JP4633828B2

JP4633828B2 - Method for manufacturing vibration system component for electroacoustic transducer and vibration system component for electroacoustic transducer manufactured by this method

Info

Publication number: JP4633828B2
Application number: JP2008172276A
Authority: JP
Inventors: 健太祐嶋; 貴三国谷
Original assignee: Foster Electric Co Ltd
Current assignee: Foster Electric Co Ltd
Priority date: 2008-07-01
Filing date: 2008-07-01
Publication date: 2011-02-16
Anticipated expiration: 2028-07-01
Also published as: JP2010016455A

Description

この発明は振動板を含む電気音響変換器の振動系部品を、エレクトロスピニング法による製膜工程を利用した成形体として製造する方法、およびこの方法により製造した成形体でなる電気音響変換器用振動系部品に関する。 The present invention relates to a method of manufacturing a vibration system component of an electroacoustic transducer including a diaphragm as a molded body using a film forming process by an electrospinning method, and a vibration system for an electroacoustic transducer formed of the molded body manufactured by this method. Regarding parts.

一般的な電気音響変換器において振動板の振動に連携する振動系を構成する部品には、振動板以外に、エッジ、ダンパー、制動材、ボイスコイル用のボビンが含まれ、これら部品の製造に当たっては部品に応じて織布、不織布、シート状又はフィルム状の材料から選んだいずれかを加熱或いは非加熱の状態で所望の形状に成形した後、夫々の寸法に切り出す。特に、エッジの場合には所望の含浸剤を含浸した織布シートの加熱成形、未加硫ゴムの加熱成形或いは加熱発泡成形が行われ、ダンパーの場合には含浸織布の加熱成形が行われ、振動板においてはフィルム材の加圧成形が行われ、制動材では通気性のある発泡材が用いられ、ボビンにはシート材料の切り出しと成形が行われる。つまり、同じ振動系であっても部品毎に異なる用途に応じて要求される物性が異なり、それに応じて使用可能な材料の厚さ、密度と材質が変わり、適合する成形等の加工法も変化する。 In general electroacoustic transducers, the components that make up the vibration system that cooperates with the vibrations of the diaphragm include edges, dampers, braking materials, and bobbins for voice coils in addition to the diaphragm. Is formed from a woven fabric, a non-woven fabric, a sheet-like material, or a film-like material according to the part into a desired shape in a heated or non-heated state, and then cut into respective dimensions. In particular, in the case of the edge, the heat forming of the woven fabric sheet impregnated with the desired impregnating agent, the heat forming of the unvulcanized rubber or the heat foaming is performed, and in the case of the damper, the heat forming of the impregnated woven fabric is performed. The diaphragm is pressure-molded with a film material, the brake material is a breathable foam material, and the bobbin is cut out and molded with a sheet material. In other words, even with the same vibration system, the required physical properties differ depending on the application for each part, and the thickness, density and material of the usable material change accordingly, and the processing methods such as molding change accordingly. To do.

振動系の各部品自体もまた、スピーカーの用途に応じて物性、形状等が変化し、これら変化に応じて同じ種類の部品であっても製造方法は変化するが、この点に対処して、例えば振動板の製造方法において、成形形状の自由度を大きくするために、熱可塑性樹脂繊維を含む不織布を当該繊維の軟化温度より高く、溶融温度より低い温度で、キャビティ厚を変化させた金型により熱プレス成形する振動板製造方法が提案されている（特許文献１参照）。しかし、使用する不織布はシート状であり、厚さ、密度ならびに材質は一定のものであるため、金型のキャビティ厚の大きな部位でシート状不織布が可能とする厚さの増加には限度があり、成形形状の自由度も限定的である。 Each part of the vibration system itself also changes in physical properties, shape, etc. according to the use of the speaker, and even if it is the same type of part according to these changes, the manufacturing method also changes. For example, in a manufacturing method of a diaphragm, in order to increase the degree of freedom of the molding shape, a mold in which a nonwoven fabric containing a thermoplastic resin fiber is changed in cavity thickness at a temperature higher than the softening temperature of the fiber and lower than the melting temperature. Has proposed a method for manufacturing a diaphragm by hot press molding (see Patent Document 1). However, since the nonwoven fabric used is sheet-like, and the thickness, density and material are constant, there is a limit to the increase in thickness that the sheet-like nonwoven fabric can provide at the site where the mold cavity thickness is large. Also, the degree of freedom of the forming shape is limited.

一方、振動板を初めとする電気音響変換器の振動系部品の材料として近時多用される不織布の製造方法に、エレクトロスピニング法があることが知られている（非特許文献１参照）。このエレクトロスピニング法はポリマー溶液に例えばプラスの高電圧を印加し、対向する電極板をマイナスに帯電させると、電圧条件等により溶液は電極に向かって円錐形あるいは球形となり、その先端から繊維化あるいは滴化された溶液が電極板の全面に飛び散り、堆積して不織布あるいはフィルム、またはそれらの中間体を形成するものであり、堆積の厚さは１μmから１０cm程度までの幅を持つので、成形形状の自由度は格段に高いと思われる。しかし、電気音響変換器用振動系部品の製造のために、これまでエレクトロスピニング法によって得られたシート状の不織布を用いることはあっても、振動系部品のそれぞれの厚さや形状に応じて振動系部品をエレクトロスピニング法で直接製造する試みは未だなされていない。
特開平６−１３３３９２号公報「エレクトロスピニング最前線−ナノファイバー創製への挑戦−」山下義祐著、株式会社繊維社企画出版、大阪市、２００７年１１月２０日発行 On the other hand, it is known that there is an electrospinning method as a method of manufacturing a nonwoven fabric frequently used as a material for vibration system parts of electroacoustic transducers including a diaphragm (see Non-Patent Document 1). In this electrospinning method, for example, when a positive high voltage is applied to the polymer solution and the opposite electrode plate is negatively charged, the solution becomes a conical shape or a spherical shape toward the electrode depending on the voltage condition or the like. Dropped solution scatters over the entire surface of the electrode plate and deposits to form a non-woven fabric or film, or an intermediate thereof. The thickness of the deposited film ranges from about 1 μm to about 10 cm. The degree of freedom seems to be much higher. However, for the manufacture of vibration system parts for electroacoustic transducers, even though sheet-like non-woven fabrics obtained by electrospinning methods have been used so far, vibration systems are used according to the thickness and shape of the vibration system parts. No attempt has been made to produce parts directly by electrospinning.
JP-A-6-133392 “Forefront of electrospinning-Challenge to creation of nanofibers” by Yoshisuke Yamashita, Textile Company Planning Publishing, Osaka City, November 20, 2007

