JPS59189799A - Production of diaphragm of electroacoustic transducer - Google Patents

Production of diaphragm of electroacoustic transducer

Info

Publication number
JPS59189799A
JPS59189799A JP6405983A JP6405983A JPS59189799A JP S59189799 A JPS59189799 A JP S59189799A JP 6405983 A JP6405983 A JP 6405983A JP 6405983 A JP6405983 A JP 6405983A JP S59189799 A JPS59189799 A JP S59189799A
Authority
JP
Japan
Prior art keywords
nonwoven fabric
diaphragm
thermosetting resin
fiber
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
Application number
JP6405983A
Other languages
Japanese (ja)
Inventor
Akira Nakamura
仲村　昭
Hideo Nanjo
英夫 南條
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.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki Co Ltd
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 Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Priority to JP6405983A priority Critical patent/JPS59189799A/en
Publication of JPS59189799A publication Critical patent/JPS59189799A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

PURPOSE:To form easily a diaphragm having a complicated shape and adjust freely the weight and the thickness by forming temporarily a nonwoven cloth consisting of high-elasticity fiber with heat press and coating a thermosetting resin to this nonwoven cloth and hardening the resin with heat press to form it. CONSTITUTION:The high-elasticity fibers such as carbon fiber or the like (>=5.0X10<10>/m<3> Young's modulus E) is manufactured to sheets having the randomized orientation of the fibre. In case of the production for the cone diaphragm of a speaker, the circular nonwoven cloth pieces 1,2,3, and 4 are cutout from the nonwoven cloth. These nonwoven cloth pieces 1-4 are subjected to press molding by heating with a mold 5a and 5b to form temporarily. Next, the nonwoven cloth pieces 1 and 2 are laminated on a conical receiving base 6 so that the fiber is oriented vertically to each other approximately. An epoxy resin 7 to which a foaming agent is added is coated to one face of the cloth piece 2 uniformly while controlling its weight. Next, the cloth pieces 3 and 4 are laminated on the cloth piece 2 so that fiber is oriented vertically to each other. Cloth pieces 1-4 are subjected to press molding by heating with the mold 9a and 9b, and the resin 7 is allowed to penetrate the whole of nonwoven cloth pieces 1-4 and is hardened.

Description

【発明の詳細な説明】 この発明は、スピーカのコーン振動板のような電気音響
変換器における振動板の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a diaphragm in an electroacoustic transducer, such as a cone diaphragm for a speaker.

周知のように、スピーカのコーン等として用いられる発
音用の振動板は、入力されるエネルギ（、・の音への変
換能率が高く、適度な内部損失・−δを有し、畜産ρが
小さく、かつヤング率Ｅが高い等の緒特性が要求される
。そして、上記のような緒特性を満足するものとして、
炭素繊維等の高弾性繊維からなる不織布に、エポキシ系
樹脂等の熱硬化性樹脂を含浸させ、かつ硬化成形した振
動板が知られている。ところで、このような振動板は、
従来、概ね以下に述べるような工程で製造されていた。As is well known, a sounding diaphragm used as a speaker cone, etc. has a high efficiency of converting input energy into sound, has a moderate internal loss -δ, and has a small livestock ρ. , and high Young's modulus E.As a material that satisfies the above properties,
A diaphragm is known in which a nonwoven fabric made of highly elastic fibers such as carbon fibers is impregnated with a thermosetting resin such as an epoxy resin and then cured and molded. By the way, such a diaphragm is
Conventionally, they have been manufactured using the steps described below.

すなわち、まず高弾性繊維からなる不織布に熱硬化性樹
脂を含浸させ、かつ半硬化させてプリプレグ状態のシー
トを得る。次に、この平板状のシートを、所定の面形状
に裁断し、この裁断したものを加熱プレスして振動板の
形状（例えばコーン状）に硬化成形する。That is, first, a nonwoven fabric made of highly elastic fibers is impregnated with a thermosetting resin and semi-cured to obtain a prepreg sheet. Next, this flat sheet is cut into a predetermined surface shape, and the cut material is heated and pressed to harden and mold it into the shape of a diaphragm (for example, a cone shape).

