JP2008154036A - Mouthpiece - Google Patents

Mouthpiece Download PDF

Info

Publication number
JP2008154036A
JP2008154036A JP2006341102A JP2006341102A JP2008154036A JP 2008154036 A JP2008154036 A JP 2008154036A JP 2006341102 A JP2006341102 A JP 2006341102A JP 2006341102 A JP2006341102 A JP 2006341102A JP 2008154036 A JP2008154036 A JP 2008154036A
Authority
JP
Japan
Prior art keywords
front air
air chamber
microphone
mouthpiece
wall
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.)
Granted
Application number
JP2006341102A
Other languages
Japanese (ja)
Other versions
JP4535395B2 (en
Inventor
Yoshimasa Kamoto
義正 鴨頭
Yasuhiro Soda
泰弘 曽田
Daisuke Ito
大輔 伊東
Yoichi Haneda
陽一 羽田
Yuusuke Hiwazaki
祐介 日和▲崎▼
Manabu Okamoto
学 岡本
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.)
Iwatsu Electric Co Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Iwatsu Electric Co Ltd
Nippon Telegraph and Telephone Corp
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 Iwatsu Electric Co Ltd, Nippon Telegraph and Telephone Corp filed Critical Iwatsu Electric Co Ltd
Priority to JP2006341102A priority Critical patent/JP4535395B2/en
Publication of JP2008154036A publication Critical patent/JP2008154036A/en
Application granted granted Critical
Publication of JP4535395B2 publication Critical patent/JP4535395B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Details Of Audible-Bandwidth Transducers (AREA)
  • Telephone Set Structure (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mouthpiece of wider band while protecting a microphone against static electricity. <P>SOLUTION: The mouthpiece which has a front air chamber and the microphone such that a front air chamber space is partitioned with a mouthpiece wall portion, a microphone-side wall portion, and a peripheral wall, a sound hole bored in the mouthpiece wall portion guides a sound wave from outside the mouthpiece to the front air chamber space, and an internal sound hole bored in the microphone-side wall portion guides a sound wave from the front air chamber space to the microphone. The cross section of the front air chamber space is decreased from the mouthpiece wall portion to the microphone-side wall portion to make the capacity of the front air chamber space small without shortening the distance between a mouthpiece end surface and the microphone-side wall portion, thereby widening the band. A second and a first front air chamber are positioned from the mouthpiece wall portion to a sound receiving surface of the microphone, and a damper hole having a guide hole portion decreasing in cross section toward the first front air chamber and an output hole portion with fixed cross section which communicates with the first front air chamber is bored in a partition wall between both the air chambers, and a frequency determined by the shape of the output hole portion and first front air chamber capacity is boosted to widen the band. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、例えば電話機のハンドセット等において使用される送話器に関するものである。   The present invention relates to a transmitter used in, for example, a telephone handset.

従来のアナログ電話回線は、伝送周波数帯域の上限が３ないし３．４ｋＨｚであるが、ＩＳＤＮのディジタル回線では、伝送周波数帯域の上限が７ｋＨｚ程度まで広帯域化されている。さらにＩＰ回線では、２０ｋＨｚまでの音声伝送帯域を使用することも可能である。かかる広帯域の回線で通信を行えば、通話品質が向上して音声等を高品質（明瞭）に伝送できるが、通話品質を向上させるためには、更に送話器の広帯域化を実現しなければならない。そこで高音（高周波）領域における感度が優れたエレクトレット型マイクロフォン（以下、「マイクロフォン」と表示することがある）を使用し、且つ図８に示すように、送話器１０に前気室２０を設けてマイクロフォン３０の受音面側に音波を到達させることで広帯域化を図った送話器が開発された（例えば特許文献１及び２）。ここで前気室２０は、例えば略円柱形状を有し、略円柱形状の一端側の送話口壁部に複数の音孔を設けると共に他端側のマイクロフォン側壁部に内部音孔を設けたものであり、音声（音波）が、音孔から前気室２０に入り、更に内部音孔を経てマイクロフォン３０の受音面に達するようになっている。かかる前気室２０によって、音波の高音（高周波）領域が強調されて、送話器１０を広帯域化することができるが、ここで送話器１０が殆ど感度低下を生じることなく電気信号を出力できる上限周波数（トランスミッション・フレケンシー、以下「ｆｔ」と表示することがある）は、音孔の数の平方根に比例し、且つ前気室２０の容積の平方根に反比例することが知られており、ｆｔを高くするには、音孔を増やし、また前気室２０の小容積化を図る必要がある。
特開平４−３２２５４３号公報 特開平１１−８８４８４号公報 The conventional analog telephone line has an upper limit of the transmission frequency band of 3 to 3.4 kHz, but the ISDN digital line is widened to an upper limit of the transmission frequency band of about 7 kHz. Furthermore, it is possible to use a voice transmission band up to 20 kHz on the IP line. If communication is carried out using such a broadband line, the call quality is improved and voice and the like can be transmitted with high quality (clear). However, in order to improve the call quality, it is necessary to further increase the bandwidth of the transmitter. Don't be. Therefore, an electret type microphone (hereinafter sometimes referred to as “microphone”) having excellent sensitivity in a high frequency (high frequency) region is used, and a front air chamber 20 is provided in the transmitter 10 as shown in FIG. Thus, a transmitter has been developed that achieves a wide band by allowing sound waves to reach the sound receiving surface side of the microphone 30 (for example, Patent Documents 1 and 2). Here, the front air chamber 20 has, for example, a substantially cylindrical shape, and a plurality of sound holes are provided in the mouthpiece wall portion on one end side of the substantially cylindrical shape, and an internal sound hole is provided in the microphone side wall portion on the other end side. The sound (sound wave) enters the front air chamber 20 through the sound hole, and further reaches the sound receiving surface of the microphone 30 through the internal sound hole. The front air chamber 20 emphasizes the high-frequency (high-frequency) region of the sound wave and can widen the transmitter 10, but the transmitter 10 outputs an electrical signal with almost no decrease in sensitivity. The upper frequency limit (transmission frequency, sometimes referred to as “ft”) is known to be proportional to the square root of the number of sound holes and inversely proportional to the square root of the volume of the front air chamber 20, In order to increase ft, it is necessary to increase the number of sound holes and to reduce the volume of the front air chamber 20.
JP-A-4-322543 JP 11-88484 A

