JP2000004496A - Diaphragm for electroacoustic transducer - Google Patents
Diaphragm for electroacoustic transducerInfo
- Publication number
- JP2000004496A JP2000004496A JP16652398A JP16652398A JP2000004496A JP 2000004496 A JP2000004496 A JP 2000004496A JP 16652398 A JP16652398 A JP 16652398A JP 16652398 A JP16652398 A JP 16652398A JP 2000004496 A JP2000004496 A JP 2000004496A
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- Japan
- Prior art keywords
- diaphragm
- surface layer
- electroacoustic transducer
- injection
- mold
- 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.)
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- Diaphragms For Electromechanical Transducers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、インジェクション
成形法を用いて製造される多層構造の電気音響変換器用
振動板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm for an electroacoustic transducer having a multilayer structure manufactured by using an injection molding method.
【０００２】[0002]
【従来の技術】スピーカ等の電気音響変換器用振動板に
要望される物性は、比弾性率（Ｅ／ρ），比曲げ剛性率
（Ｅ／ρ3 ）が大きく、適度な内部損失を有し、機械的
疲労に強く、耐候性が良いことである。さらに近年で
は、車載用を中心に防水性も重要な特性の一つとなって
きている。このような要望に答えるべく、従来より種々
の金属、セラミックス、合成樹脂、合成繊維、天然セル
ロース繊維、さらに最近ではバイオ技術を用いた微生物
セルロース繊維等の素材が提案され、種々の加工法を用
いて加工され使用されてきた。2. Description of the Related Art The physical properties required of a diaphragm for an electroacoustic transducer such as a loudspeaker are such that a specific elastic modulus (E / ρ) and a specific flexural rigidity (E / ρ 3 ) are large, and an appropriate internal loss is obtained. It is resistant to mechanical fatigue and has good weather resistance. Further, in recent years, waterproofness has become one of the important characteristics mainly for use in vehicles. In order to respond to such demands, various metals, ceramics, synthetic resins, synthetic fibers, natural cellulose fibers, and more recently, materials such as microbial cellulose fibers using biotechnology have been proposed, and various processing methods have been used. Has been processed and used.
【０００３】その中で、金属やセラミックスは、弾性率
は大きいものの密度が高く、内部損失が小さいため、高
域再生用としては比較的優れているが、軽量高剛性が求
められる低〜中音域や全帯域用には不適当であった。ま
た、主原料に木材パルプ等のセルロース繊維を用いた、
いわゆる紙製振動板は、比較的軽量で適度な弾性率と内
部損失を有しており、また、製造方法も種々の方法があ
り設計の自由度も高いため、バランスの取れた振動板と
して古くから使用されてきた。[0003] Among them, metals and ceramics have a high elasticity but a high density and a small internal loss, so that they are relatively excellent for high-frequency reproduction, but are low to mid-range where light weight and high rigidity are required. And unsuitable for all bands. Also, using cellulose fibers such as wood pulp as the main raw material,
So-called paper diaphragms are relatively lightweight, have moderate elastic modulus and internal loss, and have a variety of manufacturing methods and a high degree of freedom in design. Has been used since.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、この紙
製振動板にも、弾性率に限界があること、防水性に乏し
いこと、主に天然繊維を用いているため、製造工程数も
多く複雑となり、ばらつきが大きい等の問題があった。
一方、合成樹脂振動板は、近年、主にポリプロピレン等
のオレフィン系樹脂をベースにマイカ、カーボン繊維等
のフィラーを混合し、主にインジェクション成形法を用
いて成形されている。このインジェクション成形による
合成樹脂振動板は、防水性はもちろん、比較的高弾性の
ものをばらつき少なく安価に製造できるため、優れた振
動板と言えるが、製造工程上、混合できるフィラーの種
類や充填量に限界があるため、設計の自由度の低いこと
が欠点であった。However, this paper diaphragm also has a limited elastic modulus, poor water resistance, and is mainly made of natural fibers, so that the number of manufacturing steps is large and complicated. And large variations.
On the other hand, in recent years, synthetic resin diaphragms are mainly formed by injection molding mainly by mixing a filler such as mica and carbon fiber based on an olefin resin such as polypropylene. This synthetic resin diaphragm made by injection molding can be said to be an excellent diaphragm because it is not only waterproof but also relatively high elasticity can be manufactured inexpensively with little variation.However, due to the manufacturing process, the type and amount of filler that can be mixed However, there is a drawback in that the degree of freedom in design is low because of limitations.
