JP2001309486A - Electric/magnetic acoustic transducer - Google Patents
Electric/magnetic acoustic transducerInfo
- Publication number
- JP2001309486A JP2001309486A JP2000122304A JP2000122304A JP2001309486A JP 2001309486 A JP2001309486 A JP 2001309486A JP 2000122304 A JP2000122304 A JP 2000122304A JP 2000122304 A JP2000122304 A JP 2000122304A JP 2001309486 A JP2001309486 A JP 2001309486A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnet
- diaphragm
- working surface
- acoustic transducer
- 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.)
- Pending
Links
Landscapes
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電気―磁気音響変
換器に関するものである。詳しくは磁気回路配向技術と
平面型振動板と一体のプリント配線板ボイスコイルの組
み合わせにより構成部品の単純化と組立性の簡略化とい
う効果の得られる電気―磁気音響変換器に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electro-magnetic acoustic converter. More specifically, the present invention relates to an electro-magneto-acoustic converter that can obtain an effect of simplifying components and simplifying assemblability by combining a magnetic circuit orientation technique and a printed wiring board voice coil integrated with a planar diaphragm.
【０００２】[0002]
【従来の技術】従来の電気―磁気音響変換器の磁気回路
構成では、磁気効率を向上するため、磁気回路の構成要
素として磁石の磁束をボイスコイルギャップに集束する
ポールピースやプレート等の高い寸法精度を要する継鉄
を用い、閉磁路を形成する必要があった。そのため、磁
気特性のバラツキや振動系を組み立てる際の不具合を無
くすように磁気空隙は数μから数十μ公差の高い精度の
ギャップゲージが要求され、生産数量に応じてその数を
用意するのが大変であった。2. Description of the Related Art In a conventional magnetic circuit configuration of an electro-magneto-acoustic transducer, in order to improve magnetic efficiency, high dimensions such as a pole piece and a plate for converging a magnetic flux of a magnet into a voice coil gap are used as components of the magnetic circuit. It was necessary to form a closed magnetic circuit using a yoke that required high accuracy. Therefore, high precision gap gauges with a tolerance of several μ to several tens μ are required for the magnetic gap to eliminate variations in magnetic characteristics and problems when assembling the vibration system, and it is necessary to prepare the number according to the production quantity. It was hard.
【０００３】また、次工程でボイスコイルや振動板等の
振動系を組み立てる際にも同様に高精度のボイスコイル
ギャップゲージで位置出しをしつつ、接着剤が固まって
安定するまでの長時間にわたってゲージを外すことが出
来ないという問題があった。例えば米国特許第４２８１
２２３号明細書に記載されている高域再生専用のスピー
カーで平面型プリント配線板のボイスコイル振動板を採
用した場合でも、磁気回路組立てにおいてはギャップの
位置だしを必要とし、また、振動系の組み立て手順は簡
略化されないのである。Also, when assembling a vibration system such as a voice coil and a diaphragm in the next step, the position is similarly determined using a high-precision voice coil gap gauge, and it takes a long time until the adhesive hardens and stabilizes. There was a problem that the gauge could not be removed. For example, US Pat.
Even when a voice coil diaphragm of a flat printed wiring board is employed in a speaker dedicated to high-frequency reproduction described in the specification of Japanese Patent No. 223, the positioning of a gap is required in assembling a magnetic circuit. The assembly procedure is not simplified.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記した従
来技術の問題点を解決し、電気―磁気音響変換器の構造
が簡略化され、これまでの電気―磁気音響変換器に比べ
て、部品点数がほぼ半減でき、しかも積上げ式の組立て
構造をとることによる簡略化によって組立て時に高精度
の組立て冶具を全く必要としない電気―磁気音響変換器
を提供することを課題とする。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, simplifies the structure of the electro-magneto-acoustic transducer, and provides An object of the present invention is to provide an electro-magneto-acoustic converter which can reduce the number of parts by almost half, and which does not require any high-precision assembling jig at the time of assembling by simplification by taking a stacked type assembling structure.
