JPH0247999A - Diaphragm for speaker - Google Patents
Diaphragm for speakerInfo
- Publication number
- JPH0247999A JPH0247999A JP19864388A JP19864388A JPH0247999A JP H0247999 A JPH0247999 A JP H0247999A JP 19864388 A JP19864388 A JP 19864388A JP 19864388 A JP19864388 A JP 19864388A JP H0247999 A JPH0247999 A JP H0247999A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal polymer
- diaphragm
- elastic modulus
- thermotropic liquid
- 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
- 229920000106 Liquid crystal polymer Polymers 0.000 claims abstract description 23
- 239000000945 filler Substances 0.000 claims abstract description 22
- 239000004974 Thermotropic liquid crystal Substances 0.000 claims abstract description 19
- 238000001746 injection moulding Methods 0.000 claims abstract description 13
- 229910052628 phlogopite Inorganic materials 0.000 claims description 6
- 239000011342 resin composition Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 abstract description 13
- 229920005989 resin Polymers 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 8
- 239000010445 mica Substances 0.000 abstract description 6
- 229910052618 mica group Inorganic materials 0.000 abstract description 6
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 abstract description 4
- 229920000728 polyester Polymers 0.000 abstract description 4
- 239000004952 Polyamide Substances 0.000 abstract description 3
- 229920002647 polyamide Polymers 0.000 abstract description 3
- 229920005992 thermoplastic resin Polymers 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract 2
- 150000001875 compounds Chemical class 0.000 abstract 1
- 238000012856 packing Methods 0.000 abstract 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 10
- 239000004917 carbon fiber Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 9
- 238000000465 moulding Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 239000012765 fibrous filler Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- -1 polypropylene Polymers 0.000 description 5
- 238000004080 punching Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000000025 natural resin Substances 0.000 description 3
- 229920006149 polyester-amide block copolymer Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 125000001424 substituent group Chemical group 0.000 description 3
- 238000012360 testing method Methods 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000787 lecithin Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229940090248 4-hydroxybenzoic acid Drugs 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229920000265 Polyparaphenylene Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052627 muscovite Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920001470 polyketone Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Landscapes
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、音質が良く安価であり、かつ製品ロットのバ
ラつきの少ないスピーカー用振動板に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a speaker diaphragm that has good sound quality, is inexpensive, and has little variation among product lots.
スピーカー用振動板に要求される性能として、非弾性率
（Ｅ／ρ、Ｅ：弾性率、ρ：比重）が大きいこと、適当
に大きな内部損失（ｔａｎδ）を有すること、又、振動
板自身の重量が軽いこと（同じ体積ならばρが小さい事
）が必要である。The performance required of a speaker diaphragm is that it has a large inelastic modulus (E/ρ, E: elastic modulus, ρ: specific gravity), a suitably large internal loss (tan δ), and the diaphragm itself It is necessary that the weight is light (for the same volume, ρ is small).
従来、ρが比較的小さくＥが大きい材料としてアルミニ
ウム、ベリリウム、チタンの様な金属材料が知られ、又
、実際にスピーカー用振動板として使用されてきてはい
るが、ｔａｎδ が極めて小さいという問題が存在して
いた。一方、ｔａｎδ が大きい材料として紙がよく知
られているが弾性率が低くこのままではスピーカー用振
動板としては不十分であるので、弾性率を向上する目的
で近年炭素繊維を紙に混入する方法が取られてきた。Conventionally, metal materials such as aluminum, beryllium, and titanium have been known as materials with relatively small ρ and large E, and have actually been used as diaphragms for speakers, but they have the problem of extremely small tanδ. It existed. On the other hand, paper is well known as a material with a large tan δ, but its elastic modulus is low and as it is, it is insufficient as a speaker diaphragm, so in recent years a method of mixing carbon fiber into paper has been developed to improve the elastic modulus. It has been taken.
ポリプロピレン、ポリエステル等のプラごチック材料は
、比較的大きなｔａｎδ を有することが知られており
、射出成形法により安価な製造コストで、品質の均一な
スピーカー用振動板を大量に製造し得る可能性を有して
いるが、反面弾性率が低いという問題がある。Plastic materials such as polypropylene and polyester are known to have a relatively large tan δ, and it is possible to mass-produce loudspeaker diaphragms of uniform quality using injection molding at low manufacturing costs. However, there is a problem that the elastic modulus is low.
