JP2007104541A - Electric/acoustic transducer - Google Patents

Electric/acoustic transducer Download PDF

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JP2007104541A
JP2007104541A JP2005294701A JP2005294701A JP2007104541A JP 2007104541 A JP2007104541 A JP 2007104541A JP 2005294701 A JP2005294701 A JP 2005294701A JP 2005294701 A JP2005294701 A JP 2005294701A JP 2007104541 A JP2007104541 A JP 2007104541A
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diaphragm
frame
magnetic circuit
electroacoustic transducer
fixed
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Yoshito Fujimoto
嘉人 藤本
Hideo Yuasa
英夫 湯浅
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Hosiden Corp
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Hosiden Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric/acoustic transducer which can be further thinned while preventing the deterioration of acoustic performance or the disconnection of a lead wire of a voice coil. <P>SOLUTION: An electric/acoustic transducer comprises a magnetic circuit 25, a frame 29 fixed in a yoke 21 of the magnetic circuit 25; a diaphragm 26 fixed to the frame 29; and a voice coil 27 disposed in a magnetic gap 24 of the magnetic circuit 25 partially while being fixed to the diaphragm 26. In such an electric/acoustic transducer, a central portion of the diaphragm 26 is formed to be recessed, the surface of a pole piece 23 of the magnetic circuit 25 facing a central recess 26a of the diaphragm 26 is also formed to be recessed, and the height of the diaphragm 26 is suppressed low while sufficiently securing the amplitude of the diaphragm 26. Then, a gap 31 of a coupling part 30 between the yoke 21 and the frame 29 and the diaphragm 26 is not reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は携帯電話機等に内蔵される小型のスピーカやレシーバ等電気音響変換器に関する。   The present invention relates to an electroacoustic transducer such as a small speaker or receiver incorporated in a mobile phone or the like.

従来の電気音響変換器は図５に示すように磁性材料からなる有底筒状のヨーク１と、このヨーク１の内側底部に固定した柱状のマグネット２と、このマグネット２の上面に固定した磁性材料からなる板状のポールピース３とで、ポールピース３とヨーク１の周側壁端部との間に磁気ギャップ４を形成した磁気回路５を構成すると共に、上方に膨らんだセンタードーム部６ａの周縁に環状のエッジ部６ｂを一体に設けた樹脂や金属のフィルムからなる振動板６と、この振動板６のセンタードーム部６ａとエッジ部６ｂとの境目部分の裏面に上端を固定した筒状のボイスコイル７とで振動系を構成している。そして前記磁気回路５のヨーク１の外側には一対の接続端子８を固定した絶縁材料からなるフレーム９が固定され、このフレーム９の周縁部に前記振動板６の周縁部（エッジ部６ｂの外周縁部）を固定し、前記ボイスコイル７を前記磁気回路５の磁気ギャップ４内に上下動自在に挿嵌し、ボイスコイル７から引出した２本のリード線７ａを接続端子８に半田付けＳして構成していた。このように構成した電気音響変換器は外部回路から接続端子８を介してボイスコイル７に電気音響信号を入力することにより、磁気ギャップ４の磁界との電磁作用でボイスコイル７が上下に振動し、それに伴って振動板６が上下に振動して音を発生するものである。   As shown in FIG. 5, the conventional electroacoustic transducer includes a bottomed cylindrical yoke 1 made of a magnetic material, a columnar magnet 2 fixed to the inner bottom of the yoke 1, and a magnetic fixed to the upper surface of the magnet 2. A plate-like pole piece 3 made of a material constitutes a magnetic circuit 5 in which a magnetic gap 4 is formed between the pole piece 3 and the end of the peripheral side wall of the yoke 1, and the center dome portion 6a swelled upward is formed. A diaphragm 6 made of a resin or metal film with an annular edge portion 6b integrally provided on the periphery, and a cylindrical shape having an upper end fixed to the back surface of the boundary portion between the center dome portion 6a and the edge portion 6b of the diaphragm 6 The voice coil 7 constitutes a vibration system. A frame 9 made of an insulating material to which a pair of connection terminals 8 are fixed is fixed to the outer side of the yoke 1 of the magnetic circuit 5, and the peripheral portion of the diaphragm 6 (outside of the edge portion 6 b is attached to the peripheral portion of the frame 9. The peripheral portion is fixed, the voice coil 7 is inserted into the magnetic gap 4 of the magnetic circuit 5 so as to be movable up and down, and the two lead wires 7a drawn from the voice coil 7 are soldered to the connection terminal 8 S Was configured. The electroacoustic transducer configured as described above inputs an electroacoustic signal from an external circuit to the voice coil 7 via the connection terminal 8, so that the voice coil 7 vibrates up and down due to electromagnetic action with the magnetic field of the magnetic gap 4. Accordingly, the diaphragm 6 vibrates up and down to generate sound.

