JP2008154098A - Constituting member for electret condenser microphone unit, and manufacturing method thereof - Google Patents
Constituting member for electret condenser microphone unit, and manufacturing method thereof Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G7/00—Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture
- H01G7/02—Electrets, i.e. having a permanently-polarised dielectric
Abstract
Description
本発明は、エレクトレットコンデンサマイクロホンユニットに用いる構成部材およびその製造方法、より具体的には固定極組立およびその製造方法に関するものである。 The present invention relates to a component used for an electret condenser microphone unit and a manufacturing method thereof, and more specifically to a fixed pole assembly and a manufacturing method thereof.
従来のエレクトレットコンデンサマイクロホンユニットの構造を図9に示す縦断面図を用い説明する。図9において、符号1はエレクトレットコンデンサマイクロホンユニット(以下「マイクユニット」という)のケースすなわちユニットケースを示している。ユニットケース1は有底の円筒形をしており、底部に相当する部分がマイクロホンにおける音声の入力部となっていて、この底部にはマイクユニット内部に音声を導き入れるための孔1aが形成されている。ユニットケース1内には、このユニットケース1の底部に最も近い位置に振動板を保持するリング状の振動板リング2が配置され、外周縁部が上記振動板リング2の一端面に接着などによって固着されたダイヤフラム状の振動板3が配置されている。 The structure of a conventional electret condenser microphone unit will be described with reference to the longitudinal sectional view shown in FIG. In FIG. 9, reference numeral 1 denotes a case of an electret condenser microphone unit (hereinafter referred to as “microphone unit”), that is, a unit case. The unit case 1 has a bottomed cylindrical shape, and a portion corresponding to the bottom serves as a sound input portion in the microphone, and a hole 1a for introducing sound into the microphone unit is formed in the bottom portion. ing. In the unit case 1, a ring-shaped diaphragm ring 2 that holds the diaphragm is disposed at a position closest to the bottom of the unit case 1, and an outer peripheral edge portion is bonded to one end surface of the diaphragm ring 2 by bonding or the like. A fixed diaphragm-like diaphragm 3 is disposed.
固定極5は、金属製の円板を基材とし、その少なくとも一面側例えば振動板3との対向面側にエレクトレット板11が貼り付けられて、エレクトレットボードを構成している。また、固定極5は、エレクトレット板11が貼付けられる面とマイクユニット1内部側の面を連通する通気孔5aが複数設けられており、上記振動板3に対し、スペーサ4の介在のもとに対向して配置されている。スペーサ4は薄い樹脂からなるリング状の部品で、振動板3の後端面(図9において上端面)の外周縁部に密着している。従って、振動板3と固定極5の間にはスペーサ4の厚さに相当する隙間ができており、振動板3と固定極5で一種のコンデンサを構成し、上記孔1aから導き入れられる音声にしたがって振動板3が振動するのに伴い、上記コンデンサの静電容量が変化し、静電容量の変化が音声信号として出力されるようになっている。 The fixed pole 5 uses a metal disk as a base material, and an electret plate 11 is attached to at least one side thereof, for example, the side facing the diaphragm 3 to constitute an electret board. The fixed pole 5 is provided with a plurality of air holes 5a that communicate the surface on which the electret plate 11 is affixed and the surface on the inside of the microphone unit 1, and the diaphragm 3 is interposed by the spacer 4. Opposed to each other. The spacer 4 is a ring-shaped component made of a thin resin, and is in close contact with the outer peripheral edge portion of the rear end surface (upper end surface in FIG. 9) of the diaphragm 3. Therefore, a gap corresponding to the thickness of the spacer 4 is formed between the diaphragm 3 and the fixed pole 5, and the diaphragm 3 and the fixed pole 5 constitute a kind of capacitor, and the sound introduced from the hole 1a. As the diaphragm 3 vibrates, the capacitance of the capacitor changes, and the change in capacitance is output as an audio signal.
上記固定極5は、ユニットケース1内の径方向の寸法を規定する絶縁スリーブ6によって所定の位置に固定される。絶縁スリーブ6は、これを接着剤によって固定極5と接着し、この絶縁スリーブ6と上記固定極5によって形成される平面部に上記エレクトレットボード11を接着して固定極組立を構成している。 The fixed pole 5 is fixed at a predetermined position by an insulating sleeve 6 that defines the radial dimension in the unit case 1. The insulating sleeve 6 is bonded to the fixed pole 5 with an adhesive, and the electret board 11 is bonded to a flat portion formed by the insulating sleeve 6 and the fixed pole 5 to constitute a fixed pole assembly.
