JP4553984B1 - Electromagnetic transducer - Google Patents

Electromagnetic transducer Download PDF

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JP4553984B1
JP4553984B1 JP2010517103A JP2010517103A JP4553984B1 JP 4553984 B1 JP4553984 B1 JP 4553984B1 JP 2010517103 A JP2010517103 A JP 2010517103A JP 2010517103 A JP2010517103 A JP 2010517103A JP 4553984 B1 JP4553984 B1 JP 4553984B1
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diaphragm
electromagnetic transducer
coil pattern
plate
view
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JPWO2010122605A1 (en
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俊治 吉田
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Mitsubishi Electric Engineering Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/025—Diaphragms comprising polymeric materials
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/027—Diaphragms comprising metallic materials
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H04R7/24—Tensioning by means acting directly on free portions of diaphragm or cone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/046—Construction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/046—Construction
    • H04R9/047—Construction in which the windings of the moving coil lay in the same plane
    • H04R9/048—Construction in which the windings of the moving coil lay in the same plane of the ribbon type

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

一対のフレーム１６，１７を組み合わせた際に空洞の内部が形成され、一対のフレーム１６，１７の内部に配置された永久磁石３２，３３には磁束を集中させるプレート３８が設けられており、振動板２１は、プレート３８からの磁束を受けるコイルパターン２１ｂが振動膜２１ａ上に形成され、厚さを均一にした振動膜２１ａが凹凸形状の立体構造に形成されている。
【選択図】図３When the pair of frames 16 and 17 are combined, the inside of the cavity is formed, and the permanent magnets 32 and 33 arranged inside the pair of frames 16 and 17 are provided with a plate 38 for concentrating the magnetic flux, and vibration In the plate 21, a coil pattern 21b that receives magnetic flux from the plate 38 is formed on the vibration film 21a, and the vibration film 21a having a uniform thickness is formed in an uneven three-dimensional structure.
[Selection] Figure 3

Description

この発明は、永久磁石と振動板とを組み合わせて、オーディオ信号から音声再生を行う電磁変換器に関するものである。   The present invention relates to an electromagnetic transducer that reproduces sound from an audio signal by combining a permanent magnet and a diaphragm.

永久磁石と振動板とを組み合わせた従来の電磁変換器は、永久磁石と振動板とを対向するように配置し、また、永久磁石と振動板との間に緩衝材を配置したものがある。これらの永久磁石、振動板及び緩衝材は、フレーム等の部材に挟み込まれるように覆われて、例えばスピーカの筺体に取り付けられる。   Some conventional electromagnetic transducers in which a permanent magnet and a diaphragm are combined are arranged so that the permanent magnet and the diaphragm face each other, and a buffer material is arranged between the permanent magnet and the diaphragm. These permanent magnets, diaphragms, and cushioning materials are covered so as to be sandwiched between members such as a frame, and are attached to a speaker housing, for example.

この種の電磁変換器の永久磁石は、一定の間隔を持って交互に異なる極性に配置された帯状の磁石部位（多極着磁パターンとも言う）を有している。また、振動板は、永久磁石の異なる磁極の境界にある間隙、すなわち磁界のニュートラルゾーンと称される部分に対向する位置に蛇行コイルパターンを配置したものである。振動板に配置された蛇行コイルパターンに音声信号が流れると、蛇行コイルパターンと永久磁石の多極着磁パターンとが電磁的に作用し、フレミングの法則に従って振動板が振動する。この振動によって、周囲の空気が振動して音波が発生する。この発生した音波は永久磁石及びフレームにあけられた音放射孔を通して電磁変換器の外部に放射され、オーディオ再生が行われる（例えば、特許文献１参照）。   The permanent magnet of this type of electromagnetic transducer has strip-shaped magnet portions (also referred to as multipolar magnetization patterns) alternately arranged at different polarities with a constant interval. The diaphragm has a meandering coil pattern disposed at a position facing a gap at a boundary between different magnetic poles of the permanent magnet, that is, a portion called a neutral zone of the magnetic field. When an audio signal flows through the serpentine coil pattern disposed on the diaphragm, the serpentine coil pattern and the multi-pole magnetized pattern of the permanent magnet act electromagnetically, and the diaphragm vibrates according to Fleming's law. Due to this vibration, ambient air vibrates and a sound wave is generated. The generated sound wave is radiated to the outside of the electromagnetic transducer through a permanent magnet and a sound radiation hole formed in the frame, and audio reproduction is performed (for example, refer to Patent Document 1).

また、振動板が繰り返し振動を受けて蛇行コイルパターンが金属疲労により断線するのを防止するために、振動板が剛性付与部材等で補強されている構成が開示されている（例えば特許文献２参照）。   Also, a configuration is disclosed in which the diaphragm is reinforced with a rigidity imparting member or the like in order to prevent the meandering coil pattern from being disconnected due to metal fatigue due to repeated vibration of the diaphragm (see, for example, Patent Document 2). ).

また、従来から、上記の電磁変換器と同様の構成で、上記の永久磁石に替えて棒状磁石で構成した「ガムーゾン型」と呼ばれる薄型スピーカが存在している。このガムーゾン型スピーカでは、所定の間隔で隣り合う棒状磁石を交互に異なる極性で並べ、対向する棒状磁石の磁極を同一（Ｎ極とＮ極、またはＳ極とＳ極）に配置し、棒状磁石が中央に配置された振動板を表裏方向から挟み込んでいる。その他の部材は上記の電磁変換器と同一の部材で構成される。このような薄型スピーカは、ポリエステル、ポリイミド等からなる基材に銅やアルミニウムなどの金属導体の箔を蒸着もしくは接着した振動板部材に、コイルパターンをエッチングにより配置した振動板を有している（例えば、非特許文献１参照）。この薄型スピーカも上記の電磁変換器と同様の音波発生動作でオーディオ再生を行う。   Conventionally, there is a thin speaker called “gummazone type” having a configuration similar to that of the above-described electromagnetic transducer and configured with a rod-shaped magnet instead of the permanent magnet. In this Gamson type speaker, bar magnets adjacent to each other at predetermined intervals are alternately arranged with different polarities, and the poles of the opposing bar magnets are arranged to be the same (N pole and N pole, or S pole and S pole). Is sandwiched in the center from the front and back. The other members are composed of the same members as the above electromagnetic transducer. Such a thin speaker has a diaphragm in which a coil pattern is disposed by etching on a diaphragm member obtained by depositing or bonding a foil of a metal conductor such as copper or aluminum on a base material made of polyester, polyimide, or the like ( For example, refer nonpatent literature 1). This thin speaker also performs audio reproduction with the same sound wave generation operation as the electromagnetic transducer.