しかしながら、上記のような工程による製造方法には、
次のような欠点があった。However, the manufacturing method using the above steps,
It had the following drawbacks.

■　プレプレグ状態のシートは、硬化の進行を防ぐため
に低温状態で保存しなければならず、また保存期間にも
制限がある。■ Prepreg sheets must be stored at low temperatures to prevent the progress of hardening, and there are limits to their storage period.

■　作製される振動板の重量および板厚は、前記シート
の板厚および単位面積当りの重量で決まってしまうため
、個々の振動板についてその重量および板厚を調整する
ことが極めて困難である。(2) Since the weight and thickness of the diaphragm to be produced are determined by the thickness of the sheet and the weight per unit area, it is extremely difficult to adjust the weight and thickness of each diaphragm.

θ　振動板がプリプレグ状態のシートから１回の加熱プ
レスによって成形されるため、深絞りのコーンのような
振動板あるいは複雑な形状の振動板を成形することが困
難である。すなわち、プリプレグ状態のシートにおいて
は、前記不織布の繊維が熱硬化性樹脂によっである程度
相互に結合された状態にあるため、不織布の伸びが前記
樹脂を含まない場合よりも低下することになる。このた
め、無理な成形を行なうと、繊維が切断あるいは分離し
てしまい強度が著るしく低下する虞れがある。Since the θ diaphragm is molded from a prepreg sheet by one heat press, it is difficult to mold a diaphragm like a deep-drawn cone or a diaphragm with a complicated shape. That is, in the prepreg sheet, the fibers of the nonwoven fabric are mutually bonded to some extent by the thermosetting resin, so the elongation of the nonwoven fabric is lower than when the resin is not included. For this reason, if the molding is performed forcibly, the fibers may be cut or separated, resulting in a significant decrease in strength.

この発明は、以上の事情に鑑みてなされたもので、その
目的とするところは、絞りの深い形状あるいは復雑な形
状の振動板であっても容易に成形することができ、重量
および板厚の調整を自由に行なうことができ、しかも工
程途中における半製品の保存、管理が容易となる電気音
響変換器における振動板の製造方法を提供することにあ
る。そして、この発明の特徴は、高弾性ａ維からなる不
織布を加熱プレスして予め振動板の形状に仮成形し、し
かる後、この仮成形された不織布に熱硬化性樹脂を塗布
し、更に加熱プレスして振動板に硬化成形したことにあ
る。そして、この場合、前記不織布としては繊維方向が
無秩序なものを用いるとよく、また繊維方向にある程度
方向性がある場合は、複数枚の不織布を繊維方向が互い
に異なるようにして積層するとよい。また、必要に応じ
て、前記熱硬化性樹脂中に発泡剤を添加し、成形時に発
泡させるようにしてもよい。This invention was made in view of the above circumstances, and its purpose is to be able to easily form a diaphragm even if it has a deep drawing shape or a complicated shape, and to reduce the weight and thickness of the diaphragm. It is an object of the present invention to provide a method for manufacturing a diaphragm in an electroacoustic transducer, which allows free adjustment of the diaphragm and facilitates storage and management of semi-finished products during the process. The feature of this invention is that a non-woven fabric made of highly elastic A-fiber is heated and pressed to temporarily form it into the shape of a diaphragm, and then a thermosetting resin is applied to this temporarily formed non-woven fabric, and then heated. The reason is that it is pressed and hardened into a diaphragm. In this case, it is preferable to use a nonwoven fabric with disordered fiber directions, and if the fiber direction has some degree of directionality, it is preferable to laminate a plurality of nonwoven fabrics with different fiber directions. Further, if necessary, a foaming agent may be added to the thermosetting resin to cause foaming during molding.

以下、この発明による振動板のＩｉ！造方法を図面を参
照しながら詳細に説明する。Below, Ii! of the diaphragm according to this invention! The manufacturing method will be explained in detail with reference to the drawings.

