JP2006311317A - Speaker, diaphragm for speaker and method for manufacturing diaphragm for speaker - Google Patents

Speaker, diaphragm for speaker and method for manufacturing diaphragm for speaker Download PDF

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JP2006311317A
JP2006311317A JP2005132733A JP2005132733A JP2006311317A JP 2006311317 A JP2006311317 A JP 2006311317A JP 2005132733 A JP2005132733 A JP 2005132733A JP 2005132733 A JP2005132733 A JP 2005132733A JP 2006311317 A JP2006311317 A JP 2006311317A
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diaphragm
edge
main body
resin
diaphragm main
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JP3940151B2 (en
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Kiyohisa Nara
良 精 久 奈
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Minebea Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker which has excellent sound quality and high production efficiency and whose cost can be reduced. <P>SOLUTION: The speaker is provided with a magnetic circuit 5 having a pot type yoke that also serves as a frame, a magnet 3 and a disk-like pole plate 4, a diaphragm main body 7 with a voice coil 6 supported in a magnetic gap of the magnetic circuit 5 arranged under a curved part, and an edge 8 connected to an outer circumferential edge part of the diaphragm main body 7. The diaphragm main body 7 and the edge 8 are directly connected by thermo-compression bonding without the intermediation of an adhesive member to form a diaphragm 9. Since the diaphragm main body 7 and the edge 8 are directly connected, the diaphragm main body 7 and the edge 8 do not have to be connected by an adhesive to be able improve productivity because adhesive applying process and curing/drying process that conventionally require time and effort can be omitted. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、振動板本体の外周縁部にエッジが取り付けられるフリーエッジタイプのスピーカ、スピーカ用振動板およびスピーカ用振動板の製造方法に関する。   The present invention relates to a free edge type speaker in which an edge is attached to an outer peripheral edge of a diaphragm main body, a speaker diaphragm, and a method for manufacturing the speaker diaphragm.

スピーカは、オーディオ機器だけでなく、パーソナルコンピュータ（以下、パソコン）や携帯電話、ゲーム機器などの種々の電子機器にも幅広く利用されており、小型であっても音質に優れたスピーカを求める声が高い。また、電子機器は、部品コストをできる限り抑える必要があり、安価で高音質のスピーカの開発が望まれている。   Speakers are widely used not only for audio equipment but also for various electronic devices such as personal computers (hereinafter referred to as personal computers), mobile phones and game machines. high. In addition, electronic equipment needs to keep component costs as low as possible, and development of inexpensive and high-quality speakers is desired.

現在市販されているスピーカは、振動板に着目して分類すると、振動板本体とエッジが同一材質で一体に形成された振動板を有するフィックストエッジタイプと、振動板本体とエッジが別個に作製されてこれらを接合して振動板が形成されるフリーエッジタイプとに分けられる。   The loudspeakers currently on the market can be classified by focusing on the diaphragm. The fixed-edge type has a diaphragm in which the diaphragm body and the edge are integrally formed of the same material, and the diaphragm body and the edge are separately manufactured. Then, these are joined to a free edge type in which a diaphragm is formed.

小型薄型化の要求の高いマイクロスピーカ等では、コスト低減のために、PET材等のフィルムを振動板に用いたフィックストエッジタイプを採用することが多い。これにより、振動板本体とエッジとの接着工程がなくなり、生産性の向上と低価格化を実現できる。   In order to reduce costs, micro-speakers and the like that are highly demanded to be small and thin often employ a fixed edge type using a film such as a PET material as a diaphragm. As a result, the bonding process between the diaphragm main body and the edge is eliminated, and the productivity can be improved and the price can be reduced.

しかしながら、振動板本体に求められる特性とエッジに求められる特性は本来異なるため、両特性を一種類の材料でカバーするのは困難である。例えば、最低共振周波数を低下させるためにフィルムの厚さを薄くすると、振動板本体としての剛性が低下して異常共振が発生してしまう。また、異常共振が発生しないようにフィルムの厚みを厚くすると、エッジ部分での剛性が高くなり、最低共振周波数が高くなるという問題が生じる。このように、フィックストエッジタイプのスピーカでは、小型、高信頼性かつ高音質のすべてを満足させるのは難しい。   However, since the characteristics required for the diaphragm main body and the characteristics required for the edge are inherently different, it is difficult to cover both characteristics with one kind of material. For example, if the thickness of the film is reduced in order to reduce the minimum resonance frequency, the rigidity of the diaphragm main body is reduced and abnormal resonance occurs. Further, if the thickness of the film is increased so as not to cause abnormal resonance, there is a problem that the rigidity at the edge portion is increased and the minimum resonance frequency is increased. As described above, it is difficult for a fixed edge type speaker to satisfy all of small size, high reliability, and high sound quality.