これら従来の電磁変換器には、薄く柔軟な高分子フィルムからなる平板形状の振動板が用いられている。   In these conventional electromagnetic transducers, a flat diaphragm made of a thin and flexible polymer film is used.

特許第３１９２３７２号公報Japanese Patent No. 3192372 国際公開ＷＯ２００３／０７３７８７号公報International Publication WO2003 / 073787

山本武雄編著、スピーカー・システム、ラジオ技術社、１９７７年７月発行Edited by Takeo Yamamoto, Speaker System, Radio Technology, July 1977

しかしながら、上述した従来の電磁変換器は、薄く柔軟な高分子フィルムからなる平板形状の振動板が用いられており、低音域を再生する場合、振動板が振動する際に振動板が共振して異音を発生するという課題があった。また、振動板が共振することにより、性能が悪いという課題があった。   However, the above-described conventional electromagnetic transducer uses a flat diaphragm made of a thin and flexible polymer film. When reproducing a low frequency range, the diaphragm resonates when the diaphragm vibrates. There was a problem of generating abnormal noise. Further, there has been a problem that the performance is poor due to resonance of the diaphragm.

この発明は、上述した課題を解決するためになされたもので、異音の発生を抑制した性能の良い電磁変換器を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object thereof is to provide an electromagnetic transducer with good performance that suppresses the generation of abnormal noise.

この発明に係る電磁変換器は、組み合わせた際に空洞の内部を形成する一対のフレームと、フレームの内部に配置され、磁束を集中させるプレートが設けられた永久磁石と、プレートにより集中された磁束を受けるようコイルパターンが振動膜の長手側面に配置され、当該長手側面に配置されたコイルパターン間をつなぐコイルパターンが上記振動膜の天面または底面に配置された振動板とを備え、振動板の厚さが均一で凹凸形状の立体構造に形成されているものである。

The electromagnetic transducer according to the present invention includes a pair of frames that form the inside of a cavity when combined, a permanent magnet that is disposed inside the frame and is provided with a plate that concentrates magnetic flux, and a magnetic flux that is concentrated by the plate. A coil pattern is disposed on a longitudinal side surface of the diaphragm, and a coil pattern connecting between the coil patterns disposed on the longitudinal side surface is provided on a top surface or a bottom surface of the diaphragm. Are formed in a three-dimensional structure with a uniform uneven shape.

この発明に係る電磁変換器によれば、振動板は、厚さが均一で凹凸形状の立体構造に形成されたことにより、振動板自体の剛性を向上させることができ、低音域を再生する場合であっても、振動板が振動する際に振動板の共振が生じにくく、異音の発生を抑制することができる。また、振動板の共振を抑制するので、性能を良くすることができる。   According to the electromagnetic transducer according to the present invention, when the diaphragm is formed in a three-dimensional structure having a uniform thickness and an uneven shape, the rigidity of the diaphragm itself can be improved, and the low frequency range is reproduced. Even when the diaphragm vibrates, resonance of the diaphragm is unlikely to occur, and generation of abnormal noise can be suppressed. In addition, since the resonance of the diaphragm is suppressed, the performance can be improved.

実施の形態１の電磁変換器の外観を示しており、図１（ａ）が外観前面図、図１（ｂ）及び図１（ｃ）が外観側面図、図１（ｄ）が外観背面図である。FIGS. 1A and 1B show an external appearance of the electromagnetic transducer according to the first embodiment, FIG. 1A is an external front view, FIGS. 1B and 1C are external side views, and FIG. It is. 実施の形態１の電磁変換器の構成を示す断面図であり、図２（ａ）が図１（ａ）のＡ−Ａ線断面図であり、図２（ｂ）が図１（ａ）のＢ−Ｂ線断面図である。It is sectional drawing which shows the structure of the electromagnetic transducer of Embodiment 1, FIG. 2 (a) is AA sectional view taken on the line of FIG. 1 (a), FIG.2 (b) is FIG.1 (a). It is a BB sectional view. 実施の形態１の振動板の外観斜視図である。3 is an external perspective view of a diaphragm according to Embodiment 1. FIG. 実施の形態１の電磁変換器の他の振動板の外観を示す斜視図である。FIG. 6 is a perspective view illustrating an appearance of another diaphragm of the electromagnetic transducer according to the first embodiment. 実施の形態１の電磁変換器の他の振動板の外観を示す斜視図である。FIG. 6 is a perspective view illustrating an appearance of another diaphragm of the electromagnetic transducer according to the first embodiment. 実施の形態１の電磁変換器の他の振動板の外観を示す斜視図である。FIG. 6 is a perspective view illustrating an appearance of another diaphragm of the electromagnetic transducer according to the first embodiment. 実施の形態１の電磁変換器の他の振動板の外観を示す斜視図である。FIG. 6 is a perspective view illustrating an appearance of another diaphragm of the electromagnetic transducer according to the first embodiment. 実施の形態２の電磁変換器の外観を示しており、図８（ａ）が外観前面図、図８（ｂ）及び図８（ｃ）が外観側面図、図８（ｄ）が外観背面図である。8A and 8B show the external appearance of an electromagnetic transducer according to a second embodiment, in which FIG. 8A is an external front view, FIGS. 8B and 8C are external side views, and FIG. 8D is an external rear view. It is. 実施の形態２の電磁変換器の構成を示す断面図であり、図９（ａ）が図８（ａ）のＣ−Ｃ線断面図、図９（ｂ）が図８（ａ）のＤ−Ｄ線断面図である。It is sectional drawing which shows the structure of the electromagnetic transducer of Embodiment 2, Fig.9 (a) is CC sectional view taken on the line of Fig.8 (a), FIG.9 (b) is D- of Fig.8 (a). It is D line sectional drawing. 実施の形態２の振動板の外観斜視図である。6 is an external perspective view of a diaphragm according to Embodiment 2. FIG. 実施の形態２の電磁変換器の他の振動板の外観斜視図である。6 is an external perspective view of another diaphragm of the electromagnetic transducer according to Embodiment 2. FIG. 実施の形態２の電磁変換器の他の振動板の外観斜視図である。6 is an external perspective view of another diaphragm of the electromagnetic transducer according to Embodiment 2. FIG. 実施の形態２の電磁変換器の他の振動板の外観斜視図である。6 is an external perspective view of another diaphragm of the electromagnetic transducer according to Embodiment 2. FIG.