上記したように電気音響変換器用振動系部品は互いに異なる形状、寸法、物性等を持つためこれら条件に合わせて選ばれる工程ないし方法で製造されており、また、同種の部品であっても変換器の用途の変化と共に部品に要求される条件も変わり、その都度工程ないし方法を変えて製造しなければならないが、少なくとも複数種の部品に共通して採用可能な製造方法は現存しない。原材料についても各種形状、寸法の部品を画一的なシート材或いはフィルム材から切り出しているため、切り屑の発生も多く、時間的、資源的なコストの軽減は困難である。また、画一的なシート或いはフィルム材を使用する場合、成形上の自由度にも限度があり、部品に要求される厚さが大きい場合に対応できない。 As described above, the vibration system parts for electroacoustic transducers have different shapes, dimensions, physical properties, etc., so they are manufactured by processes or methods selected according to these conditions. The conditions required for parts also change with the change of the application, and the process or method must be changed each time. However, there is no manufacturing method that can be commonly used for at least a plurality of types of parts. As for the raw material, parts of various shapes and sizes are cut out from a uniform sheet material or film material, so that there are many generations of chips, and it is difficult to reduce time and resource costs. In addition, when a uniform sheet or film material is used, there is a limit to the degree of freedom in molding, and it is not possible to cope with the case where the thickness required for the parts is large.

本発明はこれらの問題を解決するために提案されたもので、本来シート状不織布の製造においてシートの厚さを含む３次元形状の自由度の高い、また各種物性に適合するための原材料と添加物の選択の自由度が高いエレクトロスピニング法を利用して、電気音響変換器用振動系の各種部品を製造する方法と、この方法で製造された各種部品とを提供することを目的とする。 The present invention has been proposed to solve these problems. In the manufacture of a sheet-like nonwoven fabric, a raw material and an additive for adding a high degree of freedom of a three-dimensional shape including the thickness of the sheet and adapting to various physical properties. An object of the present invention is to provide a method of manufacturing various parts of a vibration system for an electroacoustic transducer using an electrospinning method with a high degree of freedom in selecting an object, and various components manufactured by this method.