一方、フリーエッジタイプでは、異常共振が発生しない程度の剛性を有する材料を用いた振動板本体と、最低共振周波数を下げるためにスティフネスの低い材料を用いたエッジとを用いて音質の向上を図っている。フリーエッジタイプでは、通常、振動板本体とエッジに異種材料を用いるが、異種材料での一体成形は異種材料間の成形条件を確立するのが難しく、成形設備も複雑になることから、一般には、振動板本体とエッジを別個に成形し、その後、両者を接着剤を介して固定する。このため、接着剤の塗布、振動板本体とエッジとの貼り合わせ、接着剤の硬化・乾燥といった種々の接着に関わる工程が必要となり、生産性が低下し、製造コストも増大するという問題がある。   On the other hand, in the free edge type, the sound quality is improved by using a diaphragm body made of a material having rigidity that does not cause abnormal resonance and an edge made of a material having low stiffness to lower the minimum resonance frequency. ing. In the free edge type, different types of materials are usually used for the diaphragm body and the edge. However, it is difficult to establish molding conditions between different types of materials, and the molding equipment becomes complicated. The diaphragm main body and the edge are separately formed, and then both are fixed with an adhesive. For this reason, various processes related to adhesion such as application of adhesive, bonding of the diaphragm main body and the edge, and curing / drying of the adhesive are required, which causes a problem that productivity is lowered and manufacturing cost is increased. .

このような問題を解決するために、フリーエッジタイプを採用しながら、工程の簡略化を図ってコストダウンを可能とする手法が提案されている（特許文献１の請求項１、段落0007および0014参照）。
特開平6-189392号公報 In order to solve such a problem, there has been proposed a technique capable of reducing the cost by adopting a free edge type while simplifying the process (claim 1, paragraph 0007 and 0014 of Patent Document 1). reference).
JP-A-6-189392

上記特許文献１では、連続気泡性軟質ポリウレタンフォームからなるシート状部材で形成されたエッジの片面全体に、加熱時に接着性を有する熱可塑性樹脂を直接塗布して樹脂層を形成し、振動板本体を樹脂層に重ねて加熱加圧することで、接着工程とエッジ成形工程とを同時に行っている。   In the above-mentioned Patent Document 1, a resin layer is formed by directly applying a thermoplastic resin having adhesiveness during heating to the entire one surface of an edge formed of a sheet-like member made of open-celled flexible polyurethane foam. Is laminated on the resin layer and heated and pressed to simultaneously perform the bonding step and the edge molding step.

しかしながら、エッジの振動板本体との接合面に接着剤を塗布する作業は、スピーカの小型化に伴って、エッジ径が小さくなるほど、また、エッジの特性向上のためにスティフネスを下げようとしてエッジ材を薄くするほど不安定で困難な作業となり、生産性を上げることができない。   However, the work of applying adhesive to the joint surface of the edge with the diaphragm main body is an edge material as the edge diameter becomes smaller and the stiffness is lowered to improve the edge characteristics as the speaker becomes smaller. As the thickness is reduced, the work becomes unstable and difficult, and the productivity cannot be increased.

また、振動板本体とポリエステル系ウレタン樹脂を用いて形成されたエッジとを接合するために用いる接着剤として、ゴム系の接着剤を有機溶剤で溶かして使用すると、有機溶剤のウレタン樹脂への膨潤を避けるために塗布後に一定時間エージングを行う必要があり、リードタイムが長くなって、生産性向上が図れない。   In addition, as an adhesive used to join the diaphragm body and the edge formed using polyester urethane resin, if a rubber adhesive is dissolved in an organic solvent, the organic solvent swells into the urethane resin. In order to avoid this, it is necessary to perform aging for a certain time after coating, and the lead time becomes long, and the productivity cannot be improved.

さらに、上記特許文献１では、ウレタン樹脂のエッジを使用するため、音質を向上できるが、振動板本体とエッジとの貼り合わせの事前作業として、エッジの材料であるポリウレタンフォームの表面に直接熱可塑性樹脂を塗布して樹脂層を形成する工程が必要となり、上述したように生産性向上の妨げになる。   Furthermore, in the above-mentioned Patent Document 1, since the edge of the urethane resin is used, the sound quality can be improved. However, as a preliminary work for bonding the diaphragm main body and the edge, thermoplasticity is directly applied to the surface of the polyurethane foam which is the material of the edge. A step of forming a resin layer by applying a resin is required, which hinders productivity improvement as described above.

本発明は、上記の問題点に鑑みてなされたものであり、その目的は、音質に優れ、生産効率のよく、コストダウンが可能なスピーカ、スピーカ用振動板およびスピーカ用振動板の製造方法を提供することにある。   The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a speaker, a speaker diaphragm, and a speaker diaphragm manufacturing method that have excellent sound quality, high production efficiency, and low cost. It is to provide.

