JP2010273241A - Condenser headphone unit - Google Patents

Condenser headphone unit Download PDF

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JP2010273241A
JP2010273241A JP2009125040A JP2009125040A JP2010273241A JP 2010273241 A JP2010273241 A JP 2010273241A JP 2009125040 A JP2009125040 A JP 2009125040A JP 2009125040 A JP2009125040 A JP 2009125040A JP 2010273241 A JP2010273241 A JP 2010273241A
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diaphragm
headphone unit
pile layer
spark discharge
condenser
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JP5227891B2 (en
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Yutaka Akino
裕 秋野
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Audio Technica KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a condenser headphone unit hardly causing spark discharge by reducing unequal electric field of a fixed pole surface and preventing spark discharge by limiting discharge current even in a condition where the spark discharge easily occurs. <P>SOLUTION: The condenser headphone unit includes a diaphragm 10 provided in tension on a support ring, and a fixed pole plate 20 disposed oppositely to the diaphragm 10 via a spacer member and having a large number of sound holes 211 for transmitting sounds. In the unit, the fixed pole plate 20 is equipped with pile layers 40 formed by electrostatically hair-transplanting short fibers 41 from the inner surface 211a of the sound holes 21 over a surface 210 opposing the diaphragm 10 so as to include at least opening end parts 211b of the sound holes 211. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、コンデンサヘッドホンユニットに関し、さらに詳しく言えば、固定極面の不平等電界を軽減して火花放電の発生を抑える技術に関するものである。   The present invention relates to a condenser headphone unit, and more particularly to a technique for reducing the occurrence of an unequal electric field on a fixed pole surface and suppressing the occurrence of spark discharge.

コンデンサヘッドホンは、振動板と固定極板とをスペーサを介して対向的に配置してなる静電型音響変換器としてのコンデンサヘッドホンユニットを備えている。コンデンサヘッドホンユニットにおいて、振動板は固定極板との間で生ずる静電引力，斥力で駆動される。固定極板に加える電圧が約１００Ｖｒｍｓ（実効値）で約１００ｄＢＳＰＬの音圧を得ることができる。   The capacitor headphone includes a capacitor headphone unit as an electrostatic acoustic transducer in which a diaphragm and a fixed electrode plate are disposed to face each other with a spacer interposed therebetween. In the condenser headphone unit, the diaphragm is driven by electrostatic attraction and repulsion generated between the diaphragm and the fixed plate. A sound pressure of about 100 dBSPL can be obtained when the voltage applied to the fixed plate is about 100 Vrms (effective value).

通常、固定極板には、多数の音孔（通気孔）が穿設された金属板が用いられるが、回路基板（銅張り積層基板）から構成される場合もある。   Usually, a metal plate having a large number of sound holes (ventilation holes) is used for the fixed electrode plate, but it may be composed of a circuit board (copper-clad laminate).

コンデンサヘッドホンユニットにおいて、音声出力レベルの安定性を保つためには、固定極板の表面を平坦にし、振動板との間隔を均一に保つことが重要であるが、大きな音圧を出す場合、固定極板に高い電圧が印加されるため、特に音孔の開口端部であるエッジ部分で火花放電が発生し、その熱によって振動板が焼損することがある。   In a condenser headphone unit, in order to maintain the sound output level stability, it is important to keep the surface of the fixed plate flat and keep the distance from the diaphragm uniform. Since a high voltage is applied to the electrode plate, a spark discharge is generated particularly at the edge portion which is the opening end portion of the sound hole, and the diaphragm may be burned by the heat.

この焼損現象は、振動板として、樹脂フィルムの片面に金属蒸着膜を形成してなる振動板が用いられる場合に、より多く発生する傾向にある。   This burnout phenomenon tends to occur more frequently when a diaphragm formed by forming a metal vapor deposition film on one side of a resin film is used as the diaphragm.