前気室を備えた送話器を小型化すると、前気室の容積を小さくできて広帯域化に好都合である一方、送話口壁部の面積が小さくなるから、音孔の数の減少を余儀なくされて広帯域化の障害となる。また前気室は、送話口壁部とマイクロフォンとを隔てて、マイクロフォンを静電気から保護する役割を担うため、前気室の小容積化にも限界がある。また送話器の小型化を図らない場合には、音孔の数を増やすことができる一方、前気室の小容積化に限界が生じて広帯域化の障害となる。そこで本発明は、前気室の一端面とマイクロフォンとを隔てつつ、前気室の更なる小容積化を図って、マイクロフォンを静電気から保護しつつ広帯域化を図る送話器の実現を課題とするものである。   If the transmitter with the front air chamber is downsized, the volume of the front air chamber can be reduced and it is convenient for widening the band.On the other hand, the area of the wall of the mouthpiece is reduced, so the number of sound holes is reduced. Being forced to become a hindrance to broadband. Further, since the front air chamber plays a role of protecting the microphone from static electricity by separating the mouthpiece wall portion and the microphone, there is a limit to reducing the volume of the front air chamber. If the transmitter is not downsized, the number of sound holes can be increased. However, there is a limit in reducing the volume of the front air chamber, which hinders widening the bandwidth. Accordingly, the present invention has an object to realize a transmitter that achieves a wider band while protecting the microphone from static electricity while further reducing the volume of the front air chamber while separating the one end surface of the front air chamber from the microphone. To do.

上記課題を解決するために本発明に係る送話器は、請求項１に記載のとおり、前気室及びマイクロフォンを有し、前気室は、一端側に送話口壁部を他端側にマイクロフォン側壁部を有し、前気室の前気室空間は、送話口壁部とマイクロフォン側壁部と周壁とで画され、送話口壁部に設けられた音孔が該送話器の外部からの音波を前気室空間に導き、マイクロフォン側壁部に設けられた内部音孔が前気室空間から音波をマイクロフォンの受音面に導く送話器において、前気室空間は、送話口壁部とマイクロフォン側壁部とを結ぶ線分と直交する断面が送話口壁部からマイクロフォン側壁部に向け面積が減少する構成を有している。このように該送話器は、前気室空間の断面積をマイクロフォン側壁部に向け減少する構成を有して、送話口壁部とマイクロフォンとの距離を短縮することなく、すなわちマイクロフォンを静電気から保護しつつ、前気室の小容積化（前気室空間の小容積化）を図って、広帯域化を実現するものである。   In order to solve the above problems, a transmitter according to the present invention has a front air chamber and a microphone as claimed in claim 1, and the front air chamber has a mouthpiece wall on one end side and the other end side. The front air chamber space of the front air chamber is defined by a mouthpiece wall portion, a microphone side wall portion, and a peripheral wall, and a sound hole provided in the mouthpiece wall portion includes the microphone. In a transmitter that guides sound waves from the outside to the front air chamber space, and an internal sound hole provided in the side wall of the microphone guides sound waves from the front air space to the sound receiving surface of the microphone, the front air space is A cross section perpendicular to a line segment connecting the mouthpiece wall portion and the microphone side wall portion has a configuration in which the area decreases from the mouthpiece wall portion to the microphone side wall portion. As described above, the transmitter has a configuration in which the cross-sectional area of the front air chamber space is reduced toward the microphone side wall, and the microphone is electrostatically discharged without reducing the distance between the microphone wall and the microphone. In this way, the volume of the front air chamber is reduced (the volume of the front air chamber space is reduced) while protecting from the above, thereby realizing a wide band.

請求項２に記載の送話器は、第１の前気室、第２の前気室及びマイクロフォンを有し、ダンパ孔を有する隔壁が第１の前気室と第２の前気室との間に介在し、第１の前気室の一端側には隔壁が位置し、他端側にはマイクロフォン側壁部が位置し、第１の前気室が有する第１の前気室空間は、隔壁とマイクロフォン側壁部と第１の周壁とで画され、第２の前気室の一端側には送話口壁部が位置し、他端側には隔壁が位置し、第２の前気室が有する第２の前気室空間は、送話口壁部と隔壁と第２の周壁とで画され、送話口壁部に設けられた音孔が該送話器の外部からの音波を、第２の前気室空間に導き、更にダンパ孔が第２の前気室空間からの音波を第１の前気室空間に導いて、マイクロフォン側壁部（もしくはマイクロフォン側壁部の近傍）に位置づけられたマイクロフォンの受音面に音波が到達し、ダンパ材がダンパ孔の第１の前気室側に位置づけられた送話器において、ダンパ孔は、第２の前気室から第１の前気室に向け孔断面の面積が減少するガイド孔部と、このガイド孔部に連接して第１の前気室に連通する孔断面の面積が一定の出力孔部とを有している。   The transmitter according to claim 2 includes a first front air chamber, a second front air chamber, and a microphone, and a partition having a damper hole includes the first front air chamber, the second front air chamber, and the second front air chamber. The first front air chamber has a partition wall on one end side and a microphone side wall on the other end side, and the first front air chamber has a first front air space. A partition wall, a microphone side wall, and a first peripheral wall, a mouthpiece wall is located on one end side of the second front air chamber, and a partition wall is located on the other end side. A second front air chamber space of the air chamber is defined by a mouthpiece wall portion, a partition wall, and a second peripheral wall, and a sound hole provided in the mouthpiece wall portion is provided from the outside of the transmitter. The sound wave is guided to the second front air chamber space, and the damper hole guides the sound wave from the second front air chamber space to the first front air space, and the microphone side wall (or near the microphone side wall). In In the transmitter in which the sound wave reaches the sound receiving surface of the placed microphone and the damper material is positioned on the first front air chamber side of the damper hole, the damper hole is the first from the second front air chamber. A guide hole portion whose hole cross-sectional area decreases toward the front air chamber, and an output hole portion having a constant hole cross-section area connected to the guide hole portion and communicating with the first front air chamber. Yes.