上記課題を解決するため、本発明による請求項１の電気音響変換器用振動系部品の製造方法は、電気音響変換器用振動系の所望の部品を製造するためのポリマー溶液を収容しかつ溶液出口を有する容器を用意し、所望部品の所望の表面形状を有する型体をポリマー溶液容器の溶液出口に対向させて配置し、ポリマー溶液にプラスまたはマイナスの高電圧を印加すると共に型体の所望表面形状部分をマイナスまたはプラスに帯電させることにより、溶液出口の先端から繊維化または滴化したポリマーを型体の所望表面形状部分上に所定の厚さまで堆積させる各工程でなり、エレクトロスピニング法により所望の表面形状で所定の厚さに形成した成形体を所望の部品とする電気音響変換器用振動系部品の製造方法において、前記ポリマー溶液は複数種のポリマー溶液が用意され、マイナスまたはプラスに帯電させた型体に対して繊維化または滴化した第１のポリマー溶液を所定の厚さに堆積させた後、徐々に組成の異なる第２のポリマー溶液による堆積に切り替えることにより、製造される成形体を傾斜構造とすることを特徴とする。
本発明による請求項２の電気音響変換器用振動系部品の製造方法は、電気音響変換器用振動系の所望の部品を製造するためのポリマー溶液を収容しかつ溶液出口を有する容器を用意し、所望部品の所望の表面形状を有する型体をポリマー溶液容器の溶液出口に対向させて配置し、ポリマー溶液にプラスまたはマイナスの高電圧を印加すると共に型体の所望表面形状部分をマイナスまたはプラスに帯電させることにより、溶液出口の先端から繊維化または滴化したポリマーを型体の所望表面形状部分上に所定の厚さまで堆積させる各工程でなり、エレクトロスピニング法により所望の表面形状で所定の厚さに形成した成形体を所望の部品とする電気音響変換器用振動系部品の製造方法において、マイナスまたはプラスに帯電させた型体に対して繊維化または滴化したポリマー溶液を所定の厚さに堆積させた後、徐々に密度の異なる同一のポリマー溶液による堆積に切り替えることにより、製造される成形体に傾斜密度を持たせることを特徴とする。
本発明による請求項３の電気音響変換器用振動系部品の製造方法は、電気音響変換器用振動系の所望の部品を製造するためのポリマー溶液を収容しかつ溶液出口を有する容器を用意し、所望部品の所望の表面形状を有する型体をポリマー溶液容器の溶液出口に対向させて配置し、ポリマー溶液にプラスまたはマイナスの高電圧を印加すると共に型体の所望表面形状部分をマイナスまたはプラスに帯電させることにより、溶液出口の先端から繊維化または滴化したポリマーを型体の所望表面形状部分上に所定の厚さまで堆積させる各工程でなり、エレクトロスピニング法により所望の表面形状で所定の厚さに形成した成形体を所望の部品とする電気音響変換器用振動系部品の製造方法において、型体の所望表面形状部分をマイナスまたはプラスに帯電させる工程は、当該表面形状部分のうちの特定部分をプラスまたはマイナスに帯電させる工程を含み、マイナスまたはプラス帯電部分への第１のポリマー溶液の繊維化または滴化堆積工程に引続いて、プラスまたはマイナス帯電させた特定部分を改めてマイナスまたはプラスに帯電させて組成の異なる第２のポリマー溶液を繊維化または滴化させ堆積させる工程を含むことを特徴とする。
本発明による請求項４の電気音響変換器用振動系部品の製造方法は、電気音響変換器用振動系の所望の部品を製造するためのポリマー溶液を収容しかつ溶液出口を有する容器を用意し、所望部品の所望の表面形状を有する型体をポリマー溶液容器の溶液出口に対向させて配置し、ポリマー溶液にプラスまたはマイナスの高電圧を印加すると共に型体の所望表面形状部分をマイナスまたはプラスに帯電させることにより、溶液出口の先端から繊維化または滴化したポリマーを型体の所望表面形状部分上に所定の厚さまで堆積させる各工程でなり、エレクトロスピニング法により所望の表面形状で所定の厚さに形成した成形体を所望の部品とする電気音響変換器用振動系部品の製造方法において、型体の所望表面形状部分をマイナスまたはプラスに帯電させる工程は、当該表面形状部分のうちの特定部分をプラスまたはマイナスに帯電させる工程を含み、マイナスまたはプラス帯電部分への第１の所定厚さまでのポリマー溶液の堆積工程に引続いて、プラスまたはマイナス帯電させた特定部分を改めてマイナスまたはプラスに帯電させ、同一のポリマー溶液による第２の所定厚さまでの堆積を行う工程を含むことを特徴とする。
本発明による請求項５の電気音響変換器用振動系部品は、電気音響変換器用振動系の所望の部品を製造するためのポリマー溶液を収容しかつ溶液出口を有する容器を用意し、所望部品の所望の表面形状を有する型体をポリマー溶液容器の溶液出口に対向させて配置し、ポリマー溶液にプラスまたはマイナスの高電圧を印加すると共に型体の所望表面形状部分をマイナスまたはプラスに帯電させることにより、溶液出口の先端から繊維化または滴化したポリマーを型体の所望表面形状部分上に所定の厚さまで堆積させる各工程を介して、エレクトロスピニング法により所望の表面形状で所定の厚さに形成した成形体でなる電気音響変換器用振動系部品において、マイナスまたはプラスに帯電させた型体に対して繊維化または滴化した第１のポリマー溶液を所定の厚さに堆積させた後、徐々に組成の異なる第２のポリマー溶液による堆積に切り替えることにより、製造される成形体を傾斜構造としたことを特徴とする。
本発明による請求項６の電気音響変換器用振動系部品は、電気音響変換器用振動系の所望の部品を製造するためのポリマー溶液を収容しかつ溶液出口を有する容器を用意し、所望部品の所望の表面形状を有する型体をポリマー溶液容器の溶液出口に対向させて配置し、ポリマー溶液にプラスまたはマイナスの高電圧を印加すると共に型体の所望表面形状部分をマイナスまたはプラスに帯電させることにより、溶液出口の先端から繊維化または滴化したポリマーを型体の所望表面形状部分上に所定の厚さまで堆積させる各工程を介して、エレクトロスピニング法により所望の表面形状で所定の厚さに形成した成形体でなる電気音響変換器用振動系部品において、マイナスまたはプラスに帯電させた型体に対して繊維化または滴化したポリマー溶液を所定の厚さに堆積させた後、徐々に密度の異なる同一のポリマー溶液による堆積に切り替えることにより、製造される成形体に傾斜密度を持たせたことを特徴とする。
本発明による請求項７の電気音響変換器用振動系部品は、電気音響変換器用振動系の所望の部品を製造するためのポリマー溶液を収容しかつ溶液出口を有する容器を用意し、所望部品の所望の表面形状を有する型体をポリマー溶液容器の溶液出口に対向させて配置し、ポリマー溶液にプラスまたはマイナスの高電圧を印加すると共に型体の所望表面形状部分をマイナスまたはプラスに帯電させることにより、溶液出口の先端から繊維化または滴化したポリマーを型体の所望表面形状部分上に所定の厚さまで堆積させる各工程を介して、エレクトロスピニング法により所望の表面形状で所定の厚さに形成した成形体でなる電気音響変換器用振動系部品において、型体の所望表面形状部分をマイナスまたはプラスに帯電させる工程は、当該表面形状部分のうちの特定部分をプラスまたはマイナスに帯電させる工程を含み、マイナスまたはプラス帯電部分への第１のポリマー溶液の繊維化または滴化堆積工程に引続いて、プラスまたはマイナス帯電させた特定部分を改めてマイナスまたはプラスに帯電させて組成の異なる第２のポリマー溶液を繊維化または滴化させ堆積させる工程を含んで形成された成形体でなることを特徴とする。
本発明による請求項８の電気音響変換器用振動系部品は、電気音響変換器用振動系の所望の部品を製造するためのポリマー溶液を収容しかつ溶液出口を有する容器を用意し、所望部品の所望の表面形状を有する型体をポリマー溶液容器の溶液出口に対向させて配置し、ポリマー溶液にプラスまたはマイナスの高電圧を印加すると共に型体の所望表面形状部分をマイナスまたはプラスに帯電させることにより、溶液出口の先端から繊維化または滴化したポリマーを型体の所望表面形状部分上に所定の厚さまで堆積させる各工程を介して、エレクトロスピニング法により所望の表面形状で所定の厚さに形成した成形体でなる電気音響変換器用振動系部品において、型体の所望表面形状部分をマイナスまたはプラスに帯電させる工程は、当該表面形状部分のうちの特定部分をプラスまたはマイナスに帯電させる工程を含み、マイナスまたはプラス帯電部分への第１の所定厚さまでのポリマー溶液の堆積工程に引続いて、プラスまたはマイナス帯電させた特定部分を改めてマイナスまたはプラスに帯電させ、同一のポリマー溶液による第２の所定厚さまでの堆積を行う工程を含んで形成された成形体でなることを特徴とする。
In order to solve the above-mentioned problems, a method for manufacturing a vibration system component for an electroacoustic transducer according to claim 1 of the present invention contains a polymer solution for manufacturing a desired component of a vibration system for an electroacoustic transducer and has a solution outlet. A container having a desired surface shape of a desired part is arranged facing the solution outlet of the polymer solution container, and a positive or negative high voltage is applied to the polymer solution and a desired surface shape of the mold body By charging the portion negatively or positively, the polymerized fiber or droplet from the tip of the solution outlet is deposited to a predetermined thickness on the desired surface shape portion of the mold, and a desired thickness is obtained by electrospinning. In the method of manufacturing a vibration system part for an electroacoustic transducer, in which a molded body formed with a surface shape and a predetermined thickness is used as a desired part, the polymer solution contains a plurality of polymer solutions. A seed polymer solution is prepared, and a first polymer solution that is fiberized or dropped onto a negatively or positively charged mold is deposited to a predetermined thickness, and then a second composition having a different composition gradually. By switching to the deposition by the polymer solution, the molded body to be manufactured has an inclined structure.
According to a second aspect of the present invention, there is provided a method for producing a vibration system component for an electroacoustic transducer, comprising preparing a container containing a polymer solution for producing a desired component of a vibration system for an electroacoustic transducer and having a solution outlet. Place the mold with the desired surface shape of the part facing the solution outlet of the polymer solution container, apply a positive or negative high voltage to the polymer solution and charge the desired surface shape part of the mold negatively or positively Each of the steps of depositing the fiberized or dropletized polymer from the tip of the solution outlet to a predetermined thickness on the desired surface shape portion of the mold, and by the electrospinning method, the predetermined thickness with the desired surface shape. In a method of manufacturing a vibration system part for an electroacoustic transducer, in which a molded body formed in a desired part is used, a negatively or positively charged mold body It is characterized in that, after depositing a polymer solution that has been regenerated or dripped into a predetermined thickness, by gradually switching to deposition with the same polymer solution having a different density, the molded article to be produced has a gradient density. To do.
Method of manufacturing an electro-acoustic transducer vibration system part according to claim 3 of the present invention is to provide a container having a receive and a solution outlet of the polymer solution to produce the desired part of the electric acoustic converter vibration system, A mold having a desired surface shape of a desired part is placed opposite to the solution outlet of the polymer solution container, and a positive or negative high voltage is applied to the polymer solution and the desired surface shape portion of the mold is made negative or positive. It consists of each step of depositing a polymer that has been fibrillated or dropped from the tip of the solution outlet to a predetermined thickness on the desired surface shape portion of the mold by charging, and has a predetermined surface shape and a predetermined thickness by electrospinning. In the method of manufacturing a vibration system part for an electroacoustic transducer using the formed body as a desired part, the desired surface shape portion of the mold is minus or plus. The step of charging includes a step of positively or negatively charging a specific portion of the surface-shaped portion, and following the fiberizing or dropping deposition step of the first polymer solution on the negatively or positively charged portion, The method includes a step of charging a specific portion that is positively or negatively charged again to be negatively or positively and forming a second polymer solution having a different composition into a fiber or a droplet and depositing it.
Method of manufacturing an electro-acoustic transducer vibration system part according to claim 4 of the present invention is to provide a container having a receive and a solution outlet of the polymer solution to produce the desired part of the electric acoustic converter vibration system, A mold having a desired surface shape of a desired part is placed opposite to the solution outlet of the polymer solution container, and a positive or negative high voltage is applied to the polymer solution and the desired surface shape portion of the mold is made negative or positive. It consists of each step of depositing a polymer that has been fibrillated or dropped from the tip of the solution outlet to a predetermined thickness on the desired surface shape portion of the mold by charging, and has a predetermined surface shape and a predetermined thickness by electrospinning. In the method of manufacturing a vibration system part for an electroacoustic transducer using the formed body as a desired part, the desired surface shape portion of the mold is minus or plus. The step of charging includes a step of positively or negatively charging a specific portion of the surface shape portion, and following the step of depositing the polymer solution up to the first predetermined thickness on the negatively or positively charged portion, Alternatively, the method includes a step of charging the specific portion that is negatively charged again to negative or positive and performing deposition to the second predetermined thickness with the same polymer solution.
According to the fifth aspect of the present invention, there is provided a vibration system component for an electroacoustic transducer comprising a container for containing a polymer solution for producing a desired component of the vibration system for an electroacoustic transducer and having a solution outlet. By placing a mold having a surface shape opposite to the solution outlet of the polymer solution container, applying a positive or negative high voltage to the polymer solution and charging the desired surface shape portion of the mold negatively or positively. Forming a polymer with a desired surface shape in a desired surface shape by an electrospinning method through each step of depositing a fiberized or dropped polymer from the tip of the solution outlet to a predetermined thickness on a desired surface shape portion of the mold In a vibration system part for an electroacoustic transducer formed of a molded body, a first poly fiber or droplet formed on a negatively or positively charged mold body After depositing over the solution to a predetermined thickness, by gradually switching to deposition by different second polymer solution compositions, characterized in that the moldings produced with the inclined structure.
Electroacoustic transducer vibration system part according to claim 6 according to the present invention is to provide a container having a receive and a solution outlet of the polymer solution to produce the desired part of the electric acoustic converter vibration system, the desired component A mold body having a desired surface shape is arranged facing the solution outlet of the polymer solution container, and a positive or negative high voltage is applied to the polymer solution and the desired surface shape portion of the mold body is charged negatively or positively. Thus, the polymer spun or dropped from the tip of the solution outlet is deposited to a predetermined thickness on the desired surface shape portion of the mold body to a predetermined thickness by the electrospinning method. In a vibration system part for an electroacoustic transducer, which is a formed product, a polymer solution that has been made into a fiber or droplets on a negatively or positively charged mold. After the deposited to a predetermined thickness, by gradually switching to depositing different by same polymer solution density, characterized in that to have a gradient density moldings produced.
Electroacoustic transducer vibration system part according to claim 7 according to the present invention is to provide a container having a receive and a solution outlet of the polymer solution to produce the desired part of the electric acoustic converter vibration system, the desired component A mold body having a desired surface shape is arranged facing the solution outlet of the polymer solution container, and a positive or negative high voltage is applied to the polymer solution and the desired surface shape portion of the mold body is charged negatively or positively. Thus, the polymer spun or dropped from the tip of the solution outlet is deposited to a predetermined thickness on the desired surface shape portion of the mold body to a predetermined thickness by the electrospinning method. In the vibration system part for an electroacoustic transducer formed of the formed body, the step of charging the desired surface shape portion of the mold body to minus or plus A specific portion that is positively or negatively charged following the step of fiberizing or dropping the first polymer solution onto the negatively or positively charged portion. It is characterized in that it is a molded body formed by a step of charging a second polymer solution having a different composition into fibers or droplets by depositing them negatively or positively again.
Electroacoustic transducer vibration system part according to claim 8 according to the present invention is to provide a container having a receive and a solution outlet of the polymer solution to produce the desired part of the electric acoustic converter vibration system, the desired component A mold body having a desired surface shape is arranged facing the solution outlet of the polymer solution container, and a positive or negative high voltage is applied to the polymer solution and the desired surface shape portion of the mold body is charged negatively or positively. Thus, the polymer spun or dropped from the tip of the solution outlet is deposited to a predetermined thickness on the desired surface shape portion of the mold body to a predetermined thickness by the electrospinning method. In the vibration system part for an electroacoustic transducer formed of the formed body, the step of charging the desired surface shape portion of the mold body to minus or plus Charging a specific portion of the portion positively or negatively, and following the step of depositing the polymer solution up to a first predetermined thickness on the negatively or positively charged portion, the positively or negatively charged specific portion is It is characterized in that it is a molded body formed including a step of being charged again negatively or positively and depositing up to a second predetermined thickness with the same polymer solution.