また図9において、絶縁スリーブ6の内周面に内接して、導電材料で構成された導電スリーブ7が配置されている。導電スリーブ7の後端面部は円板状のプリント基板8上に形成されている図示しない回路パターンに接触し、プリント基板8の後端面周縁部には、ユニットケース1の開放端縁部の折り返し部1bが当たっている。この折り返し部1bがプリント基板8を前方(図9において下方向)に向かって押圧力を生じさせて、これの圧力によって、導電スリーブ7が下方に押されて固定極5が押され、さらにスペーサ4を介して振動板保持体4がユニットケース1の底面に押し付けられ、これらの部材のユニットケース1内におけるそれぞれの位置が決められて固定されている。導電スリーブ7は、固定極5とプリント基板8を電気的に接続している。上記プリント回路基板8には、インピーダンス変換器を構成する電界効果型トランジスタ(以下「FET」という)9が配置されている。FET9の端子の一部はプリント回路基板8の所定の回路パターンに半田付け等によって接続されている。 In FIG. 9, a conductive sleeve 7 made of a conductive material is disposed in contact with the inner peripheral surface of the insulating sleeve 6. The rear end surface portion of the conductive sleeve 7 is in contact with a circuit pattern (not shown) formed on the disc-shaped printed circuit board 8, and the open end edge portion of the unit case 1 is folded back at the peripheral edge portion of the printed circuit board 8. Part 1b is hit. The folded portion 1b generates a pressing force toward the printed circuit board 8 forward (downward in FIG. 9). With this pressure, the conductive sleeve 7 is pressed downward and the fixed electrode 5 is pressed. 4, the diaphragm holder 4 is pressed against the bottom surface of the unit case 1, and the positions of these members in the unit case 1 are determined and fixed. The conductive sleeve 7 electrically connects the fixed pole 5 and the printed board 8. A field effect transistor (hereinafter referred to as “FET”) 9 constituting an impedance converter is disposed on the printed circuit board 8. A part of the terminals of the FET 9 is connected to a predetermined circuit pattern of the printed circuit board 8 by soldering or the like.
なお、上記固定極5と上記導電スリーブ7を一体成形し、金属板をプレスで打ち抜いた有底円筒形状の金属を上記固定極5として用いたものもある。この場合、導電スリーブ7を別に設ける必要はない。 In some cases, the fixed electrode 5 and the conductive sleeve 7 are integrally formed, and a bottomed cylindrical metal obtained by punching a metal plate with a press is used as the fixed electrode 5. In this case, it is not necessary to provide the conductive sleeve 7 separately.
上記の通り、ユニットケース1の折り返し部1bからの圧力によって各構成部品の位置を固定することになる。従って、各部品の接合部分が互いに平行でないと、部品の位置が定まらない。従って、各部品同士の接合面は互いに平行になるように平面にする必要がある。また、上記固定極5と振動板3によって形成されるコンデンサ部は、マイクユニットの性能を決定する最重要要素であるので、この隙間が外的環境(例えば温度変化や振動)によって変化してしまうと、マイクユニット全体の性能が劣化することになる。従って、振動板3に対して、エレクトレットボード11が安定して平行を保てるように十分に固定され、かつ、振動板3との隙間が均一であることが重要である。そのため、固定極5の位置を安定させて支持することできる固定極の支持構造に関する発明が知られている(例えば特許文献1参照)。 As described above, the position of each component is fixed by the pressure from the folded portion 1b of the unit case 1. Accordingly, the position of the component cannot be determined unless the joint portions of the components are parallel to each other. Therefore, it is necessary to make the joint surfaces of the parts flat so that they are parallel to each other. In addition, the capacitor portion formed by the fixed pole 5 and the diaphragm 3 is the most important factor that determines the performance of the microphone unit, so that this gap changes depending on the external environment (for example, temperature change or vibration). As a result, the performance of the entire microphone unit deteriorates. Therefore, it is important that the electret board 11 is sufficiently fixed to the diaphragm 3 so that the electret board 11 can be stably kept parallel, and the gap with the diaphragm 3 is uniform. For this reason, an invention related to a support structure for a fixed pole that can stably support the position of the fixed pole 5 is known (see, for example, Patent Document 1).
