201004392 六、發明說明： 【發明所屬之技術領域】 本發明’係有關於在行動電話等之中所使用的小型、 薄型之揚聲器。 【先前技術】 從先前起’在磁性迴路中使用有塑膠磁鐵的揚聲器（ 動態型揚聲器），例如係藉由專利文獻1等而爲週知。但 是’若是針對磁性迴路之構件構成以及組裝來作觀察，則 係與使用有一般（鐵氧體、鋁-鎳-鈷、稀土類等）之金屬 系磁鐵的揚聲器爲相同。磁性迴路，係無關於磁鐵之種類 ’而爲將磁鐵與軛以及磁極片之3個構件作接著並組裝者 〇 [專利文獻1]日本特開2000-32589號公報 【發明內容】 [發明所欲解決之課題] 在先前技術之揚聲器中，於磁性迴路之組裝中所使用 的接著劑所造成之影響係爲非常大，而有著難以將量產性 提升之課題。 本發明，係爲有鑑於上述課題而進行者’其目的’係 在於利用能夠簡單地加工爲所期望之形狀的塑膠磁鐵之特 性，而提供一種量產性高且爲小型、薄型的揚聲器。 201004392 [用以解決課題之手段] 爲了達成上述目的，本發明，係爲一種具備有磁性迴 路、和在音圈處附加有振動板之振動系、和將此些之磁性 迴路與振動系作支持之框架，並將前述音圈配置在磁隙中 所成的揚聲器，其特徵爲：將前述磁性迴路，藉由剖面T 字形之塑膠磁鐵、和在前述塑膠磁鐵之底部側以及周圍處 而連續設置的軛來構成。藉由此，而使磁鐵本身具備有磁 極片之功用，相較於3件式構造之先前技術的磁性迴路， 係爲省空間，而能夠使用更大體積之磁鐵，故而，在提升 音圈之驅動力的同時，亦將先前技術之3件式構造的磁性 迴路作成2件式構造，亦即是，係將構件數量作了削減。 在本發明中，較理想，係將前述塑膠磁鐵之頂面形成 爲凹面，而將前述振動板之中央部形成爲逆圓頂狀。 在本發明中，較理想，係設置從位於前述塑膠磁鐵之 底部側處的前述軛起而藉由突出成形工程所立起了的筒部 、和將前述筒部貫通至前述塑膠磁鐵之中心部處的貫通孔 ，並經由對前述筒部之前端部進行壓潰加工，來將前述塑 膠磁鐵與前述軛作結合。 [發明之效果] 若藉由本發明，則由於係將磁性迴路藉由剖面T字形 之塑膠磁鐵和在前述塑膠磁鐵之底部側以及周圍處而連續 設置的軛所構成，因此，經由將先前技術之3件式構造的 磁性迴路之構件數量作削減，而能夠將小型、薄型之揚聲 -6- 201004392 器的量產性提升。 在本發明中，由於係將前述塑膠磁鐵之頂面形成爲凹 面’而將前述振動板之中央部形成爲逆圓頂狀，因此，能 多句確保振動系之充分的振幅，而能夠並不使音響性能劣化 地來實現小型、薄型之揚聲器的更進一步之薄型化。 在本發明中，由於係設置從位於前述塑膠磁鐵之底部 彻j處的前述軛起而藉由突出成形工程所立起了的筒部、和 將前述筒部貫通至前述塑膠磁鐵之中心部處的貫通孔，並 經由對前述筒部之前端部進行壓潰加工，來將前述塑膠磁 鐵與前述軛作結合，因此，在磁性迴路之組裝中，係並不 需要使用接著劑，而能夠將小型、薄型之揚聲器的量產性 更進一步的提升。 【實施方式】 以下，根據圖面，對於本發明之實施形態作說明。圖 1 ’係爲本發明之實施形態的揚聲器之剖面圖，圖2，係爲 )1夺本發明之實施形態的揚聲器之振動板作了透明化後之平 面圖。 於圖1、2中所示之揚聲器1，係藉由以磁性材料所形 成之軛一體型的框架2、和磁性迴路3、以及振動系4所構 成。 框架2，係被形成有高度低之有底圓筒狀，並具備有 圓形之底板5、和從底板5之外周邊緣所立起的外壁6。在 外壁6處’係設置水平之階段差面7，並經由階段差面7, 201004392 而將外壁6之上部形成爲較下部更爲大口徑。 從底板5起，係被立起有軛側壁8 ’該鞭側壁8是設置 有特定之空隙而與外壁6之下部相對向的內壁’藉由妮側 壁8、和位在軛側壁8之內側的底板5之中央部所成的圓形 之軛底板9，而形成高度較框架2更低的有底圓筒狀之輒10 〇 在軛側壁8之左右兩場所處，設置將飯側壁8 一直切缺 至下端處之一對的導線拉出口 11’並在位於導線拉出位置 之底部側的底板5處，設置導線成形夾具***用之一對的 圓孔1 2，同時，在位於外壁6與軛側壁8之間的底板5之外 側部處，於導線拉出位置以外之底部側的底板5處’設置 略半圓弧狀之一對的背面音孔1 3。圖2之上側的背面音孔 13，係從底板5起而將外壁6之下部與階段差面7連續性地 開口。 在圖2之上側被背面音孔1 3所開口的階段差面7之背面 側處，係被固定有將內周邊緣抵接於軛側壁8處之略半^ ® 弧狀的絕緣性之端子板14，並在經由端子板I4而將—對之 外部連接端子（省略圖示）安裝於揚聲器1之背面_ &胃 時，將與外部連接端子相互導通之一對的導線接觸墊# $ 1 5露出形成於端子板1 4之兩端部表面，而經由圖2之上側 的背面音孔13來使導線接觸墊片部15在框架2內露出° 磁性迴路3，係藉由塑膠磁鐵16與軛10所構成。201004392 VI. Description of the Invention: [Technical Field] The present invention relates to a small, thin speaker used in a mobile phone or the like. [Prior Art] A speaker (dynamic type speaker) using a plastic magnet in the magnetic circuit has been known from the prior art, for example, by Patent Document 1. However, if it is observed for the structure and assembly of the magnetic circuit, it is the same as that of a metal-based magnet using a general (ferrite, aluminum-nickel-cobalt, rare earth, etc.). The magnetic circuit is a type in which the magnet is connected to the yoke and the magnetic pole piece without being related to the type of the magnet. [Patent Document 1] Japanese Laid-Open Patent Publication No. 2000-32589. Problem to be Solved] In the speaker of the prior art, the influence of the adhesive used in the assembly of the magnetic circuit is very large, and it is difficult to increase the mass productivity. The present invention has been made in view of the above problems. The object of the present invention is to provide a speaker having a high mass productivity and a small size and a thin shape by utilizing the characteristics of a plastic magnet that can be easily processed into a desired shape. 