この種電気音響変換器は全体の薄型化を図るべく、フレーム９をヨーク１の開口端より一段下げた位置から外側に固定している。つまり磁気回路５の上部をフレーム９から上方に突出し、磁気回路５の電気音響変換器底面側への突出量を抑えるようにしていた。これに伴いフレーム９の固定端にはヨーク１の開口端部外面に沿ってリブ９ａが立上げられている（例えば「特許文献１」「特許文献２」参照）。
特開２００３−１５３３８２号公報 特開２００４−３５６７１３号公報 In this type of electroacoustic transducer, the frame 9 is fixed to the outside from a position where it is lowered by one step from the opening end of the yoke 1 in order to reduce the overall thickness. That is, the upper part of the magnetic circuit 5 protrudes upward from the frame 9 so as to suppress the protrusion amount of the magnetic circuit 5 toward the bottom surface of the electroacoustic transducer. Along with this, a rib 9 a is raised at the fixed end of the frame 9 along the outer surface of the open end of the yoke 1 (see, for example, “Patent Document 1” and “Patent Document 2”).
JP 2003-153382 A JP 2004-356713 A

上記のように従来の電気音響変換器は磁気回路５の電気音響変換器底面側への突出量を抑えることにより全体の薄型化を図ったが、この方法ではボイスコイル７の直ぐ外側のヨーク１とフレームとの結合部１０と振動板６（エッジ部６ｂの内周縁部）との隙間１１の狭小化を伴うため、さらなる電気音響変換器の薄型化は望めない。加えて前記隙間１１にはボイスコイル７のリード線７ａを通すため、狭小化に伴って前記結合部１０にリード線７ａが接触して断線し易くなることも、上記方法でのさらなる電気音響変換器の薄型化が望めない要因になっている。   As described above, the conventional electroacoustic transducer has been reduced in thickness by suppressing the amount of protrusion of the magnetic circuit 5 toward the bottom surface of the electroacoustic transducer. However, in this method, the yoke 1 immediately outside the voice coil 7 is used. Further reduction in the thickness of the electroacoustic transducer cannot be expected because the gap 11 between the coupling portion 10 and the diaphragm 6 (the inner peripheral edge of the edge portion 6b) is narrowed. In addition, since the lead wire 7a of the voice coil 7 is passed through the gap 11, the lead wire 7a is easily brought into contact with the coupling portion 10 as it is narrowed. The thinning of the vessel is a factor that cannot be expected.

本発明は上記の事情に鑑みさらなる薄型化を実現できる電気音響変換器を提供するものである。   This invention provides the electroacoustic transducer which can implement | achieve further thickness reduction in view of said situation.

本発明の請求項１に係る発明は磁気回路と、この磁気回路のヨークに固定されたフレームと、このフレームに固定された振動板と、この振動板に固定されて一部が前記磁気回路の磁気ギャップに配置されたボイスコイルとを備える電気音響変換器において、前記振動板の中央部を凹形状に形成すると共に、この振動板の中央凹部と対向する前記磁気回路のポールピースの表面も凹形状に形成したことを特徴とするものである。この構成により振動板の振幅を十分に確保しながら、振動板の高さを低く抑えることができるため、音響性能低下を招くことなく、さらなる電気音響変換器の薄型化を実現することができる。   According to a first aspect of the present invention, there is provided a magnetic circuit, a frame fixed to the yoke of the magnetic circuit, a diaphragm fixed to the frame, and a part of the magnetic circuit fixed to the diaphragm. In an electroacoustic transducer including a voice coil disposed in a magnetic gap, a central portion of the diaphragm is formed in a concave shape, and a surface of a pole piece of the magnetic circuit facing the central concave portion of the diaphragm is also concave. It is characterized by being formed into a shape. With this configuration, the height of the diaphragm can be kept low while sufficiently securing the amplitude of the diaphragm, so that further reduction in the thickness of the electroacoustic transducer can be realized without causing deterioration in acoustic performance.

本発明の請求項２に係る発明は磁気回路と、この磁気回路のヨークに固定されたフレームと、このフレームに固定された振動板と、この振動板に固定されて一部が前記磁気回路の磁気ギャップに配置されたボイスコイルとを備える電気音響変換器において、前記ヨークと前記フレームの結合部に前記振動板との隙間を部分的に拡大するための切欠きを設けたことを特徴とするものである。この構成によりボイスコイルのリード線を前記切欠きを通して半田付け部まで引出すことにより、前記結合部と前記振動板との隙間に少なくともボイスコイルのリード線が使用していた分の余裕ができるため、この隙間の狭小化を伴う従来の方法で、ボイスコイルのリード線の断線防止を図りながら、さらなる電気音響変換器の薄型化を実現することができる。   According to a second aspect of the present invention, there is provided a magnetic circuit, a frame fixed to the yoke of the magnetic circuit, a diaphragm fixed to the frame, and a part of the magnetic circuit fixed to the diaphragm. In an electroacoustic transducer including a voice coil disposed in a magnetic gap, a notch for partially expanding a gap between the diaphragm and the yoke and the frame is provided. Is. By pulling out the lead wire of the voice coil to the soldering portion through the notch by this configuration, it is possible to afford at least the voice coil lead wire used in the gap between the coupling portion and the diaphragm, With the conventional method involving the narrowing of the gap, it is possible to further reduce the thickness of the electroacoustic transducer while preventing disconnection of the lead wire of the voice coil.

