JPS6120492A - Non-directivity microphone - Google Patents

Non-directivity microphone

Info

Publication number
JPS6120492A
JPS6120492A JP14085884A JP14085884A JPS6120492A JP S6120492 A JPS6120492 A JP S6120492A JP 14085884 A JP14085884 A JP 14085884A JP 14085884 A JP14085884 A JP 14085884A JP S6120492 A JPS6120492 A JP S6120492A
Authority
JP
Japan
Prior art keywords
microphone
chamber
case
wind pressure
microphone unit
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
Application number
JP14085884A
Other languages
Japanese (ja)
Inventor
Kenji Iwai
岩井　健次
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP14085884A priority Critical patent/JPS6120492A/en
Publication of JPS6120492A publication Critical patent/JPS6120492A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces
    • H04R1/086—Protective screens, e.g. all weather or wind screens

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

PURPOSE:To reduce effectively noise caused by wind pressure without a sacrifice of an acoustic characteristic by providing a caivty air chamber sufficient in size with respect to microphone unit in an interior of a microphone case and installing not only a microphone unit at an intermediate position of said chamber but also sound holes on front and other surfaces of the case. CONSTITUTION:A wind pressure applied to a sound hole 13 provided on a front surface part 10 of a case is applied to a cavity air chamber 20 through a filter member 14. However, a through hole 21 is provided on a microphone unit holder 19 to avoid the pressure difference before and behind. Moreover, since the titled microphone is constituted in such a way that the chamber 20 provided backward the unit holder 19 has an access to the outside through a sound hole 17 provided on a back surface part 11, the wind pressure generated in the chamber 20 can quickly disappear to the outside through a filter member 18; therefore a change in pressure in the chamber 20 is extremely decreased. As a result, the pressure change is hardly applied to a microphone unit 12 provided at an intermediate position of the chamber 20 in the same manner, and noise caused by wind pressure can be extremely reduced.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、箱形のマイクロホンケースを用いた無指向性
マイクロホンに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an omnidirectional microphone using a box-shaped microphone case.

従来例の構成とその問題点 第１図は従来の無指向性マイクロホンの断面図を示して
いる。以下にこの従来例の構成について第１図とともに
説明する。Structure of a conventional example and its problems FIG. 1 shows a sectional view of a conventional omnidirectional microphone. The configuration of this conventional example will be explained below with reference to FIG. 1.

第１図において、１はマイクロホンケースを構成する前
面部、２は背面部、３はマイクロホンユニット、４は前
記マイクロホンケースの前面部１に設けられた音孔、５
は風圧雑音低減のために前記音孔４の内側建設けたフィ
ルター材、６は前記マイクロホンケースの前面部１の音
孔４と前記マイクロホンユニット３との間に設けられた
周波数特性をコントロールするための前気室、７は詳細
を図示していないが、前記マイクロホンユニット３に接
続された出力コード。In FIG. 1, 1 is the front part of the microphone case, 2 is the back part, 3 is the microphone unit, 4 is the sound hole provided in the front part 1 of the microphone case, and 5 is the front part of the microphone case.
6 is a filter material installed inside the sound hole 4 to reduce wind pressure noise, and 6 is a filter material provided between the sound hole 4 of the front part 1 of the microphone case and the microphone unit 3 for controlling frequency characteristics. Although the front air chamber 7 is not shown in detail, it is an output cord connected to the microphone unit 3.

次に上記従来例の動作について説明する。Next, the operation of the above conventional example will be explained.

第１図において、マイクロホンケースの前面部１に設け
た音孔４より音波が導入されると、その音波はフィルタ
ー材５を通過し、前気室６を介してマイクロホンユニッ
ト３に到達し、ここで電気信号に変換され、出力コード
７により取り出される。一方、風圧雑音について考える
と、マイクロホンケースの前面部ＩＫ設けた音孔４に加
わった風圧はフィルター材５の抵抗成分によりある程度
は低減されるが、前気室６が前記ケースの前面部ＩＫ設
けた音孔４以外の部分で密閉されているため、マイクロ
ホンユニット３の振動板にも到達し、風圧雑音として大
きく感知される。そのため、従来より風圧雑音を低減さ
せるため釦、フィルター材５のメツシー密度を高くシ、
抵抗成分を多くして風圧を低減させることが行われてい
る。In FIG. 1, when a sound wave is introduced through the sound hole 4 provided in the front part 1 of the microphone case, the sound wave passes through the filter material 5 and reaches the microphone unit 3 via the front air chamber 6, where it reaches the microphone unit 3. The signal is converted into an electrical signal by the output code 7 and taken out by the output code 7. On the other hand, considering wind pressure noise, the wind pressure applied to the sound hole 4 provided in the front part of the microphone case is reduced to some extent by the resistance component of the filter material 5, but the front air chamber 6 is Since the sound hole 4 is sealed, the sound reaches the diaphragm of the microphone unit 3, and is detected as wind pressure noise. Therefore, in order to reduce wind pressure noise compared to conventional methods, we have increased the mesh density of the button and filter material 5.
The wind pressure is reduced by increasing the resistance component.