まず、この発明において用いられる不繊布について説明
する。この不織布としては、例えば炭素繊維等の高弾性
繊維（フィラメント繊維）を繊維方向が無秩序となるよ
うにして抄造し、かつ繊維のバインダとして熱可塑性樹
脂、たとえば、不飽和ポリエステルを用いたものが望ま
しい。この場合、前記高弾性繊維としては、上述した炭
素繊維が好適であるが、ようは、ヤング率Ｅ　ｔｒＥ　
５．ＯＸｌ　ｏｔ。First, the nonwoven fabric used in this invention will be explained. This nonwoven fabric is desirably made of highly elastic fibers (filament fibers) such as carbon fibers so that the fiber directions are disordered, and a thermoplastic resin such as unsaturated polyester is used as a binder for the fibers. . In this case, the above-mentioned carbon fiber is suitable as the high modulus fiber, but Young's modulus E trE
5. OXlot.

Ｎ／ｍ”以上あるような高弾性繊維であればよく、この
種の繊維としては例えばガラス繊維、シリコンカーバイ
ド繊維、ボ四ン繊維、グラファイト繊維、セラミック繊
維あるいは芳香族ポリアミド繊維等が挙げられる。また
、前述したように不織布の繊維方向が無秩序であると、
作製された振動板の強度がどの方向に対しても一様とな
るので、極めて好ましいが、不織布の繊維方向は必ずし
も無秩序である必要はなく、ある程度方向性を有してい
てもよい。ただし、この場合は振動板の強度を一様にす
るために、複数枚（通常２〜３枚）の不織布を互いの繊
維方向が異なるように（例えば直交するように）して積
層するとよい。また、この不織布の繊維は熱可塑性樹脂
のバインダによって結合されていると、加熱プレスして
仮成形した場合に、形状がより良好に保持されるので都
合がよいが、このバインダは必ずしも必要ではない。Any fiber with a high modulus of N/m" or more may be used, and examples of this type of fiber include glass fiber, silicon carbide fiber, boron fiber, graphite fiber, ceramic fiber, and aromatic polyamide fiber. In addition, as mentioned above, if the fiber direction of the nonwoven fabric is disordered,
This is extremely preferable because the strength of the produced diaphragm is uniform in all directions, but the fiber direction of the nonwoven fabric does not necessarily have to be random and may have some degree of directionality. However, in this case, in order to make the strength of the diaphragm uniform, it is preferable to laminate a plurality of nonwoven fabrics (usually 2 to 3 pieces) with their fiber directions different from each other (eg, perpendicular to each other). In addition, it is advantageous if the fibers of this nonwoven fabric are bound together by a thermoplastic resin binder, as this will help them retain their shape better when they are hot-pressed and preformed, but this binder is not always necessary. .

また、仮成形された不織布に塗布する熱硬化性樹脂とし
ては、エポキシ樹脂、不飽和ポリエステル樹脂、フェノ
ール樹脂、およびポリイミド樹脂等が挙げられる。これ
らの熱硬化性樹脂からどの樹脂を選択するかは任意であ
るが、不織布の高弾性繊維に最も適合性のよい樹脂を選
択することが望ましい。またこの種の熱硬化性樹脂は、
例えばエポキシ樹脂を例にした場合、主剤と硬化剤と？
調合して始めて硬化を開始するものが一般的であるから
、この熱硬化性樹脂の保存が極めて容易になる。さらに
、この熱硬化性樹脂を、仮成形された不織布に対してど
の程度の量塗布するかは、その都度決定すればよく、こ
れによって振動板の重量および板厚を調整することが可
能になる。Furthermore, examples of the thermosetting resin applied to the temporarily formed nonwoven fabric include epoxy resin, unsaturated polyester resin, phenol resin, and polyimide resin. Although any resin may be selected from these thermosetting resins, it is desirable to select a resin that is most compatible with the highly elastic fibers of the nonwoven fabric. In addition, this type of thermosetting resin is
For example, if we take epoxy resin as an example, what are the base resin and curing agent?
Since the thermosetting resin generally starts curing only after it has been prepared, it is extremely easy to store this thermosetting resin. Furthermore, the amount of this thermosetting resin to be applied to the temporarily formed nonwoven fabric can be determined on a case-by-case basis, making it possible to adjust the weight and thickness of the diaphragm. .