本発明の請求項３に係る発明は請求項１に記載の電気音響変換器と請求項２に記載の電気音響変換器とを組み合わせたことを特徴とするもので、請求項１に係る発明と請求項２に係る発明の両面から、音響性能低下を招くことなく、またボイスコイルのリード線の断線防止を図りながら、さらなる電気音響変換器の薄型化を実現することができる。   The invention according to claim 3 of the present invention is characterized in that the electroacoustic transducer according to claim 1 and the electroacoustic transducer according to claim 2 are combined, and the invention according to claim 1 From both sides of the invention according to claim 2, it is possible to realize further reduction in thickness of the electroacoustic transducer without deteriorating acoustic performance and while preventing disconnection of the lead wire of the voice coil.

上記のように本発明は電気音響変換器のさらなる薄型化を実現することができると共に、それに伴う音響性能低下やボイスコイルのリード線の断線を防止することができる。   As described above, the present invention can further reduce the thickness of the electroacoustic transducer, and can prevent the accompanying deterioration in acoustic performance and disconnection of the lead wire of the voice coil.

以下本発明の実施の形態を図１〜図４を参照して説明する。図１は本発明の実施の形態に係る電気音響変換器の断面図、図２は同電気音響変換器の外観図、図３は同電気音響変換器のバッフル及び振動板を除去した状態の外観図（ただし振動板リングは残す）、図４は同電気音響変換器の接続端子基部の平面図である。   Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 is a cross-sectional view of an electroacoustic transducer according to an embodiment of the present invention, FIG. 2 is an external view of the electroacoustic transducer, and FIG. 3 is an external view of the electroacoustic transducer with a baffle and a diaphragm removed. FIG. 4 (with the diaphragm ring left) and FIG. 4 are plan views of the connection terminal base of the electroacoustic transducer.

本実施の形態の電気音響変換器は磁性材料からなる有底円筒状のヨーク２１と、このヨーク２１の内側底部に固定した円柱状のマグネット２２と、このマグネット２２の上面に固定した磁性材料からなる円板状のポールピース２３とで、ポールピース２３とヨーク２１の周側壁端部との間に磁気ギャップ２４を形成した内磁型の磁気回路２５を構成すると共に、円形の振動板リング４０に周縁部を接着固定した樹脂や金属のフィルムからなる円形の振動板２６と、この振動板２６の裏面に上端を固定した円筒状のボイスコイル２７とで振動系を構成している。そして前記磁気回路２５のヨーク２１の外側には一対の接続端子２８を固定した絶縁材料からなるフレーム２９が固定され、このフレーム２９の周縁部に前記振動板２６の周縁部を振動板リング４０を介して接着固定し、前記ボイスコイル２７を前記磁気回路２５の磁気ギャップ２４内に上下動自在に挿嵌し、ボイスコイル２７から引出した２本のリード線２７ａを接続端子２８に半田付けＳ（スポット溶接でも可）して構成している。このように構成した電気音響変換器は外部回路から接続端子２８を介してボイスコイル２７に電気音響信号を入力することにより、磁気ギャップ２４の磁界との電磁作用でボイスコイル２７が上下に振動し、それに伴って振動板２６が上下に振動して音を発生するものである。 The electroacoustic transducer according to the present embodiment includes a bottomed cylindrical yoke 21 made of a magnetic material, a columnar magnet 22 fixed to the inner bottom of the yoke 21, and a magnetic material fixed to the upper surface of the magnet 22. The disc-shaped pole piece 23 constitutes an inner magnet type magnetic circuit 25 in which a magnetic gap 24 is formed between the pole piece 23 and the end portion of the peripheral side wall of the yoke 21, and a circular diaphragm ring 40. The vibration system is composed of a circular diaphragm 26 made of a resin or metal film having a peripheral edge bonded and fixed thereto, and a cylindrical voice coil 27 having an upper end fixed to the back surface of the diaphragm 26. Then the frame 29 made of an insulating material which is fixed a pair of connection terminals 28 is fixed to the outer yoke 21 of magnetic circuit 25, the diaphragm ring 40 and the peripheral edge portion of the diaphragm 26 to the peripheral edge of the frame 29 The voice coil 27 is inserted into the magnetic gap 24 of the magnetic circuit 25 so as to be movable up and down, and the two lead wires 27a drawn from the voice coil 27 are soldered to the connection terminals 28 (S). Spot welding is also possible). The electroacoustic transducer configured as described above inputs an electroacoustic signal from an external circuit to the voice coil 27 via the connection terminal 28, so that the voice coil 27 vibrates up and down by electromagnetic action with the magnetic field of the magnetic gap 24. Accordingly, the diaphragm 26 vibrates up and down to generate sound.

