JPH0484600A - Manufacture of acoustic diaphragm - Google Patents
Manufacture of acoustic diaphragmInfo
- Publication number
- JPH0484600A JPH0484600A JP19940790A JP19940790A JPH0484600A JP H0484600 A JPH0484600 A JP H0484600A JP 19940790 A JP19940790 A JP 19940790A JP 19940790 A JP19940790 A JP 19940790A JP H0484600 A JPH0484600 A JP H0484600A
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- graphite
- acoustic
- acoustic diaphragm
- film
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 23
- 239000010439 graphite Substances 0.000 claims abstract description 23
- 229920006254 polymer film Polymers 0.000 claims abstract description 12
- 229920001721 polyimide Polymers 0.000 claims abstract description 10
- 239000004642 Polyimide Substances 0.000 claims abstract description 9
- 125000003118 aryl group Chemical group 0.000 claims abstract description 9
- 239000004760 aramid Substances 0.000 claims abstract description 8
- 229920003235 aromatic polyamide Polymers 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 35
- 238000000465 moulding Methods 0.000 claims description 17
- -1 polyoxadiazole Polymers 0.000 claims description 7
- 239000000463 material Substances 0.000 abstract description 9
- 229910021385 hard carbon Inorganic materials 0.000 abstract description 2
- 238000000748 compression moulding Methods 0.000 abstract 4
- 238000010438 heat treatment Methods 0.000 description 11
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000001307 helium Substances 0.000 description 6
- 229910052734 helium Inorganic materials 0.000 description 6
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 239000012300 argon atmosphere Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000010000 carbonizing Methods 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005087 graphitization Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 239000002952 polymeric resin Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010303 mechanochemical reaction Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920003223 poly(pyromellitimide-1,4-diphenyl ether) Polymers 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 230000037303 wrinkles Effects 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
この発明は、スピーカー、マイクロフォン等の音響機器
等に使用される音響振動板の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method of manufacturing an acoustic diaphragm used in audio equipment such as speakers and microphones.
従来の技術
近年、音響機器のディジタル化が進行し、スピーカー等
の振動板に対する要求性能はまずまず厳しくなっている
。たとえば、外力による変形が少なく音の歪みが小さい
こと、再生音域が広く明瞭な音質が出せることが求めら
れており、そのためには軽く、しかも弾性率、剛性に優
れていることが要求されている。この事を具体的な物性
値の条件としてまとめると、
■ヤング率（Ｅ）が大きいこと、
■密度（ρ）が小さいこと、
■音速（音波の伝搬速度■）が大きいこと、■振動の内
部損失（ｔａｎδ）が適当であること、■強度が大きい
こと、
■任意の形状に成形が可能であること、などである。た
だし、Ｖ、Ｅ、 ρの間には、Ｖ−（Ｅ／ρ）１″
の関係がある。もちろん、これらの条件以外に、製造が
容易であること、熱や湿度などの外部条件に対して安定
であることが要求されていることは言うまでもない。BACKGROUND OF THE INVENTION In recent years, the digitalization of audio equipment has progressed, and the performance requirements for diaphragms such as speakers have become fairly strict. For example, it is required that there is little deformation due to external force and that the distortion of the sound is small, and that the reproduced sound range is wide and clear sound quality can be produced.To achieve this, it is required that it is light and has excellent elastic modulus and rigidity. . To summarize this as conditions for specific physical property values, ■Young's modulus (E) is large, ■Density (ρ) is small, ■Sound velocity (sound wave propagation speed■) is large, and ■Internal vibration. The loss (tan δ) should be appropriate, (1) it should have high strength, and (2) it should be moldable into any shape. However, the relationship between V, E, and ρ is V-(E/ρ)1''.Of course, in addition to these conditions, there are also considerations such as ease of manufacturing and resistance to external conditions such as heat and humidity. Needless to say, it is required to be stable and stable.
振動板材料としては、従来、紙、プラスチック、アルミ
ニウム、チタン、ヘリリウム、ポロン、シリカ等がその
素材として用いられてきた。これらは、単独であるいは
ガラス繊維や炭素繊維などとの複合体として使用された
り、金属合金などと言った形で使用されたりしてきた。Conventionally, materials such as paper, plastic, aluminum, titanium, helium, poron, and silica have been used as materials for the diaphragm. These materials have been used alone or in composites with glass fibers, carbon fibers, etc., or in the form of metal alloys.