かかる問題点を解決するために、繊維状あるいは板状の
充填剤を混入する方法がいろいろ提案されている。しか
し、弾性率の向上効果はそれほど大きくなく、逆に溶融
粘度が上昇するので、射出成形における流動性の低下を
招き、そのためスピーカー用振動板の板厚を厚くせざる
を得なくなり振動板自体の重量が重くなってしまうとい
う欠点がある。In order to solve this problem, various methods have been proposed for incorporating fibrous or plate-like fillers. However, the effect of improving the elastic modulus is not so great, and on the contrary, the melt viscosity increases, leading to a decrease in fluidity during injection molding.As a result, the thickness of the speaker diaphragm must be increased, and the diaphragm itself The disadvantage is that it is heavy.
又、近年、炭素繊維の織物をエポキシ樹脂で含浸したい
わゆる炭素繊維エポキシプリプレグにて、エポキシ樹脂
を硬化することによりスピーカー用振動板を成形する方
法が提案されているが、材料費が極めて高価であるだけ
でなく、硬化時間が極めて長いために大量生産が困難で
あり、かつ又製品ロット間の厚み精度、硬化密度等にバ
ラつきが生じ易いので結果的に音質のパラつきが大きい
という問題点を有していた。In addition, in recent years, a method has been proposed in which speaker diaphragms are formed by curing the epoxy resin using so-called carbon fiber epoxy prepreg, which is made by impregnating carbon fiber fabric with epoxy resin, but the material cost is extremely high. Not only that, but the curing time is extremely long, making it difficult to mass-produce, and there is also a problem that variations in thickness accuracy, curing density, etc. between product lots tend to occur, resulting in large variations in sound quality. had.
一方、サーモトロビック液晶ポリマーよりスピーカー用
振動板を形成することは、例えば特開昭６２−７≠り２
り６号、特開昭６２−２０２６タタ号により公知である
が、これらは、各々、充填剤を含まないサーモトロビッ
ク液晶ポリマー 及び繊維状充填剤を含むサーモトロビ
ック液晶ポリマーに関するものである。On the other hand, it is possible to form a speaker diaphragm from a thermotropic liquid crystal polymer, for example, in JP-A-62-7≠RI2.
6 and JP-A-62-2026 Tata, which relate to filler-free thermotropic liquid crystal polymers and to thermotropic liquid crystal polymers containing fibrous fillers, respectively.
本発明者等は上記のような公知方法に対して追検討した
結果、充填剤を含まいサーモトロビック液晶ポリマー単
独あるいは他の熱可塑性ポリマーとのブレンドを用いて
射出成形により形成されたスピーカーは、なるほど振動
板表面外観は光沢があって美しく、樹脂の流動方向の弾
性率が高いのでスピーカーとして音質が極めて良い事を
認めたが、円周方向の弾性率、及び強度が低く、成形品
をスピーカー片に金型によって打抜く際に、割れ、ヒビ
等が入りやすいので裂品歩留まりが大幅に低下し工業的
にみて好ましい結果を得なかった。As a result of further investigation of the above-mentioned known methods, the present inventors found that a speaker formed by injection molding using a filler-containing thermotropic liquid crystal polymer alone or blended with other thermoplastic polymers. , I see that the surface appearance of the diaphragm is shiny and beautiful, and the resin has a high elastic modulus in the direction of flow, so the sound quality as a speaker is extremely good. When the speaker pieces are punched with a metal mold, cracks and the like tend to occur, resulting in a significant drop in the yield of broken pieces, resulting in unfavorable results from an industrial perspective.