このように請求項２に記載の送話器は、第２の前気室と第１の前気室を有するから、送話口とマイクロフォンとを隔てて、マイクロフォンを静電気から保護しつつ、隔壁のダンパ孔と第１の前気室空間の容積とで決まる周波数（例えば所望のｆｔの約２分の１から３分の１前後の中域周波数）特性をブーストすることで、高域周波数特性もブーストして、ｆｔを高くすることができる。かくしてブーストされた中域周波数特性をダンパ材のダンパ効果（吸音効果）で平坦化して、低周波領域から高周波領域にわたってマイクロフォンの出力電圧を平坦化することができるが、ｆｔを高くするためには、ブーストする中域周波数を高くしなければならないところ、ブーストされる中域周波数がダンパ孔の出力孔部の長さの平方根に反比例するため、隔壁を薄くすることなく（隔壁の強度を維持しつつ）中域周波数を所望の周波数に設定する必要がある。   Thus, since the transmitter according to claim 2 has the second front air chamber and the first front air chamber, the microphone is separated from the mouth opening and the microphone, and the partition wall is protected from static electricity. By boosting the frequency characteristic determined by the damper hole and the volume of the first anterior chamber space (for example, the mid-frequency around 1 to 3 times the desired ft), the high frequency characteristics Can also be boosted to increase ft. Thus, the boosted mid-frequency characteristics can be flattened by the damper effect (sound absorption effect) of the damper material, and the output voltage of the microphone can be flattened from the low-frequency region to the high-frequency region. Because the boosted mid-frequency must be increased, the boosted mid-frequency is inversely proportional to the square root of the length of the output hole of the damper hole. However, it is necessary to set the mid-range frequency to a desired frequency.

そこで該送話器は、ダンパ孔を、第２の前気室から第１の前気室に向け孔断面の面積が減少するガイド孔部と、このガイド孔部に連接して第１の前気室に連通する孔断面の面積が一定の出力孔部とで構成し、ダンパ孔の出力孔部の長さの平方根に反比例する中域周波数でブーストすることで、隔壁を薄くすることなく（隔壁の強度を維持しつつ）中域周波数を高域周波数領域に近づけて、高域周波数特性を改善することができる。また該送話器は、送話口とマイクロフォンとを隔てる第１の前気室を有するから、第２の前気室を小容積化が可能となって、高域周波数特性を改善することができる。   Therefore, the transmitter has a damper hole connected from the second front air chamber to the first front air chamber, a guide hole portion in which the area of the hole cross section decreases, and the guide hole portion connected to the first front air chamber. It is composed of an output hole portion having a constant hole cross-sectional area communicating with the air chamber, and boosted at a mid-range frequency inversely proportional to the square root of the length of the output hole portion of the damper hole without making the partition wall thinner ( The high frequency characteristics can be improved by bringing the mid frequency close to the high frequency range (while maintaining the strength of the partition walls). In addition, since the transmitter has a first front air chamber that separates the mouthpiece and the microphone, the second front air chamber can be reduced in volume, and high frequency characteristics can be improved. it can.

第２の前気室空間が、送話口壁部と隔壁とを結ぶ線分と、直交する平面において、送話口壁部から隔壁に向け断面積を減少するものであるときには（請求項３）、第２の前気室の小容積化が図られて、該送話器の更なる広帯域化を実現できる。   When the second front air chamber space has a cross-sectional area that decreases from the mouthpiece wall portion toward the partition wall in a plane orthogonal to the line segment connecting the mouthpiece wall portion and the partition wall (claim 3). ), The volume of the second front air chamber can be reduced, and further widening of the transmitter can be realized.

以上のべたとおり、本発明にかかる送話器によれば、マイクロフォンを静電気から保護しつつ広帯域化を実現することができる。   As described above, according to the transmitter according to the present invention, it is possible to realize a wide band while protecting the microphone from static electricity.

以下、図面を参照して、本発明にかかる送話器を説明する。   Hereinafter, a transmitter according to the present invention will be described with reference to the drawings.

図１ないし図４に基づき、本発明にかかる送話器の一実施例（実施例１）について説明する。図１はハンドセット１の外観例を示すものであり（図１中の２は送話器側端部）、図２は送話器側端部２に含まれる送話器１０の概略断面構成を示す図である。送話器１０は前気室２０及びマイクロフォン３０を有している。前気室２０は一端側に送話口壁部２１を他端側にマイクロフォン側壁部２２を有している。前気室２０の前気室空間２０ａは、送話口壁部２１とマイクロフォン側壁部２２と周壁２３とで画されている。ここで周壁２３は、円柱形状の外形を有し、一方がハンドセット１の本体１ａから延出した周壁１ｂ内に挿入されて、周壁２３の端部が送話口壁部２１に当接し、周壁２３の他方にはマイクロフォン３０が挿入され保持されている。なおマイクロフォン３０は印刷基板３１に取り付けられ、印刷基板３１を介して図示しない回路に音声信号を伝達する。   An embodiment (Example 1) of a transmitter according to the present invention will be described with reference to FIGS. FIG. 1 shows an example of the appearance of a handset 1 (2 in FIG. 1 is a transmitter-side end), and FIG. 2 is a schematic cross-sectional configuration of a transmitter 10 included in the transmitter-side end 2. FIG. The transmitter 10 has a front air chamber 20 and a microphone 30. The front air chamber 20 has a mouthpiece wall 21 on one end and a microphone side wall 22 on the other end. A front air space 20 a of the front air chamber 20 is defined by a mouthpiece wall 21, a microphone side wall 22, and a peripheral wall 23. Here, the peripheral wall 23 has a cylindrical outer shape, one of which is inserted into the peripheral wall 1 b extending from the main body 1 a of the handset 1, and the end of the peripheral wall 23 abuts on the mouthpiece wall portion 21. A microphone 30 is inserted and held on the other side of 23. The microphone 30 is attached to the printed circuit board 31 and transmits an audio signal to a circuit (not shown) via the printed circuit board 31.