しかしながら、上記特許文献1記載の発明にかかる固定極の支持構造を用いても固定極5と振動板3の隙間を均一に安定させるには課題がある。固定極組立の製造工程上、振動板3に対向する固定極5の平面を均一に保つための技術的な課題があるからである。これについて、図10乃至図12を用いて説明する。図10は、従来の固定極組立の理想的な構造を示す縦断面図である。図11は従来の固定極組立において本発明によって解決される課題を有する構造を示す縦断面図である。図12は図11にて示した解決すべき課題を有する部分を拡大した拡大縦断面図である。なお、図10乃至図12に示す例では、図9に示す例と異なり、固定極が導電スリーブとともにプレス加工により一体に成形されている。 However, even if the support structure for the fixed pole according to the invention described in Patent Document 1 is used, there is a problem in uniformly stabilizing the gap between the fixed pole 5 and the diaphragm 3. This is because there is a technical problem to keep the plane of the fixed pole 5 facing the diaphragm 3 uniform in the manufacturing process of the fixed pole assembly. This will be described with reference to FIGS. FIG. 10 is a longitudinal sectional view showing an ideal structure of a conventional fixed pole assembly. FIG. 11 is a longitudinal sectional view showing a structure having a problem solved by the present invention in a conventional fixed pole assembly. FIG. 12 is an enlarged longitudinal sectional view showing an enlarged portion having the problem to be solved shown in FIG. In the example shown in FIGS. 10 to 12, unlike the example shown in FIG. 9, the fixed pole is integrally formed with the conductive sleeve by pressing.
図10において、例えば金属板をプレスで打ち抜きかつ折り曲げ成形した有底円筒形状の金属からなる固定極5と絶縁スリーブ6は、エキシポ系接着剤を用いて接着され一体に形成されている。固定極5と絶縁スリーブ6を一体形成してできる平面部(図10において底面部)にエレクトレット板11を接着する。エレクトレット板11の接着には例えばエキシポ系接着剤を用いる。このようにして構成される固定極組立13は、スペーサ4によって振動板3と隙間を形成してコンデンサを成している。上記固定極5の外径は、有効静電容量を大きくするために、振動板リング3の内径よりも小さくすることが望ましく、またスペーサ4の幅も同様である。従って、図10に示すとおりスペーサ4の幅は固定極組立13を形成する絶縁スリーブ6の幅よりも小さくなっている。上記振動板組立13は、エレクトレット板11を均一かつ平面的に接着するために、エレクトレット板11を接着する前に、当該平面部を研磨する研磨工程が必要となる。 In FIG. 10, for example, a fixed pole 5 made of a bottomed cylindrical metal obtained by punching and bending a metal plate with a press and an insulating sleeve 6 are integrally formed by using an epoxy adhesive. The electret plate 11 is bonded to a flat surface portion (bottom surface portion in FIG. 10) formed by integrally forming the fixed pole 5 and the insulating sleeve 6. For bonding the electret plate 11, for example, an excipo adhesive is used. The fixed pole assembly 13 thus configured forms a capacitor by forming a gap with the diaphragm 3 by the spacer 4. The outer diameter of the fixed pole 5 is preferably smaller than the inner diameter of the diaphragm ring 3 in order to increase the effective capacitance, and the width of the spacer 4 is also the same. Therefore, as shown in FIG. 10, the width of the spacer 4 is smaller than the width of the insulating sleeve 6 forming the fixed pole assembly 13. In order to bond the electret plate 11 uniformly and planarly, the diaphragm assembly 13 requires a polishing step for polishing the plane portion before the electret plate 11 is bonded.