ここで前記フレーム２９は一端が磁気回路２５と同芯の半円形に丸められ、他端を角張らせた平面視略かまぼこ形の板状に形成されており、このフレーム２９の周縁部には外壁面がフレーム２９の外周縁に沿って立上り、かつ内壁面が振動板２６の外周縁に沿って立上がり、かつフレーム２９の角張った端部側の一部が破られた段付きの平面視略Ｃ形の側壁２９ａが立設されており、この側壁２９ａの内壁段差面２９ａ'に前記振動板２６の周縁部が振動板リング４０を介して接着固定されている。つまり振動板２６は前記フレーム２９の表面よりやや持ち上げられて固定されている。またフレーム２９の側壁２９ａの内側には振動板２６を保護するための金属製のバッフル３２が嵌着されており、このバッフル３２は縁部３２ａを有し、この縁部３２ａの端部を振動板２６の周縁部の表面に固定し、振動板２６の周縁部を振動板リング４０と共にフレーム２９の側壁２９ａの内壁段差面２９ａ'とバッフル３２の縁部３２ａの間に挟込んでいる。バッフル３２の天板部表面はフレーム２９の側壁２９ａの端面と略面一になっている。このバッフル３２の縁部３２ａもフレーム２９の側壁２９ａと同様にフレーム２９の角張った端部側の一部が破られている。この構成により本実施の形態の電気音響変換器はフレーム２９の角張った端部側面に放音孔３３が開設され、この放音孔３３から振動系の振動方向と直交する側方に向かって音を放射するように構成されている。放音孔３３は電気音響変換器の角角張った端部側の表面からその放音孔３３を開設した側面に貼付ける補償布（制動布）３４により塞がれている。なお天板部に小さい放音孔を多数開設した周知のバッフルを使用し、電気音響変換器の表面側から振動系の振動方向に沿って音を放射することもできる。 Here, one end of the frame 29 is rounded into a semicircular shape concentric with the magnetic circuit 25, and the other end is formed in a substantially semi-cylindrical plate shape in a plan view. Plane plan view with a step where the outer wall surface rises along the outer peripheral edge of the frame 29, the inner wall surface rises along the outer peripheral edge of the diaphragm 26, and a part of the angular end side of the frame 29 is broken. A C-shaped side wall 29 a is erected, and the peripheral edge of the diaphragm 26 is bonded and fixed to the inner wall step surface 29 a ′ of the side wall 29 a via the diaphragm ring 40 . That is, the diaphragm 26 is fixed by being lifted slightly from the surface of the frame 29. A metal baffle 32 for protecting the diaphragm 26 is fitted inside the side wall 29a of the frame 29. The baffle 32 has an edge portion 32a, and the end portion of the edge portion 32a vibrates. The diaphragm 26 is fixed to the surface of the peripheral edge of the plate 26, and the peripheral edge of the diaphragm 26 is sandwiched between the inner wall step surface 29 a ′ of the side wall 29 a of the frame 29 and the edge 32 a of the baffle 32 together with the diaphragm ring 40 . The surface of the top plate portion of the baffle 32 is substantially flush with the end surface of the side wall 29 a of the frame 29. Similarly to the side wall 29a of the frame 29, a part of the edge portion 32a of the baffle 32 on the side of the angular end of the frame 29 is broken. With this configuration, the electroacoustic transducer according to the present embodiment has a sound emission hole 33 formed on the side surface of the end portion of the frame 29 that is angular, and sound is emitted from the sound emission hole 33 toward the side perpendicular to the vibration direction of the vibration system. Is configured to radiate. The sound emitting hole 33 is closed by a compensation cloth (braking cloth) 34 attached to the side surface where the sound emitting hole 33 is opened from the angular end surface of the electroacoustic transducer. A known baffle having a large number of small sound emission holes in the top plate portion can be used to radiate sound from the surface side of the electroacoustic transducer along the vibration direction of the vibration system.