また、この熱硬化性樹脂に、必要に応じて、発泡剤、た
とえば、アゾジカルボンアミド、ジニトロリペンタメチ
レンテトラミン等を添加してもよい。これにより樹脂中
に独立発泡を形成して、見かけ上の密度ρを小に、かつ
、断面２次モーメン）ＩＮＦ大に構成し得る。Further, a blowing agent such as azodicarbonamide, dinitrolipentamethylenetetramine, etc. may be added to this thermosetting resin as necessary. As a result, independent foaming can be formed in the resin, and the apparent density ρ can be made small and the moment of inertia (second moment of area) INF can be made large.

次に、この発明を適用してスピーカのコーン振動板を製
造する場合の一実施例を、第１図ないし第５図を参照し
て説明する。Next, an embodiment of manufacturing a cone diaphragm for a speaker by applying the present invention will be described with reference to FIGS. 1 to 5.

この実施例において用いられた不織布は、商品名「トレ
カ」と呼ばれるカーボンマットであり、これは炭素繊維
からなり、かつバインダとしてボＶエステル系熱加塑性
樹脂が用いられたもので、その単位面積あたりの重量は
約３０９／ｍ’、厚さはｒＪ、Ｚ、であり、また、その
繊維長は１２ｍｍとなっている。そして、これら繊維配
向けほぼ等方とされているが、実際にはある程度方向性
が存在する。The nonwoven fabric used in this example is a carbon mat called "Torayka" (trade name), which is made of carbon fiber and uses BoV ester thermoplastic resin as a binder, and its unit area The weight per unit is approximately 309/m', the thickness is rJ,Z, and the fiber length is 12 mm. Although these fibers are said to be approximately isotropic in orientation, in reality there is some degree of directionality.

まず、上記不織布から、第１図に示すように、所定径を
有する平面視円形の４枚の不織布片１．２．３．４を裁
断（あるいは打ち抜き）して得る。First, as shown in FIG. 1, four nonwoven fabric pieces 1.2.3.4 each having a predetermined diameter and having a circular shape in plan view are obtained by cutting (or punching) the nonwoven fabric.

この場合、不織布片１．２．４は等径であり、また不織
布片３は、ネック補強用のものであるから他のものより
小径となっている。次に、これら不織布片１〜４を、第
２図に示すように、コーン仮成形用の金型５１Ｌ　％　
５　ｂによって加熱プレスｔで、最終的なコーン形状に
略等しい形状に仮成形する。In this case, the nonwoven fabric pieces 1, 2, and 4 have the same diameter, and the nonwoven fabric piece 3 has a smaller diameter than the other pieces because it is used for neck reinforcement. Next, as shown in FIG.
5. Temporarily formed into a shape approximately equal to the final cone shape using a heated press t.

この仮成形時における加熱プレスは、例えば１５０°Ｃ
前後の温度で５〜１０秒間程度行なわれ、これによって
前記バインダの塑性変形がなされて名手織布片１〜４が
コーン状に仮成形される。なお、第２図は、不織布片１
を仮成形する場合を例にして示しである。The heating press during this temporary forming is, for example, 150°C.
This is carried out for about 5 to 10 seconds at different temperatures, whereby the binder is plastically deformed and the master woven fabric pieces 1 to 4 are temporarily formed into cone shapes. In addition, FIG. 2 shows the nonwoven fabric piece 1
The following is an example of a case in which temporary molding is performed.