本発明によれば、電気音響変換器用振動系部品は、製品に求められる形状、厚さを含めた寸法ならびに物性の点で自由度の高いエレクトロスピニング法による不織布、フィルム材またはそれらの中間体を含む成形体として形成されるので、振動系に含まれる特定の部品に求められる物性の生成に必要な組成のポリマー溶液を、特定部品の所望の表面形状を持つ型体に対してエレクトロスピニング法により繊維化または滴化させて飛散させ、所望の厚さまで堆積させることによって得られる成形体が同時に特定部品を形成することになる。また、必要に応じて別の組成のポリマー溶液と、別の表面形状をもつ型体とを組合せて用いれば、同じエレクトロスピニング法によって別の振動系部品の製造を行なうことができる。 According to the present invention, a vibration system component for an electroacoustic transducer is formed from a non-woven fabric, a film material, or an intermediate thereof obtained by an electrospinning method having a high degree of freedom in terms of dimensions and physical properties required for a product. The polymer solution having the composition necessary for generating the physical properties required for the specific part included in the vibration system is applied to the mold having the desired surface shape of the specific part by the electrospinning method. The molded body obtained by forming into fiber or droplets, scattering and depositing to a desired thickness simultaneously forms a specific part. Further, if a polymer solution having a different composition and a mold having a different surface shape are used in combination as required, another vibration system component can be manufactured by the same electrospinning method.