上記構成を有する送話器１０では、外部からの音波は、送話口壁部２１に設けられた音孔２１ａを通過して前気室空間２０ａに導かれ、更にマイクロフォン側壁部２２に設けられた内部音孔２２ａからマイクロフォン３０の受音面に導かれる。ここで、前気室空間２０ａは、送話口壁部２１とマイクロフォン側壁部２２とを結ぶ直線（例えば周壁２３の中心線）と直交する断面が送話口壁部２１からマイクロフォン側壁部２２に向け面積が減少するよう（円錐台形状）に構成されている。従って前気室空間２０ａは、送話口壁部２１の前気室空間２０ａ側の径と等しい径の円柱状形状空間よりも容積が小さい。   In the transmitter 10 having the above-described configuration, the sound wave from the outside passes through the sound hole 21 a provided in the mouthpiece wall portion 21 and is guided to the front air chamber space 20 a and is further provided in the microphone side wall portion 22. Then, the sound is guided from the internal sound hole 22 a to the sound receiving surface of the microphone 30. Here, the front air chamber space 20a has a cross section perpendicular to a straight line (for example, a center line of the peripheral wall 23) connecting the mouthpiece wall portion 21 and the microphone side wall portion 22 from the mouthpiece wall portion 21 to the microphone side wall portion 22. It is comprised so that the direction area may decrease (conical truncated cone shape). Therefore, the front air chamber space 20a has a smaller volume than the cylindrical space having a diameter equal to the diameter of the mouthpiece wall 21 on the front air chamber space 20a side.

前気室空間２０ａは、送話口壁部２１側の径が２０ｍｍであり、マイクロフォン側壁部２２の径が８ｍｍであり、送話口壁部２１とマイクロフォン側壁部２２との距離が１０ｍｍであり、送話口壁部２１には、直径２ｍｍの音孔２１ａが３０個設けられている。ところで前気室空間を有する送話器のｆｔは、音孔の数をｎとし、前気室空間の容積をｃとするとき、次の（１）式で求めることができる。
ｆｔ＝ｋｔ（ｎ／ｃ）１／２・・・・（１）式
すなわちｆｔは、音孔の数ｎの平方根に比例し、且つ前気室空間２０ａの容積ｃの平方根に反比例するのである。従って送話器１０は、円錐台形状の前気室空間２０ａを有することで、送話口壁部２１とマイクロフォン３０との距離を短縮することなく、前気室空間２０ａの小容積化を図って、広帯域化を実現できる。 In the front air chamber space 20a, the diameter on the side of the mouthpiece wall 21 is 20 mm, the diameter of the microphone side wall 22 is 8 mm, and the distance between the mouthpiece wall 21 and the microphone side wall 22 is 10 mm. The mouthpiece wall 21 is provided with 30 sound holes 21a having a diameter of 2 mm. By the way, ft of the transmitter having the front air chamber space can be obtained by the following equation (1), where n is the number of sound holes and c is the volume of the front air chamber space.
ft = kt (n / c) 1/2 (1) That is, ft is proportional to the square root of the number n of sound holes and inversely proportional to the square root of the volume c of the front air chamber space 20a. . Therefore, the microphone 10 has the truncated air cone-shaped front air space 20a, so that the front air space 20a can be reduced in volume without reducing the distance between the mouth wall 21 and the microphone 30. Thus, a wide band can be realized.

次に図３を用いて送話器１０の周波数特性例について説明する。図３は、横軸が音声の周波数であり、縦軸がマイクロフォン３０の出力電圧相対値（ｄＢ）である。図３の破線Ｌ１は、前気室空間が従来の円柱形状空間である場合の周波数特性であって、ｆｔが５ｋＨｚであり、５ｋＨｚにおいて約１０ｄＢブーストしている。図３の実線Ｌ２は送話器１０の周波数特性であって、ｆｔが７ｋＨｚであり、７ｋＨｚにおいて約５ｄＢブーストしている。すなわち送話器１０は、送話口壁部２１とマイクロフォン３０との距離を短縮することなく（マイクロフォン３０を静電気から保護しつつ）、ｆｔを５ｋＨｚから７ｋＨｚに高めて広帯域化を実現できるのである。   Next, an example of frequency characteristics of the transmitter 10 will be described with reference to FIG. In FIG. 3, the horizontal axis represents the audio frequency, and the vertical axis represents the output voltage relative value (dB) of the microphone 30. A broken line L1 in FIG. 3 is a frequency characteristic when the front air chamber space is a conventional cylindrical space, and ft is 5 kHz, which is boosted by about 10 dB at 5 kHz. A solid line L2 in FIG. 3 is a frequency characteristic of the transmitter 10, where ft is 7 kHz and boosted by about 5 dB at 7 kHz. That is, the transmitter 10 can increase the frequency band from 5 kHz to 7 kHz without increasing the distance between the mouthpiece wall 21 and the microphone 30 (while protecting the microphone 30 from static electricity), thereby realizing a wide band. .

