JPS61278295A - Directional dynamic microphone unit - Google Patents

Abstract

PURPOSE:To attain a relatively small-sized, wide band and a highly sensitive titled unit by providing a space having an added mass to a part of a phase shifting circuit composed of a magnetic yoke and a case. CONSTITUTION:On the outer peripheral surface of a phase shifting circuit acoustic terminal 106c disposed in a case 106, a phase shifting circuit acoustic filter 109 is bonded. The case 106 is combined with a magnetic yoke 102 used as an external case and the case 106 is fastened and fixed to the magnetic yoke through a screw section 102a of the magnetic yoke 102 and a screw section 106a of the case 106. Thereby, the upper end section 106d of the case 106 tightly contacts with the inner surface flat section 102c of the magnetic yoke 102 and a groove section 106b disposed in a part of the upper end section 106d of the case 106 is formed as a space having an added mass. By the added mass of this space, without increasing a mass of an oscillating system (oscillating plate 104 and voice coil 105) and the capacity of an inner air chamber 111 and a rear air chamber 112, a resonance frequency of can be lowered, W in the resonance frequency of can be improved and a relatively small-sized, wide band, and a highly sensitive titled unit can be obtained.

Description

【発明の詳細な説明】 産業上の利用分野 本発明はボーカル用及びスピーチ用を主用途とする指向
性ダイナミックマイクロホンユニットに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a directional dynamic microphone unit mainly used for vocals and speeches.

従来の技術 従来の指向性ダイナミックマイクロホンユニットは第２
図に示すように、磁石１、外ケースを兼ねる磁気ヨーク
２、ポールピース３、振動板４、振動板４に装着された
ボイスコイル５、ケース６、後部ケース７、イコライザ
８、移相回路音響フィルター９、後部音響フィルター１
０、磁気ヨーク２とケース６にて形成された内部気室１
１、後部気室１２から構成されるものであった。Conventional technology A conventional directional dynamic microphone unit
As shown in the figure, a magnet 1, a magnetic yoke 2 which also serves as an outer case, a pole piece 3, a diaphragm 4, a voice coil 5 attached to the diaphragm 4, a case 6, a rear case 7, an equalizer 8, a phase shift circuit acoustic Filter 9, rear acoustic filter 1
0. Internal air chamber 1 formed by magnetic yoke 2 and case 6
1. It consisted of a rear air chamber 12.

発明が解決しようとする問題点 しかしながら、上記指向性ダイナミックマイクロホンユ
ニットに於いて、共振周波数ｆｏ及び共振周波数ｆ、に
於けるＱは、振動板４のスチフネス、振動板４に貼付け
られたボイスコイル５の質量、磁気ヨーク２とケース６
にて形成された内部気室１１および、後部気室１２の付
加質量にて決定づけられるものであるが、周波数特性の
広帯域化実現を目的とし、振動板４のスチフネスを小さ
くするためには振動板４を薄くする必要が生じ不安定な
ものとなり、ボイスコイル５の質量を増すことは感度低
下を招き不利となり、内部気室１１及び後部気室１２の
付加質質量を増すためには大形化しなければならないと
いう欠点があった。本発明はこのような欠点を除去し、
広帯域で高感度の比較的問題点を解決するための手段 本発明は上記目的を達成するために、磁気ヨーク及びケ
ースにて形成される移相回路音響端子の一部に付加質量
をなす隙間を設け、振動系（振動板及びボイスコイル）
の質量、内部気室及び後部気室の容積を増すことなく共
振周波数ｆＯを低くすると同時に、共振周波数ｆ、に於
けるＱを高くすることを実現したものである。Problems to be Solved by the Invention However, in the above-mentioned directional dynamic microphone unit, the resonance frequency fo and the Q at the resonance frequency f are determined by the stiffness of the diaphragm 4 and the voice coil 5 attached to the diaphragm 4. The mass of magnetic yoke 2 and case 6
This is determined by the additional mass of the internal air chamber 11 and the rear air chamber 12 formed in Increasing the mass of the voice coil 5 causes a decrease in sensitivity, which is disadvantageous, and increasing the additional mass of the internal air chamber 11 and the rear air chamber 12 requires making it larger. There was a drawback that it had to be done. The present invention eliminates such drawbacks and
Means for Solving the Problem of Relatively High Sensitivity in Broad Band In order to achieve the above object, the present invention provides a gap forming an additional mass in a part of the acoustic terminal of the phase shift circuit formed by the magnetic yoke and the case. Installation, vibration system (diaphragm and voice coil)
This is achieved by lowering the resonance frequency fO without increasing the mass of the engine or increasing the volumes of the internal air chamber and the rear air chamber, and at the same time increasing the Q at the resonance frequency f.

作用 本発明は上記のような構成により次のような効果を有す
る。すなわち、磁気ヨークとケースにて形成される移相
回路音響端子の一部に付加質量を有する隙間を設けるこ
とにより、比較的小形にて広帯域、高感度を実現できる
という効果を有する。Operation The present invention has the following effects due to the above-described configuration. That is, by providing a gap having additional mass in a part of the phase shift circuit acoustic terminal formed by the magnetic yoke and the case, it is possible to realize a wide band and high sensitivity with a relatively small size.