この点を考慮して、特許文献１に記載された発明では、振動板を例えばＰＥＴ（ポリエチレンテレフタレート）やＰＰＳ（ポリフェニレンサルファイド）などの厚さ約１．２μｍ程度の高分子フィルムとし、その少なくとも一方の面（固定極板と対向する側の面）に界面活性剤からなる導電皮膜を形成し、さらに導電皮膜の上に絶縁皮膜を形成するようにしている。   Considering this point, in the invention described in Patent Document 1, the diaphragm is a polymer film having a thickness of about 1.2 μm, such as PET (polyethylene terephthalate) or PPS (polyphenylene sulfide), and at least one of them is used. A conductive film made of a surfactant is formed on this surface (the surface facing the fixed electrode plate), and an insulating film is further formed on the conductive film.

これによれば、振動板側で誘発される火花放電を軽減することができるが、固定極板側の音孔の開口端部であるエッジ部分では、電界の集中により依然として火花放電が発生する。   According to this, although the spark discharge induced on the diaphragm side can be reduced, the spark discharge still occurs due to the concentration of the electric field at the edge portion which is the opening end portion of the sound hole on the fixed plate side.

固定極板の表面に絶縁皮膜を形成しても、音孔の開口端部であるエッジ部分の電界集中は防止できない。また、振動板側の絶縁皮膜は厚さ０．１μｍ程度であるため、高湿度環境下での結露する状況においては、振動板の導電皮膜と固定極との間に成極電圧（約４００Ｖ）の漏洩電流が発生し、これが原因で雑音が生じる。   Even if an insulating film is formed on the surface of the fixed electrode plate, it is not possible to prevent electric field concentration at the edge portion that is the opening end of the sound hole. In addition, since the insulating film on the diaphragm side is about 0.1 μm thick, in a situation where condensation occurs in a high humidity environment, a polarization voltage (about 400 V) is generated between the conductive film of the diaphragm and the fixed electrode. Leakage current occurs, which causes noise.

特開２００６−４１５６７公報JP 2006-41567 A

したがって、本発明の課題は、コンデンサヘッドホンユニットにおいて、固定極面の不平等電界を軽減して、火花放電を発生しにくくし、また、火花放電が発生しやすい状況下でも、放電電流を制限することによって火花放電を防止することにある。   Accordingly, an object of the present invention is to reduce an unequal electric field on a fixed pole surface in a capacitor headphone unit, to make it difficult for spark discharge to occur, and to limit discharge current even in a situation where spark discharge is likely to occur. This is to prevent spark discharge.

上記課題を解決するため、本発明は、支持リングに所定の張力をもって張設された振動板と、スペーサ部材を介して上記振動板と対向配置され、音を通すための多数の孔を有する固定極板とを備えているコンデンサヘッドホンユニットにおいて、上記固定極板には、少なくとも上記孔の開口端部を含み、上記孔の内面から上記振動板と対向する面側にかけて短繊維を静電植毛したパイル層が形成されていることを特徴としている。   In order to solve the above-described problems, the present invention provides a diaphragm having a predetermined tension on a support ring, and a fixed member having a large number of holes for allowing sound to pass through the spacer member to face the diaphragm. In the capacitor headphone unit including the electrode plate, the fixed electrode plate includes at least an opening end portion of the hole, and short fibers are electrostatically implanted from the inner surface of the hole to the surface side facing the diaphragm. A pile layer is formed.

本発明において、上記パイル層には界面活性剤が塗布されていることが好ましい。また、上記パイル層を導電性繊維で形成してもよい。いずれの場合にしても、上記パイル層に絶縁被膜が設けられるとよい。   In the present invention, it is preferable that a surfactant is applied to the pile layer. Moreover, you may form the said pile layer with an electroconductive fiber. In any case, an insulating film may be provided on the pile layer.