型体として平坦表面や凹凸表面のものに加えて、連結する他の形成済み部品をインサートするインサート部を有するものを用いれば、未形成部品をなす成形体の形成と同時にインサート成形を行なえる。必要に応じて組成の異なるポリマー溶液を用い、本発明の製造方法の各工程を反復して行うことにより、多層構造の成形体でなる部品が得られる。例えば異なるポリマー溶液による２層構造において一方のポリマーの堆積を徐々に他方のポリマーの堆積に切り替えれば傾斜構造とすることができる。同様にして同じポリマー溶液で密度を傾斜させることもできる。また、製造すべき部品の一部を他の部分と異なる組成のポリマー溶液で形成する必要があれば、当該一部に対応する型体の一部を他部分と逆極性に帯電させて当該一部を除く他部分を先ず形成した後、対応一部のみの極性を変えて帯電させ、当該一部を形成することができる。この手法は部分的な厚さの変化に用いることもできる。製造すべき部品の選択は、使用するポリマー溶液を用意する際に、物性生成のための無機フィラーを添加することで容易に行なえる。 If a mold having a flat surface or an uneven surface and having an insert portion for inserting another formed component to be connected, insert molding can be performed simultaneously with the formation of a molded body forming an unformed component. By using a polymer solution having a different composition as necessary and repeatedly performing each step of the production method of the present invention, a part formed of a molded article having a multilayer structure can be obtained. For example, in a two-layer structure with different polymer solutions, a gradient structure can be obtained by gradually switching the deposition of one polymer to the deposition of the other polymer. Similarly, the density can be graded with the same polymer solution. Also, if it is necessary to form a part of a part to be manufactured with a polymer solution having a composition different from that of the other part, a part of the mold corresponding to the part is charged with the opposite polarity to the other part. After forming the other part except the part first, the polarity of only the corresponding part can be changed and charged to form the part. This technique can also be used for partial thickness changes. Selection of parts to be manufactured can be easily performed by adding an inorganic filler for producing physical properties when preparing a polymer solution to be used.

本発明を実施するための基本的な実施例１〜３を図１〜３について説明する。 Basic examples 1 to 3 for carrying out the present invention will be described with reference to FIGS.

図１は例えば平坦な平板状の振動板を製造する方法を実施する配列を略図的に示す。必要に応じて所定の物性を生成するための無機フィラーを添加して所望の振動板特性を生成し得る組成のポリマー溶液を用意する。このポリマー溶液を収容した容器１１は、その底部の溶液出口１１ａを型体１３の平坦な型面１４の略中央に向けて配置される。それぞれ導電性の容器１１と型体１３は、例えば電圧３０ｋＶで電流量が１ｍＡまでの高電圧発生器１５に接続され、例えば容器１１がプラスに、型体１３がマイナスにそれぞれ帯電される。エレクトロスピニングが生じる高電圧に達すると、容器１１を介してプラスに帯電されたポリマー溶液は容器１１の溶液出口１１ａから出て例えば円錐形の液滴を形成し、その液滴先端１２から細流となって流出し、ナノファイバー状態に繊維化されて、飛行線１６で示すように、マイナスに帯電された型体１３の平坦型面１４の全面に向けて飛散し、平坦型面１４上に付着し、ポリマー溶液と帯電が続く限り、換言すれば所望の厚さに達するまで、繊維化されたポリマーは堆積して不織布となり、平板状の振動板が形成される。 FIG. 1 schematically shows an arrangement for carrying out a method for producing, for example, a flat plate-like diaphragm. A polymer solution having a composition capable of generating desired diaphragm characteristics by adding an inorganic filler for generating predetermined physical properties as required is prepared. The container 11 containing the polymer solution is disposed with the solution outlet 11 a at the bottom thereof facing the substantially center of the flat mold surface 14 of the mold body 13. The conductive container 11 and the mold 13 are connected to a high voltage generator 15 having a voltage of 30 kV and a current amount of up to 1 mA, for example, and the container 11 is charged positively and the mold 13 is negatively charged. When the high voltage at which electrospinning occurs is reached, the polymer solution positively charged through the container 11 exits from the solution outlet 11a of the container 11 to form, for example, a conical droplet. As shown by the flight line 16, it flows out toward the entire surface of the flat mold surface 14 of the negatively charged mold body 13 and adheres to the flat mold surface 14. However, as long as the polymer solution and charging continue, in other words, until the desired thickness is reached, the fiberized polymer is deposited into a nonwoven fabric to form a flat diaphragm.

ここで不織布として形成された平板状の振動板は、必要に応じプレス成型あるいは加熱成型を行って密度や形状の調整、部品間結合が図られる。上面から見た形状つまり外形については、平板状振動板には長方形、楕円形、トラック形のものが含まれるが、型体１３のマイナスまたはプラス帯電をこれらのうち所望の形状の部分に対してのみ行うか、型体１３の外形そのものを所望の形状として全体を帯電させれば、所望の外形を有する振動板を形成することができる。ポリマー溶液の容器１１と型体１３の帯電極性は互いに逆極性であれば良く、一方をプラスにすれば他方はマイナスとすることは言うまでもない。 Here, the flat diaphragm formed as a non-woven fabric is press-molded or heat-molded as necessary to adjust the density and shape and to connect the parts. Regarding the shape or outer shape viewed from above, the flat diaphragm includes rectangular, elliptical, and track-shaped ones, but the negative or positive charging of the mold 13 is applied to the portion of the desired shape. If the entire outer shape of the mold 13 is charged as a desired shape, the diaphragm having the desired outer shape can be formed. The charged polarities of the polymer solution container 11 and the mold 13 need only be opposite to each other. It goes without saying that if one is positive, the other is negative.