また前記フレーム２９の周縁部には磁気回路２５と同芯円上に略等間隔に配設する複数の位置決め孔２９ｂが開設され、この位置決め孔２９ｂは電気音響変換器を携帯電話機等の筺体に取付ける時の位置決めに用いられる。前記磁気回路２５のヨーク２１の底面周縁部にもこのヨーク２１と同芯円上に略等間隔に配設する複数の位置決め孔２１ａが開設され、この位置決め孔２１ａは電気音響変換器を組立てる時の構成部品の位置決めに用いられる。   In addition, a plurality of positioning holes 29b are provided on the peripheral edge of the frame 29 on the concentric circle with the magnetic circuit 25 at substantially equal intervals. The positioning holes 29b can be used to mount an electroacoustic transducer on a housing such as a cellular phone. Used for positioning when mounting. A plurality of positioning holes 21a are provided on the periphery of the bottom surface of the yoke 21 of the magnetic circuit 25 so as to be arranged at substantially equal intervals on a concentric circle with the yoke 21, and these positioning holes 21a are used when an electroacoustic transducer is assembled. It is used for positioning of components.

また前記フレーム２９はインサート成形加工により磁気回路２５のヨーク２１及び一対の接続端子２８と一体に成形されており、この接続端子２８は薄板金属を打抜き加工して形成したもので、この接続端子２８には一端に設ける横向きの基部２８ａと、この基部２８ａの一側端部から直角に延出する細長い可動接片２８ｂと、この可動接片２８ｂの先端部に設ける接点部２８ｃとが連続一体に連設形成されている。各接続端子２８は基部２８ａがフレーム２９の角張った端部側に左右対称に埋込み固定され、フレーム２９の角張った端部の左右側端部から各接続端子２８の可動接片２８ｂが突出されている。図２の実線に示した各接続端子２８の可動接片２８ｂはフレーム２９の成形後の半製品状態のもので、フレーム２９の角張った端部の左右側端部から真っ直ぐに延出されているが、この各接続端子２８の可動接片２８ｂは図２の仮想線に示すように電気音響変換器の組立て工程における例えば最終工程において曲げ加工されてフレーム２９の裏面側に折返され、電気音響変換器の裏面側の左右側部に先端部に機器側基板との接点部２８ｃを設けた片持ち梁状の可動接片２８ｂを設けるように構成している。   The frame 29 is integrally formed with the yoke 21 and the pair of connection terminals 28 of the magnetic circuit 25 by insert molding, and the connection terminals 28 are formed by stamping a thin metal plate. Includes a laterally-facing base portion 28a provided at one end, an elongated movable contact piece 28b extending perpendicularly from one side end portion of the base portion 28a, and a contact portion 28c provided at the distal end portion of the movable contact piece 28b. It is formed continuously. Each connection terminal 28 has a base portion 28a embedded and fixed symmetrically on the angular end portion side of the frame 29, and a movable contact piece 28b of each connection terminal 28 protrudes from the left and right end portions of the angular end portion of the frame 29. Yes. The movable contact piece 28b of each connection terminal 28 shown by the solid line in FIG. 2 is in a semi-finished product state after the frame 29 is formed, and extends straight from the left and right end portions of the angular end portion of the frame 29. However, the movable contact piece 28b of each connection terminal 28 is bent in the final step of the assembly process of the electroacoustic transducer as shown by the phantom line in FIG. A movable contact piece 28b in the form of a cantilever having a contact portion 28c with the device side substrate at the tip is provided on the left and right sides of the back side of the device.

また前記フレーム２９の角張った端部表面の左右中央部にはその左右外側の側壁２９ａの端部より高さの低い隔壁２９ｃが設けられ、この隔壁２９ｃとその左右外側の側壁２９ａの端部との間のフレーム２９の表面（図４に斜線で示す部分）に接続端子２８の基部２８ａの一部を略面一に露出し、フレーム２９の角張った端部表面の左右側部にボイスコイル２７から引出した２本のリード線２７ａの端部を半田付けＳするための一対の半田付け部２９ｄを設けている。なお前記隔壁２９ｃは側壁２９ａの内壁段差面２９ａ'と略同じ高さに設けられ、この隔壁２９ｃの内側端部上面にて側壁２９ａの端部間（側壁２９ａが破られた部分）における前記振動板２６の周縁部を振動板リング４０を介して接着固定し、振動板２６を前記フレーム２９の表面よりやや持ち上げて固定している。 Further, a partition wall 29c having a height lower than that of the left and right outer side walls 29a is provided at the left and right central portions of the square end surface of the frame 29, and this partition wall 29c and the end portions of the left and right outer side walls 29a are provided. A part of the base portion 28a of the connection terminal 28 is substantially flush with the surface of the frame 29 (the portion indicated by hatching in FIG. 4), and the voice coil 27 is formed on the left and right sides of the angular end surface of the frame 29. A pair of soldering portions 29d for soldering S the ends of the two lead wires 27a drawn out from is provided. The partition wall 29c is provided at substantially the same height as the inner wall step surface 29a 'of the side wall 29a, and the vibration between the end portions of the side wall 29a (the portion where the side wall 29a is broken) on the inner end top surface of the partition wall 29c. The peripheral edge portion of the plate 26 is bonded and fixed through a diaphragm ring 40 , and the diaphragm 26 is fixed by being lifted slightly from the surface of the frame 29.