以下、この発明をより詳細に説明するために、この発明を実施するための形態について、添付の図面に従って説明する。
実施の形態１．
図１は、この発明の実施の形態１の電磁変換器１０の外観を示しており、図１（ａ）が電磁変換器１０の外観を示す前面図、図１（ｂ）が長手側面から見た電磁変換器１０の外観を示す側面図、図１（ｃ）が短手側面から見た電磁変換器１０の外観を示す側面図、図１（ｄ）が電磁変換器１０の外観を示す背面図である。Hereinafter, in order to explain the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
1A and 1B show the external appearance of an electromagnetic transducer 10 according to Embodiment 1 of the present invention. FIG. 1A is a front view showing the external appearance of the electromagnetic transducer 10, and FIG. 1C is a side view showing the appearance of the electromagnetic transducer 10, FIG. 1C is a side view showing the appearance of the electromagnetic transducer 10 viewed from the short side, and FIG. 1D is a rear view showing the appearance of the electromagnetic transducer 10. FIG.

図１（ａ）、図１（ｄ）に示すように、電磁変換器１０は、フレーム１５に一定の間隔をおいて形成された音放射孔１５ａを両面に有しており、図１（ｂ）、図１（ｃ）に示すように、フレーム１５は、上側フレーム１６及び下側フレーム１７を組み合わせて構成されている。なお、説明のため、上側フレーム１６と下側フレーム１７とで上下の区別をつけているが、図１（ａ）〜図１（ｄ）に示すように、上側フレーム１６及び下側フレーム１７の形状は略同一であり、上下を反転させた構成であっても良い。   As shown in FIGS. 1 (a) and 1 (d), the electromagnetic transducer 10 has sound radiation holes 15a formed on a frame 15 at regular intervals, on both sides. 1) As shown in FIG. 1C, the frame 15 is configured by combining an upper frame 16 and a lower frame 17. For the sake of explanation, the upper frame 16 and the lower frame 17 are distinguished from each other up and down, but as shown in FIGS. 1A to 1D, the upper frame 16 and the lower frame 17 The shape may be substantially the same, and the structure which turned upside down may be sufficient.

図２は、この発明の実施の形態１の電磁変換器１０の構成を示す断面図であり、図２（ａ）は、図１（ａ）に示すＡ−Ａ線に沿って切断した場合の電磁変換器１０の断面図である。   2 is a cross-sectional view showing the configuration of the electromagnetic transducer 10 according to the first embodiment of the present invention. FIG. 2 (a) is a view taken along line AA shown in FIG. 1 (a). 1 is a cross-sectional view of an electromagnetic transducer 10.

図２（ａ）に示すように、電磁変換器１０は、フレーム１５、振動板２１、振動板支持材２４、上側永久磁石３２、下側永久磁石３３、プレート３８から構成されている。フレーム１５は、上側フレーム１６と下側フレーム１７とを組み合わせた際に空洞の内部を形成する筺体構造であり、フレーム１５の空洞の内部に振動板２１、振動板支持材２４、永久磁石３２，３３、プレート３８を覆うように収容している。   As shown in FIG. 2A, the electromagnetic transducer 10 includes a frame 15, a diaphragm 21, a diaphragm support member 24, an upper permanent magnet 32, a lower permanent magnet 33, and a plate 38. The frame 15 has a housing structure that forms an interior of a cavity when the upper frame 16 and the lower frame 17 are combined. The diaphragm 21, the diaphragm support member 24, the permanent magnet 32, 33, which is accommodated so as to cover the plate 38.

また、図２（ａ）に示すように、振動板２１は、数十ミクロンから数百ミクロンの薄い高分子フィルムからなり、厚さを略均一にした振動膜２１ａを凹凸形状の立体構造となるよう形成しており、振動膜２１ａの表面には、電気導体からなるコイルパターン２１ｂを形成している。コイルパターン２１ｂは、銅やアルミの電気導体の箔をエッチングやプレスなどにより打ち抜いて形成され、振動膜２１ａの表面に接着されている。この振動板２１の短手端部と下側フレーム１７の内壁面には、振動板支持材２４が取り付けられており、振動板２１は振動板支持材２４を介して下側フレーム１７に振動可能に支持されている。   Further, as shown in FIG. 2A, the diaphragm 21 is made of a thin polymer film of several tens to several hundreds of microns, and the vibration film 21a having a substantially uniform thickness has a three-dimensional structure with an uneven shape. The coil pattern 21b made of an electric conductor is formed on the surface of the vibration film 21a. The coil pattern 21b is formed by punching a copper or aluminum electric conductor foil by etching or pressing, and is bonded to the surface of the vibration film 21a. A diaphragm support member 24 is attached to the short end of the diaphragm 21 and the inner wall surface of the lower frame 17, and the diaphragm 21 can vibrate to the lower frame 17 via the diaphragm support member 24. It is supported by.

また、図２（ａ）に示すように、上側フレーム１６と下側フレーム１７の対向する内壁面には、永久磁石３２，３３が配置されている。永久磁石３２は、上側フレーム１６の内壁面に取り付けられており、永久磁石３３は、下側フレーム１７の内壁面に取り付けられており、永久磁石３２に対向する下側フレーム１７の位置には永久磁石３３は配置されていない。また、永久磁石３３に対向する上側フレーム１６の位置には永久磁石３２は配置されていない。よって、永久磁石３２，３３は、上側フレーム１６及び下側フレーム１７の対向する内壁面に互い違いに千鳥配置で取り付けられている。   Further, as shown in FIG. 2A, permanent magnets 32 and 33 are disposed on the inner wall surfaces of the upper frame 16 and the lower frame 17 facing each other. The permanent magnet 32 is attached to the inner wall surface of the upper frame 16, and the permanent magnet 33 is attached to the inner wall surface of the lower frame 17, and is permanently located at the position of the lower frame 17 facing the permanent magnet 32. The magnet 33 is not arranged. Further, the permanent magnet 32 is not arranged at the position of the upper frame 16 facing the permanent magnet 33. Accordingly, the permanent magnets 32 and 33 are alternately attached to the opposing inner wall surfaces of the upper frame 16 and the lower frame 17 in a staggered arrangement.