次に、第３図に示すように、円錐状の受は台６の上に前
記不織布片１を載置し、この不繊布片１の上に、前記不
織布片２を同不織布片１と繊維方向が略直行するように
して積層する。次いで、この不織布片２の上面に、調合
され、必要に応じて発泡剤が添加されたエポキシ系樹脂
７を重量を制御しながら、一様に塗布する。この場合、
図に示すように、前記エポキシ系樹脂７は、注油器等の
塗布具８を用い、不織布片２の裾部がら頂部に向って、
同頂部な中心とした螺線を描くようにしてたらすように
塗布するとよい。次に、−この不織布片２の上面側に、
前記不織布片３．４を順次積層する。この場合、不織布
片４の繊維方向は、不織布片２の繊維方向に略直交させ
る。なお、第３図においては、不織布片１．２．４の繊
維方向？矢印によって示しである。Next, as shown in FIG. 3, the conical receiver places the nonwoven fabric piece 1 on the stand 6, and on top of this nonwoven fabric piece 1, the nonwoven fabric piece 2 is placed on the nonwoven fabric piece 1 and the fibers. The layers are stacked so that the directions are substantially perpendicular. Next, the blended epoxy resin 7 to which a foaming agent has been added as required is uniformly applied to the upper surface of the nonwoven fabric piece 2 while controlling the weight. in this case,
As shown in the figure, the epoxy resin 7 is applied from the hem of the nonwoven fabric piece 2 toward the top using an applicator 8 such as a lubricator.
It is best to apply in a trickling motion in a spiral pattern centered at the same top. Next, on the top side of this nonwoven fabric piece 2,
The nonwoven fabric pieces 3.4 are laminated one after another. In this case, the fiber direction of the nonwoven fabric piece 4 is made substantially orthogonal to the fiber direction of the nonwoven fabric piece 2. In addition, in FIG. 3, the fiber direction of the nonwoven fabric piece 1.2.4? Indicated by arrows.

次に、上記のようにして積層された不織布片１〜４を、
必要に応じて予備加熱し、前記エポキシ系樹脂７を半硬
化状態にする。このようにすれば、積層された不織布片
１〜４を移動あるいは運搬する場合に、前記エポキシ系
樹脂７が流ね出したり、あるいは片寄ってしまったりす
る處れかない。なお、エポキシ系樹脂７は、常洗１にお
いてもある程度の時間放匠すれば半硬化状態になるから
、この予備加熱工程は必ずしも必要ではない。Next, the nonwoven fabric pieces 1 to 4 laminated as described above are
If necessary, preheating is performed to bring the epoxy resin 7 into a semi-cured state. In this way, when moving or transporting the laminated nonwoven fabric pieces 1 to 4, there is no risk that the epoxy resin 7 will flow out or be shifted to one side. Note that this preheating step is not necessarily necessary since the epoxy resin 7 becomes a semi-hardened state if left to stand for a certain period of time even in the regular washing step 1.

次に、上記の不織布片１〜４を、第４図に示すように、
コーン成形用の金型９ａ、９ｂによって加熱プレスする
。この場合の加熱プレスは、例えば１８０℃ｉｔｌ後の
温度で５分間程度行なう。このようにすれば、不織布片
１〜４全体に、前記エポキシ系樹脂７が浸入し、かつ硬
化する。ところで、この工程において各不織布片が変形
される鰍、すなわち繊維が伸張あるいは収縮される素は
、これら不織布片が既にコーン状に仮成形されたもので
あるから、極めて少ない。また、エポキシ系樹脂７内に
発泡剤が添加されている場合には、この樹層中に、独立
した非連続の気泡を生じる。これにより振動板の見かけ
上の密度が小さくなり、かつ断面２次モーメントエが大
きくなり、もって比ヤング率Ｅ／ρ、曲げ剛性Ｅ・■を
より向上させることができる。なお、以上の工程に従っ
て製造されたコーン１０の断面図を第５図に示しておく
。Next, as shown in FIG. 4, the above-mentioned nonwoven fabric pieces 1 to 4 are
Heat pressing is performed using molds 9a and 9b for cone molding. The hot pressing in this case is carried out for about 5 minutes at a temperature of 180° C. itl, for example. In this way, the epoxy resin 7 penetrates into the entire nonwoven fabric pieces 1 to 4 and is cured. By the way, in this step, the amount of deformation of each nonwoven fabric piece, that is, the amount of fiber expansion or contraction, is extremely small because these nonwoven fabric pieces have already been temporarily formed into a cone shape. Further, when a foaming agent is added to the epoxy resin 7, independent and discontinuous cells are generated in this tree layer. This reduces the apparent density of the diaphragm and increases the second moment of area E, thereby making it possible to further improve the specific Young's modulus E/ρ and the bending rigidity E·■. Incidentally, a cross-sectional view of the cone 10 manufactured according to the above steps is shown in FIG.