【０００５】[0005]
【課題を解決しようとする手段】本発明者は、上記の課
題を解決するため研究を重ねた結果、その解決手段とし
て、電気―磁気音響変換に寄与する磁界の強度が継鉄の
閉磁路の磁気空隙によらずマグネット自身の磁路により
シンプル化する構成と、その磁束密度分布が変換効率に
作用するボイスコイルの近傍で変化が少ないブロードな
磁束密度特性の配向技術と当該磁気回路に適合したプリ
ント配線板ボイスコイルの電気回路を見出した。つま
り、磁界と振動板一体であるボイスコイルの配置精度を
安易に配置しても所定の電気−磁気変換性能が得られる
技術を発明したのである。The inventor of the present invention has conducted various studies to solve the above-mentioned problems, and as a result, the strength of the magnetic field contributing to the electro-magneto-acoustic conversion has been reduced by the yoke. The structure is simplified by the magnetic path of the magnet itself regardless of the magnetic air gap, and the magnetic flux density distribution is suitable for the orientation technology of the broad magnetic flux density characteristic with little change near the voice coil that affects the conversion efficiency and the magnetic circuit. The electric circuit of the voice coil on the printed wiring board was found. In other words, the inventor of the present invention has invented a technology that can obtain a predetermined electro-magnetic conversion performance even if the placement accuracy of the voice coil integrated with the magnetic field and the diaphragm is easily arranged.
【０００６】すなわち本発明は、異方性ボンド磁石の作
用面側の極を直接利用し、ギャップを隔てて振動板と一
体化した平面型のプリント配線板ボイスコイルを積上げ
式に組み立ててなる電気―磁気音響変換器を提供するも
のである。That is, according to the present invention, a flat printed wiring board voice coil integrated with a diaphragm via a gap by directly utilizing the pole on the working surface side of the anisotropic bonded magnet is assembled in a stacked manner. -To provide a magneto-acoustic transducer.
【０００７】以下本発明を説明する。磁気回路の構成を
単純化するためには、ポールピースやプレートなど閉磁
路を形成するための継鉄を省き、磁石自身で必要とする
磁路を構成することが出来ればよい。そのために特開平
６−１３２２３号公報に開示されている内面閉磁路型異
方性磁石技術を用いて、磁石単独で磁路を構成し電磁変
換させる部位に磁束を面内放射方向に発生させ変換効率
を実用領域にならしめた。このとき、磁石をボンド磁石
とすることにより、射出成形製造法他のすでに知られた
成型方法を利用しガイドボスやフランジを設け、振動板
の組立て冶具を不要にしたり、振動板背面の音響抵抗調
整孔を成形と同時に設けることが容易にできた。この様
にして本発明では、特殊配向（内面閉磁路配向）磁石と
振動板一体のフレキシブルプリント配線板ボイスコイル
の組み合わせにより電気−磁気変換器の構成部品と組立
て構造を簡略化することができたのである。Hereinafter, the present invention will be described. In order to simplify the configuration of the magnetic circuit, it suffices if the yoke for forming a closed magnetic path such as a pole piece or a plate is omitted, and the magnetic path required by the magnet itself can be formed. For this purpose, a magnetic flux is generated in an in-plane radial direction at a portion where a magnetic path is constituted by a magnet alone and electromagnetically converted by using an inner surface closed magnetic circuit type anisotropic magnet technology disclosed in Japanese Patent Application Laid-Open No. 6-13223. Efficiency has been put into practical use. At this time, by using a bonded magnet as the magnet, a guide boss or flange is provided by using an injection molding manufacturing method or another known molding method, so that a jig for assembling the diaphragm is not required, and the acoustic resistance on the back of the diaphragm is reduced. Adjustment holes could be easily provided at the same time as molding. In this manner, in the present invention, the components and the assembly structure of the electro-magnetic converter could be simplified by combining the special orientation (inner closed magnetic path orientation) magnet and the flexible printed wiring board voice coil integrated with the diaphragm. It is.