図11は、上記研磨工程において生じる問題点を示している。上記絶縁スリーブ6は、ポリカネードなどの樹脂を素材とするものであるため比較的柔らかく、研磨工程によって切削されやすい。また、上記固定極5は真鍮などの金属であるので、比較的堅く、同じ研磨工程によっては絶縁スリーブ6よりは切削されにくい。従って、平面部の外周は研磨工程によって切削されやすく、逆に平面部の中心部は切削されにくい構成である。そうすると、上記研磨工程により、絶縁スリーブ6の外周部分だけが他の部分よりも多く研磨されて削られてしまう。仮に、研磨対象が金属であったとしても、外周縁部が余分に研磨されてしまい、いわゆる「ダレ」が生じる。図11のC部分は上記「ダレ」の部分を示しており、このように絶縁スリーブ6の外周縁部に「ダレ」が生じると、固定極組立13全体としては、振動板3に対向する面、すなわちエレクトレット板11を接着する面が振動板3方向にふくらんだ形状となってしまう。このように上記平面部が振動板3側に膨らんだ形状になると、エレクトレット板11は、この形状にそって接着されるのでスペーサ4と面接触にはならず、スペーサ4とエレクトレット板11の間にも隙間が生じる。図12は上記C部分の拡大図で、図12に示すように、絶縁スリーブ6と固定極5で形成する平面部の外周縁部が略円錐面になってしまう。そうすると、この円錐面に合わせてエレクトレット板11が接着されるので、スペーサ4がエレクトレット板11と面接触できなくなり、スペーサ4との接触によってエレクトレット板が固定される効果が低くなる。そうするとエレクトレット板11の縁は剥がれやすくなり、ますます平面度が崩れて、振動板3との隙間にもバラツキが生じ、これによって有効容量にバラツキが生じてマイクユニットの性能のバラツキの原因となる。また、スペーサ4が上記円錐面に落ち込むため、振動板と固定極5との間に、スペーサ4の厚さに見合った目論見どおりの隙間を確保できなくなるという難点もある。 FIG. 11 shows a problem that occurs in the polishing step. Since the insulating sleeve 6 is made of a resin such as polycarbonate, it is relatively soft and easily cut by a polishing process. Further, since the fixed electrode 5 is made of metal such as brass, it is relatively hard and is less likely to be cut than the insulating sleeve 6 by the same polishing process. Therefore, the outer periphery of the flat portion is easily cut by the polishing process, and conversely, the central portion of the flat portion is difficult to cut. If it does so, only the outer peripheral part of the insulating sleeve 6 will be grind | polished and shaved more than the other part by the said grinding | polishing process. Even if the object to be polished is a metal, the outer peripheral edge is excessively polished, and so-called “sagging” occurs. A portion C in FIG. 11 indicates the “sag” portion. When the “sag” is generated at the outer peripheral edge of the insulating sleeve 6 as described above, the fixed pole assembly 13 as a whole faces the diaphragm 3. That is, the surface to which the electret plate 11 is bonded becomes a shape that swells in the direction of the diaphragm 3. When the flat portion is thus swelled to the vibration plate 3 side, the electret plate 11 is bonded along this shape, so that it does not come into surface contact with the spacer 4 and between the spacer 4 and the electret plate 11. There is also a gap. FIG. 12 is an enlarged view of the portion C. As shown in FIG. 12, the outer peripheral edge portion of the flat portion formed by the insulating sleeve 6 and the fixed pole 5 becomes a substantially conical surface. If it does so, since the electret board 11 will be adhere | attached according to this conical surface, the spacer 4 will be unable to surface-contact with the electret board 11, and the effect that an electret board will be fixed by contact with the spacer 4 will become low. If it does so, the edge of the electret board 11 will be easy to peel off, flatness will collapse | crumble more and more, and the clearance gap with the diaphragm 3 will also arise, and this will produce a variation in an effective capacity | capacitance and will cause the dispersion | variation in the performance of a microphone unit. . In addition, since the spacer 4 falls on the conical surface, there is a difficulty in that it is impossible to secure a gap as expected according to the thickness of the spacer 4 between the diaphragm and the fixed pole 5.
本発明は、上記従来の固定極組立の製造方法に生じる問題点を鑑みてなされたもので、固定極組立の組立工程において、固定極組立の外周部が削られても、エレクトレット板が剥離することを防止することができるエレクトレットコンデンサマイクロホンの構成部材およびその製造方法を提供することを目的とする。 The present invention has been made in view of the problems that occur in the above-described conventional method of manufacturing a fixed pole assembly. In the assembly process of the fixed pole assembly, the electret plate is peeled even if the outer periphery of the fixed pole assembly is scraped. An object of the present invention is to provide a constituent member of an electret condenser microphone and a method for manufacturing the same.
