JP2006129111A

JP2006129111A - Loudspeaker and diaphragm therefor

Info

Publication number: JP2006129111A
Application number: JP2004315112A
Authority: JP
Inventors: Takashi Miyakura; 隆志宮倉
Original assignee: Hosiden Corp
Current assignee: Hosiden Corp
Priority date: 2004-10-29
Filing date: 2004-10-29
Publication date: 2006-05-18

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diaphragm for a loudspeaker, and the loudspeaker, which are simply applied to all diaphragms for a loudspeaker, not only as a special diaphragm for a loudspeaker, effectively suppress abnormal vibration of the diaphragm while surely suppressing increase of the minimum resonant frequency of the diaphragm, and improve an acoustic performance. <P>SOLUTION: The diaphragm for the loudspeaker 6 is made from a resin film, and is provided with the dome 6a of a shape swelling upwards, and an edge 6b of a shape swelling upwards which is formed as a one body around the dome 6a. And, an annular reinforcement 8 whose thickness is thicker than other sections between the side end edge of the dome of the edge 6b and a top. The loudspeaker 1 is provided with the diaphragm 6, a voice coil 7 in which an end is connected to a boundary 6c between the dome 6a of the diaphragm 6 and the edge 6b, and a magnetic circuit 5 which drives the voice coil 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、スピーカ用振動板及びスピーカ（電気音響変換器）に関する。 The present invention relates to a speaker diaphragm and a speaker (electroacoustic transducer).

図４は従来の小型スピーカ１０の構造を示す断面図である。図において２はヨークフレームで、その中央部にはカップ状の凹部２ａを有し、凹部２ａの中には、その凹部２ａの周側壁との間に所定の距離を隔ててマグネット３が固着され、また、マグネット２の上面にはトッププレート４が固着され、これらヨークフレーム２、マグネット３、トッププレート４により磁気回路５が構成されている。小型スピーカ１０はまた、振動板６とボイスコイル７からなる振動系を備える。振動板６は、厚さが、例えば３０μｍ以下の樹脂（ポリエステル等）フィルムからなり、上方に膨らんだ形状のドーム部６ａと、その外周辺に一体に形成された上方に膨らんだ形状のエッジ部６ｂとを備え、エッジ部６ｂの外周端縁がヨークフレーム２の外周端縁に固着され、ドーム部６ａがエッジ部６ｂを介してトッププレート４の上方に対向支持されると共に、ドーム部６ａとエッジ部６ｂとの間の境界部６ｃがヨークフレーム２の凹部２ａ周側壁とトッププレート４との間に形成された環状の隙間、すなわち、磁気ギャップ５ａの上方に対向状に位置している。ボイスコイル７は、一端部が振動板６のドーム部６ａとエッジ部６ｂとの間の境界部６ｃの裏面に固着され、他端部が磁気ギャップ５ａからヨークフレーム２の凹部２ａ周側壁とトッププレート４との間に形成された環状の隙間に垂下支持されている。そして、ボイスコイル７に電流（音信号）を供給すると、磁気ギャップ５ａの磁界との電磁作用で、ボイスコイル７が上下に振動し、それに伴い振動板７が上下に振動し、音響や音声を発生する。 FIG. 4 is a cross-sectional view showing the structure of a conventional small speaker 10. In the figure, reference numeral 2 denotes a yoke frame, which has a cup-shaped recess 2a at the center thereof, and a magnet 3 is fixed in the recess 2a with a predetermined distance from the peripheral side wall of the recess 2a. A top plate 4 is fixed to the upper surface of the magnet 2, and a magnetic circuit 5 is constituted by the yoke frame 2, the magnet 3, and the top plate 4. The small speaker 10 also includes a vibration system including a diaphragm 6 and a voice coil 7. The diaphragm 6 is made of a resin (polyester or the like) film having a thickness of, for example, 30 μm or less, and has a dome portion 6a that swells upward, and an edge portion that swells upward and is integrally formed on the outer periphery thereof. 6b, the outer peripheral edge of the edge portion 6b is fixed to the outer peripheral edge of the yoke frame 2, the dome portion 6a is supported and supported above the top plate 4 via the edge portion 6b, and the dome portion 6a A boundary portion 6c between the edge portion 6b and the annular gap formed between the peripheral side wall of the concave portion 2a of the yoke frame 2 and the top plate 4, that is, the magnetic gap 5a is located in an opposing manner. The voice coil 7 has one end fixed to the back surface of the boundary portion 6c between the dome portion 6a and the edge portion 6b of the diaphragm 6, and the other end from the magnetic gap 5a to the peripheral wall of the recess 2a of the yoke frame 2 and the top. It is suspended and supported by an annular gap formed between the plate 4 and the plate 4. When a current (sound signal) is supplied to the voice coil 7, the voice coil 7 vibrates up and down due to electromagnetic action with the magnetic field of the magnetic gap 5 a, and the diaphragm 7 vibrates up and down along with this, so that sound and voice can be transmitted. appear.