【０００５】本発明はこのような点に鑑みてなされたも
のであり、インジェクション成形合成樹脂振動板の設計
の自由度を高め、かつ、多層構造のもつ優れた特性の電
気音響変換器用振動板を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and provides a diaphragm for an electroacoustic transducer having a multilayer structure, which has a high degree of freedom in designing an injection-molded synthetic resin diaphragm and has excellent characteristics. The purpose is to provide.
【０００６】[0006]
【課題を解決するための手段】インジェクション成形法
を用いて製造される合成樹脂振動板において、金型に予
め所定の形状に成形した表面層用振動板をインサートし
ておき、所定の金型ギャップを設けた後、表面層用振動
板の材料と別の射出材を射出し、厚さ方向に少なくとも
二つ以上の異なる材質の層を設け、多層構造のもつ優れ
た特性の電気音響変換器用振動板を得る。SUMMARY OF THE INVENTION In a synthetic resin diaphragm manufactured by using an injection molding method, a surface layer diaphragm previously formed into a predetermined shape is inserted into a mold, and a predetermined mold gap is formed. After that, the injection material different from the material of the surface layer diaphragm is injected, and at least two or more layers of different materials are provided in the thickness direction, and the multilayer structure has excellent characteristics for the electroacoustic transducer. Get the board.
【０００７】[0007]
【発明の実施の形態】上記課題を解決するために本発明
の電気音響変換器用振動板は、少なくとも一方の金型に
予め所定の形状に成形した表面層用振動板をインサート
しておき、金型を所定の位置まで動かして所定の金型ギ
ャップを設け、その空間にインジェクション成形法を用
いて前記表面層用振動板の材料とは別の射出材を射出
し、厚さ方向に少なくとも二つ以上の異なる材質の層が
設けられていることに特徴を有している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above-mentioned problems, a diaphragm for an electroacoustic transducer of the present invention has a diaphragm for a surface layer formed in a predetermined shape previously inserted into at least one die. The mold is moved to a predetermined position to provide a predetermined mold gap, and an injection material different from the material of the surface layer diaphragm is injected into the space using an injection molding method, and at least two injection materials are formed in the thickness direction. It is characterized in that layers of the above different materials are provided.
【０００８】また、金型ギャップを本来得ようとしてい
る厚みより大き目に設け、射出材の射出途中もしくは射
出後さらにプレスを行うことにより所定の厚さに成形さ
れていることに特徴を有している。さらに、表面層用振
動板は接着剤が塗布されていることに特徴を有してい
る。[0008] Further, the present invention is characterized in that the mold gap is formed to be larger than the thickness originally intended, and is formed to a predetermined thickness by further pressing during or after injection of the injection material. I have. Further, the surface layer diaphragm is characterized in that an adhesive is applied.
【０００９】また、表裏２枚の表面層用振動板はバクテ
リアセルロースであり、その間を充填する射出材はポリ
プロピレンであることに特徴を有している。さらに、表
面層用振動板はポリ・パラ・フェニレン・テレフタラミ
ドであり、接着剤を介しての射出材はポリメチルペンテ
ンであることに特徴を有している。[0009] Further, it is characterized in that the front and back two diaphragms for the surface layer are made of bacterial cellulose, and the injection material between them is made of polypropylene. Further, it is characterized in that the diaphragm for the surface layer is poly-para-phenylene-terephthalamide, and the injection material via the adhesive is polymethylpentene.
【００１０】[0010]
【実施例】以下、本発明の一実施例を図面に基づいて説
明する。実施例はフリーエッジタイプの振動板である
が、フィックスドエッジタイプにも適用できることは言
うまてもない。図１は、本発明による多層構造の電気音
響変換器用振動板の断面図である。図において、１は電
気音響変換器用振動板、２はエッジ、３は振動板本体、
４は表面層用振動板、５は射出材である。２枚の表面層
用振動板４の間の射出材５は表面層用振動板４と異なる
材料から形成されている。従って、振動板本体３は３層
構造となっており、多層構造の優れた特性を有してい
る。An embodiment of the present invention will be described below with reference to the drawings. Although the embodiment is a free edge type diaphragm, it is needless to say that the present invention can be applied to a fixed edge type diaphragm. FIG. 1 is a sectional view of a diaphragm for an electroacoustic transducer having a multilayer structure according to the present invention. In the figure, 1 is a diaphragm for an electroacoustic transducer, 2 is an edge, 3 is a diaphragm main body,
Reference numeral 4 denotes a surface layer diaphragm, and reference numeral 5 denotes an injection material. The injection material 5 between the two surface layer diaphragms 4 is formed of a material different from that of the surface layer diaphragm 4. Therefore, the diaphragm main body 3 has a three-layer structure, and has excellent characteristics of a multilayer structure.