一方、特開昭６２−２０２６？７号に記載されているよ
うに、炭素繊維あるいはガラス繊維等の繊維状充填剤は
、成形時のポリマーの配向を安定に均一化させる効果が
あり、半径方向とそれと直角方向の弾性率を向上させる
効果が認められた。更に、破断強度も大幅に向上するの
で成形品をスピーカー用振動板状に打ち抜く際に、割れ
、ヒビ等の発生がさほど認められず、良好であった。更
に、例えば炭素繊維を充填剤として使用する場合には、
その半径方向の弾性率は、極めて大きくなり、よシ好ま
しい結果をえた。しかしながら、かかる繊維状充填剤の
系は、その溶融粘度の増大効果が大きく、従って成形流
動性が低下して、実際のスピーカー用振動板を成形する
場合振動板厚みが厚くなってしまう。スピーカー用振動
板はその重量を可能な限り軽くしたいという目的に対し
て問題を生ずるのみならず、射出成形技術の面から射出
圧力、射出速度、ともに装置的に限界があり、そのため
更に大型の射出成形機を使用せざるを得す、更にその結
果として口径の大きなスピーカー用振動板を得ることが
できなくなり必ずしも好ましくない。On the other hand, as described in JP-A No. 62-2026-7, fibrous fillers such as carbon fibers or glass fibers have the effect of stably uniformizing the orientation of the polymer during molding, and The effect of improving the elastic modulus in the direction perpendicular to this was observed. Furthermore, the breaking strength was significantly improved, so that when the molded product was punched into the shape of a speaker diaphragm, no cracks or cracks were observed, and the result was good. Furthermore, when using carbon fiber as a filler, for example,
The elastic modulus in the radial direction was extremely large, giving a very favorable result. However, such a fibrous filler system has a large effect of increasing the melt viscosity, resulting in a decrease in molding fluidity and, when actually molding a diaphragm for a speaker, the thickness of the diaphragm becomes thick. The diaphragm for speakers not only poses a problem with the aim of reducing its weight as much as possible, but also has equipment limitations in terms of injection pressure and injection speed due to injection molding technology, which makes it difficult to make even larger injection molding plates. A molding machine has to be used, and as a result, it becomes impossible to obtain a loudspeaker diaphragm with a large diameter, which is not necessarily preferable.
本発明者等は、サーモトロビック液晶ポリマーに関する
かかる問題点に鑑み、射出成形法によって大量生産可能
であり、かつＥ／ρ及びｔａｎδの大きい音質に優れた
スピーカー用振動板を得るべく鋭意検討した結果、板状
充填剤を使用することにより、樹脂の流動方向と直角な
方向の弾性率、強度も向上し、二次加工工程における金
型打抜き工程において割れ、ヒビ等の問題も発生せず、
流動性も繊維状充填剤を使用した場合はど大幅に低下し
ないことを見いだし、本発明に到達した。In view of these problems regarding thermotropic liquid crystal polymers, the present inventors have conducted extensive studies in order to obtain a speaker diaphragm that can be mass-produced by injection molding, has large E/ρ and tan δ, and has excellent sound quality. As a result, by using a plate-shaped filler, the elastic modulus and strength in the direction perpendicular to the flow direction of the resin are improved, and problems such as cracks and cracks do not occur during the mold punching process in the secondary processing process.
It was discovered that the fluidity did not decrease significantly when a fibrous filler was used, and the present invention was achieved based on this finding.
即ち、本発明は、サーモトロビック液晶ポリマーを１０
重量％以上、かつ板状充填剤を７重量％以上含む樹脂組
成物を射出成形することにより形成されるスピーカー用
振動板に関するものである。That is, in the present invention, the thermotropic liquid crystal polymer is
The present invention relates to a speaker diaphragm formed by injection molding a resin composition containing at least 7% by weight of a plate-like filler.
サーモトロビック液晶ポリマーは、通常樹脂の流動方向
にその分子鎖が配向し、其の冷却固化過程において該分
子鎖の配向が凍結する。これにより配向方向の弾性率は
著しく増大する。In a thermotropic liquid crystal polymer, the molecular chains are usually oriented in the flow direction of the resin, and the orientation of the molecular chains is frozen during the cooling and solidification process. This significantly increases the elastic modulus in the orientation direction.
特に射出成形法によりスピーカー振動板を成形する場合
においては、振動板の板厚は／間取下とするのが好まし
く、この様な場合においては流動過程で特に配向がかか
り易いので、得られる振動板の弾性率は、流動方向に対
してはｒ〜２０ ｘ ／ ０’ ｄｙｎｅ／ｃｒｄにも
達する。又、サーモトロビック液晶ポリマーも通常のプ
ラスチックの一種であるので、例えばポリプロピレン、
ポリアミド等と同等ないしそれよりも大きな内部損失（
ｔａｎδ）を示す。Particularly when molding a speaker diaphragm using the injection molding method, it is preferable to set the thickness of the diaphragm to the desired thickness.In such cases, orientation is particularly likely to occur during the flow process, so The elastic modulus of the plate reaches r~20 x / 0' dyne/crd in the direction of flow. In addition, thermotropic liquid crystal polymer is also a type of ordinary plastic, so for example, polypropylene,
Internal loss equivalent to or greater than polyamide etc.
tan δ).