ところで、上記のように厚さ３０μｍ以下の薄い振動板を用いた小型スピーカでは、振動板とボイスコイルに起因する高次共振により振動板が傾いて振動する異常振動を起こすことがある。この異常振動を起こす周波数では歪みの増加、音圧の低下が生じ、スピーカの品質が著しく低下する。これを改善するために振動板全体の厚さを厚くすると異常振動を抑えることができるが、振動板の最低共振周波数が高くなり、低い周波数帯域での高出力を得ることが困難になる。これは、質量ｍ、損失ｒ、スチフネスｓで構成される単一振動系の場合、振動板の最低共振周波数
ｆ₀＝（１／２π）（ｓ／ｍ）^2/1・・・（１）
であるため、スチフネスｓを付加し過ぎた結果と言える。 By the way, in a small speaker using a thin diaphragm having a thickness of 30 μm or less as described above, abnormal vibration in which the diaphragm tilts and vibrates due to higher order resonance caused by the diaphragm and the voice coil may occur. At frequencies that cause this abnormal vibration, distortion increases and sound pressure decreases, and the quality of the speaker significantly decreases. If the thickness of the entire diaphragm is increased in order to improve this, abnormal vibration can be suppressed, but the minimum resonance frequency of the diaphragm becomes high, and it becomes difficult to obtain a high output in a low frequency band. In the case of a single vibration system composed of mass m, loss r, and stiffness s, this is the lowest resonance frequency of the diaphragm f ₀ = (1 / 2π) (s / m) ^2/1 (1)
Therefore, it can be said that the stiffness s is added too much.

そこで、振動板の一部だけを補強することで、最低共振周波数の上昇を抑えながら、異常振動を抑える技術が特許公開されている。 In view of this, a technology for suppressing abnormal vibration while reinforcing an increase in the minimum resonance frequency by reinforcing only a part of the diaphragm has been disclosed.

すなわち、特許文献１には振動板のエッジ部に複数本の溝状のリブを一体形成することでスチフネスｓを下げると共に、前記リブの間やそのリブ部を接着剤や粘着剤の塗布により補強することでスチフネスｓを下げた場合の欠点を補完する技術が開示されている。また、特許文献２，３には振動板のドーム部とエッジ部との間を補強剤の塗布や一体形成される補強用リブにより補強する技術が開示されている。さらに、特許文献４にはエッジ部の頂点部を該部に装着する補強手段により補強する技術が開示されている。
特開２００４−４８４９４号公報特開平１０−２５７５８９号公報特開平９−１３５４９１号公報特開平８−１６８０９２号公報 That is, in Patent Document 1, a plurality of groove-shaped ribs are integrally formed at the edge portion of the diaphragm to lower the stiffness s, and between the ribs and the rib portions are reinforced by applying an adhesive or an adhesive. Thus, there is disclosed a technique for compensating for the drawbacks when the stiffness s is lowered. Patent Documents 2 and 3 disclose techniques for reinforcing a diaphragm between a dome portion and an edge portion by applying a reinforcing agent or integrally forming reinforcing ribs. Further, Patent Document 4 discloses a technique for reinforcing the apex portion of the edge portion by means of reinforcing means attached to the portion.
JP 2004-48494 A Japanese Patent Laid-Open No. 10-257589 JP-A-9-135491 Japanese Patent Laid-Open No. 8-168092

しかしながら、特許文献１の技術は前記のリブ付き振動板でしか実施できない上に、特許文献２，３，４の技術のように振動板の補強を一周全体にわたって均一に、かつ、簡単な処理操作で行えないこともあって採用し難い。 However, the technique of Patent Document 1 can be implemented only with the above-described diaphragm with ribs, and the reinforcement of the diaphragm is uniform over the entire circumference and simple processing operation as in the techniques of Patent Documents 2, 3, and 4. It is difficult to adopt because there are things that can not be done.