しかしながら、紙やプラスチックは、ヤング率や密度、
音速などの特性が振動板として十分ではなく、特に高周
波数帯域での周波数特性が著しく劣るものであって、ツ
イータ、スコーカ−等の振動板としては明瞭な音質を得
ることが困難であった。また、アルミニウム、マグネシ
ウム、チタンなどは、音速はかなり優れているものの、
振動の内部損失が小さいため、高周波共振現象を生し、
これもまた高周波振動板としては不十分な特性しか得ら
れていなかった。一方、ポロン、ヘリリウム等は、上記
の素材に比べ優れた物性値を有しているために、振動板
として良質の音質を発現する事が出来る。しかしながら
、ポロンやヘリリウムは、極めて高価で、しかも著しく
加工性が劣っていると言う欠点を有している。However, paper and plastics have low Young's modulus and density.
Characteristics such as sound velocity are not sufficient as a diaphragm, and the frequency characteristics in particular in high frequency bands are extremely poor, making it difficult to obtain clear sound quality as a diaphragm for tweeters, squawkers, etc. In addition, although aluminum, magnesium, titanium, etc. have quite high sound speeds,
Because the internal loss of vibration is small, high frequency resonance occurs,
This also provided insufficient characteristics as a high frequency diaphragm. On the other hand, poron, helium, and the like have superior physical properties compared to the above-mentioned materials, so they can produce good sound quality as a diaphragm. However, poron and helium have the drawbacks of being extremely expensive and having extremely poor workability.
以上のような従来の振動板材料の持つ欠点を克服し優れ
た高周波特性を有しかつ良質の音色の再現を目指して、
炭素材料を用いた振動板の開発が行われている。これは
、炭素（グラファイト）の持つ優れた物性値を活かして
、これを振動板として使用するものである。この様な振
動板材料を得る方法には、つぎのようなものがある。We aim to overcome the drawbacks of conventional diaphragm materials as mentioned above, have excellent high frequency characteristics, and reproduce high quality tone.
Diaphragms using carbon materials are being developed. This takes advantage of the excellent physical properties of carbon (graphite) and uses it as a diaphragm. Methods for obtaining such a diaphragm material include the following.
（］）黒鉛粉末と高分子樹脂を複合一体化する方法。(]) A method of compositely integrating graphite powder and polymer resin.
（２）黒鉛粉末と高分子樹脂を複合一体化したのち焼結
して黒鉛／炭素複合型とする方法。(2) A method in which graphite powder and polymer resin are integrated into a composite and then sintered to form a graphite/carbon composite type.
（３）高分子を熱処理により炭素化する方法。(3) A method of carbonizing a polymer by heat treatment.
これらのうち、（＋）の方法により得られる代表的なも
のとして、塩化ビニル樹脂をマトリックスとしてこれに
黒鉛粉末を複合させた振動板がある。Among these, a typical example obtained by the (+) method is a diaphragm in which a vinyl chloride resin matrix is composited with graphite powder.
これは優れた性質を有する振動板よして知られている。This is known as a diaphragm with excellent properties.
（２）の方法としては、原油分解ピッチの液晶成分に黒
鉛粉末を混合させて熱処理炭化する方法や、黒鉛粉末に
これを結合するバインダーを加えて熱処理炭化する方法
がある。後者の場合、バインダーを炭化する際には、熱
硬化性樹脂のモノマーまたは初期重合物を、加熱時に分
解し相互に反応して架橋硬化する官能基を有する熱可塑
性樹脂と併せて熱処理炭化する方法等が知られている。Method (2) includes a method in which graphite powder is mixed with the liquid crystal component of crude oil cracking pitch and heat treated and carbonized, and a method in which a binder is added to the graphite powder to bind it and heat treated and carbonized. In the latter case, when carbonizing the binder, a thermosetting resin monomer or initial polymer is heat-treated and carbonized together with a thermoplastic resin that has functional groups that decompose when heated and react with each other to crosslink and harden. etc. are known.
これらの方法は、有機材料としての炭素収率を高め、熱
処理時における収縮、変形を防止することを目的として
開発されたもので、優れた特性の振動板を得ることが出
来る。These methods were developed with the aim of increasing the yield of carbon as an organic material and preventing shrinkage and deformation during heat treatment, and it is possible to obtain a diaphragm with excellent characteristics.