本発明において用いられるサーモトロビック液晶ポリマ
ーとしては、少なくとも下記構造を有するセグメントよ
りなるポリエステルあるいは、ポリエステルアミドの群
より任意に選択することができる。The thermotropic liquid crystal polymer used in the present invention can be arbitrarily selected from the group of polyesters or polyesteramides consisting of segments having at least the following structure.
ｌ） ポリエステル
−０−Ｒ−０−
−ＣＯ−Ｒ−ＣＯ−
−Ｏ−Ｒ−ＣＯ−
２） ポリエステルアミド
一〇−Ｒ−０−
−ＣＯ−Ｒ−ＣＯ−
一〇−Ｒ−ＣＯ−
−ＮＨ−Ｒ−ＮＨ−
−ＮＨ−Ｒ−ＣＯ−
上記構造式におけるＲは、それぞれ下記の群より任意に
選択することができる。l) Polyester-0-R-0- -CO-R-CO- -O-R-CO- 2) Polyester amide 10-R-0- -CO-R-CO- 10-R-CO- - NH-R-NH- -NH-R-CO- Each R in the above structural formula can be arbitrarily selected from the following group.
−ＣＨ２−（ＣＨＪ＊ −−（ＣＨ２）６−Ｈｓ
又、これらの芳香環基、脂環基あるいは脂肪族残基の水
素は、各種の置換基によって置換されていてもよい。-CH2-(CHJ*--(CH2)6-Hs Furthermore, the hydrogen atoms of these aromatic ring groups, alicyclic groups, or aliphatic residues may be substituted with various substituents.
好ましい置換基としては、ＣＩ、Ｂｒの様なハロゲン原
子、−ＣＨｌｌ、−〇（ＣＨ３）８ の様な炭素数／
−ｊの直鎖状または分岐状のアルキル基、の様な芳香族
基あるいはリン含有基が挙げられれる。Preferred substituents include CI, a halogen atom such as Br, -CHll, and a carbon number/substituent such as -〇(CH3)8.
-j is an aromatic group such as a linear or branched alkyl group, or a phosphorus-containing group.
本発明によるスピーカー用振動板は、上記サーモトロビ
ック液晶ポリマーを少なくとも１０重量％以上含有する
組成物より得られる。１０重量％未満では液晶ポリマー
の配向が不十分であり、弾性率の向上効果が思わしくな
い。The speaker diaphragm according to the present invention is obtained from a composition containing at least 10% by weight of the thermotropic liquid crystal polymer. If it is less than 10% by weight, the orientation of the liquid crystal polymer will be insufficient and the effect of improving the elastic modulus will be unsatisfactory.
又、本発明は、かかるサーモトロビック液晶ポリマーと
他の熱可塑性樹脂をブレンドすることによっても達成す
ることができる。熱可塑性樹脂としては、ポリエステル
、ポリカーボネート、ポリアミド、ポリエステルアミド
、ポリサルフォン、ボリアリレート、ポリイミド、ポリ
アミドイミド、ポリケトン類、ポリオレフィン、ポリス
チレン、ポリパラフェニレンスルフィド、塩化ビニル樹
脂等より、任意に選択することができる。The present invention can also be achieved by blending such thermotropic liquid crystal polymers with other thermoplastic resins. The thermoplastic resin can be arbitrarily selected from polyester, polycarbonate, polyamide, polyesteramide, polysulfone, polyarylate, polyimide, polyamideimide, polyketones, polyolefin, polystyrene, polyparaphenylene sulfide, vinyl chloride resin, etc. .
通常板状充填剤とは、いわゆる雲母のごとき偏平な形状
をした充填剤であり、その偏平率は。Usually, a plate-shaped filler is a filler with a flat shape like so-called mica, and its flattening ratio is .