特許文献２，３の技術はエッジ部のドーム側端部を部分的に補強する技術、また、特許文献４はエッジ部の頂点部を部分的に補強する技術であるが、エッジ部はその構造上、ドーム側端部と頂点部は相反する方向に湾曲する小半径の湾曲部であるため、これらドーム側端部と頂点部の剛性はこの間の部分よりも高い。そのため、振動板の異常振動を効果的に抑えることができない。また、エッジ部のドーム側端部と頂点部の間の曲がり易い部分に応力を集中させ、振動板の異常振動を逆に助長させる虞があった。 The techniques of Patent Documents 2 and 3 are techniques to partially reinforce the dome side end of the edge part, and Patent Document 4 is a technique to partially reinforce the apex part of the edge part. Since the dome side end portion and the vertex portion are small radius curved portions that curve in opposite directions, the rigidity of the dome side end portion and the vertex portion is higher than the portion between them. Therefore, the abnormal vibration of the diaphragm cannot be effectively suppressed. In addition, there is a possibility that stress is concentrated on an easily bent portion between the dome side end portion and the apex portion of the edge portion, and reverse vibration of the diaphragm is promoted.

本発明は上記の実情に鑑みてなされたもので、その目的は、特定のスピーカ用振動板だけでなく、あらゆるスピーカ用振動板に簡単に実施でき、その振動板の最低共振周波数の上昇を確実に抑えながら、その振動板の異常振動を効果的に抑え、音響性能が向上されたスピーカ用振動板及びスピーカを提供することにある。 The present invention has been made in view of the above circumstances, and the object thereof can be easily implemented not only on a specific speaker diaphragm but also on any speaker diaphragm, and reliably increasing the minimum resonance frequency of the diaphragm. It is an object to provide a speaker diaphragm and a speaker with improved acoustic performance by effectively suppressing abnormal vibration of the diaphragm.

上記の目的を達成するために、本発明のスピーカ用振動板は、請求項１に記載したように、樹脂フィルムからなり、上方に膨らんだ形状のドーム部と、そのドーム部の周辺に一体に形成された上方に膨らんだ形状のエッジ部とを備えたスピーカ用振動板において、前記エッジ部のドーム部側端縁から頂点部の間に厚さを他の部分よりも厚くした環状の補強部を備えたことを特徴とする。 In order to achieve the above object, the speaker diaphragm of the present invention is made of a resin film as described in claim 1, and is integrally formed on the periphery of the dome with a swelled upward shape. An annular reinforcing portion having a thicker thickness than the other portions between a dome portion side edge and an apex portion of the edge portion in a speaker diaphragm having an edge portion formed to bulge upward. It is provided with.

また、本発明のスピーカは、請求項９に記載したように、請求項１に記載した振動板と、その振動板のドーム部とエッジ部の間の境界部に一端部を接合するボイスコイルと、そのボイスコイルを駆動する磁気回路とを備えたことを特徴とする。 According to a ninth aspect of the present invention, there is provided a speaker according to the ninth aspect, wherein the diaphragm according to the first aspect and a voice coil having one end joined to a boundary portion between the dome portion and the edge portion of the diaphragm. And a magnetic circuit for driving the voice coil.

本発明のスピーカ用振動板及びスピーカにおいては、振動板のエッジ部のドーム部側端縁から頂点部の間に厚さを他の部分よりも厚くした環状の補強部を備えるので、振動板のエッジ部のドーム部側端縁から頂点部の間の曲がり易い部分が効果的に補強でき、また、一周全体にわたって均一に、かつ、簡単な処理操作で補強できる。すなわち、振動板の異常振動を抑えるのに必要なスチフネスｓを振動板に過不足なく効率的に付加できる。加えて、エッジ部はドーム部をヨークフレームに弾性変位可能に支持するバネと見ることができ、エッジ部のドーム部側端縁から頂点部の間を補強することは、その補強部が中間支点の役目を果たし、バネ有効長を短縮したのと同様で、振動板の振幅偏倚を小さくすることができる。このような２つの相乗作用の結果、振動板の最低共振周波数の上昇を確実に抑えながら、その振動板の異常振動を効果的に抑えることができる。 In the speaker diaphragm and the speaker according to the present invention, the diaphragm includes an annular reinforcing portion having a thickness larger than that of the other portion between the edge portion of the edge portion of the diaphragm and the apex portion. The easily bent portion between the dome portion side edge of the edge portion and the apex portion can be effectively reinforced, and the entire circumference can be reinforced uniformly and with a simple processing operation. That is, the stiffness s necessary for suppressing the abnormal vibration of the diaphragm can be efficiently added to the diaphragm without excess or deficiency. In addition, the edge part can be seen as a spring that supports the dome part to the yoke frame so as to be elastically displaceable. Reinforcing between the edge part of the edge part from the dome part side edge is the intermediate fulcrum. In the same way as the effective length of the spring is shortened, the amplitude deviation of the diaphragm can be reduced. As a result of these two synergistic actions, abnormal vibration of the diaphragm can be effectively suppressed while reliably suppressing an increase in the minimum resonance frequency of the diaphragm.