本発明は、振動板と、この振動板が固着された振動板保持体と、上記振動板に隙間をおいて対向配置され上記振動板との間でコンデンサを構成するエレクトレットを用いた固定極を含む構成部材を有するエレクトレットコンデンサマイクロホンユニットに用いる前記構成部材の製造方法であって、
ガラス板平面にエレクトレットシートを設置する第一の工程と、上記固定極のエレクトレット貼付け面を平面に研磨する第二の工程と、上記ガラス平面上に設置したエレクトレットシートに紫外線硬化樹脂を塗布する第三の工程と、上記固定極の平面を上記エレクトレットシート上に置き、上記ガラス面側から紫外線を上記平面に照射する第四の工程と、上記固定極を上記ガラス面から剥がしたのち、固定極の外周に沿ってエレクトレットシートを切除する第五の工程と、を備えることを主な特徴とする。
The present invention includes a diaphragm, a diaphragm holder to which the diaphragm is fixed, and a fixed pole using an electret that is disposed so as to face the diaphragm with a gap therebetween and constitutes a capacitor. A method of manufacturing the constituent member used for an electret condenser microphone unit having a constituent member including:
A first step of installing an electret sheet on the glass plate plane, a second step of polishing the electret pasting surface of the fixed electrode into a plane, and a step of applying an ultraviolet curable resin to the electret sheet installed on the glass plane A third step, a fourth step of placing the plane of the fixed electrode on the electret sheet, and irradiating the plane with ultraviolet rays from the glass surface side; and peeling off the fixed electrode from the glass surface; And a fifth step of cutting the electret sheet along the outer periphery of the main feature.
本発明によれば、エレクトレット板の接着に紫外線硬化樹脂を用い、この紫外線硬化樹脂をエレクトレットシートと固定極の平面の間に介在させることで、研磨工程によって切削された部分が紫外線硬化樹脂で埋められて固定極を平面化することができるので、エレクトレット板と振動板との間隙のバラツキを防止することができるエレクトレットコンデンサマイクロホンユニット用構成部材を得ることができる。 According to the present invention, an ultraviolet curable resin is used for bonding the electret plate, and this ultraviolet curable resin is interposed between the electret sheet and the plane of the fixed electrode, so that the portion cut by the polishing process is filled with the ultraviolet curable resin. Therefore, since the fixed pole can be planarized, it is possible to obtain an electret condenser microphone unit constituent member that can prevent variation in the gap between the electret plate and the diaphragm.
以下、本発明にかかるエレクトレットコンデンサマイクロホンユニット用構成部材およびその製造方法の実施例について、図を用いて説明する。先ず、図1に示すように、帯電させたエレクトレットフィルム110をガラス板10の上におく。エレクトレットフィルム110は静電気によってガラス板10に貼り付くので、表面(図1において上面)は平坦になる。エレクトレットフィルム110は例えばテフロン(登録商標)を用いて、表面(図1において上)側に活性化処理を施しておくことによって後工程における接着が容易になるようにする。 Embodiments of a constituent member for an electret condenser microphone unit and a method for manufacturing the same according to the present invention will be described below with reference to the drawings. First, as shown in FIG. 1, a charged electret film 110 is placed on a glass plate 10. Since the electret film 110 adheres to the glass plate 10 by static electricity, the surface (upper surface in FIG. 1) becomes flat. For example, Teflon (registered trademark) is used for the electret film 110 so that the surface (upper side in FIG. 1) is subjected to an activation process so that adhesion in a subsequent process is facilitated.