短径／厚さで定義される。本発明において、サーモドロ
ピンク液晶ポリマーと共に使用される板状充填剤として
は、その偏平率が１０以上のものが好ましい。偏平率が
／θより小さいと弾性率の向上効果や流動性が大幅に低
下し、スピーカー用振動板の板厚を薄くすることができ
ず好ましくない。又、充填量が１重量％より少ないと異
方性が大きくなるためにスピーカー用振動板の打抜き工
程で割れ、ヒビ等が発生し好ましくない。３０重量％を
越えると材料の力学強度が低下するので、やはり打抜き
工程で割れが生じ、不適である。好ましい板状充填剤と
じてば、雲母、ガラスフレーク等より選択して使用する
ことができる。充填剤の径（短径）は、偏平率がｉｏ以
上であれば任意に使用することができる。雲母の場合白
雲母と金雲母の二種類があるが、金雲母の方が偏平率が
一般的に大きいので好ましく用いられる。Defined by short diameter/thickness. In the present invention, the plate-shaped filler used together with the thermodropink liquid crystal polymer preferably has an aspect ratio of 10 or more. If the oblateness is smaller than /θ, the effect of improving the elastic modulus and fluidity will be significantly reduced, making it impossible to reduce the thickness of the speaker diaphragm, which is not preferable. Further, if the filling amount is less than 1% by weight, the anisotropy becomes large, which is not preferable because cracks and cracks occur during the punching process of the speaker diaphragm. If it exceeds 30% by weight, the mechanical strength of the material will decrease, and cracks will occur during the punching process, making it unsuitable. Preferred plate-shaped fillers can be selected from mica, glass flakes, and the like. The diameter (breadth diameter) of the filler can be arbitrarily used as long as the aspect ratio is io or more. There are two types of mica: muscovite and phlogopite, but phlogopite is preferably used because it generally has a larger oblateness.
充填剤の平均粒径としては、スピーカー用振動板の表面
外観によっているいろ選択することができるが、平均粒
径が／θＱμを越えると成形品の外観が悪くなり好まし
くない。また、０３μ以下であると分散不良が生じ、や
はり外観不良の原因となるので好ましくない。The average particle size of the filler can be selected depending on the surface appearance of the speaker diaphragm, but if the average particle size exceeds /θQμ, the appearance of the molded product will deteriorate, which is undesirable. Further, if it is less than 0.03 μm, poor dispersion occurs, which is also a cause of poor appearance, which is not preferable.
本発明においてはまた、上記板状充填剤に加え更に繊維
状充填剤が添加されていても良い。In the present invention, a fibrous filler may also be added in addition to the above-mentioned plate-like filler.
以下本発明を実施例によってさらに具体的に説明するが
、本発明はこれらによって限定されるものではない。EXAMPLES The present invention will be explained in more detail below with reference to Examples, but the present invention is not limited thereto.
サーモトロビック液晶ポリマーとして三発化成■製の商
品名Ｎ０ＶＡＣＣＵＲＡＴＥ Ｅ−３２２（ＰＥＴ成分
とパラヒドロキシ安息香酸成分よりなる、サーモトロビ
ック液晶ポリマー）を用い、これに対して、東邦レーヨ
ン■製造の炭素繊維（商品名： ＨＴＡ（ｊＳ） を
２０重量％充填したものと、山ロマイカ■製造の金雲母
（商品名：Ａ、２／）を２０重重量光填したものについ
てそれぞれ第１図の形状のスピーカー振動板用金型で射
出成形を行なった。射出成形機は、住友重機■製ネスタ
ール（型締力ｉｓｏトン）を使用し、それぞれの樹脂組
成物に対して０．３ ｒｒａｎの厚みの振動板が得られ
るように射出速度、射出圧力、成形温度を変えて検討し
た。その結果、炭素繊維２０重量％を充填したものは、
成形品の厚みが０．３！ｔｒａｍのも゛のしか得られな
かった。As the thermotropic liquid crystal polymer, N0VACCURATE E-322 (product name: N0VACCURATE E-322 (thermotropic liquid crystal polymer consisting of PET component and para-hydroxybenzoic acid component) manufactured by Sanpika Kasei ■) was used, whereas carbon manufactured by Toho Rayon ■ was used. The fibers (product name: HTA (jS) filled with 20% by weight and the fibers filled with 20% by weight of phlogopite (product name: A, 2/) manufactured by Yamalo Mica ■ were filled with the shapes shown in Figure 1, respectively. Injection molding was performed using a mold for a speaker diaphragm.The injection molding machine used was Nestal (mold clamping force iso tons) manufactured by Sumitomo Heavy Industries, and a vibration of a thickness of 0.3 rran was applied to each resin composition. The injection speed, injection pressure, and molding temperature were varied to obtain a plate.As a result, the plate filled with 20% by weight of carbon fiber was
The thickness of the molded product is 0.3! I could only get the tram.