本発明のスピーカ用振動板及びスピーカにおいては、好ましくは、前記補強部とエッジ部のドーム部側端縁及び頂点部との間に隙間を設ける（請求項２）。この隙間は略同じ隙間がより好ましく（請求項３）、また、前記補強部と前記隙間の半径方向の幅寸法が略同じであることがさらに好ましい（請求項４）。このようにすると、エッジ部のドーム部側端部でも頂点部でもない最も曲がり易い部分をより小さい補強部でより効果的に補強できる。すなわち、最低限のスチフネスｓの付加で振動板の異常振動を抑えることができ、振動板の最低共振周波数の上昇をより確実に抑えことができる。 In the speaker diaphragm and the speaker of the present invention, preferably, a gap is provided between the reinforcing portion and the dome portion side edge and the apex portion of the edge portion. The gaps are more preferably substantially the same gap (Claim 3), and more preferably, the reinforcing portion and the gap have substantially the same radial width dimension (Claim 4). If it does in this way, the part which is neither the dome part side edge part of an edge part nor a vertex part, and can bend most easily can be reinforced more effectively with a smaller reinforcement part. That is, the abnormal vibration of the diaphragm can be suppressed with the addition of the minimum stiffness s, and the increase in the minimum resonance frequency of the diaphragm can be more reliably suppressed.

また、前記補強部は振動板と一体成形により形成することで（請求項５）、振動板の成形と同時に補強部が形成されるので、振動系の組み立て及びその振動系を備えたスピーカの組み立てが従来と同様の工程及び作業で行うことができる。 In addition, since the reinforcing portion is formed by integral molding with the diaphragm (Claim 5), the reinforcing portion is formed simultaneously with the molding of the diaphragm, so that the assembly of the vibration system and the assembly of the speaker including the vibration system are performed. Can be performed by the same processes and operations as in the prior art.

また、前記補強部は環状に形成された薄膜を貼リ付けて形成することで（請求項６）、振動板に補強部を後付けする場合に、その処理操作を簡単に行うことができる。さらに、前記薄膜を載頭円錐状に形成することで（請求項７）、薄膜を振動板に貼り付ける際の位置決めがより簡単に行うことができ、振動板に補強部を後付けする場合に、その処理操作をより簡単に行うことができる。 Further, the reinforcing portion is formed by sticking an annularly formed thin film (Claim 6), so that when the reinforcing portion is retrofitted to the diaphragm, the processing operation can be easily performed. Furthermore, by forming the thin film in a conical shape (Claim 7), positioning when attaching the thin film to the diaphragm can be performed more easily, and when a reinforcing portion is retrofitted to the diaphragm, The processing operation can be performed more easily.

さらに、前記補強部は補強剤の塗布により形成することで、補強剤が振動系の質量ｍを増大させ、また、その調整も利いて簡単に行うことができる。その結果、振動板の過不足のない適正で効率的なスチフネスｓの付加と質量ｍの付加により、振動板の最低共振周波数の上昇をさらに確実に抑えことができる。 Furthermore, the reinforcing part is formed by applying a reinforcing agent, so that the reinforcing agent increases the mass m of the vibration system, and the adjustment can be easily performed. As a result, the increase in the minimum resonance frequency of the diaphragm can be more reliably suppressed by adding the proper and efficient stiffness s and the mass m without excess or deficiency of the diaphragm.