また、図２（ａ）に示すように、永久磁石３２の磁極は、上側フレーム１６に固定されている面がＮ極、上側フレーム１６に固定されている面に相対する面がＳ極であり、永久磁石３３の磁極は、下側フレーム１７に固定されている面がＳ極、下側フレーム１７に固定されている面に相対する面がＮ極である。よって、永久磁石３２，３３は同一の磁極方向で着磁されている。   As shown in FIG. 2A, the magnetic poles of the permanent magnet 32 have N poles on the surface fixed to the upper frame 16 and S poles on the surface facing the surface fixed on the upper frame 16. As for the magnetic poles of the permanent magnet 33, the surface fixed to the lower frame 17 is the S pole, and the surface opposite to the surface fixed to the lower frame 17 is the N pole. Therefore, the permanent magnets 32 and 33 are magnetized in the same magnetic pole direction.

また、図２（ａ）に示すように、永久磁石３２の上側フレーム１６に固定されている面に相対する面及び永久磁石３３の下側フレーム１７に固定されている面に相対する面には、プレート３８が載置されており、プレート３８が水平方向に一定の間隔をあけて一直線上に並んで配置されている。プレート３８は、鉄板などの磁性体で構成され、永久磁石３２，３３の磁束を水平方向に隣り合うプレート３８へ集中させるヨークとして作用している。   Further, as shown in FIG. 2A, the surface facing the surface fixed to the upper frame 16 of the permanent magnet 32 and the surface facing the surface fixed to the lower frame 17 of the permanent magnet 33 are The plate 38 is placed, and the plates 38 are arranged in a straight line at a certain interval in the horizontal direction. The plate 38 is made of a magnetic material such as an iron plate, and functions as a yoke that concentrates the magnetic flux of the permanent magnets 32 and 33 on the plates 38 adjacent in the horizontal direction.

さらに、図２（ａ）に示すように、振動板２１の振動膜２１ａは、永久磁石３３とフレーム１５との間、プレート３８と上側フレーム１６との間、プレート３８と下側フレーム１７との間、及びプレート３８間を通るように凹凸形状に形成されており、凹凸形状の降り曲がった立ち上がり及び立ち下がりの部分は略垂直になるよう形成されている。コイルパターン２１ｂは、フレーム１５とプレート３８の間、及びプレート３８間に形成されている。この構成により、ヨークとしてのプレート３８により磁力を集中させた位置にコイルパターン２１ｂが配置されている。   Further, as shown in FIG. 2A, the diaphragm 21 a of the diaphragm 21 is formed between the permanent magnet 33 and the frame 15, between the plate 38 and the upper frame 16, and between the plate 38 and the lower frame 17. It is formed in a concavo-convex shape so as to pass between and between the plates 38, and the rising and falling portions of the concavo-convex shape are formed to be substantially vertical. The coil pattern 21 b is formed between the frame 15 and the plate 38 and between the plates 38. With this configuration, the coil pattern 21b is arranged at a position where the magnetic force is concentrated by the plate 38 as a yoke.

図２（ｂ）は、図１（ａ）に示すＢ−Ｂ線に沿って切断した場合の電磁変換器１０の断面図である。図２（ｂ）に示すように、振動板２１の長手端部と下側フレーム１７との間には、振動板支持材２４が取り付けられている。また、上述したように振動板２１の短手端部にも振動板支持材２４が取り付けられている。よって、振動板支持材２４が振動板２１の外周端部と下側フレーム１７との間に取り付けられており、振動板２１は、振動板支持材２４を介して下側フレーム１７に振動可能に支持されている。   FIG. 2B is a cross-sectional view of the electromagnetic transducer 10 when cut along the line BB shown in FIG. As shown in FIG. 2B, a diaphragm support member 24 is attached between the longitudinal end portion of the diaphragm 21 and the lower frame 17. Further, as described above, the diaphragm support member 24 is also attached to the short end portion of the diaphragm 21. Therefore, the diaphragm support member 24 is attached between the outer peripheral end of the diaphragm 21 and the lower frame 17, and the diaphragm 21 can vibrate to the lower frame 17 via the diaphragm support member 24. It is supported.

図３は、実施の形態１の振動板２１の外観を斜めから見た斜視図である。
図３に示すように、振動板２１は、振動膜２１ａが凹凸形状の立体構造に形成されている。振動膜２１ａの表面には、電気導体からなるコイルパターン２１ｂが蛇行形状に形成されている。コイルパターン２１ｂの両端は、図示しない制御部等からのオーディオ信号がコイルパターン２１ｂに供給されるように外部と接続されている。FIG. 3 is a perspective view of the outer appearance of the diaphragm 21 according to the first embodiment as viewed obliquely.
As shown in FIG. 3, the diaphragm 21 has a vibration film 21 a having a three-dimensional structure with an uneven shape. A coil pattern 21b made of an electric conductor is formed in a meandering shape on the surface of the vibration film 21a. Both ends of the coil pattern 21b are connected to the outside so that an audio signal from a control unit (not shown) is supplied to the coil pattern 21b.

また、図３に示すように、振動板２１の外周部には、皺状の重なり部２１ｃが形成されており、重なり部２１ｃは、振動膜２１ａを皺状に形成し重ね合わせ厚みを作ることで、振動板２１外周部の強度を向上させている。   Further, as shown in FIG. 3, a flange-like overlapping portion 21 c is formed on the outer peripheral portion of the diaphragm 21, and the overlapping portion 21 c forms the vibrating membrane 21 a in a hook-like shape so as to make an overlapping thickness. Thus, the strength of the outer peripheral portion of the diaphragm 21 is improved.

次に、電磁変換器１０の動作原理について説明する。
電磁変換器１０では、永久磁石３２，３３に載置されたプレート３８間に高い磁束密度で磁界が発生している。外部から振動板２１上のコイルパターン２１ｂにオーディオ信号としての電流が供給されると、プレート３８間の磁束とコイルパターン２１ｂに流れる電流とが作用することにより、永久磁石３２，３３上のプレート３８と振動板２１のコイルパターン２１ｂとが電磁的に結合し、コイルパターン２１ｂには、フレミングの法則にしたがって駆動力が発生する。コイルパターン２１ｂが駆動されることで振動板２１が振動し、振動板２１の振動によりフレーム１５内の空気が振動する。フレーム１５内の空気の振動は、オーディオ振動として音放射孔１５ａから外部に放射される。Next, the operation principle of the electromagnetic transducer 10 will be described.
In the electromagnetic transducer 10, a magnetic field is generated with a high magnetic flux density between the plates 38 placed on the permanent magnets 32 and 33. When a current as an audio signal is supplied to the coil pattern 21b on the diaphragm 21 from the outside, the magnetic flux between the plates 38 and the current flowing in the coil pattern 21b act, thereby causing the plates 38 on the permanent magnets 32 and 33 to operate. And the coil pattern 21b of the diaphragm 21 are electromagnetically coupled, and a driving force is generated in the coil pattern 21b in accordance with Fleming's law. When the coil pattern 21 b is driven, the diaphragm 21 vibrates, and the air in the frame 15 vibrates due to the vibration of the diaphragm 21. The vibration of the air in the frame 15 is radiated to the outside from the sound radiation hole 15a as audio vibration.