【０００８】[0008]
【発明の実施の形態】以下本発明の実施の形態を図面を
用いて説明する。本発明の磁気回路特性は、図１に示す
とおり、着磁された内面閉磁路磁石から発生する磁力線
が磁石作用面とおおむね平行となった領域、すなわち面
内放射方向に磁力線が発生している領域に、電気回路部
を周回方向に設計したフレキシブルプリント配線板を配
設することを特徴としている。平行磁場から外れた内
周、外周でより電気−磁気変換効率を改善する手法とし
て、図２に示すような磁場に対して常にボイスコイル電
流が曲面内で直行するようにダイアフラムの形状を湾曲
させても良い。また、作用面の磁束密度をより向上させ
る必要がある場合には図３のように一対のプレートを位
置だしホゾに冶具無しで落とし込むようにして行うこと
ができる。本発明にあっては、プレート等の部品精度は
磁気特性にシビアに影響を与えるものでないからラフな
加工精度の安価な部品でよく、またボイスコイルも冶具
無しで位置決めでき、所定の電気−磁気音響変換器特性
が得られ、かつ組み立てやすく安価に製造できる。Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the magnetic circuit characteristic of the present invention is such that the magnetic field lines generated from the magnetized inner closed magnetic path magnet are substantially parallel to the magnet working surface, that is, the magnetic field lines are generated in the in-plane radial direction. It is characterized in that a flexible printed wiring board in which the electric circuit portion is designed in the circumferential direction is disposed in the area. As a method of further improving the electric-magnetic conversion efficiency at the inner and outer circumferences deviating from the parallel magnetic field, the shape of the diaphragm is curved so that the voice coil current is always orthogonal to the curved surface with respect to the magnetic field as shown in FIG. May be. When it is necessary to further improve the magnetic flux density on the working surface, the pair of plates can be positioned as shown in FIG. 3 and dropped into a tenon without a jig. In the present invention, the accuracy of parts such as plates does not affect the magnetic characteristics severely, so that it is possible to use inexpensive parts with rough processing accuracy, and the voice coil can be positioned without a jig, and a predetermined electric-magnetic Acoustic transducer characteristics are obtained, and it is easy to assemble and can be manufactured at low cost.
【０００９】本発明で用いる磁石としてはボンド磁石及
び焼結磁石或いは鋳造磁石の何れも適用できるが、ボン
ド磁石の方が後加工することなく或いは後加工が格段に
少なくできるので望ましい。磁粉としてはフェライト系
磁粉、アルニコ（登録商標）系磁粉、サマリウムコバル
ト系磁粉、ネオジム鉄ボロン系磁粉、サマリウム鉄窒素
系磁粉等々、従来公知の何れも使用できる。また、ボン
ド即ち結合材については既に知られた合成樹脂が使用で
きるが清浄性を要求される場合は低融点金属を使用する
ことができる。As the magnet used in the present invention, any of a bonded magnet, a sintered magnet, and a cast magnet can be used. However, a bonded magnet is preferable without post-processing or because post-processing can be significantly reduced. Conventionally known magnetic powders such as ferrite-based magnetic powder, Alnico (registered trademark) -based magnetic powder, samarium-cobalt-based magnetic powder, neodymium-iron-boron-based magnetic powder, and samarium-iron-nitrogen-based magnetic powder can be used. As the bond, a known synthetic resin can be used, but when cleanliness is required, a low melting point metal can be used.
【００１０】例えば図１のボンド磁石は、射出成形によ
り得られたフェライト系合成樹脂磁石で、プリント配線
板ボイスコイルの近傍で必要な磁束を有し、磁束変化が
少なくブロードな磁気特性を持つ円盤状磁石である。こ
の円盤状磁石は、図１中で示す磁力線図の様に、作用面
上に二つの磁粉粒子の配向領域を有する永久磁石であっ
て、該配向領域における磁粉粒子の磁化容易軸が、該領
域の周縁部から磁石内部を通り、再び該領域の中央部に
集束配向する内面閉磁路型異方性磁石である。この様に
本発明による磁石の磁気回路は、ヨークやポールピー
ス、プレートを用いず射出成形のボンド磁石のみで実用
領域の磁気特性が得られる閉磁路を形成することができ
る。For example, the bond magnet shown in FIG. 1 is a ferrite-based synthetic resin magnet obtained by injection molding, has a required magnetic flux near a voice coil of a printed wiring board, has a small change in magnetic flux, and has a broad magnetic characteristic. Shaped magnet. As shown in the magnetic force diagram shown in FIG. 1, this disc-shaped magnet is a permanent magnet having two orientated regions of magnetic powder particles on the working surface. Is an inner surface closed magnetic circuit type anisotropic magnet which passes through the inside of the magnet from the peripheral portion of the above and is focused and oriented again at the center of the region. As described above, the magnetic circuit of the magnet according to the present invention can form a closed magnetic circuit in which magnetic characteristics in a practical range can be obtained only by the injection-molded bond magnet without using a yoke, a pole piece, and a plate.