しかし、（１）の方法による振動板は、湿度、温度特性
に劣り、３０°Ｃ以上ではその振動特性は著しく劣化し
てしまう。However, the diaphragm produced by method (1) has poor humidity and temperature characteristics, and its vibration characteristics deteriorate significantly at temperatures above 30°C.
（２）の方法は、いずれも複雑な製造工程を必要とし、
工業的には量産を行う場合に著しく不利なものであった
。即ち、例えば、製造工程面では、原料として用いる原
油分解ピッチ及びその液晶成分を工業的に得るためには
高温熱処理や溶剤分別抽出等の極めて複雑な工程が必要
である点で問題があり、量産面では、黒鉛粉末とバイン
ダー樹脂を高度の剪断力を有する混練機を用いて十分に
混練し、メカノケミカル反応により襞間された黒鉛結晶
とバインダー樹脂を相互に強固に親和分散させ黒鉛の結
晶面をシーＩ・の面方向に配向させると言う高度な技術
が必要である点で問題があった。しかも、これらの方法
によって得られた振動板は、従来にない極めて優れた特
性を有しているとは言うものの、その特性は現在最高特
性であると言われるヘリリウムより僅かに劣り、黒鉛単
結晶の理論弾性率１０２０ＧＰａには遥かに及ばないも
のであった。Method (2) all require complicated manufacturing processes;
Industrially, this was extremely disadvantageous in mass production. For example, in terms of the manufacturing process, there is a problem in that extremely complicated processes such as high-temperature heat treatment and solvent fractional extraction are required to industrially obtain crude oil cracked pitch and its liquid crystal component used as raw materials, and mass production is difficult. For the surface, graphite powder and binder resin are sufficiently kneaded using a kneading machine with a high shear force, and a mechanochemical reaction causes the folded graphite crystals and binder resin to have a strong affinity and disperse with each other, thereby creating a graphite crystal surface. There was a problem in that a sophisticated technique was required to orient the C.I. Moreover, although it is said that the diaphragms obtained by these methods have extremely superior characteristics that have not been seen before, their characteristics are slightly inferior to that of helium, which is currently said to have the best characteristics, and they are slightly inferior to those of helium, which is said to have the best characteristics at present, and they are inferior to those of helium, which is said to have the best characteristics at present. It was far below the theoretical elastic modulus of 1020 GPa.
（３）の方法では、従来のプラスチックフィルムはいず
れも難黒鉛化材料であるため、当初予想したほどの特性
は得られなかった。しかも、用いられたプラスチック材
の炭素収率が低く、熱処理時の寸法収縮が大きく、変形
、ひび割れなどがしばしば生してしまうと言う欠点があ
った。すなわち、この方法では、任意の形状に成形した
り、十分な品質管理に耐え、しかも優れた特性を有する
振動板を得ることは困難であった。In method (3), since all conventional plastic films are non-graphitizable materials, properties as initially expected could not be obtained. Moreover, the carbon yield of the plastic material used is low, the dimensional shrinkage during heat treatment is large, and deformation and cracking often occur. That is, with this method, it is difficult to form a diaphragm into an arbitrary shape, withstand sufficient quality control, and to obtain a diaphragm with excellent characteristics.
発明が解決しようとする課題
そこで、発明者らは、（３）の方法での欠点を解決する
ために、特定の高分子を不活性ガス中で熱処理すること
によりグラファイトを得て、これを振動板として用いる
ことを提案した。Problems to be Solved by the Invention Therefore, in order to solve the drawbacks of method (3), the inventors obtained graphite by heat-treating a specific polymer in an inert gas, and then vibrated it. I proposed using it as a board.
しかし、この方法により得られるグラファイトは、厚さ
が薄いこと、さらに熱処理時の寸法収縮がまだまだ大き
く、変形、ひび割れなども生じてしまうこと、そのため
に任意の形状に成形する事が不可能であること等の問題
を有していた。その結果、この方法では、平板状の振動
板しか作製出来ず、強度的にも単体では音響振動板とし
て用いることが出来ないと言う欠点を有していた。However, the graphite obtained by this method is thin, and furthermore, the dimensional shrinkage during heat treatment is still large, causing deformation and cracking, making it impossible to mold it into arbitrary shapes. There were problems such as: As a result, this method has the disadvantage that only a flat diaphragm can be produced, and in terms of strength, it cannot be used alone as an acoustic diaphragm.