201004392 [Means for Solving the Problem] In order to achieve the above object, the present invention is a vibration system including a magnetic circuit and a vibrating plate attached to a voice coil, and supporting the magnetic circuit and the vibration system. a frame and a speaker formed by disposing the voice coil in a magnetic gap, wherein the magnetic circuit is continuously disposed by a plastic magnet having a T-shaped cross section and at a bottom side and a periphery of the plastic magnet The yoke comes to form. Thereby, the magnet itself is provided with the function of the pole piece, and compared with the prior art magnetic circuit of the 3-piece structure, the space is saved, and a larger volume of magnet can be used, so that the voice coil is raised. At the same time as the driving force, the magnetic circuit of the prior art three-piece structure is also constructed in a two-piece configuration, that is, the number of components is reduced. In the invention, it is preferable that the top surface of the plastic magnet is formed into a concave surface, and the central portion of the vibrating plate is formed in an inverted dome shape. In the present invention, it is preferable to provide a cylindrical portion that is raised from the yoke located at the bottom side of the plastic magnet and that is raised by the protrusion forming process, and that penetrates the cylindrical portion to the center portion of the plastic magnet. The through hole is placed, and the plastic magnet is coupled to the yoke by crushing the front end portion of the tubular portion. [Effects of the Invention] According to the present invention, since the magnetic circuit is constituted by a plastic magnet having a T-shaped cross section and a yoke which is continuously provided on the bottom side and the periphery of the plastic magnet, the prior art is The number of components of the three-piece magnetic circuit is reduced, and the mass production of the small and thin speaker 6-201004392 can be improved. In the present invention, since the center surface of the vibrating plate is formed in a concave shape by forming the top surface of the plastic magnet into a concave surface, it is possible to ensure a sufficient amplitude of the vibration system in a plurality of sentences, and it is possible to The acoustic performance is degraded to further reduce the thickness of the small and thin speaker. In the present invention, the cylindrical portion which is raised by the protrusion forming process from the yoke located at the bottom of the plastic magnet, and the cylindrical portion