上記はエレクトロスピニング法の典型として、溶液出口１１ａにおけるポリマー溶液の円錐形液滴の形成によるポリマー溶液の繊維化飛散と結果的な不織布の形成を記載するものであるが、本発明はこのような不織布形成の態様に限定されない。すなわち、溶液出口における液滴の形状は、ポリマー溶液容器と型体間、つまり電極間の印加電圧や電極間距離、ポリマー溶液に使用した溶剤の乾燥速度等の各種条件が変われば円錐形とはならず、たとえば電圧が所定値より低いとき、電極間距離が近いとき、溶剤乾燥速度が遅いとき等にはほぼ球形の滴状となり、その場合にはポリマー溶液は繊維化せず、滴化されて飛散するため、型体上に形成される成形体もフィルム状物質、あるいは不織布とフィルム状物質の中間体となることが知られている。従って電気音響変換器用振動系の所望部品に適した成形体の種類に応じて、エレクトロスピニング法の施行条件を適切に選択すれば、所望の種類の成形体が得られる。 Although the above describes the electrospinning method as a typical example, the fiber dispersion of the polymer solution by the formation of conical droplets of the polymer solution at the solution outlet 11a and the formation of the resulting nonwoven fabric are described. It is not limited to the aspect of nonwoven fabric formation. That is, the shape of the liquid droplet at the solution outlet is a cone shape if various conditions such as the applied voltage between the polymer solution container and the mold, that is, the applied voltage between the electrodes, the distance between the electrodes, and the drying speed of the solvent used in the polymer solution change. For example, when the voltage is lower than a predetermined value, when the distance between the electrodes is short, when the solvent drying speed is slow, etc., the droplets are almost spherical, and in this case, the polymer solution is not made into fibers but is made into drops. Therefore, it is known that the molded body formed on the mold body is also a film-like substance or an intermediate between the nonwoven fabric and the film-like substance. Accordingly, a desired type of molded body can be obtained by appropriately selecting the conditions for the electrospinning method according to the type of molded body suitable for the desired part of the vibration system for the electroacoustic transducer.

上記実施例１は１種類のポリマー溶液による単層構造の成形体の製造を記載するが、本発明は単層構造のものに限定されない。すなわち、第１の組成のポリマー溶液による所定の厚さまでの堆積を完了した後、第２の組成のポリマー溶液を収容する容器を用意して以後の工程を反復して行えば、組成の異なるポリマーによる２層構造の成形体が得られる。同様にして所望数の異なるポリマー溶液による堆積を繰り返して行えば、多層構造の成形体が得られる。 Although Example 1 above describes the production of a single layer structured article with one polymer solution, the present invention is not limited to a single layer structure. That is, after the deposition to the predetermined thickness by the polymer solution of the first composition is completed, if the container containing the polymer solution of the second composition is prepared and the subsequent steps are repeated, polymers having different compositions will be obtained. A two-layered molded product is obtained. Similarly, by repeatedly depositing with a desired number of different polymer solutions, a multilayer structure can be obtained.

また、例えば２層構造とする時、第１のポリマー溶液の繊維化ないし滴化と堆積を、第２のポリマー溶液の繊維化ないし滴化と堆積に徐々に切り替えることによって、傾斜構造を持った成形体とすることができる。同様にして、第１と第２のポリマー溶液を密度を変えた同一のものとし、これら溶液の堆積を徐々に切り替えれば、傾斜密度を持った成形体が得られる。 For example, when a two-layer structure is used, the first polymer solution has a gradient structure by gradually switching the fiberization or dropletization and deposition of the first polymer solution to the fiberization or dropletization and deposition of the second polymer solution. It can be set as a molded body. Similarly, if the first and second polymer solutions are the same with different densities and the deposition of these solutions is gradually switched, a molded body having a gradient density can be obtained.

また、形成する部品の特定部分を他の部分とは異なる組成のポリマー溶液によるものとすることを要する場合には、型体１３の特定部分はポリマー溶液と同じ極性に帯電し、他の部分を逆の極性に帯電して第１の組成のポリマー溶液によりエレクトロスピニングを行えば、特定部分の型体には同極性に帯電した繊維化ポリマーは付着しない。したがって他部に対する第１のポリマー溶液によるエレクトロスピニングの終了後、特定部分の帯電をポリマー溶液と逆極性に切り換え、他部の帯電を同極性に切り換えて、第２の組成を有するポリマー溶液によるエレクトロスピニングを行えば良い。この際、型体の特定部分と他部の帯電極性はそのままとし、第２のポリマー溶液の帯電を切り換えてエレクトロスピニングを行うこともできる。 In addition, when it is necessary to make a specific part of the part to be formed by a polymer solution having a composition different from that of the other part, the specific part of the mold 13 is charged with the same polarity as the polymer solution, and the other part is If the electrospinning is performed with the polymer solution having the first composition with the opposite polarity, the fiberized polymer charged with the same polarity does not adhere to the mold of the specific portion. Therefore, after the electrospinning with the first polymer solution for the other part is completed, the charging of the specific part is switched to the opposite polarity to the polymer solution, the charging of the other part is switched to the same polarity, and the electrolysis with the polymer solution having the second composition is performed. Spinning is enough. At this time, the electrospinning can be performed by switching the charging of the second polymer solution while keeping the charging polarity of the specific part and the other part of the mold as they are.

さらに、本発明の方法は、同一のポリマー溶液のエレクトロスピニングにより形成する部品の特定部分について他の部分とは厚さを変えることも可能とする。その場合も、型体１３の特定部分は先ずポリマー溶液と同極性に帯電させ、ポリマー溶液と逆極性に帯電させた他の部分のみに対して第１の厚さまでの堆積を行い、次いで特定部分の帯電をポリマー溶液と逆極性に切り替えて第２の厚さまでの堆積を同一のポリマー溶液によって行えば良い。その際、他の部分の帯電極性を逆極性のままとしておけば、他の部分上の第１の厚さに第２の厚さの堆積が加算されることになるが、ポリマー溶液と同極性に切り替えれば第１の厚さが保たれる。 Furthermore, the method of the present invention also allows the thickness of certain parts of the part formed by electrospinning of the same polymer solution to vary from the other parts. Even in this case, the specific portion of the mold 13 is first charged to the same polarity as the polymer solution, and only the other portion charged to the opposite polarity to the polymer solution is deposited to the first thickness, and then the specific portion. The charging up to the second thickness may be performed with the same polymer solution by switching the charging of the first to the opposite polarity to the polymer solution. At that time, if the charged polarity of the other part is kept opposite, the deposition of the second thickness is added to the first thickness on the other part. The first thickness is maintained by switching to.

図２は本発明の第２の実施例を示す。この実施例２が実施例１と異なるのは、型体２３として表面に凹形型面２４を有する金型を用いる点のみである。他の部分は実施例１と同じである。図２において、凹形型面２４は一例として、中央に円形のドーム部を有し、その周囲に環状の膨出部を持つ円形の振動板の内側の表面形状を備える。エレクトロスピニング法は実施例１の場合と全く同様にして行われる。 FIG. 2 shows a second embodiment of the present invention. The second embodiment is different from the first embodiment only in that a mold having a concave mold surface 24 on the surface is used as the mold body 23. Other parts to be the same as that of Example 1. In FIG. 2, as an example, the concave mold surface 24 has a circular dome portion at the center and a surface shape inside a circular diaphragm having an annular bulge portion around the dome portion. The electrospinning method is performed in exactly the same manner as in Example 1.