【００１１】[0011]
【実施例】実施例１ 図４は本発明のスピーカの実施例１で、プリント配線板
ボイスコイル型スピーカの略側断面を示す構造図であ
る。図４中の１は内面閉磁路型異方性ボンド磁石であ
り、１ａはボンド磁石成形時に形成されるもので振動板
との組立てに要する振動板位置決め突起部であり、２は
ボンド磁石成形時に設けられた音響抵抗調整孔である。
振動系の構成は、３の振動板フランジ部と一体化されて
いる振動板４とプリント配線板ボイスコイル４ａから構
成されている。これには特開平１１−８８９８２号公報
に開示されている技術が利用できる。４ａへの給電は、
固定部分のリード線引き出しパット部５からリード線１
２により接続され、入力端子板９の＋入力端子１０と−
入力端子１１へそれぞれ結線されている。Embodiment 1 FIG. 4 is a structural diagram showing a schematic side cross section of a voice coil type speaker of a printed wiring board according to Embodiment 1 of the present invention. In FIG. 4, reference numeral 1 denotes an inner surface closed magnetic path type anisotropic bonded magnet, 1a denotes a diaphragm positioning projection which is formed at the time of forming the bonded magnet and is required for assembling with the diaphragm, and 2 denotes a bonding position at the time of forming the bonded magnet. It is an acoustic resistance adjusting hole provided.
The configuration of the vibration system includes a vibration plate 4 integrated with three diaphragm flange portions and a printed wiring board voice coil 4a. For this purpose, the technology disclosed in Japanese Patent Application Laid-Open No. H11-88982 can be used. Power supply to 4a
From the lead wire drawing pad part 5 of the fixed part to the lead wire 1
2, the + input terminal 10 of the input terminal plate 9 and the-
Each is connected to the input terminal 11.
【００１２】振動板の背面音響制動抵抗調整は振動板背
面ギャップスペーサ６により所望の最適ギャップを得る
とともに、６を弾性体で構成することで振動板の自由振
動によるビリ付き、異常音を防止することができる。ま
た、大きな振幅特性を要求される振動系においては振動
膜４、プリント配線板ボイスコイル４ｂなどに放射状の
リブやコルゲーションを形成し振動膜に形状強度を与
え、変形による素材の固有音やビリ付きなどを防止でき
る。７は振動板組立てを押さえるフレームで、このユニ
ットをシステムなどに組み込むための取付けも兼ねてい
る。７の背面は端子板取付けにもなるバックカバー８で
覆う様にし、このキャビティ容量が振動系のｆｏ（最低
共振周波数）となり低音域再生限界周波数を決める要素
になる。The adjustment of the rear acoustic damping resistance of the diaphragm is achieved by obtaining a desired optimum gap by the diaphragm rear gap spacer 6, and by forming the diaphragm 6 from an elastic body, the vibration caused by free vibration of the diaphragm and abnormal noise are prevented. be able to. Also, in a vibration system requiring a large amplitude characteristic, radial ribs or corrugations are formed on the vibration film 4, the printed wiring board voice coil 4b, etc. to give the vibration film a shape strength, and the material has a natural sound and undulation due to deformation. Can be prevented. Reference numeral 7 denotes a frame for holding the assembly of the diaphragm, and also serves as an attachment for incorporating this unit into a system or the like. The back surface of 7 is covered with a back cover 8 that can also be attached to a terminal plate, and the cavity capacity becomes the fo (minimum resonance frequency) of the vibration system, and is an element that determines the low-frequency range reproduction limit frequency.