以上から明らかなように本発明は、特定のスピーカ用振動板だけでなく、あらゆるスピーカ用振動板に簡単に実施でき、その振動板の最低共振周波数の上昇を確実に抑えながら、その振動板の異常振動を効果的に抑え、音響性能が向上されたスピーカ用振動板及びスピーカを提供することができた。 As is clear from the above, the present invention can be easily implemented not only on a specific speaker diaphragm but also on any speaker diaphragm, while reliably suppressing an increase in the minimum resonance frequency of the diaphragm. It was possible to provide a speaker diaphragm and a speaker in which abnormal vibration was effectively suppressed and acoustic performance was improved.

以下、本発明の実施の形態について図面を参照して説明する。図１は本発明に係る小型スピーカ１の実施の形態を示す断面図であり、図４の従来の小型スピーカ１０と同じ部分には同一符号を付してその説明を省略する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a small speaker 1 according to the present invention. The same parts as those of the conventional small speaker 10 of FIG.

本実施の形態の小型スピーカ１の振動板６には、そのエッジ部６ｂのドーム部側端縁から頂点部の間に厚さを他の部分よりも厚くした環状の補強部８を備える。 The diaphragm 6 of the small speaker 1 of the present embodiment includes an annular reinforcing portion 8 having a thickness larger than that of the other portions between the edge portion 6b edge of the edge portion 6b and the apex portion.

本実施の形態では、図２のエッジ部６ｂの拡大図に示すように、エッジ部６ｂのドーム部側端縁と頂点部との間を半径方向にＡ，Ｂ，Ｃの３つの部分に分け、エッジ部６ｂのドーム部側端縁部に相当するＡ部と頂点部に相当するＣ部との間のＢ部、すなわち、エッジ部６ｂのドーム部側端縁部でも頂点部でもない中間部に環状の前記補強部８を備える。このため、前記補強部８とエッジ部６ｂのドーム部側端縁との間には前記Ａ部に相当する隙間Ｄ１が設けられ、また、前記補強部８とエッジ部６ｂの頂点部との間には前記Ｃ部に相当する隙間Ｄ２が設けられる。 In the present embodiment, as shown in the enlarged view of the edge portion 6b in FIG. 2, the space between the edge of the edge portion 6b on the dome side and the apex portion is divided into three portions A, B, and C in the radial direction. , B part between the A part corresponding to the edge part on the dome part side of the edge part 6b and the C part corresponding to the vertex part, that is, the intermediate part which is neither the dome part side edge part nor the vertex part of the edge part 6b The annular reinforcing portion 8 is provided. For this reason, a gap D1 corresponding to the A portion is provided between the reinforcing portion 8 and the edge on the dome portion side of the edge portion 6b, and between the reinforcing portion 8 and the apex portion of the edge portion 6b. Is provided with a gap D2 corresponding to the C portion.

本実施の形態ではまた、前記各隙間Ｄ１，Ｄ２はそれぞれの半径方向の幅寸法が略同じになるように設けられる。さらに、前記補強部８と前記各隙間Ｄ１，Ｄ２のそれぞれの半径方向の幅寸法が略同じになるように設けられる。すなわち、補強部８は、エッジ部６ｂのドーム部側端縁と頂点部との間を半径方向にＡ，Ｂ，Ｃの３つに３等分し、そのＡ部とＣ部との間のＢ部に備える。 In the present embodiment, the gaps D1 and D2 are provided so that their radial width dimensions are substantially the same. Further, the reinforcing portion 8 and the gaps D1, D2 are provided so that the radial width dimensions thereof are substantially the same. That is, the reinforcing portion 8 divides the space between the edge portion 6b edge of the edge portion 6b and the apex portion into three equal parts A, B, and C in the radial direction, and between the A portion and the C portion. Prepare for part B.

本実施の形態ではさらに、振動板６を形成する樹脂フィルムよりもさらに薄い樹脂フィルムからなり、環状に形成され、かつ、エッジ部６ｂのＢ部の傾斜に沿う角度を予め付けた載頭円錐状の薄膜（補強部材）９を、接着剤や粘着剤を使用してエッジ部６ｂのＢ部の表面に貼リ付けることで、前記補強部８を形成する。 In the present embodiment, it is further formed of a resin film that is thinner than the resin film forming the diaphragm 6, is formed in an annular shape, and has a conical shape with an angle along the inclination of the B portion of the edge portion 6b. The thin film (reinforcing member) 9 is adhered to the surface of the B part of the edge part 6b using an adhesive or a pressure-sensitive adhesive, thereby forming the reinforcing part 8.