このような事情に鑑み、この発明は、発明者らが開発し
たグラファイト振動板の持つ欠点を解消し、非常に簡単
な方法で任意の形状に加工出来て、しかも従来のどの様
な振動板よりも優れた特性を有するグラファイト製の振
動板を提供することを目的とする。In view of these circumstances, this invention eliminates the drawbacks of the graphite diaphragm developed by the inventors, allows it to be processed into any shape with a very simple method, and is more durable than any conventional diaphragm. Another object of the present invention is to provide a graphite diaphragm having excellent characteristics.
課題を解決するための手段
前記目的を達成するため、請求項１〜３記載の発明にか
かる音響振動板の製造方法では、芳香族ポリイミド、ポ
リオキサジアゾール、芳香族ポリアミドのうちの少なく
とも一つからなる高分子フィルムを熱処理しグラファイ
ト化する際、２０００℃以上の温度域で加圧成型を行う
ようにしている。Means for Solving the Problems In order to achieve the object, the method for manufacturing an acoustic diaphragm according to the invention according to claims 1 to 3 uses at least one of aromatic polyimide, polyoxadiazole, and aromatic polyamide. When heat-treating a polymer film made of the above to graphitize it, pressure molding is carried out in a temperature range of 2000° C. or higher.
また請求項４記載の発明にかかる音響振動板の製造方法
では、芳香族ポリイミド、ポリオキサジアゾール、芳香
族ポリアミドのうちの少なくとも一つからなる高分子フ
ィルムを熱処理して得たグラファイトフィルムを、２０
００°Ｃ以」二の温度域で加圧成型を行うようにしてい
る。Further, in the method for manufacturing an acoustic diaphragm according to the invention described in claim 4, a graphite film obtained by heat treating a polymer film made of at least one of aromatic polyimide, polyoxadiazole, and aromatic polyamide, 20
Pressure molding is performed in a temperature range of 00°C or higher.
成型工程で付けられる形状は、請求項２のように、ドー
ム状（真球曲面に限らず楕円曲面もある）、あるいは、
コーン状とすることが好ましい。The shape formed in the molding process is, as claimed in claim 2, a dome shape (not only a true spherical curved surface but also an elliptical curved surface), or
It is preferable to have a cone shape.
また、請求項３のように、高分子フィルムに張力をかけ
ながら加圧成型することが好ましい。Moreover, as in claim 3, it is preferable to perform pressure molding while applying tension to the polymer film.
この発明で使われる芳香族ポリイミド、ポリオキサジア
ゾール、芳香族ポリアミドには下記のような化合物が例
示される。Examples of the aromatic polyimide, polyoxadiazole, and aromatic polyamide used in this invention include the following compounds.
芳香族ポリイミド
ここでＲ，は、
Ｒ２は、
この発明では高分子フィルムを熱処理してグラファイト
化するのであるが、熱処理の際、２０００°Ｃ以上の温
度域に達するようにする。２０００°Ｃ未満だと適切な
グラファイト化が困難だからである。Aromatic polyimide Herein, R, and R2 are In the present invention, the polymer film is heat-treated to graphitize it, and during the heat treatment, the temperature is set to reach a temperature range of 2000° C. or more. This is because if the temperature is less than 2000°C, it is difficult to form graphitization appropriately.
加圧成型は２０００°Ｃ以上の温度域で行う。２０００
°Ｃ未満ではフィルムは未だ実質的にハードカーボンの
状態にあり、加圧成型によって破損してしまう。Pressure molding is performed at a temperature range of 2000°C or higher. 2000
Below °C, the film is still essentially in a hard carbon state and will be damaged by pressure molding.
２０００°Ｃ以上の温度域ではグラファイト化に伴い柔
軟性が出てきて、加圧成型できるようになる。逆に言う
と、２０００°Ｃ未満の温度域では実質的に圧力を印加
しないようにすることが望ましい。ここで、実質的に圧
力を印加しない状態とは、たとえば、成型のための治具
の自重だけによる程度の圧力がかかった状態を指してい
る。In the temperature range of 2000°C or higher, it becomes graphitized and becomes flexible, allowing pressure molding. Conversely, it is desirable not to substantially apply pressure in a temperature range below 2000°C. Here, the state in which no pressure is substantially applied refers to, for example, a state in which pressure is applied only by the weight of the molding jig.