【００１３】実施例２ 図５は本発明のインナーイヤー・ヘッドフォンに関する
実施例２の概略側断面図である。図４とほぼ同様な電気
−磁気音響変換構成で、振動板背面ギャップスペーサ６
を用いずに内面閉磁路型異方性ボンド磁石１の振動板嵌
合部に振動板背面ギャップ段差部１ｂを形成したもので
ある。また、給電部分は振動系の４、４ａとリード線引
き出しパット部５さらにフレキシブルプリント配線板リ
ード部４ｂと入力端子板９はフレキシブルプリント配線
板で一体構造としている。１３は振動板を保護するパン
チング・プロテクターである。本実施例にみる通りシン
プルな構造になり、部品点数が従来に比べほぼ半減し、
安価で高音質の電気−磁気音響変換器が得られる。Second Embodiment FIG. 5 is a schematic sectional side view of a second embodiment of the inner ear headphones according to the present invention. The electro-magnetic acoustic conversion configuration substantially similar to that of FIG.
The diaphragm back gap step portion 1b is formed in the diaphragm fitting portion of the inner surface closed magnetic circuit type anisotropic bonded magnet 1 without using the above. In the power supply portion, the vibration system 4 and 4a, the lead wire drawing pad portion 5, the flexible printed wiring board lead portion 4b and the input terminal plate 9 are integrally formed by a flexible printed wiring board. A punching protector 13 protects the diaphragm. As shown in this embodiment, the structure is simple, the number of parts is almost halved compared to the conventional one,
An inexpensive high-quality electro-magnetic acoustic transducer can be obtained.
【００１４】磁気回路において内面閉磁路型集束配向の
基本単位を図６の様に複数配置し広い変換作用面積を持
つもの、また図７のようにリング側面に複数配設するこ
とで水平面内に無指向性化したものや音響遅延型で任意
の指向性を持つものなどのさまざまな電気―磁気音響変
換器への応用展開ができる。さらに、図８，図９の様に
球形全体表面に複数配置する事で完全無指向性型の電気
−磁気音響変換器への応用も可能となる。In the magnetic circuit, a plurality of basic units of the inner surface closed magnetic circuit type focusing orientation are arranged as shown in FIG. 6 to have a wide conversion action area, and as shown in FIG. It can be applied to various electro-magneto-acoustic transducers, such as omni-directional type and acoustic delay type with arbitrary directivity. Further, by arranging a plurality of spheres on the entire spherical surface as shown in FIGS. 8 and 9, application to a completely omni-directional electro-magnetic acoustic converter is also possible.
【００１５】[0015]
【発明の効果】本発明によれば、電気―磁気音響変換器
の構造が簡略化され、従来の電気―磁気音響変換器に比
べて、部品点数をほぼ半減できるとともに、積上げ式組
立て構造をとることにより生産が簡単容易になり、且つ
組立て時に生産量に比例した高精度の組立て冶具を全く
必要とせず、コスト低減の効果も大きいという効果が得
られる。According to the present invention, the structure of the electro-magneto-acoustic transducer is simplified, the number of components can be reduced to almost half as compared with the conventional electro-magneto-acoustic transducer, and a stacked assembly structure is adopted. As a result, the production becomes simple and easy, and there is no need for a high-precision assembly jig in proportion to the production amount at the time of assembling.
【図１】 本発明の磁気回路の１例を示す説明図。FIG. 1 is an explanatory view showing one example of a magnetic circuit of the present invention.
【図２】 本発明の磁気回路の１例を示す説明図。FIG. 2 is an explanatory view showing one example of a magnetic circuit of the present invention.
【図３】 本発明の磁気回路の１例を示す説明図。FIG. 3 is an explanatory view showing one example of a magnetic circuit of the present invention.
【図４】 本発明をスピーカに適用した実施例１の略側
断面図。FIG. 4 is a schematic side sectional view of a first embodiment in which the present invention is applied to a speaker.
【図５】 本発明をインナー・イヤーヘッドフォンに適
用した実施例２の略側断面図。FIG. 5 is a schematic sectional side view of a second embodiment in which the present invention is applied to inner ear headphones.