本実施の形態のスピーカ用振動板６及びその振動板６を備えたスピーカ１においては、振動板６のエッジ部６ｂのドーム部側端縁から頂点部の間に厚さを他の部分よりも厚くした環状の補強部８を備えるので、振動板６のエッジ部６ｂのドーム部側端縁から頂点部の間の曲がり易い部分（Ｂ部）を効果的に補強できる。また、一周全体にわたって均一に補強できる。すなわち、振動板６の異常振動を抑えるのに必要なスチフネスｓを振動板６に過不足なく効率的に付加できる。加えて、エッジ部６ｂはドーム部６ａをヨークフレーム２に弾性変位可能に支持するバネと見ることができ、エッジ部６ｂのドーム部側端縁から頂点部の間を補強することは、その補強部８が中間支点の役目を果たし、バネ有効長を短縮したのと同様で、振動板６の最大振幅と最小振幅の差である振幅偏倚（図３）を小さくすることができる。このような２つの相乗作用の結果、振動板６の最低共振周波数の上昇を確実に抑えながら、その振動板６の異常振動を効果的に抑えることができる。 In the speaker diaphragm 6 of the present embodiment and the speaker 1 including the diaphragm 6, the thickness between the edge portion 6b edge of the diaphragm 6b and the apex portion is larger than that of the other portions. Since the thickened annular reinforcing portion 8 is provided, it is possible to effectively reinforce a portion (B portion) that is easily bent from the dome portion side edge of the edge portion 6b of the diaphragm 6 to the apex portion. Moreover, it can reinforce uniformly over the whole circumference. That is, the stiffness s necessary for suppressing the abnormal vibration of the diaphragm 6 can be efficiently added to the diaphragm 6 without excess or deficiency. In addition, the edge portion 6b can be regarded as a spring that supports the dome portion 6a on the yoke frame 2 so as to be elastically displaceable. Reinforcing between the dome portion side edge of the edge portion 6b and the apex portion is a reinforcement thereof. As in the case where the portion 8 serves as an intermediate fulcrum and the effective spring length is shortened, the amplitude deviation (FIG. 3) which is the difference between the maximum amplitude and the minimum amplitude of the diaphragm 6 can be reduced. As a result of such two synergistic actions, abnormal vibration of the diaphragm 6 can be effectively suppressed while reliably suppressing an increase in the minimum resonance frequency of the diaphragm 6.

本実施の形態のスピーカ用振動板６及びその振動板６を備えたスピーカ１においてはまた、前記補強部８とエッジ部６ｂのドーム部側端縁及び頂点部との間に隙間Ｄ１，Ｄ２を設け、この各隙間Ｄ１，Ｄ２は略同じ隙間であって、しかも、前記補強部８と前記各隙間Ｄ１，Ｄ２の半径方向の幅寸法が略同じである。これにより、エッジ部６ｂのドーム部側端部（Ａ部）でも頂点部（Ｃ部）でもない最も曲がり易い部分（Ｂ部）をより小さい補強部８でより効果的に補強できる。すなわち、最低限のスチフネスｓの付加で振動板６の異常振動を抑えることができ、振動板６の最低共振周波数の上昇をより確実に抑えことができる。また、前記補強部５は振動板６のエッジ部６ｂのドーム部側端縁から頂点部の間の曲がり易い部分（Ｂ部）の厚さを一周全体にわたって他の部分よりも厚くするもので、前記補強部８は環状に形成された薄膜（補強部材）９を貼リ付けることで簡単に形成できる。さらに、前記薄膜９を載頭円錐状に形成するので、薄膜９を振動板６に貼り付ける際の位置決めがより簡単に行うことができる。この結果、振動板６に補強部８を後付けする場合に、その処理操作を簡単に行うことができる。すなわち、本発明を従来の振動板に簡単に実施できる。 In the speaker diaphragm 6 of the present embodiment and the speaker 1 including the diaphragm 6, gaps D1 and D2 are provided between the reinforcing portion 8 and the dome side edge and the vertex portion of the edge portion 6b. The gaps D1 and D2 are substantially the same, and the radial widths of the reinforcing portion 8 and the gaps D1 and D2 are substantially the same. Thereby, the most bendable part (B part) which is neither the dome part side end part (A part) nor the apex part (C part) of the edge part 6b can be more effectively reinforced by the smaller reinforcing part 8. That is, the abnormal vibration of the diaphragm 6 can be suppressed with the addition of the minimum stiffness s, and the increase in the minimum resonance frequency of the diaphragm 6 can be more reliably suppressed. Further, the reinforcing portion 5 is configured to make the thickness of the portion (B portion) that is easy to bend from the edge on the dome portion side of the edge portion 6b of the diaphragm 6 to be thicker than the other portions over the entire circumference. The reinforcing portion 8 can be easily formed by attaching a thin film (reinforcing member) 9 formed in an annular shape. Further, since the thin film 9 is formed in a conical shape, positioning when the thin film 9 is attached to the diaphragm 6 can be performed more easily. As a result, when the reinforcing portion 8 is retrofitted to the diaphragm 6, the processing operation can be easily performed. That is, the present invention can be easily implemented on a conventional diaphragm.