次に振動板２１の剛性を高める構成について説明する。
図３に示すように、振動板２１は、厚さを略均一にした薄膜からなる振動膜２１ａにより凹凸形状の立体構造に形成されたことにより、従来の平板形状の振動板に比べ振動板自体の剛性が向上している。Next, a configuration for increasing the rigidity of the diaphragm 21 will be described.
As shown in FIG. 3, the diaphragm 21 is formed in a three-dimensional structure having an uneven shape by a diaphragm 21 a made of a thin film having a substantially uniform thickness, so that the diaphragm itself is compared with a conventional plate-shaped diaphragm. The rigidity is improved.

また、図３に示すように、振動板２１の外周部には、振動膜２１ａを皺状に形成し重ね合わせた重なり部２１ｃを形成したことにより、振動板２１外周部の剛性を向上させている。   Further, as shown in FIG. 3, the rigidity of the outer peripheral portion of the diaphragm 21 is improved by forming an overlapping portion 21c in which the diaphragm 21a is formed in a bowl shape on the outer peripheral portion of the diaphragm 21 and overlapped. Yes.

なお、振動板２１の剛性を向上させる構成であれば、他の構成であってもよい。
ここで、振動板２１の剛性を向上させる他の構成の例について説明する。
図４は、実施の形態１の電磁変換器１０の他の振動板２１の外観を示す斜視図であり、図３の重なり部２１ｃに替えて、補強用コイルパターン２１ｄを形成している。補強用コイルパターン２１ｄは、振動板２１のコイルパターン２１ｂ間、すなわち振動板２１の凸形状表面の長手方向及び長手方向に略直角の短手方向に形成されており、コイルパターン２１ｂとは電気的にも切り離されて形成されている。Any other configuration may be used as long as the rigidity of the diaphragm 21 is improved.
Here, an example of another configuration for improving the rigidity of the diaphragm 21 will be described.
FIG. 4 is a perspective view showing the appearance of another diaphragm 21 of the electromagnetic transducer 10 according to the first embodiment, and a reinforcing coil pattern 21d is formed instead of the overlapping portion 21c of FIG. The reinforcing coil pattern 21d is formed between the coil patterns 21b of the diaphragm 21, that is, in the longitudinal direction of the convex surface of the diaphragm 21 and in the short direction substantially perpendicular to the longitudinal direction. The coil pattern 21b is electrically Also formed separately.

図５は、実施の形態１の電磁変換器１０の他の振動板２１の外観を示す斜視図であり、図４の補強コイルパターン２１ｄに替えて、補強リブ２１ｅを形成している。補強リブ２１ｅは、振動板２１表面のコイルパターン２１ｂの間、即ち振動板２１の凸形状上面の短手方向に溝形状を形成している。   FIG. 5 is a perspective view showing the appearance of another diaphragm 21 of the electromagnetic transducer 10 according to the first embodiment, and a reinforcing rib 21e is formed instead of the reinforcing coil pattern 21d of FIG. The reinforcing rib 21e forms a groove shape between the coil patterns 21b on the surface of the diaphragm 21, that is, in the short direction of the convex upper surface of the diaphragm 21.

図６は、実施の形態１の電磁変換器１０の他の振動板２１の外観を示す斜視図であり、図３の重なり部２１ｃに替えて、補強板２１ｆを設けている。補強板２１ｆは、振動板２１の材質と同等又は比重の小さい材質から構成され、振動板２１の凸形状の隣り合う長手端部同士を繋ぐように設けられており、振動板２１の凸形状を補強している。   FIG. 6 is a perspective view showing the appearance of another diaphragm 21 of the electromagnetic transducer 10 according to the first embodiment, and a reinforcing plate 21f is provided instead of the overlapping portion 21c of FIG. The reinforcing plate 21f is made of a material that is equal to or smaller in specific gravity than the material of the diaphragm 21, and is provided so as to connect adjacent longitudinal ends of the convex shape of the diaphragm 21, and the convex shape of the diaphragm 21 is It is reinforced.

図７は、実施の形態１の電磁変換器１０の他の振動板２１の外観を示す斜視図であり、図６の補強板２１ｆに替えて、補強板２１ｇを設けている。補強板２１ｇは、振動板２１の材質と同等又は比重の小さい材質から構成され、振動板２１の凸形状の内壁面又は凸形状の外壁面に設けられており、振動板２１の凸形状を補強している。なお、図示しないが、振動板２１の内壁面に沿って補強板２１ｇを設ける場合、永久磁石３２，３３及びプレート３８は、分割もしくは切り欠いた構造になっており、振動板２１が振動しても補強板２１ｇがプレート３８や永久磁石３２，３３に接触しない構成となっている。   FIG. 7 is a perspective view showing the appearance of another diaphragm 21 of the electromagnetic transducer 10 according to the first embodiment, and a reinforcing plate 21g is provided instead of the reinforcing plate 21f of FIG. The reinforcing plate 21g is made of a material having the same or smaller specific gravity as the material of the diaphragm 21, and is provided on the convex inner wall surface or the convex outer wall surface of the diaphragm 21, and reinforces the convex shape of the diaphragm 21. is doing. Although not shown, when the reinforcing plate 21g is provided along the inner wall surface of the diaphragm 21, the permanent magnets 32 and 33 and the plate 38 are divided or notched, and the diaphragm 21 vibrates. Further, the reinforcing plate 21g does not come into contact with the plate 38 or the permanent magnets 32 and 33.