なお、送話口壁部２１とマイクロフォン側壁部２２とを結ぶ線分が直線でなくても、この線分と直交する断面が円形でなくても、送話口壁部２１からマイクロフォン側壁部２２に向け断面積を減少させれば、前気室空間２０ａの容積を小さくできる。従って、例えば図４に示すように、送話口壁部２１とマイクロフォン側壁部２２とが平行でない送話器であっても、送話器１０と同様に広帯域化ができる。   Even if the line segment connecting the mouthpiece wall portion 21 and the microphone side wall portion 22 is not a straight line, or even if the cross section orthogonal to the line segment is not circular, the microphone side wall portion 22 extends from the mouthpiece wall portion 21. If the cross-sectional area is decreased toward, the volume of the front air space 20a can be reduced. Therefore, for example, as shown in FIG. 4, even if the transmitter wall 21 and the microphone side wall 22 are not parallel, the bandwidth can be increased in the same manner as the transmitter 10.

図５ないし図７に基づき、本発明にかかる送話器の他の実施例（実施例２）について説明する。なお実施例１と同一の機能を有する構成要素には同一の符号を附して、その説明を省略する。
図５に示す送話器１０ａは、第２の前気室２６、第１の前気室２０及びマイクロフォン３０を有している。送話器１０ａでは、ダンパ孔２５を有する隔壁２４が第２の前気室２６と第１の前気室２０との間に介在し、第１の前気室２０の一端側には隔壁２４が位置し、他端側にはマイクロフォン側壁部２２が位置し、第１の前気室２０が有する第１の前気室空間２０ａは、隔壁２４とマイクロフォン側壁部２２と第１の周壁２３ａとで画されている。また第２の前気室２６の一端側には送話口壁部２１が位置し、他端側には隔壁２４が位置し、第２の前気室空間２６ａは、送話口壁部２１と隔壁２４と第２の周壁２３ｂとで画されている。上記構成を有する送話器１０ａでは、外部からの音波は、音孔２１ａから第２の前気室空間２６ａに導かれ、ダンパ孔２５を経由して、更に第１の前気室空間２０ａに導かれ、そしてマイクロフォン側壁部２２に近傍に位置づけられたマイクロフォン３０の受音面に達する。ここでダンパ孔２５は、第１の前気室側２０ａにダンパ材２７を位置づけている。 Based on FIG. 5 thru | or FIG. 7, another Example (Example 2) of the transmitter concerning this invention is demonstrated. In addition, the same code | symbol is attached | subjected to the component which has the same function as Example 1, and the description is abbreviate | omitted.
A transmitter 10 a shown in FIG. 5 includes a second front air chamber 26, a first front air chamber 20, and a microphone 30. In the transmitter 10a, a partition wall 24 having a damper hole 25 is interposed between the second front air chamber 26 and the first front air chamber 20, and a partition wall 24 is provided at one end of the first front air chamber 20. The microphone side wall portion 22 is located on the other end side, and the first front air chamber space 20a of the first front air chamber 20 includes a partition wall 24, a microphone side wall portion 22, and a first peripheral wall 23a. It is drawn in. In addition, the mouthpiece wall 21 is located on one end side of the second front air chamber 26, the partition wall 24 is located on the other end side, and the second front air space 26a is located on the mouthpiece wall 21. And a partition wall 24 and a second peripheral wall 23b. In the transmitter 10a having the above-described configuration, external sound waves are guided from the sound hole 21a to the second front air chamber space 26a, and further to the first front air chamber space 20a via the damper hole 25. It reaches the sound receiving surface of the microphone 30 that is guided and positioned in the vicinity of the microphone side wall 22. Here, the damper hole 25 positions the damper material 27 on the first front air chamber side 20a.

送話器１０ａにおける各前気室等は、次の形状等を有している。送話口壁部２１には、直径２ｍｍの音孔が３０個設けられている。そして第２の前気室空間２６ａは、直径２０ｍｍの円柱形状をなし、約５ｋＨｚ近傍における送話器１０ａの周波数特性をブーストしており、また第１の前気室空間２０ａは、０．５ｃｃの容積を有している。
次に送話器１０ａにおける広帯域化について説明する。送話器１０ａは、ダンパ孔２５の形状（図６）と第１の前気室空間２０ａの容積ｃ１で決まる周波数ｆ１の近傍において、周波数特性をブーストする作用を有するが、ｆ１は、送話器１０ａの所望のｆｔ（例えば７ｋＨｚ）よりも低い中域周波数に設定される。具体的には、ｆ１は、ダンパ孔２５の孔径ａに比例し、ダンパ孔２５の長さｂと第１の前気室２０ａの容積ｃ１との積の平方根に反比例して、次の（２）式で求めることができる。
ｆ１＝ｋ１・ａ／（ｂ・ｃ１）１／２・・・（２）式
従って、ダンパ孔２５の孔径ａを大きくすれば、ｆ１を高くできるが、孔径ａをあまり大きくすると、ダンパ材２７の効果が減少するので、孔径ａを大きくすることには限界があり、またダンパ孔２５の長さｂを短くすればｆ１を高くできるが、隔壁２４を薄くしてダンパ孔２５の長さｂを短くすると、隔壁２４の強度に問題が生じる。そこでダンパ孔２５は、第２の前気室２６から第１の前気室２０に向けて縮径する円錐台形状のガイド孔部２５ａと、第１の前気室２０ａ側に設けた孔の長さｂが０．７ｍｍで孔径ａが２．０ｍｍの円柱形状の出力孔部２５ｂとを連接して、出力孔部２５ｂの形状によってｆ１を定めている。すなわちダンパ孔２５は、ガイド孔部２５ａで隔壁２４の厚さを確保しつつ、出力孔部２５ｂでｆ１を高くすることができるのである。ここでダンパ孔２５は、第１の前気室２０ａ側にダンパ材２７（小さなメッシュを多数有する布地やスクリーン印刷用のメッシュ等）が貼り付けられている。 Each front air chamber or the like in the transmitter 10a has the following shape or the like. The mouthpiece wall 21 is provided with 30 sound holes with a diameter of 2 mm. The second front air space 26a has a cylindrical shape with a diameter of 20 mm, boosts the frequency characteristics of the transmitter 10a in the vicinity of about 5 kHz, and the first front air space 20a has 0.5 cc. Has a volume of.
Next, the widening of the transmitter 10a will be described. The transmitter 10a has an effect of boosting frequency characteristics in the vicinity of the frequency f1 determined by the shape of the damper hole 25 (FIG. 6) and the volume c1 of the first front air chamber space 20a. The mid-frequency is set lower than the desired ft (eg, 7 kHz) of the device 10a. Specifically, f1 is proportional to the hole diameter a of the damper hole 25, and inversely proportional to the square root of the product of the length b of the damper hole 25 and the volume c1 of the first front air chamber 20a. ) Equation.
f1 = k1 · a / (b · c1) 1/2 (2) Therefore, if the hole diameter a of the damper hole 25 is increased, f1 can be increased, but if the hole diameter a is increased too much, the damper material 27 Therefore, if the length b of the damper hole 25 is shortened, f1 can be increased. However, the partition wall 24 is thinned and the length b of the damper hole 25 is reduced. If the length is shortened, a problem occurs in the strength of the partition wall 24. Therefore, the damper hole 25 includes a guide hole portion 25a having a truncated cone shape whose diameter is reduced from the second front air chamber 26 toward the first front air chamber 20, and a hole provided on the first front air chamber 20a side. A cylindrical output hole 25b having a length b of 0.7 mm and a hole diameter a of 2.0 mm is connected, and f1 is determined by the shape of the output hole 25b. That is, the damper hole 25 can increase the f1 at the output hole 25b while securing the thickness of the partition wall 24 at the guide hole 25a. Here, the damper hole 25 has a damper material 27 (a cloth having a large number of small meshes, a mesh for screen printing, or the like) attached to the first front air chamber 20a side.