本実施の形態の電気音響変換器はこれを薄型化するために以下のような構成を採用している。   The electroacoustic transducer according to the present embodiment employs the following configuration in order to reduce the thickness thereof.

先ず図１に示すようにフレーム２９をヨーク２１の開口端より一段下げた位置から外側に固定している。つまり磁気回路２５の上部をフレーム２９から上方に突出し、磁気回路２５の電気音響変換器底面側への突出量を抑えるように構成している。   First, as shown in FIG. 1, the frame 29 is fixed to the outside from a position lowered by one step from the opening end of the yoke 21. That is, the upper portion of the magnetic circuit 25 protrudes upward from the frame 29, and the amount of protrusion of the magnetic circuit 25 toward the bottom surface of the electroacoustic transducer is suppressed.

上記構成に伴いフレーム２９の固定端にはヨーク２１の開口端部外面に沿ってリブ２９ｅが立上げられている。このためヨーク２１の開口端部とその外側のフレーム２９のリブ２９ｂ、つまりヨーク２１とフレーム２９の結合部３０がフレーム２９の表面から一段突出し、この結合部３０と振動板２６との隙間３１が狭くなっている。つまりボイスコイル２７の直ぐ外側に前記結合部３０が土手のように突出し、振動板２６との隙間３１が狭くなっている。 With the above configuration, a rib 29 e is raised at the fixed end of the frame 29 along the outer surface of the open end of the yoke 21. Therefore, the opening end of the yoke 21 and the rib 29b of the frame 29 outside thereof, that is, the coupling portion 30 between the yoke 21 and the frame 29 protrudes one step from the surface of the frame 29, and a gap 31 between the coupling portion 30 and the diaphragm 26 is formed. It is narrower. That is, the coupling portion 30 protrudes just like a bank just outside the voice coil 27, and the gap 31 with the diaphragm 26 is narrowed.

また図１に示すように前記振動板２６を磁気回路２５側に向かって下方に膨らんだセンター逆ドーム部２６ａと、このセンター逆ドーム部２６ａの周縁に一体に設けた環状のエッジ部２６ｂとで構成し、前記振動板２６の中央部を凹形状に形成すると共に、この振動板２６の中央凹部であるセンター逆ドーム部２６ａと対向する磁気回路２５のポールピース２３の中央部表面に球面の一部でなる凹部２３ａを設け、振動板２６の中央凹部であるセンター逆ドーム部２６ａと対向する磁気回路２５のポールピース２３の中央部表面も凹形状に形成している。この構成により振動板２６の振幅を十分に確保しながら、振動板２６の高さを低く抑えることができるため、音響性能低下を招くことなく、さらなる電気音響変換器の薄型化が可能になっている。またこの方法では結合部３０と振動板２６との隙間３１の狭小化も伴わないため、ボイスコイル２７のリード線２７ａの断線防止を図りながら、さらなる電気音響変換器の薄型化が可能になっている。なおボイスコイル２７は前記振動板２６のセンター逆ドーム部２６ａとエッジ部２６ｂとの境目部分の裏面に上端が固定されている。ここで振動板２６のセンター逆ドーム部２６ａの表面又は裏面にセンター逆ドーム部２６ａと同じ形状のＰＥＴ（ポリエチレンテレフタレート）フィルムを重ね合わせ、センター逆ドーム部２６ａを二重構造に構成することにより、共振周波数を下げると共に、振動板２６の剛性を高め、耐入力低下を防止できるため、電気音響変換器の低音再生能力を高めることができる。 Further, as shown in FIG. 1, a center reverse dome portion 26a in which the diaphragm 26 swells downward toward the magnetic circuit 25 side, and an annular edge portion 26b provided integrally on the periphery of the center reverse dome portion 26a. The center portion of the diaphragm 26 is formed in a concave shape, and a spherical surface is formed on the surface of the center portion of the pole piece 23 of the magnetic circuit 25 facing the center reverse dome portion 26a which is the center recess portion of the diaphragm 26. The central surface of the pole piece 23 of the magnetic circuit 25 facing the reverse center dome 26a, which is the central recess of the diaphragm 26, is also formed in a concave shape. With this configuration, the height of the diaphragm 26 can be kept low while sufficiently securing the amplitude of the diaphragm 26, so that it is possible to further reduce the thickness of the electroacoustic transducer without deteriorating the acoustic performance. Yes. In addition, this method does not involve the narrowing of the gap 31 between the coupling portion 30 and the diaphragm 26, so that it is possible to further reduce the thickness of the electroacoustic transducer while preventing disconnection of the lead wire 27a of the voice coil 27. Yes. Note that the upper end of the voice coil 27 is fixed to the back surface of the boundary portion between the center inverted dome portion 26a and the edge portion 26b of the diaphragm 26. Here superposed PET (polyethylene terephthalate) film having the same shape as the center inverted dome portion 26a on the front or back surface of the center opposite the dome portion 26a of the diaphragm 26, by forming the center inverted dome portion 26a in a double structure, The resonance frequency can be lowered, the rigidity of the diaphragm 26 can be increased, and the input resistance can be prevented from being lowered. Therefore, the bass reproduction capability of the electroacoustic transducer can be increased.