ところで、前記補強部８は振動板６の成形時にそれと一体成形により形成してもよい。この場合には、振動板８の成形と同時に補強部８が形成されるので、振動系（振動板６とボイスコイル７）の組み立て及びその振動系を備えたスピーカ１の組み立てが従来と同様の工程及び作業で行うことができる。 By the way, the reinforcing portion 8 may be formed by integral molding with the diaphragm 6 at the time of molding. In this case, since the reinforcing portion 8 is formed simultaneously with the formation of the diaphragm 8, the assembly of the vibration system (the vibration plate 6 and the voice coil 7) and the assembly of the speaker 1 including the vibration system are the same as in the prior art. It can be performed in the process and operation.

また、前記補強部８は接着剤や粘着剤等の補強剤の塗布により形成してもよい。この場合には、補強剤が振動系の質量ｍを増大させ、また、その調整も利いて簡単に行うことができる。その結果、振動板８の過不足のない適正で効率的なスチフネスｓの付加と質量ｍの付加により、振動板６の最低共振周波数の上昇をさらに確実に抑えことができる。 The reinforcing portion 8 may be formed by applying a reinforcing agent such as an adhesive or a pressure-sensitive adhesive. In this case, the reinforcing agent increases the mass m of the vibration system, and the adjustment can be easily performed. As a result, the increase in the minimum resonance frequency of the diaphragm 6 can be more reliably suppressed by adding the appropriate and efficient stiffness s and the mass m without excess or deficiency of the diaphragm 8.

次に、シミュレーションによる振動板振動状態解析結果を以下の表１，２，３に示す。表１は従来のスピーカの振動板の場合、表２は振動板全体を厚くした場合、表３は振動板のエッジ部の一部を厚くした場合を示す。このシミュレーションは次の条件で実施した。
・シミュレーションソフト：ＡＮＳＹＳＶｅｒ.７.０
・振動板径：Ф１０ｍｍ
・総メッシュ数：１６９４５
・解析条件：振動板は周辺固定。
ボイスコイル部に０．０８Ｎの力を加えて振動板を駆動。 Next, the vibration state analysis results of the diaphragm by simulation are shown in Tables 1, 2, and 3 below. Table 1 shows a conventional speaker diaphragm, Table 2 shows a case where the entire diaphragm is thickened, and Table 3 shows a case where a part of an edge portion of the diaphragm is thickened. This simulation was performed under the following conditions.
・ Simulation software: ANSYS Ver. 7.0
-Diaphragm diameter: Ф10mm
・ Total number of meshes: 16945
-Analysis conditions: The diaphragm is fixed at the periphery.
Driving the diaphragm by applying 0.08N force to the voice coil.

