JPS6314552Y2 - - Google Patents
Info
- Publication number
- JPS6314552Y2 JPS6314552Y2 JP4368182U JP4368182U JPS6314552Y2 JP S6314552 Y2 JPS6314552 Y2 JP S6314552Y2 JP 4368182 U JP4368182 U JP 4368182U JP 4368182 U JP4368182 U JP 4368182U JP S6314552 Y2 JPS6314552 Y2 JP S6314552Y2
- Authority
- JP
- Japan
- Prior art keywords
- stiffness
- air chamber
- diaphragm
- sensitivity
- back air
- 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.)
- Expired
Links
- 230000005520 electrodynamics Effects 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Headphones And Earphones (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Description
【考案の詳細な説明】
本考案は、携帯用無線機等に用いる受話器に関
し、実耳とイヤピース間に間隙が生じた場合にも
低域感度が低下しない受話器を提供するものであ
る。[Detailed Description of the Invention] The present invention relates to a handset used for a portable radio device, etc., and provides a handset in which low-frequency sensitivity does not decrease even when a gap occurs between the real ear and the earpiece.
一般にこの種の受話器としては、電話伝送基準
に定められた周波数帯域300〜3400Hzを確保しな
ければならないため、従来この帯域をカバーする
ための自由度３の設計が一般化されている。この
場合の基本的な等価回路は第１図に示す如くであ
る。 Generally, this type of handset must secure a frequency band of 300 to 3400 Hz specified by the telephone transmission standards, and thus a three-degree-of-freedom design has been commonly used to cover this band. The basic equivalent circuit in this case is as shown in FIG.
第１図において、γ−１，ｍ−１は受話口の音
響抵抗及び質量、m0，S0は振動板の質量及びス
チフネスＦは駆動力、γ＋１，ｍ＋１は制動素子
の音響低抗及び質量、Ｓ−２は音響負荷のスチフ
ネス、Ｓ−１は前気室のスチフネス、Ｓ＋１は第
１背気室のスチフネス、Ｓ＋２は第２背気室のス
チフネスである。 In Figure 1, γ-1, m-1 are the acoustic resistance and mass of the earpiece, m 0 , S 0 are the mass and stiffness F of the diaphragm, and γ+1, m+1 are the acoustic resistance and mass of the damping element. , S-2 is the stiffness of the acoustic load, S-1 is the stiffness of the front air chamber, S+1 is the stiffness of the first back air chamber, and S+2 is the stiffness of the second back air chamber.
ここで上限の周波数3400Hzをカバーするには振
動系の共振周波数0′を
S0：振動板等価スチフネス
S1：音響負荷、前気室の合成スチフネス
S2：背気室合成スチフネス
m0：振動板質量
程度にする。 Here, to cover the upper limit frequency of 3400Hz, the resonance frequency of the vibration system is set to 0 ′. S 0 : Equivalent stiffness of the diaphragm S 1 : Combined stiffness of acoustic load and front air chamber S 2 : Combined stiffness of the back air chamber m 0 : Set to approximately the mass of the diaphragm.
ここでスチフネス制御として動作する低域周波
数に着目した場合、カツプラ内音圧Ｐは次式で与
えられる。 Here, when focusing on the low frequency that operates as stiffness control, the sound pressure P in the coupler is given by the following equation.
Ｐ＝ΔV／Ｖ・γP0＝Ｆ／S0＋S1＋S2・γP0／Ｖ……(
2)
ΔV：振動板の体積変位
Ｖ：カツプラ容積（第１前気室を含む）
γ：空気の比熱比、P0：カツプラ内空気の
静圧力
(2)式から感度を上げるためには、（S0＋S1＋S2）
を小さくする必要がある。ここでS0がS1及びS2よ
り大きい場合、低周波での感度は振動板スチフネ
スS0の大小による影響が大きく、更にスチフネス
S0は振動数の板厚の３乗に比例するため製造上の
管理が厳しくなる。 P=ΔV/V・γP 0 =F/S 0 +S 1 +S 2・γP 0 /V……(
2) ΔV: Volume displacement of the diaphragm V: Capacity (including the first front air chamber) γ: Specific heat ratio of air, P 0 : Static pressure of the air inside the coupling (2) In order to increase the sensitivity, (S 0 + S 1 + S 2 )
needs to be made smaller. Here, if S 0 is larger than S 1 and S 2 , the sensitivity at low frequencies is greatly influenced by the magnitude of the diaphragm stiffness S 0 , and the stiffness
Since S 0 is proportional to the cube of the vibration frequency and the plate thickness, manufacturing control becomes strict.
本考案は振動数スチフネスの感度に及ぼす影響
を少なくすると同時に、実耳とレヤピース間でリ
ークが生じても低域感度が低下しない受話器を提
供するものである。 The present invention reduces the influence of frequency stiffness on sensitivity, and at the same time provides a handset in which low frequency sensitivity does not decrease even if leakage occurs between the real ear and the layer piece.
