds
Obtain a speaker diaphragm. Curve C in FIG. 2 shows the sound pressure (dB)-frequency (Hz) characteristics of this speaker diaphragm.
【００２２】比較例１．ポリプロピレン樹脂、商品名Ｂ
Ｃ０３Ｃ（三菱油化株式会社製）に長さ６ｍｍの炭素繊
維チョップトストランドを重量で３０％添加した後押し
出し機を用いて２１０℃で押し出してペレットとした。
このペレットを用いて、コーン部２ｂの形状を有する内
径３０ｍｍ、外径１３０ｍｍ、厚さ０．３ｍｍで、内径
部中央からポリマ−を注入できる金属性の型に、樹脂温
度２１０℃、射出圧力１００ＭＰａ、射出時間５秒、金
型温度８０℃、冷却時間３０秒で成形しコーン部２ｂを
作製した。また、ポリイミド積層板，商品名ＴＩＬ（東
レ株式会社製）で直径３０ｍｍ、長さ３０ｍｍのコイル
ボビン部２ａを作製した。次にこれらのコイルボビン部
２ａとコーン部２ｂをエポキシ系接着剤によって接合し
てスピ−カ振動板を得る。このスピ−カ振動板の音圧（
ｄＢ）−周波数（Ｈｚ）特性を図２中の曲線Ｄに示す。Comparative Example 1. Polypropylene resin, product name B
C03C (manufactured by Mitsubishi Yuka Co., Ltd.) was extruded into pellets at 210° C. using a push extruder in which 30% by weight of carbon fiber chopped strands having a length of 6 mm were added. Using this pellet, the resin temperature was 210°C and the injection pressure was 100 MPa, into a metal mold having the shape of a cone part 2b with an inner diameter of 30 mm, an outer diameter of 130 mm, and a thickness of 0.3 mm, into which polymer could be injected from the center of the inner diameter part. The cone portion 2b was produced by molding with an injection time of 5 seconds, a mold temperature of 80° C., and a cooling time of 30 seconds. Further, a coil bobbin portion 2a having a diameter of 30 mm and a length of 30 mm was fabricated using a polyimide laminate, trade name TIL (manufactured by Toray Industries, Inc.). Next, the coil bobbin portion 2a and the cone portion 2b are bonded together using an epoxy adhesive to obtain a speaker diaphragm. The sound pressure of this speaker diaphragm (
dB)-frequency (Hz) characteristics are shown in curve D in FIG.
【００２３】各材料の重量含有率を表１に示す。また、
図２から明らかなように、この発明の実施例によるスピ
−カ振動板は、コイルボビン部２ａとコーン部２ｂとが
一体化しているため、優れた周波数特性が得られる。さ
らに、実施例２（曲線Ｂ），実施例３（曲線Ｃ）のよう
に液晶ポリマ−を含んだものは、ポリマ−の大きな配向
により高域にのびがあり、あばれの少ない優れたスピ−
カ振動板が得られることがわかる。Table 1 shows the weight content of each material. Also,
As is clear from FIG. 2, the speaker diaphragm according to the embodiment of the present invention has excellent frequency characteristics because the coil bobbin portion 2a and the cone portion 2b are integrated. Furthermore, those containing liquid crystal polymer, such as Example 2 (Curve B) and Example 3 (Curve C), have a wide range in the high range due to the large orientation of the polymer, and have excellent speed with little vibration.
It can be seen that a strong diaphragm can be obtained.
【００２４】[0024]
【表１】[Table 1]
【００２５】[0025]
【発明の効果】以上のように、この発明によれば、５〜
４０重量％の繊維状の充填材を含む熱可塑性樹脂を材料
とし、射出成形法によってコイルボビン部とコーン部と
を一体に成形することにより、音圧−周波数特性に優れ
たスピ−カ振動板が得られ、また生産性に優れたスピ−
カ振動板の製造方法が得られる効果がある。[Effect of the invention] As described above, according to this invention, 5 to
A speaker diaphragm with excellent sound pressure-frequency characteristics is created by integrally molding the coil bobbin part and cone part by injection molding using thermoplastic resin containing 40% by weight of fibrous filler. high speed and high productivity
This has the effect of providing a method for manufacturing a diaphragm.
【００２６】また、さらに、５〜４０重量％の繊維状の
充填材と１０重量％以上の熱可塑性の液晶ポリマ−を含
む熱可塑性樹脂を材料とし、射出成形法によってコイル
ボビン部とコーン部とを一体に成形することにより、さ
らに音質に優れたスピ−カ振動板の製造方法が得られる
効果がある。[0026] Furthermore, the coil bobbin portion and the cone portion are formed by injection molding using a thermoplastic resin containing 5 to 40% by weight of a fibrous filler and 10% by weight or more of a thermoplastic liquid crystal polymer. By integrally molding, there is an effect that a method of manufacturing a speaker diaphragm with even better sound quality can be obtained.
