JPH0568200U - Condenser microphone - Google Patents
Condenser microphoneInfo
- Publication number
- JPH0568200U JPH0568200U JP8708490U JP8708490U JPH0568200U JP H0568200 U JPH0568200 U JP H0568200U JP 8708490 U JP8708490 U JP 8708490U JP 8708490 U JP8708490 U JP 8708490U JP H0568200 U JPH0568200 U JP H0568200U
- Authority
- JP
- Japan
- Prior art keywords
- condenser microphone
- vibrating membrane
- fixed electrode
- frequency
- khz
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
(57)【要約】 電子出願以前の出願であるので 要約・選択図及び出願人の識別番号は存在しない。(57) [Summary] Because it is an application before electronic filing There is no abstract / selection drawing and applicant identification number.
Description
【考案の詳細な説明】 (1) 考案の属する産業上の利用分野 本考案はコンデンサマイクロホンの構造に関す るものである。[Detailed Description of the Invention] (1) Industrial field to which the invention belongs The present invention relates to the structure of a condenser microphone.
(2) 従来の技術 従来のコンデンサマイクロホンの構造は第１図 に示すとおりであり、１はエレクトレット化せさ れた振動膜、２は振動膜１の一面に貼付した金属 のリング、３は薄型のスペースリング、４は数個 の穴4aを設けた固定電極として用いられる金属 の背極板、５は筒体の形状をした絶縁物の内ケー ス、６はインピーダンス変換器、７は回路基板、 7aは導電パターン、８は上記部品をこれ固定する金 属ケース、９は数個の穴9aを設けた形状を有し コンデンサマイクロホンを取付け支持する筐体で ある。(2) Conventional technology The structure of a conventional condenser microphone is as shown in Fig. 1, where 1 is a vibrating membrane that has been electretized, 2 is a metal ring attached to one surface of the vibrating membrane, and 3 is thin. Space ring, 4 is a metal back electrode plate used as a fixed electrode having several holes 4a, 5 is an inner case of a cylindrical insulator, 6 is an impedance converter, and 7 is a circuit board. Reference numeral 7a is a conductive pattern, 8 is a metal case for fixing the above components, and 9 is a case having a shape having several holes 9a for mounting and supporting a condenser microphone.
従来のコンデンサマイクロホンはオーディオ用 として、周波数帯域は15kHz以上まで伸びており、 平坦な周波数特性を有するように構成されている。 The conventional condenser microphone for audio use has a frequency band extending to 15 kHz or more and is configured to have a flat frequency characteristic.
そのため背極板４に設けられた穴4aは周波数特 性を平坦にするための音響抵抗として用いられ、 振動膜１に均等の音響抵抗を働かすために背極板 ４の一定の円周上に等間隔に並べられていた。Therefore, the hole 4a provided in the back electrode plate 4 is used as an acoustic resistance for flattening the frequency characteristic, and in order to exert an even acoustic resistance on the vibrating membrane 1, the hole 4a is formed on a constant circumference of the back electrode plate 4. They were evenly spaced.
しかし、例えば電話機のように伝送周波数帯域 が0.3〜3.4kHzもしくは0.1〜７kHzと制限され るような場合には、送話系の明瞭性を良くするた めに、マイクロホンの周波数特性は１〜２kHz以 上の高域の感度が１〜２kHz以下の低域の感度よ り５dB程度高くなるようにする必要があるが、背 極板４に設けられた穴4aを円周上に等間隔に並 べても、第２図の実線に示すように一部の周波数 の感度のみが上昇してしまい目的の周波数特性が 得られないという欠点があった。 However, in the case where the transmission frequency band is limited to 0.3 to 3.4 kHz or 0.1 to 7 kHz as in a telephone, for example, the microphone frequency characteristic is 1 to 2 kHz in order to improve the clarity of the transmission system. It is necessary to make the above high frequency sensitivity about 5 dB higher than the low frequency sensitivity of 1 to 2 kHz or less, but the holes 4a provided in the back electrode plate 4 are arranged at equal intervals on the circumference. In all cases, as shown by the solid line in FIG. 2, there is a drawback that the sensitivity of only a part of frequencies is increased and the desired frequency characteristics cannot be obtained.
(3) 考案の目的 本考案は、これらの欠点を解決するため、背極 板に設けられた穴の位置を変更することにより周 波数特性を改善したコンデンサマイクロホンを提 供するものである。(3) Purpose of the Invention In order to solve these drawbacks, the present invention provides a condenser microphone whose frequency characteristics are improved by changing the positions of the holes provided in the back plate.