図３は本発明の第３の実施例を示し、この実施例３が実施例１と異なるのは、型体３３として、例えば実施例２と同じ円形振動板の外側の表面形状でなる凸形型面３４を有するとともに、円形振動板の中央ドーム部と環状膨出部との間の円形の接合部分に、結合他部品３８の例として予め形成してある円筒形ボイスコイルを挿入する円筒溝でなるインサート部３７を有する点であるが、他の部分は実施例１と同じである。この配列において、ボイスコイル上端を凸形型面３４とほぼ面一に配置して実施例１と同様にエレクトロスピニング法を行なえば、凸形型面３４上に付着する繊維化ポリマーはボイスコイル上端にも同時に付着し、堆積するから、ボイスコイルは振動板の所定位置に対して、振動板の形成と同時に、一体に結合される。

FIG. 3 shows a third embodiment of the present invention. The third embodiment is different from the first embodiment in that the mold 33 has, for example, a convex shape having the same outer surface shape as the circular diaphragm as in the second embodiment. A cylindrical groove having a mold surface 34 and inserting a cylindrical voice coil, which is formed in advance as an example of the coupling other part 38, into a circular joint portion between the central dome portion and the annular bulge portion of the circular diaphragm in that an insert portion 37 made of, other parts to be the same as that of example 1. In this arrangement, if the upper end of the voice coil is disposed substantially flush with the convex mold surface 34 and electrospinning is performed in the same manner as in the first embodiment, the fiberized polymer adhering to the convex mold surface 34 will be the upper end of the voice coil. At the same time, the voice coil is deposited and deposited, so that the voice coil is integrally coupled to a predetermined position of the diaphragm simultaneously with the formation of the diaphragm.

上記した各実施例を通じて、電気音響変換器用振動系部品の例として振動板の製造についてのみ記載したが、エッジ、ダンパー、制動材、ボイスコイルボビン等の他の部品についてもそれぞれに必要な表面形状を持つ型体を選択し、夫々が求める物性に応じて組成の異なるポリマー溶液を選択して、記載した工程に沿ってエレクトロスピニング法を行えば所望の振動系部品が容易に得られることは理解されよう。 Although only the manufacture of the diaphragm was described as an example of the vibration system part for the electroacoustic transducer through each of the above-described embodiments, the surface shape required for each of other parts such as an edge, a damper, a braking material, and a voice coil bobbin is also provided. It is understood that the desired vibration system parts can be easily obtained by selecting the molds to be held, selecting polymer solutions having different compositions according to the physical properties required, and performing the electrospinning method according to the described steps. Like.

使用するポリマー溶液には、限定はされないが、ケブラー（商標名）、ノーメックス（商標名）、ナイロン（商標名）、ポリフェニレンベンゾイミダゾール（ＰＢＩ）、ＰＥＴ、ＰＥＮ、ＰＬＡ、ポリウレタン、ＰＶＡ、ＰＡＮ、ＰＣＬ、ＰＥＯ、ＰＭＭＡ、ＰＳ、ＰＣ、ＰＥＩ、ＰＩ、ＳＢＳ、熱可塑性エラストマーが含まれる。 The polymer solution used is not limited, but Kevlar (trade name), Nomex (trade name), nylon (trade name), polyphenylenebenzimidazole (PBI), PET, PEN, PLA, polyurethane, PVA, PAN, PCL , PEO, PMMA, PS, PC, PEI, PI, SBS, thermoplastic elastomer.

ポリマー溶液に添加し得る無機フィラーには、限定はされないが、上記ポリマー溶液に分散可能なフィラー、カーボンナノチューブ、カーボンファイバー、カーボンブラック、炭酸カルシウム、酸化チタン、酸化アルミニウム、クレー、モンモリロナイトが含まれる。 Inorganic fillers that can be added to the polymer solution include, but are not limited to, fillers that can be dispersed in the polymer solution, carbon nanotubes, carbon fibers, carbon black, calcium carbonate, titanium oxide, aluminum oxide, clay, and montmorillonite.

ポリマー溶液作成用の溶媒としては、例えばギ酸、硫酸、クロロフォルム、ヘキサフロロイソプロパノール（ＨＦＩＰ）、ギ酸とクロロフォルムの混合液、クロロフォルムとＤＭＦの混合液、クロロフォルムとアセトンの混合液、ジクロロメタンとトリフルオロ酢酸の混合液等が挙げられる。 Examples of the solvent for preparing the polymer solution include formic acid, sulfuric acid, chloroform, hexafluoroisopropanol (HFIP), a mixture of formic acid and chloroform, a mixture of chloroform and DMF, a mixture of chloroform and acetone, dichloromethane and trifluoroacetic acid. A mixed liquid etc. are mentioned.

本発明による電気音響変換器用振動系部品の製造方法の実施例１における配置を略図的に示す図The figure which shows schematically arrangement | positioning in Example 1 of the manufacturing method of the vibration system components for electroacoustic transducers by this invention. 本発明による電気音響変換器用振動系部品の製造方法の実施例２における配置を略図的に示す図The figure which shows schematically arrangement | positioning in Example 2 of the manufacturing method of the vibration system components for electroacoustic transducers by this invention. 本発明による電気音響変換器用振動系部品の製造方法の実施例３における配置を略図的に示す図The figure which shows schematically arrangement | positioning in Example 3 of the manufacturing method of the vibration system components for electroacoustic transducers by this invention.

Explanation of symbols

１１、２１、３１容器
１１ａ、２１ａ、３１ａ溶液出口
１２、２２、３２液滴先端
１３、２３、３３型体
１４平坦型面
１５、２５、３５高電圧発生器
１６、２６、３６繊維化ポリマーの飛行線
２４凹形型面
３４凸形型面
３７インサート部
３８結合他部材 11, 21, 31 Container 11a, 21a, 31a Solution outlet 12, 22, 32 Droplet tip 13, 23, 33 Mold body 14 Flat mold surface 15, 25, 35 High voltage generator 16, 26, 36 of fiberized polymer Flight line 24 Concave mold surface 34 Convex mold surface 37 Insert portion 38 Other member

Claims

Prepare a container containing a polymer solution for manufacturing a desired part of a vibration system for an electroacoustic transducer and having a solution outlet, and face a mold having a desired surface shape of the desired part to the solution outlet of the polymer solution container The polymer formed into fibers or drops from the tip of the solution outlet is formed by applying a plus or minus high voltage to the polymer solution and charging the desired surface shape part of the die to minus or plus. Of a vibration system part for an electroacoustic transducer having a desired shape of a molded body formed with a desired surface shape and a desired thickness by an electrospinning method. In the manufacturing method,
As the polymer solution, a plurality of types of polymer solutions are prepared, and after the first polymer solution that has been made into fibers or drops is deposited on a negatively or positively charged mold body to a predetermined thickness, the composition is gradually increased. A method for producing a vibration-system component for an electroacoustic transducer, wherein the molded product to be produced has an inclined structure by switching to deposition with a second polymer solution having a different value.