さらに図３に示すようにボイスコイル２７の直ぐ外側に土手のように存在するヨーク２１とフレーム２９の前記結合部３０に前記振動板２６（エッジ部２６ｂの内周縁部）との前記隙間３１を部分的に拡大するためこの結合部３０の左右２箇所に切欠き３０ａを設け、ボイスコイル２７の一方のリード線２７ａをボイスコイル本体からその直ぐ左側に設けた切欠き３０ａを通して前記結合部３０の外周側のフレーム２９の周縁部と振動板２６のエッジ部２６ｂとの広い隙間に引出した後、その広い隙間からさらに隔壁２９ｃとその左外側の側壁２９ａの一端部との間における前記振動板リング４０と前記フレーム２９との隙間を通して左側の前記半田付け部２９ｄまで引出し、一方のリード線２７ａの端部を左側の前記半田付け部２９ｄに半田付けＳすると共に、ボイスコイル２７の他方のリード線２７ａをボイスコイル本体からその直ぐ右側に設けた切欠き３０ａを通して前記結合部３０の外周側のフレーム２９の周縁部と振動板２６のエッジ部２６ｂとの広い隙間に引出した後、その広い隙間からさらに隔壁２９ｃとその右外側の側壁２９ａの他端部との間における前記振動板リング４０と前記フレーム２９との隙間を通して右側の前記半田付け部２９ｄまで引出し、他方のリード線２７ａの端部を右側の前記半田付け部２９ｄに半田付けＳするように構成している。この構成により前記結合部３０と前記振動板２６との隙間３１に少なくともボイスコイル２７のリード線２７ａが使用していた分の余裕ができるため、この隙間３１の狭小化を伴う上記した磁気回路２５の電気音響変換器底面側への突出量を抑える方法で、ボイスコイル２７のリード線２７ａの断線防止を図りながら、さらなる電気音響変換器の薄型化が可能になっている。ここでボイスコイル２７のリード線２７ａは図１に示すようにボイスコイル本体から半田付け部２９ｄまでを振動板２６の裏面に沿わせることが望ましい。この構成によりボイスコイル２７のリード線２７ａを上記切欠き３０ａを通過する引出し経路でボイスコイル本体から半田付け部２９ｄに引出すことができ、電気音響変換器の薄型化に伴うボイスコイル２７のリード線２７ａの断線をより確実に防止することができる。 Further, as shown in FIG. 3, the gap 31 between the yoke 21 that exists just like a bank just outside the voice coil 27 and the coupling portion 30 of the frame 29 and the diaphragm 26 (the inner peripheral edge of the edge portion 26b) is formed. In order to partially enlarge, notches 30a are provided at two left and right portions of the connecting portion 30, and one lead wire 27a of the voice coil 27 is passed through the notch 30a provided on the left side of the voice coil main body. The diaphragm ring between the peripheral edge of the outer peripheral frame 29 and the edge 26b of the diaphragm 26, and then between the partition wall 29c and one end of the left outer side wall 29a through the wide gap. 40 and the drawer through the gap between the frame 29 to the soldering portion 29d of the left side, the end of one lead wire 27a to the soldering portion 29d of the left half At the same time, the other lead wire 27a of the voice coil 27 is passed through a notch 30a provided on the right side of the voice coil main body through a notch 30a and a peripheral portion of the frame 29 on the outer peripheral side of the coupling portion 30 and an edge portion 26b of the diaphragm 26. The right soldering portion through the clearance between the diaphragm ring 40 and the frame 29 between the partition wall 29c and the other end of the right outer side wall 29a. The other lead wire 27a is pulled out to 29d and soldered S to the right soldering portion 29d. With this configuration, at least the space used by the lead wire 27a of the voice coil 27 can be provided in the gap 31 between the coupling portion 30 and the diaphragm 26. Therefore, the magnetic circuit 25 described above with the narrowing of the gap 31 is provided. Further, it is possible to further reduce the thickness of the electroacoustic transducer while preventing breakage of the lead wire 27a of the voice coil 27 by the method of suppressing the amount of protrusion to the bottom surface side of the electroacoustic transducer. Here, as shown in FIG. 1, the lead wire 27a of the voice coil 27 preferably extends from the voice coil main body to the soldered portion 29d along the back surface of the diaphragm 26. With this configuration, the lead wire 27a of the voice coil 27 can be drawn from the voice coil main body to the soldering portion 29d through a drawing path passing through the notch 30a, and the lead wire of the voice coil 27 accompanying the thinning of the electroacoustic transducer. The disconnection of 27a can be prevented more reliably.