【図６】 無指向性スピーカ及び音響遅延型の可変指向
性を持つマイクロフォンなどに本発明を応用展開した多
数個の磁極を持つ磁石の例。FIG. 6 is an example of a magnet having a large number of magnetic poles to which the present invention is applied to an omnidirectional speaker and a microphone having an acoustic delay type variable directivity.
【図７】 無指向性スピーカ及び音響遅延型の可変指向
性を持つマイクロフォンなどに本発明を応用展開した多
数個の磁極を持つ磁石の例。FIG. 7 is an example of a magnet having a large number of magnetic poles to which the present invention is applied to an omnidirectional speaker and a microphone having an acoustic delay type variable directivity.
【図８】 無指向性スピーカ及び音響遅延型の可変指向
性を持つマイクロフォンなどに本発明を応用展開した多
数個の磁極を持つ磁石の例。FIG. 8 is an example of a magnet having a large number of magnetic poles to which the present invention is applied and applied to an omnidirectional speaker, a microphone having acoustic delay type variable directivity, and the like.
【図９】 無指向性スピーカ及び音響遅延型の可変指向
性を持つマイクロフォンなどに本発明を応用展開した多
数個の磁極を持つ磁石の例。FIG. 9 is an example of a magnet having a large number of magnetic poles to which the present invention is applied to an omnidirectional speaker and a microphone having an acoustic delay type variable directivity.
１ 内面閉磁路型異方性ボンド磁石 １ａ 振動板位置決め突起部 １ｂ 振動板背面ギャップ段差部 ２ 音響抵抗調整孔 ３ 振動板フランジ部 ４ 振動板 ４ａ プリント配線板ボイスコイル ４ｂ フレキシブルプリント配線板リード部 ５ リード線引き出しパット部 ６ 振動板背面ギャップスペーサ ７ フレーム ８ バックカバー ９ 入力端子板 １０ ＋入力端子 １１ −入力端子 １２ リード線 １３ パンチング・プロテクター １４ 磁力線の方向 １５ 磁石内の磁粉の配向方向及び着磁方向 １６ 磁気収束プレート REFERENCE SIGNS LIST 1 inner surface closed magnetic circuit type anisotropic bonded magnet 1 a diaphragm positioning protrusion 1 b diaphragm rear gap step 2 acoustic resistance adjustment hole 3 diaphragm flange 4 diaphragm 4 a printed wiring board voice coil 4 b flexible printed wiring board lead 5 Lead wire drawing pad part 6 Gap spacer on back surface of diaphragm 7 Frame 8 Back cover 9 Input terminal plate 10 + Input terminal 11 -Input terminal 12 Lead wire 13 Punching protector 14 Direction of magnetic field line 15 Direction and orientation of magnetic powder in magnet Direction 16 Magnetic focusing plate
フロントページの続き (71)出願人 390032230 ニッポン高度紙工業株式会社 高知県吾川郡春野町弘岡上648番地 (72)発明者 梶田 充 東京都台東区寿１丁目11番11号 株式会社 アドユニオン研究所内 (72)発明者 井田 清 東京都中央区八丁堀２丁目22番８号 ピー エム技研株式会社内 (72)発明者 中塚 哲 広島県大竹市明治新開１番４号 戸田工業 株式会社内 (72)発明者 近森 俊二 高知県吾川郡春野町弘岡上648番地 ニッ ポン高度紙工業株式会社内 Ｆターム(参考） 5D012 AA02 BA05 BB03 BB05 FA10 HA01 Continuation of the front page (71) Applicant 390032230 Nippon Advanced Paper Industries Co., Ltd. (72) Inventor Kiyoshi Ida 2--22-8 Hatchobori, Chuo-ku, Tokyo PM Engineering Inc. (72) Inventor Satoshi Nakatsuka 1-4-1, Meiji Shinkai, Otake City, Hiroshima Prefecture Toda Kogyo Co., Ltd. (72) Invention Shunji Chikamori 648 Hirooka, Haruno-cho, Agawa-gun, Kochi Prefecture Nippon Advanced Paper Industry Co., Ltd. F-term (reference) 5D012 AA02 BA05 BB03 BB05 FA10 HA01
Claims (2)
利用し、ギャップを隔てて振動板と一体化したプリント
配線板ボイスコイルを積上げ式に組み立ててなる電気―
磁気音響変換器。1. An electric device comprising: a printed wiring board voice coil integrated with a diaphragm with a gap therebetween by directly utilizing a pole on a working surface side of an anisotropic bonded magnet;
Magnetoacoustic transducer.