are penetrated to the central portion of the plastic magnet The through hole is pressed to the front end portion of the tubular portion to bond the plastic magnet to the yoke. Therefore, in the assembly of the magnetic circuit, it is possible to reduce the size without using an adhesive. The mass production of thin speakers has been further improved. [Embodiment] Hereinafter, embodiments of the present invention will be described based on the drawings. Fig. 1 is a cross-sectional view showing a speaker according to an embodiment of the present invention, and Fig. 2 is a plan view showing a vibrating plate of a speaker according to an embodiment of the present invention. The speaker 1 shown in Figs. 1 and 2 is composed of a yoke-integrated frame 2 made of a magnetic material, a magnetic circuit 3, and a vibration system 4. The frame 2 is formed into a bottomed cylindrical shape having a low height, and is provided with a circular bottom plate 5 and an outer wall 6 which rises from the outer peripheral edge of the bottom plate 5. At the outer wall 6, a horizontal step surface 7 is provided, and the upper portion of the outer wall 6 is formed to have a larger diameter than the lower portion via the step surface 7, 201004392. From the bottom plate 5, the yoke side wall 8 is erected. The whip side wall 8 is an inner wall which is provided with a specific gap and faces the lower portion of the outer wall 6 by the Ni side wall 8 and on the inner side of the yoke side wall 8. The circular yoke bottom plate 9 formed in the central portion of the bottom plate 5 forms a bottomed cylindrical shape 10 高度 lower than the frame 2, and is disposed at the left and right places of the yoke side wall 8 to provide the rice side wall 8 The wire pulling outlet 11' is cut to one of the pair at the lower end and the wire forming jig is inserted into the circular hole 12 of one pair at the bottom plate 5 on the bottom side of the wire drawing position, while being located at the outer wall 6 At the outer side portion of the bottom plate 5 between the yoke side wall 8 and the bottom plate 5 on the bottom side other than the wire drawing position, a pair of rear sound holes 13 of a pair of arcuate shapes are disposed. The back sound hole 13 on the upper side of Fig. 2 is opened from the bottom plate 5 to continuously open the lower portion of the outer wall 6 from the step surface 7. On the back side of the step surface 7 opened by the back sound hole 13 on the upper side of Fig. 2, an insulating terminal which abuts the inner peripheral edge to the side wall 8 of the yoke 8 is fixed. The plate 14 is connected to the wire contact pad of the pair of external connection terminals by a pair of external connection terminals (not shown) mounted on the back surface of the speaker 1 via the terminal block I4. 1 5 is exposed on the surface of both end portions of the terminal block 14 , and the wire contact pad portion 15 is exposed in the frame 2 via the rear sound hole 13 on the upper side of FIG. 2 . The magnetic circuit 3 is formed by the plastic magnet 16 . It is composed of a yoke 10.