【００１１】本発明の第１実施例を図２，図４及び図５
に基づいて説明する。図２は、本発明の第１実施例にお
ける電気音響変換器用振動板を構成する振動板本体の断
面図であり、図４は、本発明による電気音響変換器用振
動板を構成する振動板本体の製造工程を示す図である。
図において、４はバクテリアセルロースからなる表面層
用振動板、５はポリプロピレンからなる射出材である。
また、１０は雄金型、１１は雌金型である。FIGS. 2, 4 and 5 show a first embodiment of the present invention.
It will be described based on. FIG. 2 is a cross-sectional view of a diaphragm main body constituting the diaphragm for an electroacoustic transducer according to the first embodiment of the present invention, and FIG. 4 is a sectional view of the diaphragm main body constituting the diaphragm for an electroacoustic transducer according to the present invention. It is a figure showing a manufacturing process.
In the drawing, reference numeral 4 denotes a surface layer diaphragm made of bacterial cellulose, and reference numeral 5 denotes an injection material made of polypropylene.
Reference numeral 10 denotes a male mold, and 11 denotes a female mold.
【００１２】１．表面層用振動板４の作製 １ａ 微生物より得たバクテリアセルロースに約２倍の
質量の水を加え、ミキサーにて３分間離解し、パルプス
ラリーを作製した。 １ｂ １ａで作製したパルプスラリーを湿式抄造法で所
定の形状に抄き上げ、水分量約８０％に調整した後、所
定の金型で加圧加熱乾燥（１２０℃、２ｋｇ／ｃｍ2 ，
６０秒）し、約７０μの厚さの表面層用振動板４を２枚
作製した。 １ｃ １ｂで作製した表面層用振動板４のセンター部に
ゲート用の穴（φ１０ｍｍ）をあけた。1. Preparation of Vibration Plate 4 for Surface Layer 1a About twice the mass of water was added to bacterial cellulose obtained from microorganisms, and the mixture was disintegrated with a mixer for 3 minutes to prepare a pulp slurry. 1b The pulp slurry prepared in 1a was formed into a predetermined shape by a wet papermaking method, adjusted to a water content of about 80%, and then dried under pressure and heat (120 ° C, 2 kg / cm 2 ,
60 seconds) to produce two surface layer diaphragms 4 having a thickness of about 70 μm. 1c A hole (φ10 mm) for a gate was made in the center of the surface layer diaphragm 4 prepared in 1b.
【００１３】２．射出成形 ２ａ １ｃ．で作製した２枚の表面層用振動板４を予め
射出成形機に取り付けられた所定の形状を持った雄金型
１０、雌金型１１にそれぞれインサート（図４，ａ参
照）し、型内の真空吸着装置により金型に固定（図４，
ｂ参照）した。 ２ｂ 金型を所定の位置まで動かし、本来得ようとして
いる金型ギャップより大き目の空間（図４，ｃ参照）を
設けた後、予め射出成形機に投入しておいた射出材５で
あるポリプロピレン（三菱ポリプロＢＣ２Ａ）を射出
（図４，ｄ参照）し、さらに、射出されたポリプロピレ
ンが固まらないうちにプレス（図４，ｅ参照）を行い所
定の厚さ（約３００μ）の３層構造の振動板本体３（図
４，ｆ参照）を得た。2. Injection molding 2a 1c. Insert the two surface layer diaphragms 4 prepared in (1) into a male mold 10 and a female mold 11 (see FIG. 4, a) each having a predetermined shape and attached to an injection molding machine in advance. (Fig. 4)
b). 2b After moving the mold to a predetermined position to provide a space larger than the mold gap to be originally obtained (see FIG. 4C), the polypropylene as the injection material 5 previously charged into the injection molding machine (Mitsubishi Polypropylene BC2A) is injected (see FIG. 4, d), and further pressed (see FIG. 4, e) before the injected polypropylene is solidified to form a three-layer structure having a predetermined thickness (about 300 μ). A diaphragm main body 3 (see FIGS. 4 and 4) was obtained.