加圧成型のための圧力は、フィルム厚みにもより、厚い
ものほど高圧力が必要である。具体的には１枚のフィル
ム当たりの圧力の大きさは、２５７１ｍ以下の厚みの場
合で０．２ｋｇ／ｃｉ以上、２５μｍを越える厚みの場
合で１．０ｋｇ／ｃｒ１以上程度は普通必要である。こ
れ以下の圧力だとドーム状やコーン状成形体に皺が入る
。The pressure for pressure molding depends on the film thickness, and the thicker the film, the higher the pressure required. Specifically, the amount of pressure per film is normally required to be 0.2 kg/ci or more when the thickness is 2571 m or less, and 1.0 kg/cr1 or more when the thickness exceeds 25 μm. If the pressure is lower than this, wrinkles will appear in the dome-shaped or cone-shaped molded product.
加圧成型の際、フィルムに張力をかけることが好ましい
。張力をかける方法には、熱処理中のフィルムを横方か
ら引っ張る方法、高分子フィルムを枠に固定し熱処理に
よりフィルム収縮により自然と張力がかかるようにする
方法が挙げられる。It is preferable to apply tension to the film during pressure molding. Examples of methods for applying tension include a method in which the film being heat-treated is pulled laterally, and a method in which the polymer film is fixed to a frame and tension is naturally applied due to shrinkage of the film during heat treatment.
作用
この発明の音響振動板の製造方法では、グラフアイｌ−
化の熱処理における２０００°Ｃ以上の温度域というフ
ィルムに柔軟性の出る段階で加圧成型を行うだめ、例え
ば、ドーム状、コーン状といった適切な形状の音響振動
板を得ることができる。また、高分子フィルムは、芳香
族ポリイミド、ポリオキサジアゾール、芳香族ポリアミ
ドというグラファイト化の容易な材料であるため、優れ
たグラファイト製振動板が得られる。Function: In the method for manufacturing an acoustic diaphragm of the present invention, graph eye l-
By performing pressure molding at a temperature range of 2000° C. or higher during chemical heat treatment, when the film becomes flexible, it is possible to obtain an acoustic diaphragm having an appropriate shape, such as a dome shape or a cone shape. In addition, since the polymer film is made of aromatic polyimide, polyoxadiazole, or aromatic polyamide, which is easily graphitized, an excellent graphite diaphragm can be obtained.
発明者らは、平面型グラファイト製振動板では中々十分
な性能を発揮できないため、様々な検討の結果、例えば
、ドーム状、コーン状といった適切な形状の音響振動板
が得られる方法を見出すことができたのである。The inventors found that a planar graphite diaphragm cannot exhibit sufficient performance, so after various studies, they were able to find a method for obtaining an acoustic diaphragm with an appropriate shape, such as a dome shape or a cone shape. It was done.
また、高分子フィルムに張力をかけながら加圧成型する
と、グラファイト化がより促進され音響特性の優れたグ
ラファイト振動板が得られるようになる。Further, when the polymer film is pressure-molded while applying tension, graphitization is further promoted and a graphite diaphragm with excellent acoustic properties can be obtained.
得られた振動板は、スピーカー、マイクロフォン等に使
うことができる。The obtained diaphragm can be used for speakers, microphones, etc.
実施例
以下、この発明の詳細な説明する。もちろん、この発明
は、下記の実施例に限らない。EXAMPLES The present invention will be described in detail below. Of course, this invention is not limited to the following embodiments.
実施例１〜４
厚み２５μｍ（実施例１）、５０１１ｍ（実施例２）、
７５μｍ（実施例３）、１２５μｍ（実施例４）のポリ
イミドフィルム（東レーデュポン株式会社製 商品名
カプトン）それぞれを、直径：３０世、Ｒ２５胴のドー
ム状部を有するカーボン製成型治具で挟み、ホットプレ
ス炉（中外炉工業型ＧＩ５Ｘ］、５＋１Ｔ−ＢＣＰ −
ＨＰ１５）を用い、アルゴン雰囲気中、２０°Ｃ／分の
昇温速度で２８００°Ｃまで昇温し、その後１０ｋｇ／
ｃｆｆｌの圧力を印加し２時間保持し、ドーム状音響振
動板を得た。Examples 1 to 4 Thickness: 25 μm (Example 1), 5011 m (Example 2),
Polyimide films of 75 μm (Example 3) and 125 μm (Example 4) (trade name, manufactured by DuPont Toray Co., Ltd.)