塑膠磁鐵16，係被成形爲具有與軛側壁8略相同 度，且具備有較軛側壁8之內徑而略小之直徑的外彳至之· W -8- 201004392 柱狀，並在軛底板9之上以同心狀而被作配置，而在軛側 壁8之上部內周面處，隔著磁隙17而與塑膠磁鐵16之上部 外周面相對向。 於此，利用能夠簡單地加工爲所期望之形狀的塑膠磁 鐵16之特性，塑膠磁鐵16，係以使上部之直徑成爲較下部 之直徑更大的方式，而被成形爲剖面T字型。藉由此，而 使塑膠磁鐵16之上部相較於下部而更接近於軛側壁8，並 使磁通量集中於磁隙17處。亦即是，塑膠磁鐵16之上部係 發揮磁極片之功效，相較於3件式構造之先前技術的磁性 迴路，係爲省空間，而能夠使用更爲大體積之磁鐵，在能 夠將後述之音圈21的驅動力提升的同時，亦將先前技術中 係爲3件式構造之磁性迴路2件式構造化，亦即是，係將構 件數量作了削減。 又，塑膠磁鐵16之頂面（上面），爲了實現揚聲器1 之更進一步的薄型化，係並非採用平坦面，而形成爲逆圓 頂狀之凹面1 8。 進而，爲了不使用接著劑地來進行塑膠磁鐵16與軛10 之間的結合，而在塑膠磁鐵16之中心部處設置上下貫通之 圓形的貫通孔19，另一方面，在軛底板9之中心部處，藉 由突出成形加工，而使圓筒狀之筒部20立起，在將塑膠磁 鐵裝著於軛10處之時，將筒部20從下側嵌合於貫通孔19中 ，並在塑膠磁鐵16之凹面18的中心部（最深部）處，使筒 部20之前端部朝向上方而突出，再對於筒部20之前端部進 行壓潰加工，藉由此，而將塑膠磁鐵16與軛10作結合並使 201004392 其一體化。 振動系4，係藉由在由金屬或塑膠製之薄膜所形成的 圓筒狀之音圈捲線軸上將導線作捲繞所形成的音圈2 1、和 由金屬或塑膠製之薄膜所形成並在音圈21之上部而以同心 狀來作貼附的圓形之振動板22所構成。 於此，振動板22，爲了實現揚聲器1之更進一步的薄 型化，係並非被形成爲使較音圏2 1之貼附位置更爲內側的 中央部朝向上方膨脹之圓頂狀，而是形成爲朝向下方膨脹 之逆圓頂狀。 而後，將位於振動板22的逆圓頂部23之周圍的圓環狀 之邊緣部24的外周邊緣部之背面，隔著剖面L字型之振動 板環25來接著固定在位於框架2之外側部的外壁6之階段差 面7處，並將音圈2]在磁性迴路3之磁隙17內可上下自由移 動地作配置。 從音圈21之捲繞起始端與捲繞結束端所拉出的導線26 ，係分別從導線拉出口 11而被拉出至軛1〇之外側，並被吊 掛在從框架2之下側而通過圓孔12並***至導線拉出位置 中之圓棒狀的成形夾具處，而被彎折爲略U字狀（成形） ，並被導引至連接對象之導線接觸墊片部1 5處，再將導線 2 6之前端部藉由點狀熔接來連接在連接對象之導線接觸墊 片部1 5處。 如同上述一般而被構成之揚聲器1，若是從外部電路 通過一對之外部連接端子而在音圈21處被輸入有聲音訊號 ，則藉由在磁性迴路3處所產生之磁場以及在音圈2 1處所 -10- 201004392 流動之電流的相互作用，音圈2 1係上下振動，並藉由與其 相連動地而上下振動之振動板22，來使周圍的空氣振動， 並發出聲音。 此時，由於係將磁性迴路3藉由剖面T字型之塑膠磁鐵 16、和在塑膠磁鐵16之底部側以及周圍處而連續設置的軛 1 〇所構成，因此，經由將先前技術之3件式構造的磁性迴 路之構件數量作削減，而能夠將小型、薄型之揚聲器的量 產性提升。 又’由於係將塑膠磁鐵1 6之頂面形成爲凹面1 8，而將 振動板2 2之中央部形成爲逆圓頂狀，因此，能夠確保振動 系4之充分的振幅，而能夠並不使音響性能劣化地來實現 小型、薄型之揚聲器的更進一步之薄型化。 進而，由於係設置從位於塑膠磁鐵1 6之底部側處的軛 10起而藉由突出成形工程所立起了的筒部20、和將筒部20 貫通至塑膠磁鐵1 6之中心部處的貫通孔1 9，並經由對筒部 20之前端部進行壓潰加工，來將塑膠磁鐵16與軛10作結合 ，因此，在磁性迴路3之組裝中，係並不需要使用接著劑 ，而能夠將小型、薄型之揚聲器的量產性更進一步的提升 〇 另外，在本實施形態中，雖係藉由圓形之揚聲器1而 對本發明之其中一種實施形態作了說明，但是，亦可爲角 型之揚聲器。本發明，係並不被限定於本實施形態，在不 脫離該要旨的範圍內，係可進行各種之變形實施。 -11 - 201004392 【圖式簡單說明】 [圖1 ]本發明之其中一種實施形態的揚聲器之剖面圖。 [圖2]本發明之其中一種實施形態的揚聲器之將振動板 作了透明化後的狀態之平面圖。 【主要元件符號說明】 1 :揚聲器 2 :框架 3 :磁性迴路 4 :振動系 1 0 :輒 1 6 :塑膠磁鐵 1 7 :磁隙 18 :凹面 1 9 :貫通孔 20 :筒部 21 :音圈 22 :振動板 23 :逆圓頂部 -12-The plastic magnet 16 is formed to have a degree similar to that of the yoke side wall 8, and has a diameter smaller than the inner diameter of the yoke side wall 8 to the outer diameter of the W -8-201004392 column, and is on the yoke bottom plate. 9 is arranged concentrically, and is opposed to the outer peripheral surface of the upper portion of the plastic magnet 16 via the magnetic gap 17 at the inner peripheral surface of the upper portion of the yoke side wall 8. Here, the plastic magnet 16 is formed into a T-shaped cross section so that the diameter of the upper portion becomes larger than the diameter of the lower portion by the characteristics of the plastic magnet 16 which can be easily processed into a desired shape. Thereby, the upper portion of