【００１４】図５は、本発明による電気音響変換器用振
動板を用いたスピーカと従来の電気音響変換器用振動板
を用いたスピーカとを比較する周波数−音圧特性図であ
る。図において、実線Ａは第１実施例による特性、実線
Ｂは第２実施例による特性、破線Ｃは従来例における特
性である。 ３．性能確認 ３ａ ２ｂで得られた３層構造の振動板本体３を所定の
寸法に打ち抜き、所定の形状に成形された発泡ゴムエッ
ジを貼り合わせ、図１の形状の電気音響変換器用振動板
１を得た。 ３ｂ ３ａで得られた電気音響変換器用振動板１を口径
１３ｃm のスピーカに組み込み、周波数−音圧特性（図
５−実線Ａ参照）を測定した。 また、材料、成形工程は前述のものと同様にし、形状を
平板としたものを作製し、振動リード法を用いて物性の
測定を行った。比較用としてはポリプロピレン７０％，
マイカ３０％で構成された材料（クラレＭＲＰ２３０）
を同じ射出成形機及び金型で成形したものを用いた。も
ちろんその他の工程及び材料は第１実施例と同様とし
た。周波数−音圧特性（図５−破線Ｃ参照）を測定し
た。物性については、表１の通り第１実施例は従来品に
比べ高い比弾性率（音速）と高い比曲げ剛性率、さらに
適度な内部損失を有していることから、優れた振動板と
推測できる。周波数−音圧特性は物性値の高さを裏付け
る結果となり、図５の通り実施例１は従来品に比べ高域
再生限界が延び、優れた性能を提供している。FIG. 5 is a frequency-sound pressure characteristic diagram comparing a speaker using a diaphragm for an electroacoustic transducer according to the present invention with a speaker using a conventional diaphragm for an electroacoustic transducer. In the figure, a solid line A is a characteristic according to the first embodiment, a solid line B is a characteristic according to the second embodiment, and a broken line C is a characteristic according to the conventional example. 3. Performance confirmation 3a The diaphragm main body 3 having a three-layer structure obtained in 2b is punched into a predetermined size, and a foamed rubber edge formed into a predetermined shape is bonded to obtain a diaphragm 1 for an electroacoustic transducer having the shape shown in FIG. Was. 3b The diaphragm 1 for an electroacoustic transducer obtained in 3a was assembled in a speaker having a diameter of 13 cm, and the frequency-sound pressure characteristic (see FIG. 5-solid line A) was measured. The material and the molding process were the same as those described above, a flat plate was produced, and the physical properties were measured using the vibration lead method. 70% polypropylene for comparison,
Material composed of 30% mica (Kuraray MRP230)
Was molded using the same injection molding machine and mold. Of course, other steps and materials were the same as in the first embodiment. The frequency-sound pressure characteristics (see FIG. 5 dashed line C) were measured. Regarding the physical properties, as shown in Table 1, the first example is presumed to be an excellent diaphragm because it has a higher specific elastic modulus (sonic velocity), a higher specific bending rigidity, and a moderate internal loss as compared with the conventional product. it can. As a result, the frequency-sound pressure characteristic confirms the high physical property value, and as shown in FIG. 5, the high-frequency reproduction limit of Example 1 is longer than that of the conventional product, and excellent performance is provided.
【００１５】図３は、本発明の第２実施例における電気
音響変換器用振動板を構成する振動板本体の断面図であ
る。図において、７はＰＰＴＡからなる表面層用振動
板、８はポリプロピレンからなる射出材、９は接着剤で
ある。FIG. 3 is a sectional view of a diaphragm main body constituting a diaphragm for an electroacoustic transducer according to a second embodiment of the present invention. In the drawing, 7 is a surface layer diaphragm made of PPTA, 8 is an injection material made of polypropylene, and 9 is an adhesive.