次に、事前に接着等によって一体に形成した固定極5と絶縁スリーブ6の平面部を研磨し、この研磨面に紫外線硬化樹脂を塗布する(図2)。その後に、上記固定極5と絶縁スリーブ6の平面部を、活性化処理を施した上記エレクトレットフィルム110の表面に乗せる。そうすると紫外線硬化樹脂12は、上記平面部にそってエレクトレットフィルム110上に広がり、接着面を形成する。それと同時に、紫外線硬化樹脂12の一部が絶縁スリーブ6の外周部分にはみ出し、上記固定極5と絶縁スリーブ6の平面部の外周縁部に研磨によって生じた前記「ダレ」の部分が紫外線硬化樹脂で埋められる(図3参照)。この状態でガラス面の反対側(図3において下方向)から、紫外線を照射する。紫外線はガラス板10を透過して上記接着面に照射されるので、これによって紫外線硬化樹脂12は硬化し、エレクトレットシート110を接着する(図3)。また、紫外線を照射する前にガラス板10側から接着面を視認して、気泡が接着面に存在すれば一度、合成物を剥がして気泡を除去してから紫外線を照射するようにしてもよい。 Next, the flat portions of the fixed pole 5 and the insulating sleeve 6 that are integrally formed in advance by bonding or the like are polished, and an ultraviolet curable resin is applied to the polished surface (FIG. 2). Thereafter, the flat portions of the fixed pole 5 and the insulating sleeve 6 are placed on the surface of the electret film 110 that has been activated. Then, the ultraviolet curable resin 12 spreads on the electret film 110 along the flat portion and forms an adhesive surface. At the same time, a part of the ultraviolet curable resin 12 protrudes from the outer peripheral portion of the insulating sleeve 6, and the “sag” portion generated by polishing at the outer peripheral edge of the flat portion of the fixed electrode 5 and the insulating sleeve 6 is the ultraviolet curable resin. (See FIG. 3). In this state, ultraviolet rays are irradiated from the opposite side of the glass surface (downward in FIG. 3). Since the ultraviolet rays are transmitted through the glass plate 10 and irradiated onto the bonding surface, the ultraviolet curable resin 12 is cured thereby, and the electret sheet 110 is bonded (FIG. 3). Further, the adhesive surface is visually recognized from the glass plate 10 side before irradiation with ultraviolet rays, and once the bubbles are present on the adhesive surface, the composite may be peeled off once to remove the bubbles and then irradiated with ultraviolet rays. .
上記の工程によって、紫外線硬化樹脂12が硬化した後に、エレクトレットシート110をガラス板10から取り外す。エレクトレットシート110は、静電気によってガラス板10に接着しているので、容易に取りはずすことができる(図4a)。このようにして得ることが出来る構成部材は、図4(b)に示すように、研磨工程で削れて曲面になった絶縁スリーブ6の切削部分に紫外線硬化樹脂12が入り込んだ状態で硬化されるため、エレクトレットシート110の接着面はガラス板10の面に倣って平面に保つことができる。 After the ultraviolet curable resin 12 is cured by the above process, the electret sheet 110 is removed from the glass plate 10. Since the electret sheet 110 is adhered to the glass plate 10 by static electricity, it can be easily removed (FIG. 4a). As shown in FIG. 4B, the component member that can be obtained in this way is cured in a state in which the ultraviolet curable resin 12 enters the cut portion of the insulating sleeve 6 that has been curved by the polishing process to form a curved surface. Therefore, the adhesive surface of the electret sheet 110 can be kept flat following the surface of the glass plate 10.
次に、絶縁スリーブ6の外周面よりはみ出たエレクトレットシート110と紫外線硬化樹脂12を、絶縁スリーブ6の外周面に沿って切除して、固定極5の通気孔5aを塞いでいるエレクトレットシート110をプレスで開口することで、本発明に係る固定極組立13を得ることができる(図5参照)。なお、固定極5にエレクトレットシート110を接着した後に、プレス加工により固定極5の通気孔5aとエレクトレットシート110の開口を同時に形成してもよい。 Next, the electret sheet 110 and the ultraviolet curable resin 12 protruding from the outer peripheral surface of the insulating sleeve 6 are cut along the outer peripheral surface of the insulating sleeve 6, and the electret sheet 110 blocking the vent hole 5 a of the fixed electrode 5 is removed. The fixed pole assembly 13 according to the present invention can be obtained by opening with a press (see FIG. 5). Note that, after the electret sheet 110 is bonded to the fixed electrode 5, the air holes 5 a of the fixed electrode 5 and the opening of the electret sheet 110 may be formed simultaneously by pressing.
このようにして得た固定極組立13を、振動板リング2に固定された振動板3にスペーサ4を介して対向させる(図6、図7)。固定極組立13を構成する絶縁スリーブ6の縁が削れて円錐面になったとしても、この円錐面は紫外線硬化樹脂12で埋められるため、振動板3との平行度を保った固定極組立13を得ることが出来る(図8)。これによって、固定極5と振動板3との間に介在するスペーサ4が振動板3と平行な平面に介在することになるため、固定極5と振動板3との間隔を、目論見どおりスペーサ4の厚さ寸法に見合った間隔に設定することができる。 The fixed pole assembly 13 obtained in this way is opposed to the diaphragm 3 fixed to the diaphragm ring 2 via the spacer 4 (FIGS. 6 and 7). Even if the edge of the insulating sleeve 6 constituting the fixed pole assembly 13 is scraped into a conical surface, the conical surface is filled with the ultraviolet curable resin 12, so that the fixed pole assembly 13 that maintains parallelism with the diaphragm 3 is maintained. Can be obtained (FIG. 8). As a result, the spacer 4 interposed between the fixed pole 5 and the diaphragm 3 is interposed in a plane parallel to the diaphragm 3, so that the distance between the fixed pole 5 and the diaphragm 3 is set as the spacer 4 as intended. It is possible to set the interval corresponding to the thickness dimension.