the plastic magnet 16 is closer to the yoke side wall 8 than the lower portion, and the magnetic flux is concentrated at the magnetic gap 17. That is, the upper portion of the plastic magnet 16 functions as a magnetic pole piece, and the magnetic circuit of the prior art of the three-piece structure is space-saving, and a magnet having a larger volume can be used, which can be described later. While the driving force of the voice coil 21 is increased, the magnetic circuit of the three-piece construction in the prior art is also constructed in two parts, that is, the number of components is reduced. Further, in order to further reduce the thickness of the speaker 1, the top surface (upper surface) of the plastic magnet 16 is formed into a concave-shaped concave surface 18 instead of a flat surface. Further, in order to bond the plastic magnet 16 and the yoke 10 without using an adhesive, a circular through hole 19 penetrating vertically is provided at the center portion of the plastic magnet 16, and on the other hand, the yoke bottom plate 9 is provided. At the center portion, the cylindrical tubular portion 20 is raised by the protrusion forming process, and when the plastic magnet is attached to the yoke 10, the tubular portion 20 is fitted into the through hole 19 from the lower side. At the center portion (the deepest portion) of the concave surface 18 of the plastic magnet 16, the front end portion of the tubular portion 20 is protruded upward, and the front end portion of the tubular portion 20 is crushed, whereby the plastic magnet is thereby obtained. 16 is combined with the yoke 10 and integrated into 201004392. The vibration system 4 is formed by a voice coil 2 1 formed by winding a wire on a cylindrical voice coil bobbin formed of a film made of metal or plastic, and a film made of metal or plastic. The circular vibrating plate 22 is attached to the upper portion of the voice coil 21 in a concentric manner. Here, in order to further reduce the thickness of the speaker 1 , the diaphragm 22 is formed not in a dome shape in which the center portion of the inner side of the attachment portion 21 is expanded upward, but is formed in a dome shape. It is an inverted dome shape that expands downward. Then, the back surface of the outer peripheral edge portion of the annular edge portion 24 located around the reverse dome portion 23 of the vibrating plate 22 is then fixed to the outer side of the frame 2 via the vibrating plate ring 25 having a cross-sectional L shape. The outer wall 6 has a step 7 on the stage, and the voice coil 2] is vertically movable in the magnetic gap 17 of the magnetic circuit 3. The wire 26 drawn from the winding start end and the winding end end of the voice coil 21 is pulled out from the wire pull-out port 11 to the outside of the yoke 1 and is suspended from the lower side of the frame 2 And through the round hole 12 and inserted into the round bar-shaped