本発明によれば、固定極板の音孔の開口端部を覆うように、孔の内面から振動板と対向する面側にかけて、例えばナイロンやレーヨンなどの短繊維を静電植毛したパイル層を形成したことにより、音孔の開口端部に短繊維によるＲ（丸み）が付けられ、電界が集中しにくくなる。   According to the present invention, a pile layer in which short fibers such as nylon and rayon are electrostatically flocked from the inner surface of the hole to the surface facing the diaphragm so as to cover the opening end of the sound hole of the fixed electrode plate. By forming, R (roundness) due to short fibers is attached to the opening end of the sound hole, and the electric field is less likely to concentrate.

また、パイル層には適度な電気抵抗があるため、Ｒ部を含めてパイル層が固定極面として作用するとともに、火花放電が発生しやすい状況下でも、パイル層が電流制限抵抗として作用し、火花放電の発生が抑えられる。また、パイル層に絶縁皮膜を形成することにより、より効果的に火花放電の発生が抑えられる。   In addition, since the pile layer has an appropriate electrical resistance, the pile layer including the R portion acts as a fixed pole surface, and the pile layer acts as a current limiting resistor even in a situation where spark discharge is likely to occur. Generation of spark discharge is suppressed. Moreover, by forming an insulating film on the pile layer, the occurrence of spark discharge can be suppressed more effectively.

本発明の実施形態に係るコンデンサヘッドホンユニットを示す模式的な断面図。The typical sectional view showing the capacitor headphone unit concerning the embodiment of the present invention. 上記コンデンサヘッドホンユニットにおける固定極板を示す正面図。The front view which shows the fixed electrode plate in the said capacitor | condenser headphone unit. 上記コンデンサヘッドホンユニットの要部を示す拡大断面図。The expanded sectional view which shows the principal part of the said capacitor headphone unit.

次に、図１ないし図３により、本発明の実施形態について説明するが、この実施形態は本発明を限定するものではない。   Next, an embodiment of the present invention will be described with reference to FIG. 1 to FIG. 3, but this embodiment does not limit the present invention.

図１に示すように、このコンデンサヘッドホンユニット１には、振動板１０と固定極板２０とが対向的に配置されているが、振動板１０は、金属製の支持リング１１によって所定の張力をもって張設された状態で電気絶縁性のスペーサリング３０を介して固定極板２０と対向的に組み合わされる。   As shown in FIG. 1, the condenser headphone unit 1 is provided with a diaphragm 10 and a fixed electrode plate 20 facing each other. The diaphragm 10 has a predetermined tension by a metal support ring 11. In a stretched state, the fixed electrode plate 20 is opposed to the fixed electrode plate 20 through an electrically insulating spacer ring 30.

詳しくは図示しないが、振動板１０には、特許文献１に記載されているのと同じく、例えばＰＥＴ（ポリエチレンテレフタレート）やＰＰＳ（ポリフェニレンサルファイド）などの厚さ１．２μ程度の高分子フィルムに、界面活性剤からなる導電皮膜と、絶縁溶剤からなる絶縁皮膜とを積層状に形成した振動板が好ましく採用されるが、樹脂フィルムからなる薄膜基材に金属蒸着膜が形成された振動板が用いられてもよい。   Although not shown in detail, the diaphragm 10 is made of a polymer film having a thickness of about 1.2 μm such as PET (polyethylene terephthalate) or PPS (polyphenylene sulfide), as described in Patent Document 1, A diaphragm in which a conductive film made of a surfactant and an insulating film made of an insulating solvent are formed in a laminated form is preferably used, but a diaphragm in which a metal vapor deposition film is formed on a thin film substrate made of a resin film is used. May be.