次に、この発明を適用してスピーカのコーン振動板全製
造する場合の他の実施例を、第６図ないし第１０図を参
照して説明する。Next, another embodiment in which the entire cone diaphragm of a speaker is manufactured by applying the present invention will be described with reference to FIGS. 6 to 10.

この実施例において用いられた不織布は、炭紫１１ｅか
らなると共に、バインダとして熱可塑性樹脂を含み、か
つ繊維方向が無秩序なものである。The nonwoven fabric used in this example was made of Charcoal Purple 11e, contained a thermoplastic resin as a binder, and had random fiber directions.

まず、上記不織布から所定径を有する平面視円形の不織
布片１１を裁断または打ち抜きして劉・る。First, a nonwoven fabric piece 11 having a predetermined diameter and a circular shape in plan view is cut or punched from the nonwoven fabric.

そして、この不織布片１１を、第６図に示すように、コ
ーン成形用の雌金型１２＆の型面上に載置された受は台
１３上に載置した後、その周縁部を環状の押え具１４に
よって押さえ、しかる後、ｔｔＪ’＝金型１２ｂによっ
て加熱プレスする。Then, as shown in FIG. 6, this piece of nonwoven fabric 11 is placed on the mold surface of the female mold 12 for cone molding, and then placed on the stand 13. It is pressed with the presser 14, and then heated and pressed with the ttJ'=metal mold 12b.

次に、上記のようにして仮成形された不織布片１１を受
は台１３ごと、金型１２ａから取り出し、この不織布片
１１の上面に、＠７図に示すように、エポキシ系樹脂７
を周縁部を除いて一様に塗布する。　　　　− 次に、必要に応じて、上記エポキシ系樹脂７が半硬化状
態になるまで、予備加熱する。Next, the nonwoven fabric piece 11 temporarily formed as described above is taken out from the mold 12a along with the support 13, and an epoxy resin 7 is applied to the upper surface of the nonwoven fabric piece 11 as shown in Figure @7.
Apply evenly except for the periphery. - Next, if necessary, the epoxy resin 7 is preheated until it becomes a semi-hardened state.

次いで、前記不織布片１１を受は台１３から取り出し、
この不織布片１１を、第８図に示すように、コーン成形
用の金型１２ａ、１２ｂによって加熱プレスする。この
場合、前記エポキシ系樹脂７は、第９図に示すように、
不織布片１１０周縁部まで一様に浸入し硬化する。Next, the nonwoven fabric piece 11 is taken out from the stand 13,
As shown in FIG. 8, this nonwoven fabric piece 11 is heated and pressed using cone molds 12a and 12b. In this case, the epoxy resin 7, as shown in FIG.
It evenly penetrates to the periphery of the nonwoven fabric piece 110 and hardens.

かくして、上記のような工程によれば、第１０図に示す
ようなコーン振動板１０が、得られる。Thus, according to the above steps, a cone diaphragm 10 as shown in FIG. 10 is obtained.

以上の説明から明らかなように、この発明による電気音
響変換器における振動板の製造方法は、高弾性繊維から
なる不織布を振動板の形状に仮成形する第１の工程と、
この不織布に熱硬化性樹脂を塗布する第２の工程と、こ
の熱硬化性樹脂をプリプレグ状態になるまで予備加熱す
る第３の工程と、振動板の形状に加熱プレスして、前記
熱硬化性樹脂を前記不織布に浸入させて固化する第４の
工程とからなるものであるから、次のような効果が得ら
れる。As is clear from the above description, the method for manufacturing a diaphragm in an electroacoustic transducer according to the present invention includes a first step of temporarily forming a nonwoven fabric made of high elastic fibers into the shape of a diaphragm;
A second step of applying a thermosetting resin to this nonwoven fabric, a third step of preheating this thermosetting resin until it becomes a prepreg state, and hot pressing it into the shape of a diaphragm and applying the thermosetting resin to the nonwoven fabric. Since the method includes a fourth step of infiltrating the resin into the nonwoven fabric and solidifying it, the following effects can be obtained.

