JP5130560B2 - Fixed pole assembly and manufacturing method thereof - Google Patents
Fixed pole assembly and manufacturing method thereof Download PDFInfo
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- JP5130560B2 JP5130560B2 JP2006341718A JP2006341718A JP5130560B2 JP 5130560 B2 JP5130560 B2 JP 5130560B2 JP 2006341718 A JP2006341718 A JP 2006341718A JP 2006341718 A JP2006341718 A JP 2006341718A JP 5130560 B2 JP5130560 B2 JP 5130560B2
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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
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 disk-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 pole 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 press working.
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 insulation sleeve 6 will be grind | polished and shaved more than another 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. Thus, when the above-mentioned flat portion is in a shape swelled to the diaphragm 3 side, the electret plate 11 is bonded along this shape, so that it does not come into surface contact with the spacer 4 but 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 cannot surface-contact with the electret board 11, and the effect that an electret board is 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, flatness will collapse | crumble more and more, and the gap with the diaphragm 3 will also generate | occur | produce, and this will produce a variation in an effective capacity | capacitance and cause the performance variation 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、外周に絶縁部材が嵌合された固定極の平面部にエレクトレットが設置され、上記エレクトレットが振動板と隙間をおいて対向配置されてコンデンサを形成する固定極組立の製造方法であって、静電気によりガラス板の平坦面にエレクトレットシートを貼り付けて設置する第一の工程と、上記固定極の平面部を研磨する第二の工程と、上記研磨された平面部に紫外線硬化樹脂を塗布する第三の工程と、上記紫外線硬化樹脂が塗布された上記平面部を上記エレクトレットシート上に置き、上記平面部に紫外線を照射する第四の工程と、上記紫外線硬化樹脂が硬化した後、上記固定極を上記エレクトレットシートとともに上記ガラス板から剥がし、上記エレクトレットシートを上記絶縁部材の外周縁に沿って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 is a method of manufacturing a fixed pole assembly in which an electret is installed on a flat portion of a fixed pole having an insulating member fitted on the outer periphery, and the electret is disposed opposite to a diaphragm to form a capacitor. A first step of attaching an electret sheet to the flat surface of the glass plate by static electricity, a second step of polishing the flat portion of the fixed electrode, and an ultraviolet curable resin on the polished flat portion. After applying the third step of applying, the flat portion coated with the ultraviolet curable resin on the electret sheet, irradiating the flat portion with ultraviolet rays, and after the ultraviolet curable resin is cured, It peeled the fixed pole from the glass plate with the electret sheet, Preparations and fifth step of ablating, the said electret sheet along the outer periphery of the insulating member The main features of the Rukoto.
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 on 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 obtained in this way is cured in a state where the ultraviolet curable resin 12 has entered the cut portion of the insulating sleeve 6 that has been cut into a curved surface by the polishing process. 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 out 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)
静電気によりガラス板の平坦面にエレクトレットシートを貼り付けて設置する第一の工程と、
上記固定極の平面部を研磨する第二の工程と、
上記研磨された平面部に紫外線硬化樹脂を塗布する第三の工程と、
上記紫外線硬化樹脂が塗布された上記平面部を上記エレクトレットシート上に置き、上記平面部に紫外線を照射する第四の工程と、
上記紫外線硬化樹脂が硬化した後、上記固定極を上記エレクトレットシートとともに上記ガラス板から剥がし、上記エレクトレットシートを上記絶縁部材の外周縁に沿って切除する第五の工程と、
を備えることを特徴とする固定極組立の製造方法。 A method of manufacturing a fixed pole assembly in which an electret is installed on a flat portion of a fixed pole with an insulating member fitted on the outer periphery, and the electret is disposed opposite to the diaphragm with a gap therebetween to form a capacitor,
A first step of installing an electret sheet on a flat surface of a glass plate by static electricity; and
A second step of polishing the flat portion of the fixed pole;
A third step of applying an ultraviolet curable resin to the polished flat portion;
A fourth step of placing the planar portion coated with the ultraviolet curable resin on the electret sheet and irradiating the planar portion with ultraviolet rays;
After the ultraviolet curable resin is cured, a fifth step of peeling the fixed electrode from the glass plate together with the electret sheet, and cutting the electret sheet along the outer peripheral edge of the insulating member;
A method of manufacturing a fixed pole assembly, comprising:
上記エレクトレットは、紫外線硬化樹脂によって一体に形成された上記固定極と上記絶縁部材の平面部に固定されており、
上記一体に形成された上記固定極と上記絶縁部材の平面部の外周縁部に生じている切削部分が上記紫外線硬化樹脂によって埋められていることを特徴とする固定極組立。 A fixed pole assembly in which an electret is installed on a flat surface portion of a fixed pole formed by fitting an insulating member on the outer periphery, and the electret is disposed to face the diaphragm with a gap therebetween, thereby forming a capacitor.
The electret is fixed to the fixed pole formed integrally with an ultraviolet curable resin and the flat portion of the insulating member ,
The fixed pole assembly characterized in that the integrally formed fixed pole and a cutting portion generated at the outer peripheral edge of the flat portion of the insulating member are filled with the ultraviolet curable resin.
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| JP5570014B2 (en) * | 2010-08-10 | 2014-08-13 | 株式会社オーディオテクニカ | Condenser microphone unit and manufacturing method thereof |
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| JPS606600B2 (en) * | 1979-10-05 | 1985-02-19 | 松下電器産業株式会社 | Manufacturing method of acoustic diaphragm unit |
| JPS5744399A (en) * | 1980-08-29 | 1982-03-12 | Sony Corp | Electrostatic type electroacoustic transducer |
| JPS5744400A (en) * | 1980-08-29 | 1982-03-12 | Sony Corp | Electrostatic type electroacoustic transducer |
| JPS5945799A (en) * | 1982-09-09 | 1984-03-14 | Toshiba Corp | Manufacture of diaphragm for microphone |
| JPH07227000A (en) * | 1994-02-15 | 1995-08-22 | Audio Technica Corp | Static electroacoustic transducer |
| JP2005057645A (en) * | 2003-08-07 | 2005-03-03 | Matsushita Electric Ind Co Ltd | Electret capacitor microphone |
| JP2006109264A (en) * | 2004-10-07 | 2006-04-20 | Hosiden Corp | Electret condenser microphone |
| JP4601436B2 (en) * | 2005-01-24 | 2010-12-22 | 株式会社オーディオテクニカ | Electrostatic electroacoustic transducer, condenser microphone using the same, and manufacturing method of electrostatic electroacoustic transducer |
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