Prepare a container containing a polymer solution for manufacturing a desired part of a vibration system for an electroacoustic transducer and having a solution outlet, and face a mold having a desired surface shape of the desired part to the solution outlet of the polymer solution container The polymer formed into fibers or drops from the tip of the solution outlet is formed by applying a plus or minus high voltage to the polymer solution and charging the desired surface shape part of the die to minus or plus. Of a vibration system part for an electroacoustic transducer having a desired shape of a molded body formed with a desired surface shape and a desired thickness by an electrospinning method. In the manufacturing method,
Manufactured by depositing a polymer solution that has been fiberized or dropped onto a negatively or positively charged mold to a predetermined thickness and then gradually switching to deposition with the same polymer solution having a different density. A method for producing a vibration system component for an electroacoustic transducer, wherein the molded body has a gradient density.

Prepare a container containing a polymer solution for manufacturing a desired part of a vibration system for an electroacoustic transducer and having a solution outlet, and face a mold having a desired surface shape of the desired part to the solution outlet of the polymer solution container The polymer formed into fibers or drops from the tip of the solution outlet is formed by applying a plus or minus high voltage to the polymer solution and charging the desired surface shape part of the die to minus or plus. Of a vibration system part for an electroacoustic transducer having a desired shape of a molded body formed with a desired surface shape and a desired thickness by an electrospinning method. In the manufacturing method,
The step of negatively or positively charging the desired surface shape portion of the mold includes the step of positively or negatively charging a specific portion of the surface shape portion, and the first polymer solution on the negative or positively charged portion is charged. Subsequent to the fiberization or droplet deposition step, the method includes a step of charging a specific portion that is positively or negatively charged again to negative or positive to fiberize or dropletize and deposit a second polymer solution having a different composition. method of manufacturing to that electric acoustic converter vibration system part characterized.

Prepare a container containing a polymer solution for manufacturing a desired part of a vibration system for an electroacoustic transducer and having a solution outlet, and face a mold having a desired surface shape of the desired part to the solution outlet of the polymer solution container The polymer formed into fibers or drops from the tip of the solution outlet is formed by applying a plus or minus high voltage to the polymer solution and charging the desired surface shape part of the die to minus or plus. Of a vibration system part for an electroacoustic transducer having a desired shape of a molded body formed with a desired surface shape and a desired thickness by an electrospinning method. In the manufacturing method,
The step of negatively or positively charging a desired surface shape portion of the mold includes a step of charging a specific portion of the surface shape portion positively or negatively, up to a first predetermined thickness on the negative or positively charged portion. And a step of depositing a specific portion that has been positively or negatively charged again to be negatively or positively and performing deposition to a second predetermined thickness with the same polymer solution. that electrical acoustic converter vibration system manufacturing method of the parts to.

Prepare a container containing a polymer solution for manufacturing a desired part of a vibration system for an electroacoustic transducer and having a solution outlet, and face a mold having a desired surface shape of the desired part to the solution outlet of the polymer solution container The polymer formed into fibers or drops from the tip of the solution outlet is formed by applying a plus or minus high voltage to the polymer solution and charging the desired surface shape part of the die to minus or plus. In the vibration system part for an electroacoustic transducer, which is a molded body having a desired surface shape and a predetermined thickness formed by an electrospinning method through each step of depositing a desired thickness on a desired surface shape portion of
By depositing the first polymer solution that has been fiberized or dropped into a negatively or positively charged mold body to a predetermined thickness and then gradually switching to deposition with a second polymer solution having a different composition A vibration system part for an electroacoustic transducer, characterized in that the molded body to be manufactured has an inclined structure.

Prepare a container containing a polymer solution for manufacturing a desired part of a vibration system for an electroacoustic transducer and having a solution outlet, and face a mold having a desired surface shape of the desired part to the solution outlet of the polymer solution container The polymer formed into fibers or drops from the tip of the solution outlet is formed by applying a plus or minus high voltage to the polymer solution and charging the desired surface shape part of the die to minus or plus. In the vibration system part for an electroacoustic transducer, which is a molded body having a desired surface shape and a predetermined thickness formed by an electrospinning method through each step of depositing a desired thickness on a desired surface shape portion of
Manufactured by depositing a polymer solution that has been fiberized or dropped onto a negatively or positively charged mold to a predetermined thickness and then gradually switching to deposition with the same polymer solution having a different density. it characterized in that to have a gradient density molded body electrical acoustic converter vibration system part.

Prepare a container containing a polymer solution for manufacturing a desired part of a vibration system for an electroacoustic transducer and having a solution outlet, and face a mold having a desired surface shape of the desired part to the solution outlet of the polymer solution container The polymer formed into fibers or drops from the tip of the solution outlet is formed by applying a plus or minus high voltage to the polymer solution and charging the desired surface shape part of the die to minus or plus. In the vibration system part for an electroacoustic transducer, which is a molded body having a desired surface shape and a predetermined thickness formed by an electrospinning method through each step of depositing a desired thickness on a desired surface shape portion of
The step of negatively or positively charging the desired surface shape portion of the mold includes the step of positively or negatively charging a specific portion of the surface shape portion, and the first polymer solution on the negative or positively charged portion is charged. Subsequent to the fiberization or droplet deposition step, a step of charging a specific portion that is positively or negatively charged again to negative or positive to fiberize or dropletize and deposit a second polymer solution having a different composition is included. it characterized by comprising in the formed molded body electrical acoustic converter vibration system part.

Prepare a container containing a polymer solution for manufacturing a desired part of a vibration system for an electroacoustic transducer and having a solution outlet, and face a mold having a desired surface shape of the desired part to the solution outlet of the polymer solution container The polymer formed into fibers or drops from the tip of the solution outlet is formed by applying a plus or minus high voltage to the polymer solution and charging the desired surface shape part of the die to minus or plus. In the vibration system part for an electroacoustic transducer, which is a molded body having a desired surface shape and a predetermined thickness formed by an electrospinning method through each step of depositing a desired thickness on a desired surface shape portion of
The step of negatively or positively charging a desired surface shape portion of the mold includes a step of charging a specific portion of the surface shape portion positively or negatively, up to a first predetermined thickness on the negative or positively charged portion. Subsequent to the polymer solution deposition step, a specific portion that is positively or negatively charged is charged again negatively or positively, and deposition is performed to the second predetermined thickness with the same polymer solution. it characterized by comprising a molded body electrical acoustic converter vibration system part.