（ｉ）　　不織布は熱硬化性樹脂が塗布される前に仮成
形されているから、加熱プレスによって最終的な振動板
の形状に固化成形する場合の繊維の伸張、収縮量が相対
的に少なくなり、したがって絞りの深い形状あるいは複
＠＃な形状の振動板の成形が極めて容易となる。(i) Since the nonwoven fabric is preformed before the thermosetting resin is applied, the amount of expansion and contraction of the fibers is relatively small when it is solidified and formed into the final shape of the diaphragm using a hot press. Therefore, it is extremely easy to form a diaphragm with a deep drawing shape or a multi-shape shape.

−（ｉｉ）　　振動板の板厚および重量を、仮成形され
た不織布に塗布する熱硬化性樹脂の量によって容易に調
整することが可能になる。-(ii) The thickness and weight of the diaphragm can be easily adjusted by adjusting the amount of thermosetting resin applied to the temporarily formed nonwoven fabric.

（ｉｉ）　　熱硬化性樹脂は、最終段階の加熱プレス時
の直前に、調合および塗布すればよいから、この熱硬化
性樹脂を未調合状態で長期間かつ通常の環境で保管する
ことが可能になる。(ii) Since the thermosetting resin only needs to be prepared and applied immediately before the final stage of hot pressing, it is possible to store the thermosetting resin in an unmixed state for a long period of time in a normal environment. Become.

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

第１図ないし第５図はこの発明を適用してスピーカのコ
ーン振動板を製造する場合の一実施例を示すもので、第
１図は不織布片の平面図、第２図はこれら不織布片を仮
成形する工程を示す断面図、第３図はこれら不織布片を
積層しかつ熱硬化性樹脂を塗布する工程を示す断面図、
箪４図は積層された不織布片に熱硬化性樹脂を浸入硬化
させる工程を示す断面図、第５図はこの実施例により製
造されたコーン振＠板の断面図、第６図ないし竿ｉｏｍ
はこの発明を適用してスピーカのコーン振動板を製造す
る場合の他の実施例を示すもので、第６図は仮成形工程
を示す断面図、第７図は熱硬化性樹脂を塗布する工程を
示す断面図、第８図および第９図は同熱硬化性樹脂の浸
入固化工程を示す断面図、第１０図はこの実施例により
１！ｌ！造されたコーン振動板の断面図である。 １〜４・・・・・不織布片（不織布）、５＆、５ｂ・・
・・・仮成形用の金型、７・・・・・　エポキシ系樹脂
（熱硬化性樹脂）、９＆、９′ｂ・・・・・コーン成、
形用の金型、１０　・・・・・コーン振動板。Figures 1 to 5 show an example of manufacturing a cone diaphragm for a speaker by applying the present invention. Figure 1 is a plan view of a piece of nonwoven fabric, and Figure 2 is a plan view of a piece of nonwoven fabric. FIG. 3 is a cross-sectional view showing the step of temporarily molding, and FIG. 3 is a cross-sectional view showing the step of laminating these nonwoven fabric pieces and applying a thermosetting resin.
Fig. 4 is a cross-sectional view showing the process of infiltrating and curing the thermosetting resin into the laminated nonwoven fabric pieces, Fig. 5 is a cross-sectional view of the cone shaker plate manufactured according to this example, and Fig. 6 to the rod iom.
6 shows another embodiment in which a cone diaphragm for a speaker is manufactured by applying this invention. FIG. 6 is a sectional view showing a temporary molding process, and FIG. 7 is a process of applying a thermosetting resin. FIG. 8 and FIG. 9 are cross-sectional views showing the step of infiltrating and solidifying the thermosetting resin, and FIG. 10 is a cross-sectional view showing 1! l! FIG. 3 is a cross-sectional view of the manufactured cone diaphragm. 1 to 4...Nonwoven fabric piece (nonwoven fabric), 5&, 5b...
...Mold for temporary molding, 7... Epoxy resin (thermosetting resin), 9&, 9'b... Cone formation,
Mold for shape, 10... Cone diaphragm.