次に図７を用いて送話器１０ａの周波数特性例について説明する。図７の破線Ｌ３は、前気室空間２０ａの円柱状形状空間によってブーストされた周波数特性であり、約５ｋＨｚにおいて例えば約１０ｄＢブーストされたものである。図７の一点鎖線Ｌ４は、破線Ｌ３で示す周波数特性がｆ１近傍のブースト（例えば約１０ｄＢ）によって広帯域化された周波数特性である。すなわち所望のｆｔ（例えば７ｋＨｚ）よりも低い中域周波数ｆ１をブーストすることで、送話器１０ａのｆｔを高めることができるのである。   Next, an example of frequency characteristics of the transmitter 10a will be described with reference to FIG. A broken line L3 in FIG. 7 is a frequency characteristic boosted by the cylindrical shape space of the front air chamber space 20a, and is boosted by, for example, about 10 dB at about 5 kHz. A one-dot chain line L4 in FIG. 7 is a frequency characteristic in which the frequency characteristic indicated by the broken line L3 is widened by a boost (for example, about 10 dB) near f1. That is, by boosting the mid frequency f1 lower than the desired ft (for example, 7 kHz), the ft of the transmitter 10a can be increased.

図７の実線Ｌ５は、ｆ１におけるブースト量をダンパ材２７の作用によって減少させて、送話器１０ａの周波数特性を平坦化したものである（実線Ｌ５で示す周波数特性は、前気室空間２０ａの円柱状形状空間で決まる周波数特性（破線Ｌ３）と、ダンパ孔２５の形状と第１の前気室空間２０ａの容積ｃ１に依存する周波数特性（一点鎖線Ｌ４）と、ダンパ材２７で決まる周波数特性とを乗じたものとなる）。ダンパ材２７の作用によって周波数特性を平坦化すれば、中域周波数ｆ１の近傍でブースト量を適正に維持しつつ、ｆｔ（７ｋＨｚ）近傍において、マイクロフォンの出力電圧相対値を０ｄＢ前後にして、送話器の広帯域化を実現できるのである。ここで第２の前気室空間２０ａを送話器１０と同様の円錐台形状にすれば、例えば７ｋＨｚ近傍の周波数特性をさらにブーストすることができる。またマイクロフォン側壁部２２に内部音孔を設けて、第２の前気室空間２０ａからマイクロフォン３０の受音面に音波を導いてもよい。   A solid line L5 in FIG. 7 is obtained by reducing the boost amount at f1 by the action of the damper material 27 and flattening the frequency characteristic of the transmitter 10a (the frequency characteristic indicated by the solid line L5 is the front air chamber space 20a). Frequency characteristic determined by the cylindrical shape space (dashed line L3), frequency characteristics depending on the shape of the damper hole 25 and the volume c1 of the first front air chamber space 20a (dashed line L4), and frequency determined by the damper material 27 Multiplied by the characteristic). If the frequency characteristics are flattened by the action of the damper material 27, the boost value is appropriately maintained in the vicinity of the middle frequency f1, and the microphone output voltage relative value is set to around 0 dB in the vicinity of ft (7 kHz). This makes it possible to widen the bandwidth of the speaker. Here, if the second front air chamber space 20a has a truncated cone shape similar to that of the transmitter 10, for example, the frequency characteristic in the vicinity of 7 kHz can be further boosted. Further, an internal sound hole may be provided in the microphone side wall portion 22 to guide sound waves from the second front air chamber space 20a to the sound receiving surface of the microphone 30.

なお発明に係る送話器は、上記各実施例に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変形し実施できる。   The transmitter according to the present invention is not limited to the above-described embodiments, and can be appropriately modified and implemented without departing from the spirit thereof.