しかしながら、このようにフィルター材５の抵抗成分を
多くしたものは、それがそのまま音響特性に悪影響を及
はすことになり、したがって、フィルター材５のメノン
ユ密度はある程度以上に高めることができず、結果とし
て風圧雑音の低減に大きな支障を与えるという問題があ
った。However, when the resistance component of the filter material 5 is increased in this way, it directly affects the acoustic characteristics, and therefore, the menonyu density of the filter material 5 cannot be increased beyond a certain level. As a result, there was a problem in that it greatly hindered the reduction of wind pressure noise.

発明の目的 本発明は、上記従来例の欠点を除去するものであシ、簡
単な構成で音響特性を犠牲にすることなく、効果的に風
圧雑音を低減することのできる優れた無指向性マイクロ
ホンを提供することを目的とするものである。OBJECTS OF THE INVENTION The present invention eliminates the drawbacks of the conventional examples described above, and provides an excellent omnidirectional microphone that has a simple configuration and can effectively reduce wind pressure noise without sacrificing acoustic characteristics. The purpose is to provide the following.

発明の構成 本発明は、上記目的を達成するために、マイクロホンケ
ースの内部にマイクロホンユニットに対し、十分な大き
さの空洞気室を設け、この気室の中間部位にマイクロホ
ンユニットを設置し、かつ音孔を前記ケースの前面部、
および前面部を除く少なくとも他の一面にそれぞれ設け
、前記前面部忙殺けた音孔からの風圧による前記気室内
部の風圧を前記他の一面忙殺けた音孔より抜き去り、マ
イクロホンユニットに加わる風圧雑音を低減させるよう
に構成したものである。Structure of the Invention In order to achieve the above object, the present invention provides a hollow air chamber having a sufficient size for the microphone unit inside a microphone case, and installs the microphone unit in the middle of this air chamber. Place the sound hole in the front part of the case,
and on at least one other surface other than the front surface, the wind pressure inside the air chamber due to the wind pressure from the sound holes busy on the front surface is extracted from the sound holes busy on the other surface, and the wind pressure noise applied to the microphone unit is removed. This structure is designed to reduce the

実施例の説明 以下に本発明の一実施例の構成について図面とともに説
明する。DESCRIPTION OF THE EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings.

第２図において、１０けマイクロホンケースを構成する
前面部、１１はマイクロホンケースを構成する背面部、
１２はマイクロホンユニット。In FIG. 2, 10 is a front part that makes up a microphone case, 11 is a back part that makes up a microphone case,
12 is a microphone unit.

１３は前記ケースの前面部ＩＫ設けた音孔、１４は前記
音孔１３の内側に設けたフィルター材。13 is a sound hole provided on the front surface of the case; 14 is a filter material provided inside the sound hole 13;

１５はマイクロホンユニットホルダ１９とマイクロホン
ユニット１２の前面との間に形成された前気室、１６は
出力コード２１７は背面部に設けた音孔、１８はこの音
孔１７の内側に設けたフィルター材、２０ｈマイクロホ
ンユニットホルタ１９０前後にそれぞれ設けられた空洞
気室、２１はマイクロホンユニットホルダ１９に設けら
れ、空洞気室２０間に通気性をもたせ、マイクロホンユ
ニットホルダ１９の前後とも、極力相互に圧力差が生じ
ないようにするだめの貫通孔、２２は空洞気室２０とは
隔離された別の空洞気室である。15 is a front air chamber formed between the microphone unit holder 19 and the front surface of the microphone unit 12; 16 is an output cord 217; a sound hole provided on the back side; 18 is a filter material provided inside this sound hole 17. , 20h Cavity air chambers 21 are provided in front and rear of the microphone unit holder 190, respectively, and air permeability is provided between the cavity air chambers 20, and the pressure difference between the front and rear of the microphone unit holder 19 is minimized. The through hole 22 which prevents the occurrence of air pollution is a separate hollow air chamber isolated from the hollow air chamber 20.

次に上記実施例の動作について説明する。Next, the operation of the above embodiment will be explained.

ケースの前面部１０に設けた音孔１３に加わる風圧はフ
ィルター材１４を通過して空洞気室２０に加わる。しか
し、マイクロホンユニットホルダ１９には、その前後に
圧力差が生じないように貫通孔２１が設けられており、
シ、かも、ユニットホルダ１９の後方に設けた空洞気室
２０が背面部１１に設けた音孔１７を通して外部に通ず
るように構成されているため、フィルター材１８を通じ
て空洞気室２０内に発生した風圧が、すみやかに外部へ
抜けることになり、空洞気室２０内の圧力変化が極めて
少なくなる。Wind pressure applied to the sound hole 13 provided in the front part 10 of the case passes through the filter material 14 and is applied to the hollow air chamber 20. However, the microphone unit holder 19 is provided with a through hole 21 so that no pressure difference occurs before and after the microphone unit holder 19.
Also, since the hollow air chamber 20 provided at the rear of the unit holder 19 is configured to communicate with the outside through the sound hole 17 provided on the back surface 11, noise generated inside the hollow air chamber 20 through the filter material 18 The wind pressure is quickly released to the outside, and the pressure change inside the hollow air chamber 20 is extremely small.