上記の課題を解決するために、本発明の一態様によれば、磁気回路と、前記磁気回路の磁気ギャップ中に支持されるボイスコイルを有する振動板本体と、前記振動板本体の外周縁部に、接着部材を介することなく熱圧着により直接接合されるエッジと、を備え、前記振動板本体は、パルプと、第１の樹脂と、合成ゴムラテックスとを用いて形成され、前記エッジは、第２の樹脂を用いて形成されることを特徴とするスピーカが提供される。   In order to solve the above problems, according to one aspect of the present invention, a magnetic circuit, a diaphragm main body having a voice coil supported in a magnetic gap of the magnetic circuit, and an outer peripheral edge portion of the diaphragm main body And an edge that is directly joined by thermocompression bonding without using an adhesive member, and the diaphragm main body is formed using pulp, a first resin, and a synthetic rubber latex, A speaker characterized by being formed using a second resin is provided.

また、本発明の一態様によれば、パルプと、第１の樹脂と、合成ゴムラテックスとを用いて形成される振動板本体と、前記振動板本体の外周縁部に、接着部材を介することなく熱圧着により直接接合され、第２の樹脂を用いて形成されるエッジと、を備えることを特徴とするスピーカ用振動板が提供される。   Moreover, according to one aspect of the present invention, the diaphragm main body formed using pulp, the first resin, and the synthetic rubber latex, and the outer peripheral edge of the diaphragm main body are provided with an adhesive member. There is provided a diaphragm for a speaker, which is directly joined by thermocompression bonding and has an edge formed using a second resin.

さらに、本発明の一態様によれば、叩解されたパルプと、粉末状の第１の樹脂と、液体状の合成ゴムラテックスとを混合した混合物をシート状に引き延ばす工程と、前記シート状に引き延ばした混合物を加熱加圧してボディ成形を行い、その後に外径抜きを行って振動板本体を形成する工程と、第２の樹脂を加熱加圧してボディ成形を行い、その後に内径抜きを行ってエッジを形成する工程と、前記振動板本体の外周縁部に、接着部材を介することなく熱圧着により前記エッジを直接接合して振動板を形成する工程と、を備えることを特徴とするスピーカ用振動板の製造方法が提供される。   Furthermore, according to one aspect of the present invention, a step of stretching a mixture of beaten pulp, powdered first resin, and liquid synthetic rubber latex into a sheet, and stretching into the sheet The mixture is heated and pressurized to form the body, and then the outer diameter is removed to form the diaphragm main body. The second resin is heated and pressurized to form the body, and then the inner diameter is removed. A speaker comprising: a step of forming an edge; and a step of directly bonding the edge to the outer peripheral edge of the diaphragm main body by thermocompression bonding without an adhesive member to form the diaphragm. A method for manufacturing a diaphragm is provided.

本発明は、振動板本体とエッジを熱圧着により直接接合するため、事前に接着部材を塗布する工程が不要となり、生産性の向上が図れる。また、振動板本体とエッジを別個の材料で形成するため、振動板本体に最適な材料とエッジに最適な材料を選択でき、音質の向上が図れる。   In the present invention, since the diaphragm main body and the edge are directly joined by thermocompression bonding, a step of applying an adhesive member in advance is not required, and productivity can be improved. In addition, since the diaphragm main body and the edge are formed of different materials, the optimum material for the diaphragm main body and the optimum material for the edge can be selected, and sound quality can be improved.

以下、図面を参照しながら、本発明の一実施形態について説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

図１は本発明の一実施形態によるスピーカの断面構造を示す図である。図１のスピーカは、いわゆる内磁型のスピーカ１であり、フレームを兼ねたポット型のヨーク２、マグネット３および円盤状のポールプレート４を有する磁気回路５と、この磁気回路５の磁気ギャップ中に支持されるボイスコイル６を屈曲部下方に配置した振動板本体７と、この振動板本体７の外周縁部に接合されるエッジ８とを備えている。後述するように、振動板本体７とエッジ８とは、接着部材を介することなく熱圧着により直接接合されて振動板９が形成される。   FIG. 1 is a diagram showing a cross-sectional structure of a speaker according to an embodiment of the present invention. The speaker shown in FIG. 1 is a so-called internal-magnet-type speaker 1, and includes a magnetic circuit 5 having a pot-type yoke 2, a magnet 3 and a disk-shaped pole plate 4 that also serves as a frame, and a magnetic gap in the magnetic circuit 5. A diaphragm main body 7 in which the voice coil 6 supported by the diaphragm is disposed below the bent portion and an edge 8 joined to the outer peripheral edge of the diaphragm main body 7 are provided. As will be described later, the diaphragm main body 7 and the edge 8 are directly joined by thermocompression bonding without using an adhesive member to form the diaphragm 9.

図２は図１の振動板９の接合部分の拡大図である。ドーム型の振動板本体７にエッジ８が直接接合されている。   FIG. 2 is an enlarged view of a joint portion of the diaphragm 9 of FIG. An edge 8 is directly joined to the dome-shaped diaphragm main body 7.