実施例 第１図は本発明の一実施例の構成を示すものである。第
１図に於いて、１０１は磁石、１０２は外ケースを兼ね
る磁気ヨーク、１０３はポールピース、１０２ａは外ケ
ースを兼ねる磁気ヨーク１０２の下部内面に設けられた
ネジ部、１０４は振動板、１０５は振動板１０４に装着
されたボイスコイル、」０６はケースであり、その外周
には磁気ヨーク１０２のネジ部１０２ａに噛合するネジ
部１０６ａが設けである。また、ケース１０６の上部端
１０６ｄには溝部１０６ｂ及び移相回路音響端子１０６
ｃが設けである。１０７は後部ケース、１０８はイコラ
イザ、１０９は移相回路音響フィルター、１１０は後部
音響フィルター、１１１は内部気室、１１２は後部気室
である。Embodiment FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, 101 is a magnet, 102 is a magnetic yoke that also serves as an outer case, 103 is a pole piece, 102a is a threaded portion provided on the lower inner surface of the magnetic yoke 102 that also serves as an outer case, 104 is a diaphragm, and 105 is a voice coil attached to the diaphragm 104, and 06 is a case, the outer periphery of which is provided with a threaded portion 106a that engages with the threaded portion 102a of the magnetic yoke 102. Further, the upper end 106d of the case 106 includes a groove 106b and a phase shift circuit acoustic terminal 106.
c is a provision. 107 is a rear case, 108 is an equalizer, 109 is a phase shift circuit acoustic filter, 110 is a rear acoustic filter, 111 is an internal air chamber, and 112 is a rear air chamber.

この場合、ケース１０６に設けられた移相回路音響端子
１０６ｃの外周面に移相回路音響フィルター１０９を貼
付けた後、外ケースを兼ねる磁気ヨーク１０２にケース
１０６を組み合わせ、磁気ヨーク１０２のネジ部１０２
ａとケース１０６のネジ部１０６ａにてケース１０６を
磁気ヨーク１０２に締め付は固定することにより、ケー
ス１０６の上部端１０６ｄが磁気ヨーク１０２の内面平
坦部１０２ｃに密着し、またケース１０６の上部端１０
６ｄの一部に設けられた溝部１０６ｂが付加質量を有す
る隙間として形成され、隙間の付加質量により振動系（
振動板１０４及びボイスコイル１０５）の質量、内部気
室１１１及び後部気室１１２の容積を増すことなく共振
周波数ｆｏを低くできると共に、共振周波数ｆｏに於け
るＱを高くすることができ、比較的小形にして広帯域、
高感度を実現することができる。In this case, after pasting the phase shift circuit acoustic filter 109 on the outer peripheral surface of the phase shift circuit acoustic terminal 106c provided in the case 106, the case 106 is assembled to the magnetic yoke 102 which also serves as an outer case, and the screw portion 102 of the magnetic yoke 102 is assembled with the case 106.
By tightening and fixing the case 106 to the magnetic yoke 102 using the threaded portion 106a of the case 106, the upper end 106d of the case 106 comes into close contact with the flat inner surface 102c of the magnetic yoke 102, and the upper end of the case 106 10
The groove portion 106b provided in a part of the groove 6d is formed as a gap having an additional mass, and the additional mass of the gap causes the vibration system (
The resonance frequency fo can be lowered without increasing the mass of the diaphragm 104 and the voice coil 105) and the volume of the internal air chamber 111 and the rear air chamber 112, and the Q at the resonance frequency fo can be increased, making it relatively Compact and wideband,
High sensitivity can be achieved.

発明の効果 本発明は上記実施例にて明らかなように、磁気ヨーク及
びケースにて形成した移相回路の一部に付加質量を有す
る隙間を設けたものであり、比較的小形にて広帯域、高
感度の指向性ダイナミックマイクロホンユニットを実現
することができるという効果を有する。Effects of the Invention As is clear from the above embodiments, the present invention provides a gap with additional mass in a part of the phase shift circuit formed by the magnetic yoke and the case, and is relatively small and has a wide band. This has the effect of realizing a highly sensitive directional dynamic microphone unit.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例に於ける指向性ダイナミック
マイクロホンユニットの側断面図、第２図は従来の指向
性ダイナミックマイクロホンユニットの側断面図である
。 １０１・・・・・・磁石、１０２・・・・・・磁気ヨー
ク、１０３・・・・・・ポールピース、１０６・・・・
・・ケース、１０６ｂ・・・・・・溝部、１０６ｃ・・
・・・・移相回路音響端子。FIG. 1 is a sectional side view of a directional dynamic microphone unit according to an embodiment of the present invention, and FIG. 2 is a sectional side view of a conventional directional dynamic microphone unit. 101... Magnet, 102... Magnetic yoke, 103... Pole piece, 106...
...Case, 106b...Groove, 106c...
...Phase shift circuit acoustic terminal.

Claims (1)

【特許請求の範囲】[Claims] 　外ケースを兼ねる磁気ヨークとケースにて形成される
移相回路音響端子の一部に付加質量をなす隙間を設けて
なる指向性ダイナミックマイクロホンユニット。A directional dynamic microphone unit that has a magnetic yoke that also serves as an outer case, and a gap that provides additional mass in a part of the phase shift circuit acoustic terminal formed by the case.