方マイカを充填したもの、厚みが０．３０ｒｒａｎの成
形品を得ることが出来た。この事は、板状の充填剤を用
いた場合には繊維状充填剤を用いた場合に比較して樹脂
の流動性の低下が少なく、従って極めて薄い板厚を有す
るスピーカー用振動板に適していることを示している。A molded product filled with mica and having a thickness of 0.30 rran was obtained. This means that when a plate-shaped filler is used, the fluidity of the resin decreases less than when a fibrous filler is used, and therefore it is suitable for speaker diaphragms with extremely thin plate thickness. It shows that there is.
又、充填剤を含まないナチュラル樹脂についても成形し
たが、充分満足のできる厚みの成形品を得ることが出来
た。Furthermore, we also molded a natural resin containing no filler, and were able to obtain a molded product with a sufficiently satisfactory thickness.
〔実施例２〕
実施例／で得られた成形品を第２図の形状にすべく金型
で打抜きを行なった。打抜き時の割れ、ヒビの発生確率
は、以下のようであった。[Example 2] The molded product obtained in Example 2 was punched out using a die to give it the shape shown in FIG. The probability of occurrence of cracks and cracks during punching was as follows.
ナチュラル樹脂 ３０％金雲母２０重量
係含有樹脂 Ｑ％炭素繊維２０重量係含有樹脂
０％〔実施例３〕
実施例２で打抜いた振動板について、実際にスピーカー
を組み立て音質テストを行なった。Natural resin 30% resin containing phlogopite 20% by weight Q% resin containing 20% carbon fiber by weight
0% [Example 3] A speaker was actually assembled using the diaphragm punched in Example 2, and a sound quality test was conducted.
又振動板より円周方向およびそれに対して直角方向のサ
ンプルを切り出し動的弾性率及びｔａｎδ の測定を行
なった。In addition, samples were cut out from the diaphragm in the circumferential direction and in the direction perpendicular to the circumferential direction, and the dynamic elastic modulus and tan δ were measured.
／） 音質テスト
ナチュラル樹脂 非常によい
金雲母２０重量係含有樹脂 非常によい炭素繊維２０重
量係含有樹脂 非常によい２） 動的弾性率及びｔａｎ
δ
オリエンチック社製レオバイプロン
ＤＤＶ−２ＥＡ型を使用してｌ１０Ｈｚの周波数で室温
にて動的弾性率及びｔａｎδ を評価した。/) Sound quality test Natural resin Very good phlogopite 20 weight modulus containing resin Very good carbon fiber 20 weight modulus containing resin Very good 2) Dynamic elastic modulus and tan
δ The dynamic elastic modulus and tan δ were evaluated at room temperature at a frequency of 110 Hz using a RheoVipron DDV-2EA model manufactured by Orientic.
いずれの測定サンプルについても、音質は極めて良好で
ある事が認められ、又！動的弾性率、ｔａ口δも良好な
値であった。The sound quality of all measurement samples was found to be extremely good. The dynamic elastic modulus and ta mouth δ also had good values.
〔比較例１〕
三菱化成■製のポリプロピレン樹脂（商品名： Ｎ０Ｖ
ＡＴＥＣ−Ｐ％ＭＩ（メルトインデックス）＝♂’＋７
’／ｍ１ｒ１）に、実施例／に使用したものと同じ炭素
線維を２０重重量光填した材料を用いて、実施例／と同
一条件でスピーカー用振動板を成形した。その結果０．
２ｒ圏の厚みの成形品を得ることができた。[Comparative Example 1] Polypropylene resin manufactured by Mitsubishi Kasei (product name: N0V)
ATEC-P%MI (melt index)=♂'+7
A diaphragm for a speaker was molded under the same conditions as in Example/, using a material in which the same carbon fiber as that used in Example/ was filled with 20% of the same carbon fiber as that used in Example/. The result is 0.
It was possible to obtain a molded product with a thickness in the 2r range.
得られた成形品を打抜き、音質テスト、動的弾性率等を
評価した。The obtained molded product was punched out and evaluated for sound quality, dynamic elastic modulus, etc.
音質テスト 良好であるが、サーモトロビック液晶ポリ
マー使用のスピーカ
ー用振動板に比較して、中高音
域の音質は劣っていた。Sound quality test: Good, but the sound quality in the mid-high range was inferior compared to speaker diaphragms using thermotropic liquid crystal polymer.