以上のように、実施の形態１の電磁変換器１０によれば、振動板２１は、厚さを略均一にした薄膜からなる振動膜２１ａにより凹凸形状の立体構造に形成されると共に、プレート３８により集中された磁束を受けるコイルパターン２１ｂが振動膜上に形成されたことにより、振動板２１自体の剛性を向上させることができ、低音域を再生する場合であっても、振動板２１が振動する際に振動板２１の共振が生じにくく、異音の発生を抑制することができるという効果が得られる。また、振動板２１の共振を抑制するので、性能が良くなるという効果を奏する。   As described above, according to the electromagnetic transducer 10 of the first embodiment, the vibration plate 21 is formed into a three-dimensional structure having an uneven shape by the vibration film 21a made of a thin film having a substantially uniform thickness, and the plate 38 is also formed. Since the coil pattern 21b receiving the concentrated magnetic flux is formed on the diaphragm, the rigidity of the diaphragm 21 itself can be improved, and the diaphragm 21 can vibrate even when reproducing the low frequency range. When this is done, resonance of the diaphragm 21 is unlikely to occur, and the effect that generation of abnormal noise can be suppressed is obtained. Moreover, since the resonance of the diaphragm 21 is suppressed, there is an effect that the performance is improved.

また、実施の形態１の電磁変換器１０によれば、振動板２１の外周部には、振動膜２１ａを皺状に形成し重ね合わせた重なり部２１ｃを形成したことにより、振動板２１外周部の剛性が向上して振動板２１が変形せず、より異音の発生を抑制することができるという効果が得られる。   Further, according to the electromagnetic transducer 10 of the first embodiment, the outer peripheral portion of the diaphragm 21 is formed on the outer peripheral portion of the diaphragm 21 by forming the overlapping portion 21c in which the diaphragm 21a is formed in a bowl shape and overlapped. This improves the rigidity of the diaphragm 21 and prevents the vibration plate 21 from being deformed.

また、実施の形態１の電磁変換器１０によれば、振動板２１の凸形状の表面にコイルパターン２１ｂと電気的に切り離した補強用コイルパターン２１ｄを形成したことにより、振動板２１の剛性が向上して振動板２１が変形せず、異音の発生を抑制することができるという効果が得られる。   Moreover, according to the electromagnetic transducer 10 of Embodiment 1, the rigidity of the diaphragm 21 is increased by forming the reinforcing coil pattern 21d electrically separated from the coil pattern 21b on the convex surface of the diaphragm 21. As a result, the diaphragm 21 is not deformed, and an effect that the generation of abnormal noise can be suppressed is obtained.

また、実施の形態１の電磁変換器１０によれば、振動板２１表面のコイルパターン２１ｂの間、即ち凸形状上面に溝形状の補強リブ２１ｅを形成したことにより、振動板２１の剛性が向上して振動板２１が変形せず、異音の発生を抑制することができるという効果が得られる。   Moreover, according to the electromagnetic transducer 10 of Embodiment 1, the rigidity of the diaphragm 21 is improved by forming the groove-shaped reinforcing rib 21e between the coil patterns 21b on the surface of the diaphragm 21, that is, on the convex upper surface. Thus, the diaphragm 21 is not deformed, and an effect that the generation of abnormal noise can be suppressed is obtained.

また、実施の形態１の電磁変換器１０によれば、振動板２１の材質と同等又は比重の小さい材質からなる補強板２１ｆ，２１ｇで振動板２１の凸形状を補強したことにより、振動板２１の剛性が向上して振動板２１が変形せず、異音の発生を抑制することができるという効果が得られる。   In addition, according to the electromagnetic transducer 10 of the first embodiment, the convex shape of the diaphragm 21 is reinforced by the reinforcing plates 21f and 21g made of a material that is the same as or smaller in the specific gravity of the diaphragm 21. Therefore, the vibration 21 is not deformed and the generation of abnormal noise can be suppressed.

さらに、振動板２１の凹凸形状の立ち上がり部を略垂直に形成したことにより、永久磁石３２，３３間の磁気ギャップを狭くすることができ、磁気回路の磁束密度を大きくすることができる。   Furthermore, by forming the concavo-convex rising portions of the diaphragm 21 substantially vertically, the magnetic gap between the permanent magnets 32 and 33 can be narrowed, and the magnetic flux density of the magnetic circuit can be increased.

実施の形態２．
実施の形態１では、永久磁石３２，３３が複数設けられた構成について説明したが、実施の形態２は、電磁変換器１０の寸法を小型化する構成について図８〜図１３を用いて説明する。なお、説明の重複を避けるため、実施の形態１と同一の構成については、同一の符号を付し、その説明を省略する。Embodiment 2. FIG.
In the first embodiment, the configuration in which a plurality of permanent magnets 32 and 33 are provided has been described. In the second embodiment, the configuration for reducing the size of the electromagnetic transducer 10 will be described with reference to FIGS. 8 to 13. . In addition, in order to avoid duplication of description, the same code | symbol is attached | subjected about the structure same as Embodiment 1, and the description is abbreviate | omitted.

図８は、この発明の実施の形態２の電磁変換器１０の外観を示しており、図８（ａ）が電磁変換器１０の外観を示す前面図、図８（ｂ）が長手側面から見た電磁変換器１０の外観を示す側面図、図８（ｃ）が短手側面から見た電磁変換器１０の外観を示す側面図、図８（ｄ）が電磁変換器１０の外観を示す背面図である。   8A and 8B show the external appearance of the electromagnetic transducer 10 according to the second embodiment of the present invention. FIG. 8A is a front view showing the external appearance of the electromagnetic transducer 10, and FIG. 8C is a side view showing the external appearance of the electromagnetic transducer 10, FIG. 8C is a side view showing the external appearance of the electromagnetic transducer 10 viewed from the short side, and FIG. 8D is a rear view showing the external appearance of the electromagnetic transducer 10. FIG.

図８（ａ）に示すように、上側フレーム１６は、音放射孔１５ａとともに、上側フレーム１６の中央部に音放射孔１５ａよりも大きい音放射孔１５ｂが形成されており、音放射孔１５ｂは、振動板２１の凸形状と略同じ大きさである。   As shown in FIG. 8 (a), the upper frame 16 has a sound radiation hole 15b that is larger than the sound radiation hole 15a at the center of the upper frame 16 together with the sound radiation hole 15a. The size is substantially the same as the convex shape of the diaphragm 21.

図８（ｂ）及び図８（ｃ）に示すように、上側フレーム１６は、平板形状であり、下側フレーム１７の一面を覆って空洞の内部を形成するように構成されており、上側フレーム１６の音放射孔１５ｂから、振動板２１が外部に露出している。   As shown in FIGS. 8B and 8C, the upper frame 16 has a flat plate shape and is configured to cover one surface of the lower frame 17 to form the interior of the cavity. The diaphragm 21 is exposed to the outside through the 16 sound radiation holes 15b.