本発明にかかる送話器を備えたハンドセットの外観例を示すものである。The example of an external appearance of the handset provided with the transmitter concerning this invention is shown. 本発明の実施例１にかかる送話器を含む送話器側端部の概略断面構成を示す図である。It is a figure which shows schematic cross-sectional structure of the transmitter side edge part containing the transmitter concerning Example 1 of this invention. 図２の送話器における周波数特性の例を示す特性図である。It is a characteristic view which shows the example of the frequency characteristic in the transmitter of FIG. 実施例１にかかる送話器の変形例の概略断面構成を示す図である。It is a figure which shows schematic sectional structure of the modification of the transmitter concerning Example 1. FIG. 本発明の実施例２にかかる送話器を備えた部分のハンドセットの送話器近傍の概略断面構成を示す図である。It is a figure which shows schematic sectional structure of the transmitter vicinity of the part of the handset provided with the transmitter concerning Example 2 of this invention. ダンパ孔の概略断面構成例を示す図である。It is a figure which shows the schematic cross-section structural example of a damper hole. 図５の送話器における周波数特性の例を示す特性図である。It is a characteristic view which shows the example of the frequency characteristic in the transmitter of FIG. 前気室を設けた従来の送話器の概略断面構成を示す図である。It is a figure which shows schematic cross-sectional structure of the conventional transmitter provided with the front air chamber.

符号の説明Explanation of symbols

１０ 送話器
２０ 前気室、第１の前気室
２０ａ 前気室空間、第１の前気室空間
２１ 送話口壁部
２１ａ 音孔
２２ マイクロフォン側壁部
２３ 周壁
２３ａ 第１の周壁
２３ｂ 第２の周壁
２４ 内部音孔
２５ ダンパ孔
２５ａ ガイド孔部
２５ｂ 出力孔部
２６ 第２の前気室
２６ａ 第２の前気室空間
２７ ダンパ材
３０ マイクロフォン 10 transmitter 20 front air chamber, first front air chamber 20a front air chamber space, first front air chamber space 21 mouthpiece wall portion 21a sound hole 22 microphone side wall portion 23 peripheral wall 23a first peripheral wall 23b first 2 peripheral wall 24 internal sound hole 25 damper hole 25a guide hole portion 25b output hole portion 26 second front air chamber 26a second front air chamber space 27 damper material 30 microphone

Claims (3)

前気室及びマイクロフォンを有し、
前記前気室は、一端側に送話口壁部を他端側にマイクロフォン側壁部を有し、
前記前気室の前気室空間は、前記送話口壁部と前記マイクロフォン側壁部と周壁とで画され、
前記送話口壁部に設けられた音孔が該送話器の外部からの音波を前記前気室空間に導き、前記マイクロフォン側壁部に設けられた内部音孔が前記前気室空間から音波を前記マイクロフォンの受音面に導く送話器において、
前記前気室空間は、前記送話口壁部と前記マイクロフォン側壁部とを結ぶ線分と直交する断面が前記送話口壁部から前記マイクロフォン側壁部に向け面積が減少することを特徴とする送話器。 A front air chamber and a microphone;
The front air chamber has a mouthpiece wall on one end side and a microphone side wall on the other end side,
The front air chamber space of the front air chamber is defined by the mouthpiece wall portion, the microphone side wall portion, and the peripheral wall,
Sound holes provided in the mouthpiece wall portion guide sound waves from the outside of the transmitter to the front air space, and internal sound holes provided in the microphone side walls sound waves from the front air space. In a microphone that guides the microphone to the receiving surface of the microphone,
The front air chamber space is characterized in that a cross section perpendicular to a line segment connecting the mouthpiece wall and the microphone side wall decreases in area from the mouthpiece wall to the microphone side wall. A transmitter. 第１の前気室、第２の前気室及びマイクロフォンを有し、
ダンパ孔を有する隔壁が前記第１の前気室と前記第２の前気室との間に介在し、
前記第１の前気室の一端側には前記隔壁が位置し、他端側にはマイクロフォン側壁部が位置し、
前記第１の前気室が有する第１の前気室空間は、前記隔壁とマイクロフォン側壁部と第１の周壁とで画され、
前記第２の前気室の一端側には送話口壁部が位置し、他端側には前記隔壁が位置し、
前記第２の前気室が有する第２の前気室空間は、前記送話口壁部と前記隔壁と第２の周壁とで画され、
前記送話口壁部に設けられた音孔が該送話器の外部からの音波を、前記第２の前気室空間に導き、更にダンパ孔が前記第２の前気室空間からの音波を前記第１の前気室空間に導いて、前記マイクロフォン側壁部に近傍に位置づけられた前記マイクロフォンの受音面に音波が到達し、ダンパ材が前記ダンパ孔の前記第１の前気室側に位置づけられた送話器において、
前記ダンパ孔は、
前記第２の前気室から前記第１の前気室に向け孔断面の面積が減少するガイド孔部と、
このガイド孔部に連接して前記第１の前気室に連通する孔断面の面積が一定の出力孔部とを有することを特徴とする送話器。 A first front air chamber, a second front air chamber and a microphone;
A partition wall having a damper hole is interposed between the first front air chamber and the second front air chamber;
The partition is located on one end side of the first front air chamber, and the microphone side wall is located on the other end side,
A first anterior chamber space of the first anterior chamber is defined by the partition wall, a microphone side wall, and a first peripheral wall;
A mouthpiece wall is located on one end side of the second front air chamber, and the partition is located on the other end side,
A second front air chamber space of the second front air chamber is defined by the mouthpiece wall portion, the partition wall, and the second peripheral wall;
A sound hole provided in the mouthpiece wall portion guides sound waves from the outside of the transmitter to the second front air chamber space, and a damper hole generates sound waves from the second front air space. To the first front air chamber space, the sound wave reaches the sound receiving surface of the microphone positioned in the vicinity of the microphone side wall, and the damper material is on the first front air chamber side of the damper hole. In the microphone located at
The damper hole is
A guide hole portion in which an area of a hole cross section decreases from the second front air chamber toward the first front air chamber;
A transmitter having an output hole portion having a constant hole cross-sectional area connected to the guide hole portion and communicating with the first front air chamber. 前記第２の前気室空間は、前記送話口壁部と前記隔壁とを結ぶ線分と、直交する平面において、前記送話口壁部から前記隔壁に向け断面積が減少することを特徴とする請求項２に記載の送話器。   The second front air chamber space has a cross-sectional area that decreases from the mouthpiece wall portion toward the partition wall in a plane orthogonal to a line segment connecting the mouthpiece wall portion and the partition wall. The transmitter according to claim 2.
JP2006341102A 2006-12-19 2006-12-19 Transmitter Active JP4535395B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006341102A JP4535395B2 (en) 2006-12-19 2006-12-19 Transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006341102A JP4535395B2 (en) 2006-12-19 2006-12-19 Transmitter