この実施形態において、固定極板２０は、図２に示すように、円盤状のプリント基板２１からなる。図３を併せて参照して、プリント基板２１は片面銅張り積層基板で、振動板１０と対向する中央部分には、銅箔よりなる固定電極部２１０が形成されている。固定電極部２１０には、多数の音孔（音を通すための孔）２１１が穿設されている。   In this embodiment, the fixed electrode plate 20 is composed of a disk-shaped printed circuit board 21 as shown in FIG. Referring also to FIG. 3, the printed circuit board 21 is a single-sided copper-clad laminate, and a fixed electrode portion 210 made of copper foil is formed at the central portion facing the diaphragm 10. The fixed electrode portion 210 has a large number of sound holes (holes through which sound passes) 211.

なお、この実施形態において、固定電極部２１０の周りには、電気絶縁領域２３０を介して周辺電極部２２０が環状に形成されている。一例として、周辺電極部２２０は、図示しない導通手段を介して例えば振動板１０の支持リングに接続され、振動板１０の引出電極として用いられてよい。   In this embodiment, the peripheral electrode portion 220 is formed in an annular shape around the fixed electrode portion 210 via the electrical insulating region 230. As an example, the peripheral electrode unit 220 may be connected to, for example, a support ring of the diaphragm 10 through a conduction unit (not shown) and used as an extraction electrode of the diaphragm 10.

本発明によると、図３に示すように、固定極板２０には、音孔２１１の内面２１１ａから音孔２１１の開口端部であるほぼ直角のエッジ部分２１１ｂを含み固定電極部２１０の表面にかけてパイル層４０が形成されている。   According to the present invention, as shown in FIG. 3, the fixed electrode plate 20 includes an inner surface 211 a of the sound hole 211 and a substantially right-angled edge portion 211 b that is an opening end of the sound hole 211 and extends from the surface of the fixed electrode part 210. A pile layer 40 is formed.

パイル層４０は、図示しない導電性接着剤を介して短繊維４１を静電植毛することにより形成される。一例として、短繊維４１には、好ましくはナイロンパイル１．７デシックス（長さ０．５ｍｍ）が用いられる。   The pile layer 40 is formed by electrostatically flocking the short fibers 41 through a conductive adhesive (not shown). As an example, nylon fiber 1.7 decix (length 0.5 mm) is preferably used for the short fiber 41.

静電植毛によれば、短繊維４１は、被植毛面に対してほぼ直立した状態で植設されるため、音孔２１１のほぼ直角のエッジ部分２１１ｂには、図３に示すように、植毛された短繊維４１によりＲ（丸み）が付けられ、電界が集中しくしにくくなる。   According to electrostatic flocking, the short fibers 41 are planted in a substantially upright state with respect to the flocked surface, and therefore, the flocked flocked portion 211b of the sound hole 211 has a flocking as shown in FIG. R (roundness) is attached by the short fibers 41, and the electric field is difficult to concentrate.

加えて、静電植毛時には電界強度の高まる部分（上記エッジ部分２１１ｂ）に、その電界強度に応じてより多くの短繊維４１が付着するため、上記エッジ部分２１１ｂに電界がより集中しくしにくくなる。   In addition, since more short fibers 41 adhere to the portion where the electric field strength is increased (the edge portion 211b) during electrostatic flocking according to the electric field strength, the electric field is less likely to be concentrated on the edge portion 211b. .

静電植毛をした後、好ましくは、短繊維４１よりなるパイル層４０の電気抵抗値を調整する。例えば、コルコート社製の界面活性剤系静電防止剤「コルコート２００（商品名）」を塗布することにより、パイル層４０の表面抵抗を１０８〜１０９Ωに調整する。 After electrostatic flocking, the electrical resistance value of the pile layer 40 made of the short fibers 41 is preferably adjusted. For example, the surface resistance of the pile layer 40 is adjusted to 10 8 to 10 9 Ω by applying a surfactant-based antistatic agent “Colcoat 200 (trade name)” manufactured by Colcoat.

なお、短繊維４１として、当初から例えばニッセン社製の導電繊維「ドリーマロン」（抵抗値１０２〜１０７Ω）を用いてもよい。 In addition, as the short fiber 41, for example, a conductive fiber “Dolly Maron” (resistance value 10 2 to 10 7 Ω) manufactured by Nissen may be used from the beginning.