Kapton) were sandwiched between carbon molding jigs having a dome-shaped part with a diameter of 30cm and an R25 body, and a hot press furnace (Chugairo Kogyo type GI5X), 5+1T-BCP -
HP15) in an argon atmosphere at a heating rate of 20°C/min to 2800°C, then 10kg/min.
A pressure of cffl was applied and maintained for 2 hours to obtain a dome-shaped acoustic diaphragm.
実施例５
厚み５０μｍのポリアミドフィルムを用いるようにした
他は実施例１と同様にして、ドーム状音響振動板を得た
。Example 5 A dome-shaped acoustic diaphragm was obtained in the same manner as in Example 1, except that a polyamide film with a thickness of 50 μm was used.
実施例６
厚み５０μｍのポリオキサジアゾールフィルムを用いる
ようにした他は実施例１と同様にして、ドーム状音響振
動板を得た。Example 6 A dome-shaped acoustic diaphragm was obtained in the same manner as in Example 1, except that a polyoxadiazole film with a thickness of 50 μm was used.
実施例７
厚み５０μｍのポリアミドフィルムを超高温炉（進成電
炉製作所製４５−６型）を用いてアルゴン雰囲気中で２
８００℃の熱処理を行いグラファイトフィルムを得、こ
のフィルムをさらに実施例１と同様の手法、条件により
ホットプレス炉で加圧成型を行い、ドーム状の音響振動
板を得た。Example 7 A polyamide film with a thickness of 50 μm was heated in an argon atmosphere using an ultra-high temperature furnace (Model 45-6 manufactured by Shinsei Denko Seisakusho).
A graphite film was obtained by heat treatment at 800°C, and this film was further pressure-molded in a hot press furnace using the same method and conditions as in Example 1 to obtain a dome-shaped acoustic diaphragm.
実施例８
厚み５０μｍのポリオキサジアゾールフィルムをグラフ
ァイト製の枠に固定し、ホットプレス炉（中外炉工業型
Ｇ１５Ｘ１５１１Ｔ−Ｂ−ＧＰ・１ＩＰ１５）を用い、
アルゴン雰囲気中、２０°Ｃ／分の昇温速度で２８００
°Ｃまで昇温し、その後、直径： ３０ｍｍ、 Ｒ２５
ｍｍのドーム状部を有するカーボン製成型治具で、１０
ｋｇ／Ｃｄの圧力を印加して２時間保持し、ドーム状音
響振動板を得た。Example 8 A polyoxadiazole film with a thickness of 50 μm was fixed to a graphite frame, and a hot press furnace (Chugairo Kogyo model G15X1511T-B-GP/1IP15) was used.
2800 at a heating rate of 20°C/min in an argon atmosphere
The temperature was raised to °C, then the diameter: 30 mm, R25
A carbon molding jig with a dome-shaped part of 10 mm
A pressure of kg/Cd was applied and maintained for 2 hours to obtain a dome-shaped acoustic diaphragm.
実施例１〜８の音響振動板について、東洋精器製ダイナ
ミックモジュラスクーを用いて物性値（音速、内部損失
）を測定した。さらに、ボイスコイルを取り付け、（再
生）限界周波数を測定した。測定結果を第１表に示す。The physical properties (velocity of sound, internal loss) of the acoustic diaphragms of Examples 1 to 8 were measured using a dynamic modulus scooter manufactured by Toyo Seiki. Furthermore, a voice coil was attached and the (reproduction) limit frequency was measured. The measurement results are shown in Table 1.
なお、実施例１〜４の音響振動板の一部を切り出し、走
査型電子顕微鏡（日本電子製 Ｔ −３００型）で断面
を観察したところ、グラファイト特有の層状構造が見ら
れた。Note that when a part of the acoustic diaphragm of Examples 1 to 4 was cut out and the cross section was observed with a scanning electron microscope (Model T-300 manufactured by JEOL Ltd.), a layered structure peculiar to graphite was observed.
（以下余白） 第 表 ファイト製振動板が得られる。(Margin below) No. table A phite diaphragm is obtained.
請求項２の音響振動板の製造方法では、加えて、得られ
る振動板の形状がコーン状あるいはドーム状であるため
、より音響特性の良いグラファイト製振動板が得られる
。In addition, in the method for manufacturing an acoustic diaphragm according to claim 2, since the shape of the obtained diaphragm is cone-like or dome-like, a graphite diaphragm with better acoustic characteristics can be obtained.