以下、口径16mmφのマイクロスピーカに用いられる振動板９の一例を説明する。本実施形態の振動板９は、互いに異なる材料で形成された振動板本体７とエッジ８を有する。振動板９を製造する工程は、（１）振動板本体７の製造工程、（２）エッジ８の製造工程、（３）振動板本体７とエッジ８との一体化工程の３つに分かれる。   Hereinafter, an example of the diaphragm 9 used for a micro speaker having a diameter of 16 mmφ will be described. The diaphragm 9 of the present embodiment has a diaphragm body 7 and an edge 8 formed of different materials. The process of manufacturing the diaphragm 9 is divided into three processes: (1) a manufacturing process of the diaphragm main body 7, (2) a manufacturing process of the edge 8, and (3) an integration process of the diaphragm main body 7 and the edge 8.

図３はこれら３つの工程の手順を示す図である。以下、図３を参照して、上記３つの工程を順に説明する。なお、（１）の工程と（２）の工程はどちらを先に行ってもよい。   FIG. 3 is a diagram showing the procedure of these three steps. Hereinafter, with reference to FIG. 3, the three steps will be described in order. Note that either the step (1) or the step (2) may be performed first.

（１）振動板本体７の製造工程
振動板本体７は、パルプと、第１の樹脂（例えばポリオレフィン樹脂）と、合成ゴムラテックスとを用いて形成される。以下では、第１の樹脂として、ポリオレフィン樹脂の一種であるポリエチレン樹脂を用いる例について説明する。 (1) Manufacturing process of diaphragm main body 7 The diaphragm main body 7 is formed using pulp, a first resin (for example, polyolefin resin), and synthetic rubber latex. Below, the example which uses the polyethylene resin which is 1 type of polyolefin resin as 1st resin is demonstrated.

まず、第１工程では、パルプを叩解して繊維状にする（ステップＳ１）。次に、第２工程では、叩解したパルプと、ポリエチレン樹脂の粉末とを混ぜ合わせて分散させる（ステップＳ２）。   First, in a 1st process, a pulp is beaten and it makes it fibrous (step S1). Next, in the second step, the beaten pulp and the polyethylene resin powder are mixed and dispersed (step S2).

次に、第３工程では、第２工程にて生成した混合材料に、液体状の合成ゴムラテックスを混ぜ合わせて、100〜200μm程度の厚さになるようにシート状に引き延ばす（ステップＳ３）。次に、最後の第４工程では、第３工程でシート状に引き延ばしたシート状材料を加熱成形機にセットして、140〜160℃の温度下でボディ成形をした後、プレス機でボディの外径抜きを行い、最終形状の振動板本体７を得る（ステップＳ４）。   Next, in the third step, a liquid synthetic rubber latex is mixed with the mixed material produced in the second step, and the mixture is stretched into a sheet shape so as to have a thickness of about 100 to 200 μm (step S3). Next, in the final fourth step, the sheet-like material stretched into a sheet shape in the third step is set in a heating molding machine, and body molding is performed at a temperature of 140 to 160 ° C. The outer diameter is removed to obtain a final diaphragm body 7 (step S4).

第２の工程で用いたポリエチレン樹脂は、第４の工程で印加する熱で溶融流動し、パルプ間の隙間を効率よく埋めて振動板本体７の材料全体に気密性を持たせる役割を担う。   The polyethylene resin used in the second step melts and flows with the heat applied in the fourth step, and efficiently fills the gaps between the pulps to give the whole material of the diaphragm main body 7 hermeticity.

本発明者の実験によると、振動板本体７の全質量に占めるポリエチレン樹脂の質量比が約40％未満になると、成形後の振動板本体７におけるパルプの分布が均一にならず、弱い応力でも容易に振動板本体７が破れてしまう。逆に、ポリエチレン樹脂の質量比が約45％よりも多いと、成形後の振動板本体７は粗く分離した形態になり、紙としての形を保持できなくなる。したがって、ポリエチレン樹脂の質量比を所定範囲に設定することは非常に重要である。   According to the experiments of the present inventors, when the mass ratio of the polyethylene resin to the total mass of the diaphragm main body 7 is less than about 40%, the pulp distribution in the diaphragm main body 7 after molding is not uniform, even with a weak stress. The diaphragm main body 7 is easily broken. On the other hand, when the mass ratio of the polyethylene resin is more than about 45%, the molded diaphragm main body 7 is roughly separated and cannot retain its shape as paper. Therefore, it is very important to set the mass ratio of the polyethylene resin within a predetermined range.