【００１６】１．表面層用振動板７の作製 １ａ 材厚５０μのポリ・パラ・フェニレン・テレフタ
ラミド（ＰＰＴＡ）フィルムを３５０℃，８ｋｇ／ｃｍ
2 ，３０秒で所定の形状に成形し、表面層用振動板７を
作製した。 １ｂ １ａで作製した表面層用振動板７の裏面（凸面）
に接着剤９を塗布した。 ２．射出成形 ２ａ １ｂで作製した表面層用振動板７を予め射出成形
機に取り付けられた所定の形状を持った金型（凸型）に
インサートし、型内の真空吸着装置により金型に固定し
た。 ２ｂ 金型を所定の位置まで動かし、本来得ようとして
いる金型ギャップより大き目の空間を設けた後、予め射
出成形機に投入しておいたポリメチルペンテン（三井石
油化学工業ＴＰＸＭＸ−００４）を射出し、さらに、射
出されたポリメチルペンテンが固まらないうちにプレス
を行い所定の厚さ（約３００μ）の２層構造の振動板本
体６を得た。1. Production of diaphragm 7 for surface layer 1a A polyparaphenylene terephthalamide (PPTA) film having a thickness of 50 μm was formed at 350 ° C. and 8 kg / cm.
It was formed into a predetermined shape in 2 and 30 seconds, and a diaphragm 7 for a surface layer was produced. 1b Back surface (convex surface) of surface layer diaphragm 7 prepared in 1a
Was applied with an adhesive 9. 2. The surface layer diaphragm 7 prepared by injection molding 2a and 1b was inserted into a mold (convex mold) having a predetermined shape attached to an injection molding machine in advance, and was fixed to the mold by a vacuum suction device in the mold. . 2b After moving the mold to a predetermined position to provide a space larger than the mold gap to be originally obtained, polymethylpentene (Mitsui Petrochemical Kogyo Co., Ltd. TPXMX-004) previously charged into the injection molding machine is used. Injection was further performed before the injected polymethylpentene was solidified to obtain a diaphragm main body 6 having a two-layer structure with a predetermined thickness (about 300 μm).
【００１７】３．性能確認 ３ａ ２ｂで得られた２層構造の振動板本体を所定の寸
法に打ち抜き、所定の形状に成形された発泡ゴムエッジ
を貼り合わせ、図１の形状の電気音響変換器用振動板を
得た。 ３ｂ ３ａで得られた振動板本体６を口径１３ｃｍのス
ピーカに組み込み、周波数−音圧特性（図５−実線Ｂ参
照）を測定した。 また、材料、成形工程は前述のものと同様にし、形状を
平板としたものを作製し、振動リード法を用いて物性の
測定を行った。比較用としては第１実施例と同様にポリ
プロピレン７０％，マイカ３０％で構成された材料（ク
ラレＭＲＰ２３０）を同じ射出成形機及び金型で成形し
たものを用いた。もちろんその他の工程及び材料は第２
実施例と同様とした。物性については、表１の通り第２
実施例は従来品に比べ高い比弾性率（音速）と高い比曲
げ剛性率、さらに適度な内部損失を有していることか
ら、優れた振動板と推測できる。周波数−音圧特性（図
５−実線Ｂ参照）は物性値の高さを裏付ける結果とな
り、図５の通り第２実施例は従来品（図５−破線Ｃ参
照）に比ベ高域再生限界が延び、優れた性能を提供して
いる。3. Performance Confirmation The diaphragm main body having a two-layer structure obtained in 3a and 2b was punched into a predetermined size, and a foamed rubber edge formed into a predetermined shape was bonded to obtain a diaphragm for an electroacoustic transducer having the shape shown in FIG. 3b The diaphragm main body 6 obtained in 3a was assembled in a speaker having a diameter of 13 cm, and frequency-sound pressure characteristics (see FIG. 5-solid line B) were measured. The material and the molding process were the same as those described above, a flat plate was produced, and the physical properties were measured using the vibration lead method. As a comparative example, a material (Kuraray MRP230) composed of 70% of polypropylene and 30% of mica molded by the same injection molding machine and mold as in the first embodiment was used. Of course, other processes and materials are second
It was the same as the example. Regarding physical properties, as shown in Table 1,
Since the example has a higher specific elastic modulus (sonic velocity), a higher specific bending rigidity, and an appropriate internal loss as compared with the conventional product, it can be inferred to be an excellent diaphragm. The frequency-sound pressure characteristic (see FIG. 5-solid line B) confirms the high physical property value. As shown in FIG. 5, the second embodiment has a higher reproduction limit than the conventional product (see FIG. 5-dashed line C). And provide excellent performance.