Publications (2)

Publication Number Publication Date
JP2008154036A true JP2008154036A (en) 2008-07-03
JP4535395B2 JP4535395B2 (en) 2010-09-01

Family

ID=39655732

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006341102A Active JP4535395B2 (en) 2006-12-19 2006-12-19 Transmitter

Country Status (1)

Country Link
JP (1) JP4535395B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010278888A (en) * 2009-05-29 2010-12-09 Iwatsu Electric Co Ltd Mouthpiece
JP2017105461A (en) * 2013-11-19 2017-06-15 クラリオン株式会社 Sound collector
JP2019041359A (en) * 2017-08-29 2019-03-14 オンキヨー株式会社 Speaker device
WO2022208984A1 (en) * 2021-03-30 2022-10-06 パナソニックＩｐマネジメント株式会社 Call assisting device

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57131195A (en) * 1981-02-06 1982-08-13 Aihon Kk Noise preventing microphone device of band limiting type
JPS6126355U (en) * 1984-07-20 1986-02-17 日本電気株式会社 Telephone transmitter unit mounting structure
JPS6163193A (en) * 1984-09-04 1986-04-01 Nippon Chemicon Corp Electroacoustic transducer
JPS63219297A (en) * 1987-03-09 1988-09-12 Matsushita Electric Ind Co Ltd Microphone
JPH0298538U (en) * 1989-01-23 1990-08-06
JPH04322543A (en) * 1991-04-22 1992-11-12 Nippon Telegr & Teleph Corp <Ntt> Telephone handset
JPH07222291A (en) * 1994-02-04 1995-08-18 Rion Co Ltd Water-proofing device for microphone
JPH1188484A (en) * 1997-09-03 1999-03-30 Saitama Nippon Denki Kk Acoustic device, portable telephone set and mobile communication unit
JP2000151782A (en) * 1998-07-15 2000-05-30 Wl Gore & Assoc Gmbh Plastic capsule for acoustic transducer, acoustic transducer and its manufacture

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57131195A (en) * 1981-02-06 1982-08-13 Aihon Kk Noise preventing microphone device of band limiting type
JPS6126355U (en) * 1984-07-20 1986-02-17 日本電気株式会社 Telephone transmitter unit mounting structure
JPS6163193A (en) * 1984-09-04 1986-04-01 Nippon Chemicon Corp Electroacoustic transducer
JPS63219297A (en) * 1987-03-09 1988-09-12 Matsushita Electric Ind Co Ltd Microphone
JPH0298538U (en) * 1989-01-23 1990-08-06
JPH04322543A (en) * 1991-04-22 1992-11-12 Nippon Telegr & Teleph Corp <Ntt> Telephone handset
JPH07222291A (en) * 1994-02-04 1995-08-18 Rion Co Ltd Water-proofing device for microphone
JPH1188484A (en) * 1997-09-03 1999-03-30 Saitama Nippon Denki Kk Acoustic device, portable telephone set and mobile communication unit
JP2000151782A (en) * 1998-07-15 2000-05-30 Wl Gore & Assoc Gmbh Plastic capsule for acoustic transducer, acoustic transducer and its manufacture

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010278888A (en) * 2009-05-29 2010-12-09 Iwatsu Electric Co Ltd Mouthpiece
JP2017105461A (en) * 2013-11-19 2017-06-15 クラリオン株式会社 Sound collector
JP2019041359A (en) * 2017-08-29 2019-03-14 オンキヨー株式会社 Speaker device
WO2022208984A1 (en) * 2021-03-30 2022-10-06 パナソニックＩｐマネジメント株式会社 Call assisting device

Also Published As

Publication number Publication date
JP4535395B2 (en) 2010-09-01

Similar Documents

Publication Publication Date Title
US9245515B2 (en) Earphone
US8208673B2 (en) Miniaturized acoustic boom structure for reducing microphone wind noise and ESD susceptibility
US20140093095A1 (en) Porous cover structures for mobile device audio
DE202018107148U1 (en) Audio device with acoustic valve
JP2014155145A (en) Earphone microphone
JP4535395B2 (en) Transmitter
RU2462830C2 (en) Device for hearing protection
CN110870326B (en) Audio equipment
KR101310879B1 (en) Earphone
KR101690524B1 (en) Double Resonant Speaker Unit And Multi-Way Earphone Comprising The Same
US9813807B2 (en) Ear-canal earpiece
CN113015052B (en) Method for reducing low-frequency noise, wearable electronic equipment and signal processing module
EP1185139B1 (en) Diaphragm for speakers
US9628925B2 (en) Ear canal earpiece and earmold unit for an earpiece
US6263079B1 (en) Telephone with means for enhancing the low-frequency response
CN106028196B (en) Earphone set
JP6981178B2 (en) Transducer
US20220377454A1 (en) Apparatus for sound conversion with an acoustic filter
US6650760B1 (en) Loudspeaker
KR102020233B1 (en) Multi-driver earphone
CN208572403U (en) A kind of loudspeaker ante-chamber sound-guiding structure and its electronic device
CN108401201B (en) Microphone device and earphone comprising same
JP2017112443A (en) Narrow directivity microphone
JP2021531693A (en) Acoustic filters for coaxial electro-acoustic converters
JP4540659B2 (en) Transmitter

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20100225

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100331

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20100520

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20100609

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20100610

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130625

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Ref document number: 4535395

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140625

Year of fee payment: 4

S531 Written request for registration of change of domicile

Free format text: JAPANESE INTERMEDIATE CODE: R313531

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350