(4) 考案の構成および作用 この目的を達成するために、本考案のコンデン サマイクロホンは、振動膜上の電極と、該振動膜 とスペーサを介して配置された固定電極を有し、 該振動膜上の電極と該固定電極間の空隙がコンデ ンサとなるように構成されたコンデンサマイクロ ホンにおいて、前記固定電極上に設けた周波数特 性調整用の穴が、該固定電極の中心を基準に120° 以上230°以内の扇形の範囲内に配置されたこと を特徴とする構成を有している。(4) Configuration and operation of the device In order to achieve this object, the condenser microphone of the present invention has an electrode on the vibrating membrane and a fixed electrode arranged via the vibrating membrane and a spacer. In a condenser microphone configured such that the gap between the electrode on the membrane and the fixed electrode serves as a capacitor, the frequency characteristic adjusting hole provided on the fixed electrode is based on the center of the fixed electrode. It has a configuration characterized in that it is arranged within a fan-shaped range of 120 ° or more and 230 ° or less.
以下本考案を詳細に説明する。 The present invention will be described in detail below.
第２図は背極板４に設けられた穴４ａの位置に よりコンデンサマイクロホンの感度周波数特性が 変化することを示したものであり、背極板４に円 形の穴５個を円周上に等間隔に並べた従来の周波 数特性よりも、230°の範囲内で円周上に並べ た場合の周波数特性の方が１kHz以上の感度が 平坦に近くなり、190°の範囲内で円周上に並べ た場合の周波数特性の方がさらに１kHz以上の 感度を平坦に近くすることができる。また160° の範囲内で円周上に並べた場合の周波数特性は ２kHz以下の感度よりも２kHz以上の感度を一様 に５dB程度高くすることができる。 Fig. 2 shows that the sensitivity frequency characteristic of the condenser microphone changes depending on the position of the hole 4a formed in the back electrode plate 4. Five circular holes are formed in the back electrode plate 4 on the circumference. Compared with the conventional frequency characteristics arranged at equal intervals, the frequency characteristics when arranged on the circumference within a range of 230 ° have a sensitivity of 1 kHz or more that is more flat, and the frequency characteristics within a range of 190 ° With the frequency characteristics when arranged on the circumference, the sensitivity above 1 kHz can be made more flat. In addition, the frequency characteristics when arranged on the circumference within the range of 160 ° can uniformly increase the sensitivity of 2 kHz or more by about 5 dB over the sensitivity of 2 kHz or less.
このように背極板４に設けられた穴の位置を変 えることにより周波数特性を改善することができ、 特性の周波数を境に感度の高さも調整することが できる。 By changing the positions of the holes formed in the back electrode plate 4 in this way, the frequency characteristic can be improved, and the sensitivity can be adjusted with the characteristic frequency as a boundary.
なお第２図では背極板に設けた穴を円形とした が、穴の形状は三角，四角，多角形，楕円等でも よく、また穴の位置も円周上でなくともよく、穴 の数の５個でなく１〜複数個でも同様の効果が得 られる。 Although the holes formed in the back electrode plate are circular in Fig. 2, the holes may be triangular, square, polygonal, elliptical, etc., and the positions of the holes need not be on the circumference. The same effect can be obtained with one to a plurality of pieces instead of five pieces.
(5) 本考案の効果 以上説明したように、本考案により背極板に設 けた穴の位置を変えることにより、コンデンサマ イクロホンの周波数特性を目的の電話機用周波数 特性に調整することができる。(5) Effects of the present invention As described above, the frequency characteristics of the condenser microphone can be adjusted to the intended telephone frequency characteristics by changing the positions of the holes provided in the back plate according to the present invention.