第３工程で用いた合成ゴムラテックスは、第４工程で印加する熱により、パルプとポリエチレン樹脂の隙間に入り込み、両者を安定に接合する接着剤として機能する。仮に合成ゴムラテックスを用いないとすると、パルプとポリエチレン樹脂は接合しない。また、合成ゴムラテックスの振動板本体７の全質量に対する質量比が約10％より少ないと、成形後の振動板本体７の柔軟性がなくなりすぎてしまい、振動板９としては適さない。   The synthetic rubber latex used in the third step enters the gap between the pulp and the polyethylene resin by the heat applied in the fourth step, and functions as an adhesive that stably bonds both. If synthetic rubber latex is not used, pulp and polyethylene resin are not joined. If the mass ratio of the synthetic rubber latex to the total mass of the diaphragm main body 7 is less than about 10%, the flexibility of the diaphragm main body 7 after molding is lost, which is not suitable as the diaphragm 9.

第１および第２の工程で用いるパルプは、振動板本体７のベースとなる材料であり、本発明者の実験によると、ポリエチレン樹脂と同程度の質量比が必要である。パルプは一般に、主要パルプと補助パルプに分けられ、主要パルプとしては木材パルプが、補助パルプとしては木材パルプ（かすパルプ、故紙パルプ）、ぼろパルプ、茎かんパルプ、靱皮パルプなどがあるが、本実施形態ではどの種類のパルプでも用いることができる。   The pulp used in the first and second steps is a material that becomes the base of the diaphragm main body 7, and according to the experiments of the present inventor, a mass ratio comparable to that of polyethylene resin is required. Pulp is generally divided into main pulp and auxiliary pulp. The main pulp is wood pulp, and auxiliary pulp is wood pulp (dust pulp, waste paper pulp), rag pulp, stalk cane pulp, bast pulp, etc. In the embodiment, any kind of pulp can be used.

以上の事情に基づいて、本実施形態では、パルプ、ポリエチレン樹脂および合成ゴムテックスの振動板本体７の全質量に占める質量比を、パルプとポリエチレン樹脂はいずれも同程度（双方とも40〜45％）、合成ゴムラテックスは10〜20％に設定する。このような質量比に設定することにより、振動板本体７の加工時の成形性がよくなり、かつ形状の保持力の高い（型くずれのしない）振動板本体７が得られる。また、上記の質量比を採用することで、振動板本体７とエッジ８との一体化後に、両者間に強固な接合力を持たせることができる。   Based on the above circumstances, in this embodiment, the pulp and polyethylene resin have the same mass ratio in the total mass of the diaphragm main body 7 of pulp, polyethylene resin and synthetic rubber tex (both 40 to 45% in both cases). ), Synthetic rubber latex is set to 10-20%. By setting to such a mass ratio, the formability at the time of processing of the diaphragm main body 7 is improved, and the diaphragm main body 7 having a high shape retention force (not deformed) can be obtained. Further, by adopting the above mass ratio, after the diaphragm body 7 and the edge 8 are integrated, a strong bonding force can be given between them.

一変形例として、上記の第１〜第４工程で製造された複数の振動板本体７同士を、上述した第４工程と同様の熱圧着にて互いに接合して一体化し、複数の振動板本体７を全体的にあるいは部分的に重ね合わせて剛性を高めた振動板本体７を製造してもよい。   As a modification, the plurality of diaphragm main bodies 7 manufactured in the first to fourth steps are joined together by thermocompression bonding similar to the fourth step described above, and the plurality of diaphragm main bodies are integrated. You may manufacture the diaphragm main body 7 which heightened rigidity by superimposing 7 entirely or partially.

また、振動板本体７を製造する際に用いる第１の樹脂は必ずしもポリエチレン樹脂でなくてもよいが、適切な樹脂を用いないと、ボディ成形時にパルプの隙間が分離して破れてしまい、成形自体が困難になる。上述したポリエチレン樹脂は、パルプ間の隙間を埋める材料として最適な材料の一つである。   In addition, the first resin used for manufacturing the diaphragm main body 7 may not necessarily be a polyethylene resin. However, if an appropriate resin is not used, the gap between the pulps is separated and torn during the body molding, and the molding is performed. It becomes difficult. The above-described polyethylene resin is one of the most suitable materials for filling the gaps between pulps.

なお、ポリエチレン樹脂以外に、ポリエーテル樹脂を用いてもよい。ポリエーテル樹脂はポリオレフィン樹脂ではないが、パルプ間の隙間を効率よく埋めることができる点では、ポリエチレン樹脂と同様であり、本実施形態の振動板本体７の材料として用いることができる。   In addition to the polyethylene resin, a polyether resin may be used. Although the polyether resin is not a polyolefin resin, it is the same as the polyethylene resin in that the gap between pulps can be efficiently filled, and can be used as the material of the diaphragm body 7 of the present embodiment.