本発明の実施の形態に係る電気音響変換器の断面図である。It is sectional drawing of the electroacoustic transducer which concerns on embodiment of this invention. 同電気音響変換器の外観図である。It is an external view of the same electroacoustic transducer. 同電気音響変換器のバッフル及び振動板を除去した状態の外観図（ただし振動板リングは残す）である。It is an external view (however, a diaphragm ring is left) in the state which removed the baffle and diaphragm of the same electroacoustic transducer. 同電気音響変換器の接続端子基部の平面図である。It is a top view of the connection terminal base of the same electroacoustic transducer. 従来の電気音響変換器を示す断面図である。It is sectional drawing which shows the conventional electroacoustic transducer.

符号の説明Explanation of symbols

２１ ヨーク
２２ マグネット
２３ ポールピース
２３ａ 凹部
２４ 磁気ギャップ
２５ 磁気回路
２６ 振動板
２６ａ センター逆ドーム部
２７ ボイスコイル
２９ フレーム
３０ 結合部
３０ａ 切欠き
３１ 隙間 21 yoke 22 magnet 23 pole piece 23a recess 24 magnetic gap 25 magnetic circuit 26 diaphragm 26a center reverse dome part 27 voice coil 29 frame 30 coupling part 30a notch 31 gap

Claims (3)

磁気回路と、この磁気回路のヨークに固定されたフレームと、このフレームに固定された振動板と、この振動板に固定されて一部が前記磁気回路の磁気ギャップに配置されたボイスコイルとを備える電気音響変換器において、前記振動板の中央部を凹形状に形成すると共に、この振動板の中央凹部と対向する前記磁気回路のポールピースの表面も凹形状に形成したことを特徴とする電気音響変換器。   A magnetic circuit; a frame fixed to the yoke of the magnetic circuit; a diaphragm fixed to the frame; and a voice coil fixed to the diaphragm and partially disposed in the magnetic gap of the magnetic circuit. In the electroacoustic transducer provided, the center portion of the diaphragm is formed in a concave shape, and the pole piece surface of the magnetic circuit facing the central recess portion of the diaphragm is also formed in a concave shape. Acoustic transducer. 磁気回路と、この磁気回路のヨークに固定されたフレームと、このフレームに固定された振動板と、この振動板に固定されて一部が前記磁気回路の磁気ギャップに配置されたボイスコイルとを備える電気音響変換器において、前記ヨークと前記フレームの結合部に前記振動板との隙間を部分的に拡大するための切欠きを設けたことを特徴とする電気音響変換器。   A magnetic circuit; a frame fixed to the yoke of the magnetic circuit; a diaphragm fixed to the frame; and a voice coil fixed to the diaphragm and partially disposed in the magnetic gap of the magnetic circuit. An electroacoustic transducer comprising: a notch for partially expanding a gap between the diaphragm and a coupling portion between the yoke and the frame. 請求項１に記載の電気音響変換器と請求項２に記載の電気音響変換器とを組み合わせたことを特徴とする電気音響変換器。   An electroacoustic transducer comprising a combination of the electroacoustic transducer according to claim 1 and the electroacoustic transducer according to claim 2.
JP2005294701A 2005-10-07 2005-10-07 Electric/acoustic transducer Pending JP2007104541A (en)

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Publication number Priority date Publication date Assignee Title
JP2010021609A (en) * 2008-07-08 2010-01-28 Namiki Precision Jewel Co Ltd Multi-functional vibrating actuator
JP2011171796A (en) * 2010-02-16 2011-09-01 Sanyo Electric Co Ltd Speaker unit
CN101227765B (en) * 2008-01-29 2012-07-04 歌尔声学股份有限公司 Ultra-thin moving-coil type electro-acoustic conversing device
CN107404692A (en) * 2017-08-04 2017-11-28 奥音科技（镇江）有限公司 A kind of protecgulum applied to electroacoustic transducer

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CN101227765B (en) * 2008-01-29 2012-07-04 歌尔声学股份有限公司 Ultra-thin moving-coil type electro-acoustic conversing device
JP2010021609A (en) * 2008-07-08 2010-01-28 Namiki Precision Jewel Co Ltd Multi-functional vibrating actuator
JP2011171796A (en) * 2010-02-16 2011-09-01 Sanyo Electric Co Ltd Speaker unit
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CN107404692A (en) * 2017-08-04 2017-11-28 奥音科技（镇江）有限公司 A kind of protecgulum applied to electroacoustic transducer

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