図８（ｄ）に示すように、下側フレーム１７には、音放射孔１５ａが形成されているが、音放射孔１５ｂは形成されていない。   As shown in FIG. 8D, the sound emission hole 15a is formed in the lower frame 17, but the sound emission hole 15b is not formed.

図９は、この発明の実施の形態２の電磁変換器１０の構成を示す断面図であり、図９（ａ）は、図８（ａ）に示すＣ−Ｃ線に沿って切断した場合の電磁変換器１０の断面図である。   FIG. 9 is a cross-sectional view showing the configuration of the electromagnetic transducer 10 according to the second embodiment of the present invention, and FIG. 9A is a cross-sectional view taken along the line CC shown in FIG. 1 is a cross-sectional view of an electromagnetic transducer 10.

図９（ａ）に示すように、上側フレーム１６は、中央部に音放射孔１５ｂが形成されており、音放射孔１５ｂと所定の間隔をあけて音放射孔１５ａが形成されている。   As shown in FIG. 9A, the upper frame 16 has a sound radiation hole 15b formed at the center, and the sound radiation hole 15a is formed at a predetermined interval from the sound radiation hole 15b.

また、図９（ａ）に示すように、永久磁石３３は、下側フレーム１７の上側フレーム１６と対向する内壁面の中央に配置固定されており、永久磁石３３の下側フレーム１７の固定された面に相対する面にはヨークとしてのプレート３８が載置されている。プレート３８は、上側フレーム１６の水平方向に一直線上に配置されており、上側フレーム１６との間に磁束密度の高い磁界を発生させている。   9A, the permanent magnet 33 is disposed and fixed at the center of the inner wall surface of the lower frame 17 facing the upper frame 16, and the lower frame 17 of the permanent magnet 33 is fixed. A plate 38 serving as a yoke is placed on the surface opposite to the surface. The plate 38 is arranged in a straight line in the horizontal direction of the upper frame 16, and generates a magnetic field having a high magnetic flux density between the plate 38 and the upper frame 16.

さらに、図９（ａ）に示すように、振動膜２１ａが永久磁石３３と下側フレーム１７との間、プレート３８と上側フレーム１６との間、プレート３８と対向する位置を通る凸形状に形成されており、また、コイルパターン２１ｂがプレート３８と上側フレーム１６との間に形成されている。   Further, as shown in FIG. 9A, the vibrating membrane 21a is formed in a convex shape passing through the position between the permanent magnet 33 and the lower frame 17, between the plate 38 and the upper frame 16, and the position facing the plate 38. The coil pattern 21 b is formed between the plate 38 and the upper frame 16.

図９（ｂ）は、図８（ａ）に示すＤ−Ｄ線に沿って切断した場合の電磁変換器１０の断面図である。図９（ｂ）に示すように、振動板２１の凸形状の上面は、上側フレーム１６の音放射孔１５ｂから突出して露出している。   FIG.9 (b) is sectional drawing of the electromagnetic transducer 10 at the time of cut | disconnecting along the DD line | wire shown to Fig.8 (a). As shown in FIG. 9B, the convex upper surface of the diaphragm 21 protrudes from the sound radiation hole 15b of the upper frame 16 and is exposed.

なお、電磁変換器１０の動作原理については、実施の形態１と同様である。   The operation principle of the electromagnetic transducer 10 is the same as that in the first embodiment.

次に振動板２１の剛性を高める構成について説明する。
図１０は、実施の形態２の振動板２１を斜めから見た斜視図である。
図１０に示すように、振動板２１は、厚さを略均一にした薄膜からなる振動膜２１ａにより凹凸形状の立体構造に形成されると共に、プレート３８により集中された磁束を受けるコイルパターン２１ｂが振動膜上に形成されたことにより、従来の平板形状の振動板に比べ振動板自体の剛性が向上している。Next, a configuration for increasing the rigidity of the diaphragm 21 will be described.
FIG. 10 is a perspective view of the diaphragm 21 according to the second embodiment as viewed from an oblique direction.
As shown in FIG. 10, the diaphragm 21 is formed in a three-dimensional structure having an uneven shape by a diaphragm 21 a made of a thin film having a substantially uniform thickness, and a coil pattern 21 b that receives magnetic flux concentrated by a plate 38 is formed. By being formed on the diaphragm, the rigidity of the diaphragm itself is improved as compared with the conventional flat diaphragm.

また、図１０に示すように、振動板２１の外周部には、振動膜２１ａを皺状に形成し重ね合わせた重なり部２１ｃを形成したことにより、振動板２１外周部の剛性を向上させている。   Further, as shown in FIG. 10, the outer peripheral portion of the diaphragm 21 is formed with an overlapping portion 21 c in which the diaphragm 21 a is formed in a bowl shape and overlapped, thereby improving the rigidity of the outer peripheral portion of the diaphragm 21. Yes.

なお、実施の形態１と同様に、振動板２１の剛性を向上させる構成であれば、他の構成であってもよい。
ここで、振動板２１の剛性を向上させる他の構成について示す。
図１１は、実施の形態２の電磁変換器１０の他の振動板２１の外観を示す斜視図であり、図１０の重なり部２１ｃに替えて、振動板２１の凸形状表面に補強用コイルパターン２１ｄを形成している。Similar to the first embodiment, any other configuration may be used as long as the rigidity of the diaphragm 21 is improved.
Here, another configuration for improving the rigidity of the diaphragm 21 will be described.
FIG. 11 is a perspective view illustrating an appearance of another diaphragm 21 of the electromagnetic transducer 10 according to the second embodiment, and a reinforcing coil pattern is formed on the convex surface of the diaphragm 21 instead of the overlapping portion 21c of FIG. 21d is formed.

図１２は、実施の形態２の電磁変換器１０の他の振動板２１の外観を示す斜視図であり、図１１の補強コイルパターン２１ｄに替えて、補強リブ２１ｅを形成している。補強リブ２１ｅは、振動板２１表面のコイルパターン２１ｂの間、即ち凸形状上面の短手方向に溝形状を形成したものである。   FIG. 12 is a perspective view showing the appearance of another diaphragm 21 of the electromagnetic transducer 10 according to the second embodiment, and a reinforcing rib 21e is formed instead of the reinforcing coil pattern 21d of FIG. The reinforcing ribs 21e are formed in a groove shape between the coil patterns 21b on the surface of the diaphragm 21, that is, in the short direction of the convex upper surface.