（２）エッジ８の製造工程
エッジ８の製造工程では、約30〜100μmの厚さのポリエステル系ウレタン樹脂を含むシート状材料を加熱成形機にセットして、110℃でボディ成形をした後、プレス機にてエッジ８の内径抜きを行い、最終的なエッジ８を得る（ステップＳ５）。 (2) Manufacturing process of edge 8 In the manufacturing process of edge 8, a sheet-like material containing a polyester-based urethane resin having a thickness of about 30 to 100 μm is set in a thermoforming machine, and after body molding at 110 ° C., The inner diameter of the edge 8 is removed with a press machine to obtain the final edge 8 (step S5).

（３）振動板本体７とエッジ８の一体化工程
上述した２つの工程（ステップＳ１〜Ｓ５）が終了した後、振動板本体７とエッジ８の一体化工程が行われる。この工程では、上述した第１〜第４工程で製造した振動板本体７の外周縁部と、エッジ８の製造工程で製造されたエッジ８の内周縁部とを、接着部材を介することなく直接接合し、その接合部を加熱圧着機で熱圧着する。 (3) Integration Process of Diaphragm Body 7 and Edge 8 After the above-described two processes (Steps S1 to S5) are completed, an integration process of the diaphragm body 7 and the edge 8 is performed. In this step, the outer peripheral edge of the diaphragm body 7 manufactured in the first to fourth processes described above and the inner peripheral edge of the edge 8 manufactured in the manufacturing process of the edge 8 are directly connected without using an adhesive member. Bonding is performed, and the bonded portion is thermocompression bonded with a thermocompression bonding machine.

熱圧着時の温度は140〜160℃に設定する。これにより、振動板本体７を構成する合成ゴムラテックスが溶融して接着剤として機能し、振動板本体７の外周縁部とエッジ８の内周縁部は安定に接合固着されて、最終形態である振動板９が得られる（ステップＳ６）。振動板９は、図１のスピーカに用いられる。   The temperature during thermocompression bonding is set to 140 to 160 ° C. As a result, the synthetic rubber latex constituting the diaphragm main body 7 is melted and functions as an adhesive, and the outer peripheral edge of the diaphragm main body 7 and the inner peripheral edge of the edge 8 are stably bonded and fixed to form the final form. The diaphragm 9 is obtained (step S6). The diaphragm 9 is used for the speaker of FIG.

このように、本実施形態のスピーカは、振動板本体７とエッジ８を直接接合した振動板９を有するため、両者間を接着剤で接合しなくて済み、従来手間の掛かった接着剤の塗布工程や硬化・乾燥工程を省略できることから、生産性を向上できる。これにより、製造コストを削減でき、スピーカ自体のコストダウンも図れる。また、振動板本体７とエッジ８をそれぞれ別個の材料で形成できるため、振動板本体７に適した材料とエッジ８に適した材料とを任意に選択でき、音質の向上が図れる。   Thus, since the speaker of this embodiment has the diaphragm 9 which joined the diaphragm main body 7 and the edge 8 directly, it is not necessary to join between both with an adhesive agent, and the application | coating of the conventionally troublesome adhesive agent is unnecessary. Since the process and the curing / drying process can be omitted, productivity can be improved. Thereby, the manufacturing cost can be reduced and the cost of the speaker itself can be reduced. Moreover, since the diaphragm main body 7 and the edge 8 can be formed of separate materials, a material suitable for the diaphragm main body 7 and a material suitable for the edge 8 can be arbitrarily selected, and sound quality can be improved.

さらに、本実施形態は、振動板本体７もエッジ８も加熱加圧によりボディ成形した後に型抜きを行うため、径の小さなスピーカでも容易に製造でき、マイクロスピーカの製造にも適している。   Further, since the diaphragm main body 7 and the edge 8 are molded by heating and pressurizing, the present embodiment can be easily manufactured even with a speaker having a small diameter, and is suitable for manufacturing a micro speaker.

図１は内磁型のスピーカの一例を示したが、本発明は外磁型のスピーカにも適用可能である。図４は外磁型のスピーカの断面構造の一例を示す図である。図４では図１と共通する構成部分には同一符号を付してある。図４のスピーカについても、上述した（１）〜（３）の工程で製造した振動板９を適用可能である。   Although FIG. 1 shows an example of an inner magnet type speaker, the present invention is also applicable to an outer magnet type speaker. FIG. 4 is a diagram showing an example of a cross-sectional structure of an outer magnet type speaker. In FIG. 4, the same reference numerals are given to the components common to FIG. The diaphragm 9 manufactured in the steps (1) to (3) described above can also be applied to the speaker in FIG.

本発明は、サイズや形状に関係なく、各種のスピーカに適用可能である。また、スピーカの中には、ダンパーを有するものと有しないものがあるが、本発明は、ダンパーの有無に関係なく適用可能であり、ヘッドホン用のドライバにも適用可能である。   The present invention can be applied to various speakers regardless of the size and shape. Some speakers have a damper and some do not have a damper, but the present invention can be applied regardless of the presence or absence of the damper, and can also be applied to a driver for headphones.