Claims (4)

【特許請求の範囲】[Claims] （１）ｈ）　　高弾性繊維からなる不織布を振動板の形
状またはこれと略等しい形状に仮成形する第１の工程と
１ （ｂ）　　仮成形された前記不織布の表面に熱硬化性樹
脂を塗布する第２の工程と、　゛ （０）　　必要に応じて、前記不織布に塗布された熱硬
化性樹脂をプレプレグ状態になるまで予備加熱する第３
の工程と、 （ｄ）　　前記熱硬化性樹脂が塗布された不織布を前記
振動板の形状に加熱プレスし、前記熱硬化性樹脂を前記
不織布に浸入させて固化する第４の工程と、からなる電
気音響変換器における振動板の製造方法。(1) h) A first step of temporarily forming a nonwoven fabric made of high elastic fibers into the shape of a diaphragm or a shape substantially equivalent to this; and 1 (b) Applying a thermosetting resin to the surface of the temporarily formed nonwoven fabric.゛(0) If necessary, a third step of preheating the thermosetting resin applied to the nonwoven fabric until it becomes a prepreg state.
and (d) a fourth step of heat-pressing the nonwoven fabric coated with the thermosetting resin into the shape of the diaphragm, and infiltrating the thermosetting resin into the nonwoven fabric and solidifying it. A method for manufacturing a diaphragm in an electroacoustic transducer. （２）前記高弾性繊維からなる不織布として繊維方向が
無秩序なものを用いることを特徴とする特許請求の範囲
第１項記載の電気音響変換器における振動板の製造方法
。(2) A method for manufacturing a diaphragm in an electroacoustic transducer according to claim 1, characterized in that the nonwoven fabric made of high elastic fibers is a nonwoven fabric with random fiber directions. （３）前記第１の工程における不織布が繊維に方向性を
有する複数枚の不織布からなり、これら複数枚の不織布
が前記第４の工程以前の工程で互いに繊維方向が異なる
関係において積層されることを特徴とする特許請求の範
囲第１項記載の電気音響変換器における振動板の製造方
法。(3) The nonwoven fabric in the first step is composed of a plurality of nonwoven fabrics whose fibers have directionality, and these plurality of nonwoven fabrics are laminated in a relationship in which the fiber directions are different from each other in steps before the fourth step. A method for manufacturing a diaphragm in an electroacoustic transducer according to claim 1, characterized in that: （４）前記熱硬化性樹脂として、発泡剤が添加された熱
硬化性樹脂が用いられ、前記＠４の工程においてこれら
発泡剤を発泡させるようにすることを特徴とする特許請
求の範囲第１項ないし第３項記載の電気音響変換器にお
ける振動板の＠全方法。(4) A thermosetting resin to which a foaming agent is added is used as the thermosetting resin, and the foaming agent is foamed in the step @4. @Complete method for the diaphragm in the electroacoustic transducer according to items 1 to 3.
JP6405983A 1983-04-12 1983-04-12 Production of diaphragm of electroacoustic transducer Pending JPS59189799A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6405983A JPS59189799A (en) 1983-04-12 1983-04-12 Production of diaphragm of electroacoustic transducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6405983A JPS59189799A (en) 1983-04-12 1983-04-12 Production of diaphragm of electroacoustic transducer

Publications (1)

Publication Number Publication Date
JPS59189799A true JPS59189799A (en) 1984-10-27

Family

ID=13247136

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6405983A Pending JPS59189799A (en) 1983-04-12 1983-04-12 Production of diaphragm of electroacoustic transducer

Country Status (1)

Country Link
JP (1) JPS59189799A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5110776A (en) * 1974-07-17 1976-01-28 Hitachi Ltd SHUSEKIKAIROSOCHI
JPS5578699A (en) * 1978-12-08 1980-06-13 Pioneer Electronic Corp Manufacture of speaker diaphragm

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5110776A (en) * 1974-07-17 1976-01-28 Hitachi Ltd SHUSEKIKAIROSOCHI
JPS5578699A (en) * 1978-12-08 1980-06-13 Pioneer Electronic Corp Manufacture of speaker diaphragm

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