以上から明らかなように、従来のスピーカ１０の振動板６に比べて、振動板６全体の厚さを厚くした場合には、振幅偏倚は小さくなるものの、同時に最低共振周波数も大きく上昇している。また、振動板６のエッジ部６ｂのＡ部の厚さを他の部分より厚くした場合には、最低共振周波数の上昇は殆ど見られないものの、振幅偏倚は小さくなるどころか逆に上昇している。さらに、振動板６のエッジ部６ｂのＣ部の厚さを他の部分より厚くした場合には、最低共振周波数の上昇は殆ど見られないものの、振幅偏倚も殆ど変化がなく小さくなっていない。これに対し、振動板６のエッジ部６ｂのＢ部の厚さを他の部分より厚くした場合には、すなわち、本実施の形態のスピーカ用振動板６及びスピーカ１によれば、スチフネスｓを下げる特定のリブやそのリブを設けたことによる欠点を補完する調整部材等を設けなくとも、環状の補強部８のみで、最低共振周波数の上昇を抑えながら、振幅偏倚を小さくすることができた。すなわち、振動板６の異常振動を抑えることができた。 As is clear from the above, when the thickness of the entire diaphragm 6 is increased compared to the diaphragm 6 of the conventional speaker 10, the amplitude deviation is reduced, but at the same time, the minimum resonance frequency is also greatly increased. . Further, when the thickness of the A portion of the edge portion 6b of the diaphragm 6 is made thicker than other portions, the minimum resonance frequency is hardly increased, but the amplitude deviation is increased rather than reduced. . Further, when the thickness of the C portion of the edge portion 6b of the diaphragm 6 is made thicker than other portions, the increase in the minimum resonance frequency is hardly observed, but the amplitude deviation is hardly changed and is not reduced. On the other hand, when the thickness of the portion B of the edge portion 6b of the diaphragm 6 is made thicker than other portions, that is, according to the speaker diaphragm 6 and the speaker 1 of the present embodiment, the stiffness s is reduced. Even without providing a specific rib to be lowered or an adjustment member that compensates for the disadvantages due to the provision of the rib, the amplitude deviation can be reduced while suppressing an increase in the minimum resonance frequency with only the annular reinforcing portion 8. . That is, the abnormal vibration of the diaphragm 6 could be suppressed.

尚、本実施の形態では振動板６の表面に補強部８を備えたが、ボイスコイル７を接合させる裏面に備えても同様の作用効果をえることができる。また、本実施の形態で示したスピーカ１の振動板構造はマイクロフォンの振動板に適用しても同様の作用効果を発揮し、その音響性能を向上させることができる。 In the present embodiment, the reinforcing portion 8 is provided on the surface of the diaphragm 6. However, the same effect can be obtained by providing the reinforcing portion 8 on the back surface to which the voice coil 7 is joined. Further, the diaphragm structure of the speaker 1 shown in the present embodiment can exhibit the same operational effects even when applied to a diaphragm of a microphone, and can improve its acoustic performance.

本発明に係る小型スピーカの実施の形態を示す断面図である。It is sectional drawing which shows embodiment of the small speaker which concerns on this invention. 図１に示した小型スピーカに備える振動板のエッジ部の拡大図である。It is an enlarged view of the edge part of the diaphragm with which the small speaker shown in FIG. 1 is equipped. 振動板の振動状態解析モデル図である。It is a vibration state analysis model figure of a diaphragm. 従来の小型スピーカの構造を示す断面図である。It is sectional drawing which shows the structure of the conventional small speaker.

Explanation of symbols

１小型スピーカ
２ヨークフレーム
３マグネット
４トッププレート
５磁気回路
６振動板
６ａドーム部
６ｂエッジ部
７ボイスコイル
８補強部
９薄膜（補強部材）
Ｄ１，Ｄ２隙間 DESCRIPTION OF SYMBOLS 1 Small speaker 2 Yoke frame 3 Magnet 4 Top plate 5 Magnetic circuit 6 Diaphragm 6a Dome part 6b Edge part 7 Voice coil 8 Reinforcement part 9 Thin film (reinforcement member)
D1, D2 gap

Claims

A speaker diaphragm comprising a resin film and having a dome shape that swells upward, and an edge portion that swells upward and is integrally formed around the dome portion. A loudspeaker diaphragm comprising a ring-shaped reinforcing portion having a thickness larger than that of other portions between a side edge and a vertex portion.

The speaker diaphragm according to claim 1, wherein a gap is provided between the reinforcing portion and a dome portion side edge and an apex portion of the edge portion.

The speaker diaphragm according to claim 1, wherein substantially the same gap is provided between the reinforcing portion and the edge on the dome portion side and the apex portion of the edge portion.

The diaphragm for a speaker according to claim 2 or 3, wherein a width dimension in a radial direction of the reinforcing portion and the gap is substantially the same.

The speaker diaphragm according to any one of claims 1 to 4, wherein the reinforcing portion is formed by integral molding with the diaphragm.

The speaker diaphragm according to claim 1, wherein the reinforcing portion is formed by attaching a thin film formed in an annular shape.

The speaker diaphragm according to claim 6, wherein the thin film is formed in a conical shape.

The speaker diaphragm according to claim 1, wherein the reinforcing portion is formed by applying a reinforcing agent.

A diaphragm according to any one of claims 1 to 8, a voice coil having one end joined to a boundary portion between a dome portion and an edge portion of the diaphragm, and a magnetic circuit for driving the voice coil. A speaker characterized by that.