図１および図４では、ドーム型の振動板本体７を用いる例を示したが、振動板本体７の形状には特に制限はなく、図５のような円錐状でもよいし、図６のようなフラット状でもよい。   1 and 4 show an example in which the dome-shaped diaphragm main body 7 is used. However, the shape of the diaphragm main body 7 is not particularly limited, and may be conical as shown in FIG. It may be a flat shape.

また、図１および図４では、ロール形状のエッジ８を採用しているが、エッジ８の形状についても特に制限はない。さらに、振動板９の形状にも特に制限はなく、図７に示すような円形状、図８に示すような楕円形状、図９に示すような四角形状など、種々の形状の振動板９が使用可能である。図７（ａ）、図８（ａ）、図９（ａ）はそれぞれエッジ８の上面図であり、図７（ｂ）は図７（ａ）のＡ−Ａ´線断面図、図８（ｂ）は図８（ａ）のＢ−Ｂ´線断面図、図９（ｂ）は図９（ａ）のＣ−Ｃ´線断面図である。図７（ｂ）、図８（ｂ）および図９（ｂ）の断面構造を見ればわかるように、振動板本体７の形状が変わっても、振動板本体７とエッジ８との接合部分の構造は同様であり、振動板本体７とエッジ８は熱圧着により直接接合される。   1 and 4, the roll-shaped edge 8 is employed, but the shape of the edge 8 is not particularly limited. Further, the shape of the diaphragm 9 is not particularly limited, and various shapes such as a circular shape as shown in FIG. 7, an elliptical shape as shown in FIG. 8, and a rectangular shape as shown in FIG. It can be used. 7 (a), 8 (a), and 9 (a) are top views of the edge 8, respectively, FIG. 7 (b) is a cross-sectional view taken along the line AA 'of FIG. 7 (a), and FIG. FIG. 9B is a sectional view taken along line BB ′ in FIG. 8A, and FIG. 9B is a sectional view taken along line CC ′ in FIG. As can be seen from the cross-sectional structures of FIGS. 7B, 8B, and 9B, even if the shape of the diaphragm main body 7 changes, the joint portion between the diaphragm main body 7 and the edge 8 can be changed. The structure is the same, and the diaphragm main body 7 and the edge 8 are directly joined by thermocompression bonding.

本発明の一実施形態によるスピーカの断面構造を示す図。The figure which shows the cross-section of the speaker by one Embodiment of this invention. 図１の振動板９の接合部分の拡大図。The enlarged view of the junction part of the diaphragm 9 of FIG. 振動板を製造する３つの工程の手順を示す図。The figure which shows the procedure of three processes which manufacture a diaphragm. 外磁型のスピーカの断面構造の一例を示す図。The figure which shows an example of the cross-section of an external magnet type speaker. 円錐状の振動板本体の一例を示す断面図。Sectional drawing which shows an example of a conical diaphragm main body. フラット状の振動板本体の一例を示す断面図。Sectional drawing which shows an example of a flat-shaped diaphragm main body. 円形状の振動板の上面図および断面図。The top view and sectional drawing of a circular-shaped diaphragm. 楕円形状の振動板の上面図および断面図。The top view and sectional drawing of an elliptical diaphragm. 四角形状の振動板の上面図および断面図。The top view and sectional drawing of a square-shaped diaphragm.

符号の説明Explanation of symbols

１ スピーカ
２ ヨーク
３ マグネット
４ ポールプレート
５ 磁気回路
６ ボイスコイル
７ 振動板本体
８ エッジ
９ 振動板 1 Speaker 2 Yoke 3 Magnet 4 Pole Plate 5 Magnetic Circuit 6 Voice Coil 7 Diaphragm Body 8 Edge 9 Diaphragm

Claims (8)