第１図は従来のコンデンサマイクロホンの断面 図、第２図は従来例と本考案の一実施例の周波数 特性図である。 １…エレクトレット化された振動膜、 ２…振動膜１の一面に貼付した金属リング、 ３…薄型のスペースリング、 ４…数個の穴4aを設けた固定電極として用い られる金属の背極板、 ５…筒体の形状をし た絶縁物の内ケース、 ６…インピーダンス変 換器、 ７…回路基板、 ８…上記部品を固定 する金属ケース、 ９…コンデンサマイクロホ ンを取付け支持する筐体。 FIG. 1 is a sectional view of a conventional condenser microphone, and FIG. 2 is a frequency characteristic diagram of a conventional example and an embodiment of the present invention. 1 ... Electretized vibrating membrane, 2 ... Metal ring attached to one surface of vibrating membrane 1, 3 ... Thin space ring, 4 ... Metal back electrode plate used as a fixed electrode having several holes 4a, 5 ... Inner case of insulator in the shape of cylindrical body, 6 ... Impedance converter, 7 ... Circuit board, 8 ... Metal case for fixing the above parts, 9 ... Housing for mounting and supporting capacitor microphone.
【手続補正書】[Procedure amendment]
【提出日】平４．１２．９ 図面の簡単な説明を次のように補正する。 第５頁下から第６行〔特性図〕の次に〔、第３図は本
考案に用いる背極板の具体例を示す図〕を挿入する。[Submission date] Flat 4.12.9 Amend the simple explanation of the drawings as follows. From the bottom of page 5 to the sixth line (characteristic diagram), insert [[FIG. 3] is a diagram showing a specific example of the back electrode plate used in the present invention].
Claims (1)
を介し て配置された固定電極を有し、該振動膜上の電極 と該固定電極間の空隙がコンデンサとなるように 構成されたコンデンサマイクロホンにおいて、前 記固定電極上に設けた周波数特性調整用の穴が、 該固定電極の中心を基準に120°以上230°以内 の扇形の範囲内に配置されたことを特徴とするコ ンデンサマイクロホン。1. An electrode on a vibrating membrane, and a fixed electrode arranged via the vibrating membrane and a spacer, wherein the gap between the electrode on the vibrating membrane and the fixed electrode is a capacitor. In the condenser microphone, the hole for adjusting the frequency characteristic provided on the fixed electrode is arranged within a fan-shaped range of 120 ° to 230 ° with respect to the center of the fixed electrode. Ndensa microphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8708490U JPH0568200U (en) | 1990-08-21 | 1990-08-21 | Condenser microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8708490U JPH0568200U (en) | 1990-08-21 | 1990-08-21 | Condenser microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0568200U true JPH0568200U (en) | 1993-09-10 |
Family
ID=13905081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8708490U Pending JPH0568200U (en) | 1990-08-21 | 1990-08-21 | Condenser microphone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0568200U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS627300A (en) * | 1985-07-03 | 1987-01-14 | Matsushita Electric Ind Co Ltd | Electret capacitor microphone |
-
1990
- 1990-08-21 JP JP8708490U patent/JPH0568200U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS627300A (en) * | 1985-07-03 | 1987-01-14 | Matsushita Electric Ind Co Ltd | Electret capacitor microphone |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR940003856B1 (en) | Second order toroidal microphone | |
| US2975243A (en) | Transducers | |
| US4558249A (en) | Stretched piezopolymer transducer with unsupported areas | |
| KR930007303A (en) | Electret Condenser Microphone Unit | |
| US4619342A (en) | Multiple sound transducer system utilizing an acoustic filter to reduce distortion | |
| US4701640A (en) | Electret transducer and method of fabrication | |
| US4885773A (en) | Apparatus for mounting a unidirectional microphone in a hands-free telephone subset | |
| US3206558A (en) | Microphone | |
| JPH0568200U (en) | Condenser microphone | |
| US3814864A (en) | Condenser microphone having a plurality of discrete vibratory surfaces | |
| KR870001507B1 (en) | Condencer microphone | |
| JP3467909B2 (en) | Acoustic lens device | |
| GB2157916A (en) | An electric transducer and a method for manufacturing a transducer assembly | |
| USRE17448E (en) | of berlin-grttnewald | |
| US1738853A (en) | Diaphragm for transmitters and receivers | |
| KR930003063B1 (en) | Condenser microphone cartridge | |
| JP2607576Y2 (en) | Sound pressure gradient microphone | |
| KR200235779Y1 (en) | An condenser microphone of directional | |
| JP2003018696A (en) | Electret capacitor microphone | |
| JPH0230959Y2 (en) | ||
| US1631350A (en) | Telephone and cap therefor | |
| JPH0134477Y2 (en) | ||
| SU726675A1 (en) | Electret microphone | |
| JPS5830399Y2 (en) | condenser microphone | |
| JPS5992700A (en) | Capacitor type microphone device |