【００１８】 [0018]
【００１９】実施例以外にもいろいろな組み合わせが可
能で、例えば、片側の表面層をアルミニウムにし、もう
片側の表面層を植物セルロース繊維からなる、いわゆる
紙にし、中間層を構成する射出材料をカーボン繊維入り
のポリプロピレンにした３層構造のものも作製可能であ
る。その他インサートする材料としてはチタン、マグネ
シウム等の金属やそれらの合金、ポリエチレシテレフタ
レート、ポリブチレンテレフタレート、ポリサルホン、
ポリエーテルサルフォン、ポリフェニレンサルファイ
ド、ポリイミド、ポリエチレンナフタレート、ポリカー
ボネート、アクリロニトリルーブタジエン−スチレシ三
元共重合体、ポリエチレン、ポリアミド、ポリスチレ
ン、液晶ポリマー等の合成樹脂及びこれらのアロイ、さ
らにセラミックス等が使用でき、射出する材料としては
ポリエチレンテレフタレート、ポリブチレンテレフタレ
ート、ポリサルホン、ポリエーテルサルフォン、ポリフ
ェニレンサルファイド、ポリイミド、ポリエチレンナフ
タレート、ポリカーボネート、アクリロニトリル−ブタ
ジエン−スチレン三元共重合体、ポリエチレン、ポリア
ミド、ポリスチレン、液晶ポリマー等の合成樹脂及びこ
れらのアロイが使用できる。In addition to the examples, various combinations are possible. For example, one surface layer is made of aluminum, the other surface layer is made of vegetable cellulose fiber, so-called paper, and the injection material constituting the intermediate layer is made of carbon. A three-layer structure made of fiber-containing polypropylene can also be manufactured. Other materials to be inserted include metals such as titanium and magnesium and alloys thereof, polyethylene terephthalate, polybutylene terephthalate, polysulfone,
Polyethersulfone, polyphenylene sulfide, polyimide, polyethylene naphthalate, polycarbonate, acrylonitrile butadiene-styreshi terpolymer, polyethylene, polyamide, polystyrene, synthetic resins such as liquid crystal polymers and alloys thereof, and furthermore ceramics can be used. The material to be injected is polyethylene terephthalate, polybutylene terephthalate, polysulfone, polyethersulfone, polyphenylene sulfide, polyimide, polyethylene naphthalate, polycarbonate, acrylonitrile-butadiene-styrene terpolymer, polyethylene, polyamide, polystyrene, liquid crystal polymer Synthetic resins and alloys thereof can be used.
【００２０】[0020]
【発明の効果】本発明により、インジェクション成形合
成樹脂振動板の設計の自由度を高め、かつ、多層構造の
もつ、優れた特性の振動板を提供できる。多層構造振動
板は、異なる材料の層を厚さ方向に配することにより、
それぞれの材質の特徴を充分に生かすことができ、さら
に、層状に配することによる物理的な効果により、優れ
た特性の振動板を提供することが出来る。例えば、高弾
性であっても、密度が高く、内部損失が小さいために単
体では高域再生用以外に使用できなかった材料を表面層
にし、内部を弾性率はそれほどでもないが、比較的密度
が低く、高い内部損失を有した材料にした３層構造の振
動板は、高い比弾性率と高い比曲げ剛性率と適度な内部
損失を有した、理想的な振動板となる。また、耐候性に
おいても、表面に耐候性の良い材料を配することによ
り、裏面や内部の材料を保護することが出来るため、従
来耐候性が問題で使用できなかった材料も有効に使用す
ることができる。また、高価な紫外線吸収剤等を添加し
ていたものは、これらの添加剤を添加しなくともよくな
るため、コストの低減がはかれる。According to the present invention, it is possible to increase the degree of freedom in designing an injection molded synthetic resin diaphragm and provide a diaphragm having a multilayer structure and excellent characteristics. Multi-layered diaphragms are made by disposing layers of different materials in the thickness direction.