【００２７】また、さらに、コイルボビン部とコーン部
を一体に構成した成形型のコイルボビン側中央部より材
料を注入し、材料の流動がコイルボビン部を経由してコ
ーン部へ充填していくように成形することにより、接着
工程を省略することができ、生産性に優れたスピ−カ振
動板の製造方法が得られる効果がある。Furthermore, the material is injected from the center part on the coil bobbin side of the mold in which the coil bobbin part and the cone part are integrated, and the material is formed so that the flow of the material fills the cone part via the coil bobbin part. By doing so, the adhesion step can be omitted, and a method of manufacturing a speaker diaphragm with excellent productivity can be obtained.
【図１】この発明の実施例１によるスピ−カ振動板の製
造方法に係る成形型の樹脂流動を示す斜視図である。FIG. 1 is a perspective view showing resin flow in a mold according to a method of manufacturing a speaker diaphragm according to Example 1 of the present invention.
【図２】この発明の実施例１〜３によるスピ−カ振動板
及び比較例によるスピ−カ振動板の音圧（ｄＢ）−周波
数（Ｈｚ）特性図である。FIG. 2 is a sound pressure (dB)-frequency (Hz) characteristic diagram of speaker diaphragms according to Examples 1 to 3 of the present invention and a speaker diaphragm according to a comparative example.
【図３】従来のスピ−カ振動板の構成図である。FIG. 3 is a configuration diagram of a conventional speaker diaphragm.
１ 注入部 ２ 成形部 ２ａ コイルボビン部 ２ｂ コーン部 1 Injection part 2 Molding part 2a Coil bobbin part 2b Cone part
Claims (3)
む熱可塑性樹脂を材料とし、射出成形法によってコイル
ボビン部とコーン部とを一体に成形したスピ−カ振動板
の製造方法。1. A method for manufacturing a speaker diaphragm, which is made of a thermoplastic resin containing 5 to 40% by weight of fibrous filler and has a coil bobbin portion and a cone portion integrally molded by injection molding.
０重量％以上の熱可塑性の液晶ポリマ−を含む熱可塑性
樹脂を材料とし、射出成形法によってコイルボビン部と
コーン部とを一体に成形したスピ−カ振動板の製造方法
。Claim 2: 5 to 40% by weight of a fibrous filler and 1
A method of manufacturing a speaker diaphragm, which is made of a thermoplastic resin containing 0% by weight or more of a thermoplastic liquid crystal polymer, and has a coil bobbin part and a cone part integrally molded by an injection molding method.
構成した成形型の上記コイルボビン側中央部より材料を
注入し、上記材料の流動が上記コイルボビン部を経由し
て上記コーン部へ充填していくように成形することを特
徴とする請求項第１項叉は第２項記載のスピ−カ振動板
の製造方法。[Claim 3] Material is injected from a center portion on the coil bobbin side of a mold that integrally comprises a coil bobbin portion and a cone portion, and the flow of the material fills the cone portion via the coil bobbin portion. A method of manufacturing a speaker diaphragm according to claim 1 or 2, characterized in that the speaker diaphragm is molded as follows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3151769A JPH04373400A (en) | 1991-06-24 | 1991-06-24 | Production of speaker diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3151769A JPH04373400A (en) | 1991-06-24 | 1991-06-24 | Production of speaker diaphragm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04373400A true JPH04373400A (en) | 1992-12-25 |
Family
ID=15525895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3151769A Pending JPH04373400A (en) | 1991-06-24 | 1991-06-24 | Production of speaker diaphragm |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04373400A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006033024A (en) * | 2004-07-12 | 2006-02-02 | Onkyo Corp | Speaker diaphragm and its manufacturing process |
| JP2018192588A (en) * | 2017-05-19 | 2018-12-06 | 上野製薬株式会社 | Surface modification method, ultrasonic transmission member and surface modification device |
-
1991
- 1991-06-24 JP JP3151769A patent/JPH04373400A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006033024A (en) * | 2004-07-12 | 2006-02-02 | Onkyo Corp | Speaker diaphragm and its manufacturing process |
| JP4534094B2 (en) * | 2004-07-12 | 2010-09-01 | オンキヨー株式会社 | Speaker diaphragm and manufacturing method thereof |
| JP2018192588A (en) * | 2017-05-19 | 2018-12-06 | 上野製薬株式会社 | Surface modification method, ultrasonic transmission member and surface modification device |
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