請求項３の音響振動板の製造方法では、加えて、グラフ
ァイト化が十分に進んだより音響特性の良いグラファイ
ト製振動板が得られる。In addition, in the method for manufacturing an acoustic diaphragm according to claim 3, it is possible to obtain a graphite diaphragm that is sufficiently graphitized and has better acoustic characteristics.
代理人の氏名 弁理士 粟野重孝 はか１名第１表にみ
るように、実施例１〜８の音響振動板は従来にない優れ
た音響特性を有するものとなっている。Name of Agent: Patent Attorney Shigetaka Awano (1 person) As shown in Table 1, the acoustic diaphragms of Examples 1 to 8 have excellent acoustic characteristics that have never existed before.
発明の効果Effect of the invention
Claims (4)
族ポリアミドのうちの少なくとも一つからなる高分子フ
ィルムを熱処理しグラファイト化する際、２０００℃以
上の温度域で加圧成型を行うようにする音響振動板の製
造方法。(1) When heat-treating a polymer film made of at least one of aromatic polyimide, polyoxadiazole, and aromatic polyamide to form graphite, an acoustic system that performs pressure molding in a temperature range of 2000°C or higher Method of manufacturing a diaphragm.
コーン状である請求項１記載の音響振動板の製造方法。(2) The shape formed during the molding process is dome-like, or
The method for manufacturing an acoustic diaphragm according to claim 1, wherein the acoustic diaphragm has a cone shape.
ようにする請求項１または２記載の音響振動板の製造方
法。(3) The method for manufacturing an acoustic diaphragm according to claim 1 or 2, wherein pressure molding is performed while applying tension to the polymer film.
族ポリアミドのうちの少なくとも一つからなる高分子フ
ィルムを熱処理して得たグラファイトフィルムを、２０
００℃以上の温度域で加圧成型を行うようにする音響振
動板の製造方法。(4) A graphite film obtained by heat treating a polymer film made of at least one of aromatic polyimide, polyoxadiazole, and aromatic polyamide,
A method for manufacturing an acoustic diaphragm in which pressure molding is performed in a temperature range of 00°C or higher.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2199407A JP2584114B2 (en) | 1990-07-27 | 1990-07-27 | Manufacturing method of acoustic diaphragm |
| US07/735,721 US5178804A (en) | 1990-07-27 | 1991-07-25 | Method of manufacturing acoustic diaphragm |
| EP91112609A EP0468524B1 (en) | 1990-07-27 | 1991-07-26 | Method of manufacturing acoustic diaphragm |
| DE69124024T DE69124024T2 (en) | 1990-07-27 | 1991-07-26 | Method of manufacturing an acoustic membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2199407A JP2584114B2 (en) | 1990-07-27 | 1990-07-27 | Manufacturing method of acoustic diaphragm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0484600A true JPH0484600A (en) | 1992-03-17 |
| JP2584114B2 JP2584114B2 (en) | 1997-02-19 |
Family
ID=16407285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2199407A Expired - Lifetime JP2584114B2 (en) | 1990-07-27 | 1990-07-27 | Manufacturing method of acoustic diaphragm |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2584114B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7351443B2 (en) | 2003-06-02 | 2008-04-01 | Matsushita Electric Industrial Co., Ltd. | Electron-emmiting material and manufacturing method therefor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6411498A (en) * | 1987-07-03 | 1989-01-17 | Japan Res Dev Corp | Production of diaphragm |
| JPS6411499A (en) * | 1987-07-03 | 1989-01-17 | Japan Res Dev Corp | Production of diaphragm |
| JPH01259698A (en) * | 1988-04-08 | 1989-10-17 | Res Dev Corp Of Japan | Diaphragm electric acoustic converter and manufacture of diaphragm |
-
1990
- 1990-07-27 JP JP2199407A patent/JP2584114B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6411498A (en) * | 1987-07-03 | 1989-01-17 | Japan Res Dev Corp | Production of diaphragm |
| JPS6411499A (en) * | 1987-07-03 | 1989-01-17 | Japan Res Dev Corp | Production of diaphragm |
| JPH01259698A (en) * | 1988-04-08 | 1989-10-17 | Res Dev Corp Of Japan | Diaphragm electric acoustic converter and manufacture of diaphragm |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7351443B2 (en) | 2003-06-02 | 2008-04-01 | Matsushita Electric Industrial Co., Ltd. | Electron-emmiting material and manufacturing method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2584114B2 (en) | 1997-02-19 |
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