図１３は、実施の形態２の電磁変換器１０の他の振動板２１の外観を示す斜視図であり、図１０の重なり部２１ｃに替えて、補強板２１ｇを設けている。補強板２１ｇは、振動板２１の凸形状の内壁面に設けられており、振動板２１の凸形状を補強している。   FIG. 13 is a perspective view showing the appearance of another diaphragm 21 of the electromagnetic transducer 10 according to the second embodiment, and a reinforcing plate 21g is provided instead of the overlapping portion 21c of FIG. The reinforcing plate 21g is provided on the convex inner wall surface of the diaphragm 21, and reinforces the convex shape of the diaphragm 21.

以上のように、実施の形態２の電磁変換器１０によれば、実施の形態１の電磁変換器１０と同じ効果が得られると共に、電磁変換器１０の寸法を小型化することができるという効果が得られる。   As described above, according to the electromagnetic converter 10 of the second embodiment, the same effect as that of the electromagnetic converter 10 of the first embodiment can be obtained, and the size of the electromagnetic converter 10 can be reduced. Is obtained.

なお、実施の形態１，２において、蛇行形状のコイルパターン２１ｂが振動板１１の表面に形成されていると記載しているが、振動膜２１ａの両面にコイルパターン２１ｂを構成するものであっても良い。また、振動板２１にコイルパターン２１ｂが埋め込まれた構成であっても良い。   In the first and second embodiments, it is described that the meandering coil pattern 21b is formed on the surface of the diaphragm 11. However, the coil pattern 21b is configured on both surfaces of the vibration film 21a. Also good. Moreover, the structure by which the coil pattern 21b was embedded in the diaphragm 21 may be sufficient.

また、実施の形態１，２において、永久磁石１２，１３が３列及び１列の場合の例を示したが、その他の列数でも良く、振動板２１を同様に構成することで同様の効果が得られる。   In the first and second embodiments, the example in which the permanent magnets 12 and 13 have three rows and one row has been shown. However, other numbers of rows may be used, and the same effect can be obtained by configuring the diaphragm 21 in the same manner. Is obtained.

また、振動膜２１ａに補強用コイルパターン２１ｄを設ける例、振動膜２１ａに溝形状の補強リブ２１ｅを形成する例、振動板１１の外周部や内部に振動板２１の構成部品と同等または比重の小さい材料から成る補強板２１ｆ，２１ｇを設けた例を示したが、各々単独で用いても、複数用いても、組み合わせで構成しても良く、同様の効果が得られる。   Further, an example in which a reinforcing coil pattern 21d is provided on the diaphragm 21a, an example in which a groove-shaped reinforcing rib 21e is formed on the diaphragm 21a, and the same or specific gravity as the components of the diaphragm 21 on the outer periphery or inside of the diaphragm 11 Although an example in which the reinforcing plates 21f and 21g made of a small material are provided has been described, they may be used alone, in a plurality, or in combination, and similar effects can be obtained.

また、説明のため、上側フレーム１６と下側フレーム１７とで上下の区別をつけているが、上下を反転させた構成であっても良い。   For the sake of explanation, the upper frame 16 and the lower frame 17 are distinguished from each other up and down, but a configuration in which the upper and lower sides are inverted may be used.

また、本発明の実施の形態で示した各図は、わかりやすく説明するために誇張拡大して示しており、各構成の厚み等の関係は実際と異なるものである。   Each figure shown in the embodiment of the present invention is exaggerated and enlarged for easy understanding, and the relationship between the thicknesses of each component is different from the actual one.

以上のように、この発明に係る電磁変換器は、振動板自体の剛性を向上させることができ、低音域を再生する場合であっても、振動板が振動する際に振動板の共振が生じにくく、異音の発生を抑制することができると共に、振動板の共振を抑制して性能を良くすることができるので、オーディオシステムのスピーカなどに用いるのに適している。   As described above, the electromagnetic transducer according to the present invention can improve the rigidity of the diaphragm itself, and even when the low frequency range is reproduced, resonance of the diaphragm occurs when the diaphragm vibrates. It is difficult to suppress the generation of abnormal noise and can improve the performance by suppressing the resonance of the diaphragm, so that it is suitable for use in a speaker of an audio system.

Claims (5)

組み合わせた際に空洞の内部を形成する一対のフレームと、
上記フレームの内部に配置され、磁束を集中させるプレートが設けられた永久磁石と、
厚さを均一にした振動膜により凹凸形状の立体構造に形成されると共に、上記プレートにより集中された磁束を受けるコイルパターンが上記振動膜の長手側面に配置され、当該長手側面に配置されたコイルパターン間をつなぐコイルパターンが上記振動膜の天面または底面に配置された振動板とを備えた電磁変換器。A pair of frames that form the interior of the cavity when combined,
A permanent magnet disposed inside the frame and provided with a plate for concentrating the magnetic flux;
A coil pattern is formed on the longitudinal side surface of the vibrating membrane , and a coil pattern that receives the magnetic flux concentrated by the plate is formed by the vibrating membrane having a uniform thickness, and the magnetic flux concentrated by the plate An electromagnetic transducer comprising a diaphragm in which a coil pattern for connecting between patterns is disposed on a top surface or a bottom surface of the diaphragm. 上記振動板の長手両端外周には、皺状に形成し重ね合わせた重なり部が形成されていることを特徴とする請求項１記載の電磁変換器。The electromagnetic transducer according to claim 1, wherein an overlap portion formed in a bowl shape and overlapped is formed on the outer periphery of both ends of the diaphragm in the longitudinal direction . 上記振動板の表面に上記コイルパターンと電気的に切り離した補強用コイルパターンが形成されていることを特徴とする請求項１記載の電磁変換器。  The electromagnetic transducer according to claim 1, wherein a reinforcing coil pattern electrically separated from the coil pattern is formed on a surface of the diaphragm. 上記振動板表面のコイルパターンが形成されていない部分に溝形状の補強リブを形成したことを特徴とする請求項１記載の電磁変換器。2. The electromagnetic transducer according to claim 1, wherein a groove-shaped reinforcing rib is formed in a portion of the diaphragm surface where no coil pattern is formed . 上記振動板の立体構造を補強する補強板を設けたことを特徴とする請求項１記載の電磁変換器。  The electromagnetic transducer according to claim 1, further comprising a reinforcing plate that reinforces the three-dimensional structure of the diaphragm.
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