その後、火花放電のもとになる放電電流を流れにくくするため、パイル層４０に、例えばアイ・エヌ・ジー社製の「フロロバリアーＦＰ−１０５４（商品名）」を塗布して、好ましくは０．１μｍ厚以下の絶縁皮膜を形成する。   Thereafter, in order to make it difficult for the discharge current that causes spark discharge to flow, for example, “Fluorobarrier FP-1054 (trade name)” manufactured by ING Co., Ltd. is applied to the pile layer 40. An insulating film having a thickness of 1 μm or less is formed.

なお、上記施形態に係るコンデンサヘッドホンユニット１では、振動板１０の片側にのみ固定極板２０を配置しているが、振動板１０の両側に固定極板２０を配置したプッシュプル型のコンデンサヘッドホンユニットも本発明に含まれる。   In the capacitor headphone unit 1 according to the above embodiment, the fixed electrode plate 20 is disposed only on one side of the diaphragm 10, but the push-pull type capacitor headphone in which the fixed electrode plate 20 is disposed on both sides of the diaphragm 10. Units are also included in the present invention.

１０ 振動板
１１ 支持リング
２０ 固定極板
２１ プリント基板
２１０ 固定電極部
２１１ 音孔
２１１ａ 内面
２１１ｂ 開口端部（エッジ部分）
３０ スペーサリング
４０ パイル層
４１ 短繊維（パイル） DESCRIPTION OF SYMBOLS 10 Diaphragm 11 Support ring 20 Fixed pole plate 21 Printed circuit board 210 Fixed electrode part 211 Sound hole 211a Inner surface 211b Opening edge part (edge part)
30 Spacer ring 40 Pile layer 41 Short fiber (pile)

Claims (4)

支持リングに所定の張力をもって張設された振動板と、スペーサ部材を介して上記振動板と対向配置され、音を通すための多数の孔を有する固定極板とを備えているコンデンサヘッドホンユニットにおいて、
上記固定極板には、少なくとも上記孔の開口端部を含み、上記孔の内面から上記振動板と対向する面側にかけて短繊維を静電植毛したパイル層が形成されていることを特徴とするコンデンサヘッドホンユニット。 In a condenser headphone unit comprising: a diaphragm stretched on a support ring with a predetermined tension; and a fixed plate having a large number of holes for allowing sound to pass through the spacer member and facing the diaphragm. ,
The fixed electrode plate includes at least an opening end portion of the hole, and a pile layer in which short fibers are electrostatically implanted is formed from an inner surface of the hole to a surface facing the diaphragm. Condenser headphone unit. 上記パイル層には静電気防止用としての界面活性剤が塗布されていることを特徴とする請求項１に記載のコンデンサヘッドホンユニット。   The capacitor headphone unit according to claim 1, wherein the pile layer is coated with a surfactant for preventing static electricity. 上記パイル層が導電性繊維で形成されていることを特徴とする請求項１に記載のコンデンサヘッドホンユニット。   2. The condenser headphone unit according to claim 1, wherein the pile layer is formed of a conductive fiber. 上記パイル層には絶縁皮膜が設けられていることを特徴とする請求項１ないし３のいずれか１項に記載のコンデンサヘッドホンユニット。   The capacitor headphone unit according to any one of claims 1 to 3, wherein the pile layer is provided with an insulating film.
JP2009125040A 2009-05-25 2009-05-25 Condenser headphone unit Expired - Fee Related JP5227891B2 (en)

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JP2015531557A (en) * 2012-09-06 2015-11-02 シュアー アクイジッション ホールディングス インコーポレイテッドＳｈｕｒｅ Ａｃｑｕｉｓｉｔｉｏｎ Ｈｏｌｄｉｎｇｓ，Ｉｎｃ． Earphone with electrostatic transducer

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