動的弾性率等
円周方向 乙ｘ／（７’ ｄｙｎ／ｃ！直角方向
μ、夕ｘｔｏ’ ｄｙｎ／Ｃｒ１ｔａｎδ ０
．Ｏｊｔ♂
動的弾性率等の測定値も液晶ポリマー使用の振動板より
劣った結果であった。Dynamic elastic modulus is the same in the circumferential direction x/(7' dyn/c!Right angle direction μ, xto' dyn/Cr1tanδ 0
．． Ojt♂ Measured values such as dynamic elastic modulus were also inferior to diaphragms using liquid crystal polymer.
本発明によれば、板状充填剤を用いることにより樹脂の
流動性の低下を少なくすることができるため、板厚の薄
いスピーカー用振動板が得られる。また、この振動板は
、成形時における割れやヒビも少なく、弾性率や強度に
おいても優れ、かつ音質の良好なものである。According to the present invention, a decrease in fluidity of the resin can be reduced by using a plate-shaped filler, so that a thin speaker diaphragm can be obtained. Furthermore, this diaphragm has few cracks or cracks during molding, has excellent elastic modulus and strength, and has good sound quality.
第１図は、本発明の実施例１で用いたスピーカー用振動
板用金型の形状を示す図である。
第２図は、本発明の実施例／で得られた成形品を金型で
打抜いた後のスピーカー用振動板の形状を示す図である
。FIG. 1 is a diagram showing the shape of a mold for a speaker diaphragm used in Example 1 of the present invention. FIG. 2 is a diagram showing the shape of a speaker diaphragm after punching the molded product obtained in the example of the present invention with a mold.
Claims (5)
、かつ板状充填剤を１重量％以上含む樹脂組成物を射出
成形することにより形成されるスピーカー用振動板。(1) A diaphragm for a speaker formed by injection molding a resin composition containing 10% by weight or more of a thermotropic liquid crystal polymer and 1% by weight or more of a plate-shaped filler.
を特徴とする、特許請求の範囲第１項記載のスピーカー
用振動板。(2) The diaphragm for a speaker according to claim 1, wherein the plate-shaped filler has an average particle size of 100 μm or less.
とする、特許請求の範囲第１項記載のスピーカー用振動
板。(3) The diaphragm for a speaker according to claim 1, wherein the plate-like filler has an oblateness of 10 or more.
る、特許請求範囲第１項記載のスピーカー用振動板。(4) The diaphragm for a speaker according to claim 1, wherein the plate-like filler is selected from phlogopite.
％以下であることを特徴とする特許請求の範囲第１項記
載のスピーカー用振動板。(5) The diaphragm for a speaker according to claim 1, wherein the content of the plate-like filler is 30% by weight or less based on the resin composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19864388A JPH0247999A (en) | 1988-08-09 | 1988-08-09 | Diaphragm for speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19864388A JPH0247999A (en) | 1988-08-09 | 1988-08-09 | Diaphragm for speaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0247999A true JPH0247999A (en) | 1990-02-16 |
Family
ID=16394626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19864388A Pending JPH0247999A (en) | 1988-08-09 | 1988-08-09 | Diaphragm for speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0247999A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008131436A (en) * | 2006-11-22 | 2008-06-05 | Asahi Kasei Fibers Corp | Edge for speaker unit |
| WO2010095704A1 (en) * | 2009-02-23 | 2010-08-26 | 三菱電機株式会社 | Speaker diaphragm, speaker, and speaker diaphragm manufacturing method |
-
1988
- 1988-08-09 JP JP19864388A patent/JPH0247999A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008131436A (en) * | 2006-11-22 | 2008-06-05 | Asahi Kasei Fibers Corp | Edge for speaker unit |
| WO2010095704A1 (en) * | 2009-02-23 | 2010-08-26 | 三菱電機株式会社 | Speaker diaphragm, speaker, and speaker diaphragm manufacturing method |
| CN102326415A (en) * | 2009-02-23 | 2012-01-18 | 三菱电机株式会社 | Speaker diaphragm, speaker, and speaker diaphragm manufacturing method |
| JP5214016B2 (en) * | 2009-02-23 | 2013-06-19 | 三菱電機株式会社 | Speaker diaphragm and speaker |
| US9027699B2 (en) | 2009-02-23 | 2015-05-12 | Mitsubishi Electric Corporation | Speaker diaphragm, speaker, and production method of speaker diaphragm |
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