従って、空洞気室２０の中間部位に設けられたマイクロ
ホンユニット１２に対しても同様に圧力変化が殆んど加
わらず、風圧による雑音が極めて少なくなる。Therefore, almost no pressure change is applied to the microphone unit 12 provided at the intermediate portion of the hollow air chamber 20, and noise due to wind pressure is extremely reduced.

尚、本実施例では音孔１７をマイクロホンケースの背面
部１１に形成しているが、上記音孔１７は前記マイクロ
ホンケースの前面部１０を除く他の少なくとも一面に形
成してもよい。In this embodiment, the sound hole 17 is formed on the back surface 11 of the microphone case, but the sound hole 17 may be formed on at least one surface other than the front surface 10 of the microphone case.

発明の効果 本発明は上記実施例より明らかなように、マイクロホン
ケースの前面部に設けた音孔より加わる風圧をマイクロ
ホンケースの内部に設けた空洞気室を通じて効果的に背
面に抜き去るようにしており、風圧による雑音成分を著
しく低減させることができるという利点を有する。そし
て本発明によれば、マイクロホンケースの前面部、背面
部に形成した音孔の内側に設けたフィルター材として、
メツシー密度の低いものを用いても、充分に風圧による
雑音成分を低減させることができ、したがって、全体と
して、音響特性を犠牲にすることなく、雑音成分を低減
させることができるという利点を有する。Effects of the Invention As is clear from the above-mentioned embodiments, the present invention effectively extracts the wind pressure applied from the sound hole provided in the front part of the microphone case to the back side through the hollow air chamber provided inside the microphone case. This has the advantage that noise components due to wind pressure can be significantly reduced. According to the present invention, as a filter material provided inside the sound holes formed in the front and back parts of the microphone case,
Even if a device with a low mesh density is used, it is possible to sufficiently reduce the noise component due to wind pressure, and therefore, there is an advantage that the noise component can be reduced without sacrificing the acoustic characteristics as a whole.

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

第１図は従来の無指向性マイクロホンの断面図、第２図
は本発明の一実施例における無指向性マイクロホンの断
面図である。 １２・・マイクロホンユニット、１３．１７・・・音孔
、１４．１８・・・フィルター材、１９・・マイクロホ
ンユニットホルダ、２０．２２・・・空洞気室、２１・
・・貫通孔。 代理人の氏名　弁理士　中　尾　敏　男　ほか１名第１
図 第２図FIG. 1 is a sectional view of a conventional omnidirectional microphone, and FIG. 2 is a sectional view of an omnidirectional microphone according to an embodiment of the present invention. 12...Microphone unit, 13.17...Sound hole, 14.18...Filter material, 19...Microphone unit holder, 20.22...Cavity air chamber, 21...
...Through hole. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

【特許請求の範囲】[Claims] 箱形のマイクロホンケース内に空洞気室を設けこの空洞
気室の中間部位にマイクロホンユニットを設置し、前記
ケースの前面部、および前面部を除く少なくとも他の一
面に、それぞれ前記空洞気室に連通する音孔を設け、前
記ケースの前面部に設けた前記音孔からの風圧を前記ケ
ースの前面部を除く少なくとも他の一面に設けた前記音
孔を通して抜き去るように構成した無指向性マイクロホ
ン。A hollow air chamber is provided in a box-shaped microphone case, and a microphone unit is installed in the middle of this hollow air chamber, and a front portion of the case and at least one other surface other than the front portion are respectively communicated with the hollow air chamber. The omnidirectional microphone is provided with a sound hole provided in the front part of the case, and configured so that the wind pressure from the sound hole provided in the front part of the case is extracted through the sound hole provided in at least one other surface other than the front part of the case.
JP14085884A 1984-07-06 1984-07-06 Non-directivity microphone Pending JPS6120492A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14085884A JPS6120492A (en) 1984-07-06 1984-07-06 Non-directivity microphone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14085884A JPS6120492A (en) 1984-07-06 1984-07-06 Non-directivity microphone

Publications (1)

Publication Number Publication Date
JPS6120492A true JPS6120492A (en) 1986-01-29

Family

ID=15278374

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14085884A Pending JPS6120492A (en) 1984-07-06 1984-07-06 Non-directivity microphone

Country Status (1)

Country Link
JP (1) JPS6120492A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5879428A (en) * 1995-11-07 1999-03-09 The Furukawa Electric Co., Ltd. Apparatus for manufacturing optical fiber preform
JP2021106371A (en) * 2019-12-27 2021-07-26 パイオニア株式会社 Sound collector
JP2021106372A (en) * 2019-12-27 2021-07-26 パイオニア株式会社 Sound collector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5879428A (en) * 1995-11-07 1999-03-09 The Furukawa Electric Co., Ltd. Apparatus for manufacturing optical fiber preform
JP2021106371A (en) * 2019-12-27 2021-07-26 パイオニア株式会社 Sound collector
JP2021106372A (en) * 2019-12-27 2021-07-26 パイオニア株式会社 Sound collector

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