磁気回路と、
前記磁気回路の磁気ギャップ中に支持されるボイスコイルを有する振動板本体と、
前記振動板本体の外周縁部に、接着部材を介することなく熱圧着により直接接合されるエッジと、を備え、
前記振動板本体は、パルプと、第１の樹脂と、合成ゴムラテックスとを用いて形成され、
前記エッジは、第２の樹脂を用いて形成されることを特徴とするスピーカ。 A magnetic circuit;
A diaphragm body having a voice coil supported in a magnetic gap of the magnetic circuit;
An edge that is directly joined to the outer peripheral edge of the diaphragm main body by thermocompression bonding without an adhesive member;
The diaphragm main body is formed using pulp, a first resin, and a synthetic rubber latex,
The speaker is characterized in that the edge is formed using a second resin. 前記第１の樹脂は、ポリオレフィン樹脂を含むことを特徴とする請求項１に記載のスピーカ。   The speaker according to claim 1, wherein the first resin includes a polyolefin resin. 前記ポリオレフィン樹脂は、ポリエチレン樹脂を含むことを特徴とする請求項２に記載のスピーカ。   The speaker according to claim 2, wherein the polyolefin resin includes a polyethylene resin. 前記第１の樹脂は、ポリエーテル樹脂を含むことを特徴とする請求項１に記載のスピーカ。   The speaker according to claim 1, wherein the first resin includes a polyether resin. 前記第２の樹脂は、ポリエステル系ウレタン樹脂を含むことを特徴とする請求項１乃至４のいずれかに記載のスピーカ。   The speaker according to any one of claims 1 to 4, wherein the second resin includes a polyester-based urethane resin. 前記振動板本体の全質量に占める前記パルプおよび前記第１の樹脂の質量比は略等しく、かつ前記合成ゴムラテックスの質量比は前記振動板本体の全体質量の10〜20％であることを特徴とする請求項１乃至５のいずれかに記載のスピーカ。   The mass ratio of the pulp and the first resin in the total mass of the diaphragm main body is substantially equal, and the mass ratio of the synthetic rubber latex is 10 to 20% of the total mass of the diaphragm main body. The speaker according to any one of claims 1 to 5. パルプと、第１の樹脂と、合成ゴムラテックスとを用いて形成される振動板本体と、
前記振動板本体の外周縁部に、接着部材を介することなく熱圧着により直接接合され、第２の樹脂を用いて形成されるエッジと、を備えることを特徴とするスピーカ用振動板。 A diaphragm main body formed using pulp, a first resin, and a synthetic rubber latex;
A loudspeaker diaphragm, comprising: an edge that is directly joined to the outer peripheral edge of the diaphragm main body by thermocompression bonding without an adhesive member, and is formed using a second resin. 叩解されたパルプと、粉末状の第１の樹脂と、液体状の合成ゴムラテックスとを混合した混合物をシート状に引き延ばす工程と、
前記シート状に引き延ばした混合物を加熱加圧してボディ成形を行い、その後に外径抜きを行って振動板本体を形成する工程と、
第２の樹脂を加熱加圧してボディ成形を行い、その後に内径抜きを行ってエッジを形成する工程と、
前記振動板本体の外周縁部に、接着部材を介することなく熱圧着により前記エッジを直接接合して振動板を形成する工程と、を備えることを特徴とするスピーカ用振動板の製造方法。 Stretching the mixture of the beaten pulp, the powdery first resin, and the liquid synthetic rubber latex into a sheet;
Forming a diaphragm main body by heating and pressurizing the mixture stretched into the sheet to perform body molding, and then removing the outer diameter;
Performing a body molding by heating and pressurizing the second resin, and then performing an inner diameter removal to form an edge;
And a step of forming the diaphragm by directly joining the edge to the outer peripheral edge of the diaphragm body by thermocompression bonding without using an adhesive member.
JP2005132733A 2005-04-28 2005-04-28 Speaker, speaker diaphragm, and method for manufacturing speaker diaphragm Expired - Fee Related JP3940151B2 (en)

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CN104125528A (en) * 2013-04-25 2014-10-29 易音特电子株式会社 Bonding structure of diaphragm for microspeaker
EP2577993A4 (en) * 2010-06-04 2017-04-05 Apple Inc. System for vibration confinement
JP2018050330A (en) * 2017-11-21 2018-03-29 パイオニア株式会社 Speaker device
CN107484101B (en) * 2017-09-07 2020-05-26 追求电子科技（苏州）有限公司 Earphone processing technology
US11019443B2 (en) 2018-08-30 2021-05-25 Seiko Epson Corporation Speaker diaphragm including cone formed of material including fibers derived from plant and resin, speaker unit, speaker, and method for manufacturing speaker

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2577993A4 (en) * 2010-06-04 2017-04-05 Apple Inc. System for vibration confinement
CN104125528A (en) * 2013-04-25 2014-10-29 易音特电子株式会社 Bonding structure of diaphragm for microspeaker
US20140318885A1 (en) * 2013-04-25 2014-10-30 Em-Tech. Co., Ltd. Bonding structure of diaphragm for microspeaker
US9027700B2 (en) * 2013-04-25 2015-05-12 Em-Tech. Co., Ltd. Bonding structure of diaphragm for microspeaker
US20150208172A1 (en) * 2013-04-25 2015-07-23 Em-Tech. Co., Ltd. Microspeaker Diaphragm Bonding Structure
CN107484101B (en) * 2017-09-07 2020-05-26 追求电子科技（苏州）有限公司 Earphone processing technology
JP2018050330A (en) * 2017-11-21 2018-03-29 パイオニア株式会社 Speaker device
US11019443B2 (en) 2018-08-30 2021-05-25 Seiko Epson Corporation Speaker diaphragm including cone formed of material including fibers derived from plant and resin, speaker unit, speaker, and method for manufacturing speaker

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