The characteristics of each material can be fully utilized, and furthermore, a diaphragm having excellent characteristics can be provided by the physical effect of arranging the layers. For example, even if it has high elasticity, it has a surface layer made of a material that could not be used for anything other than high-frequency reproduction alone because of its high density and low internal loss. A three-layer structure diaphragm made of a material having a low internal loss and a high internal loss becomes an ideal diaphragm having a high specific elastic modulus, a high specific bending rigidity, and an appropriate internal loss. Also, in terms of weather resistance, by arranging a material with good weather resistance on the front surface, it is possible to protect the back and inside materials, so it is necessary to effectively use materials that could not be used due to problems with weather resistance in the past. Can be. In addition, those to which expensive ultraviolet absorbers and the like have been added do not need to add these additives, so that the cost can be reduced.
【図１】本発明による多層構造の電気音響変換器用振動
板の断面図である。FIG. 1 is a sectional view of a diaphragm for an electroacoustic transducer having a multilayer structure according to the present invention.
【図２】本発明の第１実施例における電気音響変換器用
振動板を構成する振動板本体の断面図である。FIG. 2 is a sectional view of a diaphragm main body constituting the diaphragm for an electroacoustic transducer according to the first embodiment of the present invention.
【図３】本発明の第２実施例における電気音響変換器用
振動板を構成する振動板本体の断面図である。FIG. 3 is a sectional view of a diaphragm main body constituting a diaphragm for an electroacoustic transducer according to a second embodiment of the present invention.
【図４】本発明による電気音響変換器用振動板を構成す
る振動板本体の製造工程を示す図である。FIG. 4 is a view showing a manufacturing process of a diaphragm main body constituting a diaphragm for an electroacoustic transducer according to the present invention.
【図５】本発明による電気音響変換器用振動板を用いた
スピーカと従来の電気音響変換器用振動板を用いたスピ
ーカとを比較する周波数−音圧特性図である。FIG. 5 is a frequency-sound pressure characteristic diagram comparing a speaker using a diaphragm for an electroacoustic transducer according to the present invention with a speaker using a conventional diaphragm for an electroacoustic transducer.
１ 電気音響変換器用振動板 ２ エッジ ３ 振動板本体 ４ 表面層用振動板 ５ 射出材 ６ 振動板本体 ７ 表面層用振動板 ８ 射出材 ９ 接着剤 １０ 雄金型 １１ 雌金型 Reference Signs List 1 diaphragm for electroacoustic transducer 2 edge 3 diaphragm main body 4 diaphragm for surface layer 5 injection material 6 diaphragm main body 7 diaphragm for surface layer 8 injection material 9 adhesive 10 male mold 11 female mold
Claims (5)
に成形した表面層用振動板をインサートしておき、 金型を所定の位置まで動かして所定の金型ギャップを設
け、 その空間にインジェクション成形法を用いて前記表面層
用振動板の材料とは別の射出材を射出し、 厚さ方向に少なくとも二つ以上の異なる材質の層が設け
られていることを特徴とする電気音響変換機用振動板。1. A surface layer diaphragm formed in a predetermined shape in advance is inserted into at least one of the molds, and the mold is moved to a predetermined position to provide a predetermined mold gap. An electroacoustic transducer characterized in that at least two or more layers of different materials are provided in a thickness direction by injecting an injection material different from the material of the surface layer diaphragm using a molding method. Diaphragm.
る厚みより大き目に設け、 射出材の射出途中もしくは射出後さらにプレスを行うこ
とにより所定の厚さに成形されていることを特徴とする
請求項１記載の電気音響変換機用振動板。2. The molding machine according to claim 1, wherein the mold gap is provided with a thickness larger than the thickness originally intended, and is formed to a predetermined thickness by further pressing during or after injection of the injection material. Item 4. A diaphragm for an electroacoustic transducer according to item 1.
ていることを特徴とする請求項１及び２記載の電気音響
変換機用振動板。3. The diaphragm for an electroacoustic transducer according to claim 1, wherein the surface layer diaphragm is coated with an adhesive.
リアセルロースであり、その間を充填する射出材はポリ
プロピレンであることを特徴とする請求項１ないし３記
載の電気音響変換機用振動板。4. The diaphragm for an electroacoustic transducer according to claim 1, wherein said front and rear diaphragms for the surface layer are made of bacterial cellulose, and an injection material filled between them is polypropylene. .