以上説明した実施例に係るエレクトレットコンデンサマイクロホンユニットの構成部材を組み込むことによってエレクトレットコンデンサマクロホンユニットを得ることができ、このエレクトレットコンデンサマイクロホンユニットをマイクロホンケースに組み込むことにより、エレクトレットコンデンサマイクロホンを構成することができる。 An electret condenser microphone unit can be obtained by incorporating the constituent members of the electret condenser microphone unit according to the embodiment described above, and an electret condenser microphone can be constructed by incorporating this electret condenser microphone unit into a microphone case. it can.
1 マイクユニット
2 振動板リング
3 振動板
4 スペーサ
5 固定極
6 絶縁スリーブ
10 ガラス板
11 エレクトレット板
12 紫外線硬化剤
13 固定極組立
110 エレクトレットシート
DESCRIPTION OF SYMBOLS 1 Microphone unit 2 Diaphragm ring 3 Diaphragm 4 Spacer 5 Fixed pole 6 Insulation sleeve 10 Glass plate 11 Electret board 12 Ultraviolet curing agent 13 Fixed pole assembly 110 Electret sheet
Claims (2)
ガラス板平面にエレクトレットシートを設置する第一の工程と、
上記固定極のエレクトレット貼付け面を平面に研磨する第二の工程と、
上記ガラス平面上に設置したエレクトレットシートに紫外線硬化樹脂を塗布する第三の工程と、
上記固定極の平面を上記エレクトレットシート上に置き、上記ガラス面側から紫外線を上記平面に照射する第四の工程と、
上記固定極を上記ガラス面から剥がしたのち、固定極の外周に沿ってエレクトレットシートを切除する第五の工程と、を備えることを特徴とするエレクトレットコンデンサマイクロホンユニットに用いる構成部材の製造方法。 A structural member including a diaphragm, a diaphragm holder to which the diaphragm is fixed, and a fixed pole using an electret that is disposed to face the diaphragm with a gap therebetween and constitutes a capacitor between the diaphragm and the diaphragm. A method of manufacturing the component used for an electret condenser microphone unit having:
A first step of installing an electret sheet on the glass plate plane;
A second step of polishing the electret pasting surface of the fixed electrode into a flat surface;
A third step of applying an ultraviolet curable resin to the electret sheet installed on the glass plane;
A fourth step of placing the plane of the fixed pole on the electret sheet and irradiating the plane with ultraviolet rays from the glass surface side;
And a fifth step of cutting the electret sheet along the outer periphery of the fixed pole after peeling the fixed pole from the glass surface. A method for producing a component member for use in an electret condenser microphone unit.
上記固定極の外周に接着する絶縁スリーブと、上記固定極によってエレクトレットシートを接着する平面部を構成し、
上記絶縁スリーブの縁が削れて平面を保てない部分が紫外線硬化樹脂によって埋められエレクトレットシートの接着面が平面であることを特徴とするエレクトレットコンデンサマイクロホンユニット用構成部材。 An electret condenser microphone including a diaphragm, a diaphragm holder to which the diaphragm is fixed, and a fixed pole using an electret that is disposed to face the diaphragm with a gap therebetween and forms a capacitor with the diaphragm A component for the unit,
An insulating sleeve that adheres to the outer periphery of the fixed electrode, and a flat part that adheres the electret sheet by the fixed electrode,
A component for an electret condenser microphone unit, characterized in that a portion where the edge of the insulating sleeve is shaved and a flat surface cannot be maintained is filled with an ultraviolet curable resin, and an adhesive surface of the electret sheet is flat.
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JP2012039489A (en) * | 2010-08-10 | 2012-02-23 | Audio Technica Corp | Capacitor microphone unit and method for producing the same |
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