なる作用面に、一つ又は二つ以上の磁粉粒子の配向領域
を有する永久磁石であって、該配向領域における磁粉粒
子の磁化容易軸が該作用面の一つの配向領域から磁石内
部を通り再び該作用面の別の配向領域に連続して配向
し、磁路をなす内面閉磁路型異方性ボンド磁石とするこ
とを特徴とする請求項１記載の電気―磁気音響変換器。2. The permanent magnet according to claim 1, wherein the anisotropic bonded magnet is a permanent magnet having one or two or more orientation regions of magnetic powder particles on a plane or curved working surface, wherein the magnetic particles in the orientation region are easily magnetized. The axis is continuously oriented to another orientation region of the working surface again from the one orientation region of the working surface to the other orientation region of the working surface to form an internal closed magnetic circuit type anisotropic bonded magnet forming a magnetic path. The electro-magneto-acoustic transducer according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000122304A JP2001309486A (en) | 2000-04-24 | 2000-04-24 | Electric/magnetic acoustic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000122304A JP2001309486A (en) | 2000-04-24 | 2000-04-24 | Electric/magnetic acoustic transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001309486A true JP2001309486A (en) | 2001-11-02 |
Family
ID=18632796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000122304A Pending JP2001309486A (en) | 2000-04-24 | 2000-04-24 | Electric/magnetic acoustic transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001309486A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005012360A (en) * | 2003-06-17 | 2005-01-13 | Sanyo Electric Co Ltd | Flat loudspeaker and electronic apparatus employing the same |
| JP2005252684A (en) * | 2004-03-04 | 2005-09-15 | Clarion Co Ltd | Flat surface speaker |
| WO2009096242A1 (en) * | 2008-01-28 | 2009-08-06 | Sanyo Electric Co., Ltd. | Magnetic circuit and acoustic equipment |
| WO2013140839A1 (en) * | 2012-03-19 | 2013-09-26 | ソニー株式会社 | Headphone driver, speaker, and method for manufacturing headphone driver or speaker |
| WO2014137010A1 (en) * | 2013-03-07 | 2014-09-12 | 주식회사 엑셀웨이 | Plate-type speaker comprising vibration plate integrally formed with voice film |
| CN114257932A (en) * | 2021-02-07 | 2022-03-29 | 歌尔股份有限公司 | Speaker and electronic apparatus |
-
2000
- 2000-04-24 JP JP2000122304A patent/JP2001309486A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005012360A (en) * | 2003-06-17 | 2005-01-13 | Sanyo Electric Co Ltd | Flat loudspeaker and electronic apparatus employing the same |
| JP2005252684A (en) * | 2004-03-04 | 2005-09-15 | Clarion Co Ltd | Flat surface speaker |
| WO2009096242A1 (en) * | 2008-01-28 | 2009-08-06 | Sanyo Electric Co., Ltd. | Magnetic circuit and acoustic equipment |
| JP2009177714A (en) * | 2008-01-28 | 2009-08-06 | Sanyo Electric Co Ltd | Magnetic circuit and acoustic equipment |
| WO2013140839A1 (en) * | 2012-03-19 | 2013-09-26 | ソニー株式会社 | Headphone driver, speaker, and method for manufacturing headphone driver or speaker |
| JPWO2013140839A1 (en) * | 2012-03-19 | 2015-08-03 | ソニー株式会社 | Headphone driver, speaker, headphone driver, or speaker manufacturing method |
| WO2014137010A1 (en) * | 2013-03-07 | 2014-09-12 | 주식회사 엑셀웨이 | Plate-type speaker comprising vibration plate integrally formed with voice film |
| CN114257932A (en) * | 2021-02-07 | 2022-03-29 | 歌尔股份有限公司 | Speaker and electronic apparatus |
| CN114257932B (en) * | 2021-02-07 | 2024-05-31 | 歌尔股份有限公司 | Speaker and electronic device |
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