ニレン・テレフタラミド（ＰＰＴＡ）であり、接着剤を
介しての射出材はポリメチルペンテンであることを特徴
とする請求項１ないし３記載の電気音響変換機用振動
板。5. The surface layer diaphragm is made of poly-para-phenylene-terephthalamide (PPTA), and an injection material through an adhesive is made of polymethylpentene. Diaphragm for electro-acoustic transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16652398A JP2000004496A (en) | 1998-06-15 | 1998-06-15 | Diaphragm for electroacoustic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16652398A JP2000004496A (en) | 1998-06-15 | 1998-06-15 | Diaphragm for electroacoustic transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000004496A true JP2000004496A (en) | 2000-01-07 |
Family
ID=15832902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16652398A Pending JP2000004496A (en) | 1998-06-15 | 1998-06-15 | Diaphragm for electroacoustic transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000004496A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004032026A (en) * | 2002-06-21 | 2004-01-29 | Matsushita Electric Ind Co Ltd | Film for speaker diaphragm, diaphragm for speaker, and speaker employing the same |
| WO2006018880A1 (en) * | 2004-08-19 | 2006-02-23 | Og Corporation | Diaphragm for speaker |
| JP2007060107A (en) * | 2005-08-23 | 2007-03-08 | Pioneer Electronic Corp | Production process of vibration cone for electroacoustic transducer, and vibration cone for electroacoustic transducer |
| US7290639B2 (en) * | 2004-05-18 | 2007-11-06 | Pioneer Corporation | Method for manufacturing speaker-use center cap |
| US7704428B2 (en) | 2004-04-26 | 2010-04-27 | Pioneer Corporation | Method for manufacturing diaphragm for use in electroacoustic transducer |
| WO2015011903A1 (en) * | 2013-07-25 | 2015-01-29 | パナソニックＩｐマネジメント株式会社 | Loudspeaker-purpose vibration plate, loudspeaker using that vibration plate, electronic device, and mobile apparatus |
| CN105723741A (en) * | 2014-09-08 | 2016-06-29 | 松下知识产权经营株式会社 | Diaphragm for loudspeaker, loudspeaker using diaphragm, electronic device, and moving body device |
-
1998
- 1998-06-15 JP JP16652398A patent/JP2000004496A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004032026A (en) * | 2002-06-21 | 2004-01-29 | Matsushita Electric Ind Co Ltd | Film for speaker diaphragm, diaphragm for speaker, and speaker employing the same |
| US7704428B2 (en) | 2004-04-26 | 2010-04-27 | Pioneer Corporation | Method for manufacturing diaphragm for use in electroacoustic transducer |
| US7290639B2 (en) * | 2004-05-18 | 2007-11-06 | Pioneer Corporation | Method for manufacturing speaker-use center cap |
| WO2006018880A1 (en) * | 2004-08-19 | 2006-02-23 | Og Corporation | Diaphragm for speaker |
| JP2007060107A (en) * | 2005-08-23 | 2007-03-08 | Pioneer Electronic Corp | Production process of vibration cone for electroacoustic transducer, and vibration cone for electroacoustic transducer |
| JP4553377B2 (en) * | 2005-08-23 | 2010-09-29 | パイオニア株式会社 | Method for manufacturing diaphragm for electroacoustic transducer, and diaphragm for electroacoustic transducer |
| WO2015011903A1 (en) * | 2013-07-25 | 2015-01-29 | パナソニックＩｐマネジメント株式会社 | Loudspeaker-purpose vibration plate, loudspeaker using that vibration plate, electronic device, and mobile apparatus |
| JPWO2015011903A1 (en) * | 2013-07-25 | 2017-03-02 | パナソニックＩｐマネジメント株式会社 | Loudspeaker diaphragm, loudspeaker using the diaphragm, electronic device, and mobile device |
| CN105723741A (en) * | 2014-09-08 | 2016-06-29 | 松下知识产权经营株式会社 | Diaphragm for loudspeaker, loudspeaker using diaphragm, electronic device, and moving body device |
| EP3193515A4 (en) * | 2014-09-08 | 2017-07-19 | Panasonic Intellectual Property Management Co., Ltd. | Diaphragm for loudspeaker, loudspeaker using diaphragm, electronic device, and moving body device |
| CN105723741B (en) * | 2014-09-08 | 2019-10-01 | 松下知识产权经营株式会社 | Diaphragm for speaker, loudspeaker, electronic equipment and mobile body device |
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