forming jig in the wire drawing position, it is bent into a slightly U-shape (forming), and is guided to the wire contact pad portion of the connecting object. Then, the front end of the wire 26 is connected to the wire contact pad portion 15 of the connection object by spot welding. The speaker 1 configured as described above is input with an audio signal from the external circuit through a pair of external connection terminals at the voice coil 21, and the magnetic field generated at the magnetic circuit 3 and the voice coil 2 1处-10-201004392 The interaction of the flowing current, the voice coil 2 1 vibrates up and down, and vibrates the vibrating plate 22 up and down in conjunction with it to vibrate the surrounding air and emit sound. At this time, since the magnetic circuit 3 is constituted by the plastic magnet 16 having a T-shaped cross section and the yoke 1 which is continuously provided on the bottom side and the periphery of the plastic magnet 16, the third piece of the prior art is passed. The number of components of the magnetic circuit of the type structure is reduced, and the mass productivity of the small and thin type of speaker can be improved. Further, since the top surface of the plastic magnet 16 is formed into a concave surface 18, and the central portion of the vibrating plate 2 2 is formed in an inverted dome shape, sufficient amplitude of the vibrating system 4 can be secured, and The acoustic performance is degraded to further reduce the thickness of the small and thin speaker. Further, since the cylindrical portion 20 which is raised by the projection forming process from the yoke 10 located at the bottom side of the plastic magnet 16 and the cylindrical portion 20 penetrates to the central portion of the plastic magnet 16 are provided The through hole 19 is joined to the yoke 10 by crushing the front end portion of the tubular portion 20, so that it is possible to assemble the magnetic circuit 3 without using an adhesive. The mass productivity of the small and thin type of speaker is further improved. In the present embodiment, one embodiment of the present invention is described by the circular speaker 1, but it may be an angle. Type of speaker. The present invention is not limited to the embodiment, and various modifications can be made without departing from the spirit and scope of the invention. -11 - 201004392 BRIEF DESCRIPTION OF THE DRAWINGS [FIG. 1] A cross-sectional view of a speaker according to one embodiment of the present invention. Fig. 2 is a plan view showing a state in which a vibrating plate of a speaker according to an embodiment of the present invention is made transparent. [Description of main component symbols] 1 : Speaker 2 : Frame 3 : Magnetic circuit 4 : Vibration system 1 0 : 辄 1 6 : Plastic magnet 1 7 : Magnetic gap 18 : Concave surface 1 9 : Through hole 20 : Tube part 21 : Voice coil 22: Vibrating plate 23: Reverse dome 12-