以下に本考案の一実施例について第２図ととも
に説明する。 An embodiment of the present invention will be described below with reference to FIG.
第２図において、１は環状の溝２が形成された
磁石であり、この磁石１は内筐体３内に固定され
ている。４は制動素子であり、この制動素子４は
例えば内筐体３の底面に孔を形成し、この孔内に
不識布等を収納して構成される。５は振動板であ
り、この振動板５のエツジ部は上記内筐体３の上
面に支持されている。６は振動板５に結合された
ボビンであり、このボビン６にボイスコイル７が
巻回されている。上記内筐体３は外筐体８内に固
定される。９は外筐体８の開口部に設けられたイ
ヤピースであり、このイヤピース９には孔１０が
形成されている。１１は外筐体８に形成された孔
である。また第２図において、は前気室、は
振動板５と内筐体３とで仕切られた第１背気室
は内筐体３と外筐体８とで仕切られた第２背気室
であり、第１背気室と第２背気室とは制動素
子４を介して連通している。 In FIG. 2, reference numeral 1 denotes a magnet in which an annular groove 2 is formed, and this magnet 1 is fixed within an inner casing 3. 4 is a braking element, and this braking element 4 is constructed by, for example, forming a hole in the bottom surface of the inner casing 3 and storing a piece of cloth or the like in the hole. Reference numeral 5 denotes a diaphragm, and an edge portion of the diaphragm 5 is supported on the upper surface of the inner casing 3. A bobbin 6 is connected to the diaphragm 5, and a voice coil 7 is wound around the bobbin 6. The inner casing 3 is fixed within the outer casing 8. Reference numeral 9 denotes an earpiece provided in the opening of the outer housing 8, and a hole 10 is formed in the earpiece 9. 11 is a hole formed in the outer casing 8. Further, in FIG. 2, denotes a front air chamber, denotes a first back air chamber partitioned by the diaphragm 5 and the inner case 3, and a second back air chamber partitioned by the inner case 3 and the outer case 8. The first back air chamber and the second back air chamber communicate with each other via the braking element 4.
本実施例においては、S0を小さくするために、
動電型変換器を使用し、また第１、第２背気室
，の合成スチフネスS2を大きくするために背
気室，の容積を小さくしているものである。 In this example, in order to reduce S 0 ,
An electrodynamic transducer is used, and the volume of the back air chamber is reduced in order to increase the combined stiffness S2 of the first and second back air chambers.
第３図は第１、第２背気室，の合成スチフ
ネスS2と、音響負荷、前気室の合成スチフネス
S1との和と、振動板等価スチフネスS0との比（S1
＋S2）／S0に対する感度偏差、すなわち、所定の
（S1＋S2）／S0における振動板等価スチフネスS0
の±50％の変化に対する感度のばらつきを示して
いる。なお、S0の±50％の変化に対し、感度のば
らつきが±1dBであれば実用上問題はない。 Figure 3 shows the composite stiffness S 2 of the first and second back air chambers, the acoustic load, and the composite stiffness of the front air chamber.
S 1 and the ratio of the diaphragm equivalent stiffness S 0 (S 1
+S 2 )/S 0 sensitivity deviation, that is, the diaphragm equivalent stiffness S 0 at a given (S 1 +S 2 )/S 0
It shows the variation in sensitivity to a ±50% change in . Note that there is no practical problem if the variation in sensitivity is ±1 dB for a ±50% change in S 0 .
なお背気室のスチフネスを大きくするために、
背気室の容積を小さくすると、感度に及ぼす影響
が懸念されるが、背気室を１cm3とした場合、寸法
公差を1/10mmと見積つても感度変化は0.2dBに抑
えることができるものである。 In order to increase the stiffness of the back air chamber,
There is concern that reducing the volume of the back air chamber will affect sensitivity, but if the back air chamber is 1 cm 3 and the dimensional tolerance is estimated to be 1/10 mm, the change in sensitivity can be suppressed to 0.2 dB. It is.
第１図において、破線で示すｍは孔１１の質
量、γは孔１１の音響抵抗であり、本考案のよう
に、外筐体８に孔１１を形成することにより、上
記質量ｍ、音響抵抗γが付加されることになり、
このために第４図に示すように低域の感度を向上
することができ、例え実耳とイヤピースとの間に
間隙が生じても低域感度が低下することはないも
のである。 In FIG. 1, m shown by a broken line is the mass of the hole 11, and γ is the acoustic resistance of the hole 11. By forming the hole 11 in the outer casing 8 as in the present invention, the mass m, the acoustic resistance γ will be added,
For this reason, as shown in FIG. 4, the low frequency sensitivity can be improved, and even if a gap is created between the real ear and the earpiece, the low frequency sensitivity will not decrease.
本考案は上記のような構成であり、実耳、イヤ
ピース間のリークによる通話品質の低下を防止で
きる利点を有するものである。 The present invention has the above-described structure, and has the advantage of being able to prevent deterioration in call quality due to leakage between the real ear and the earpiece.
第１図は受話器の等価回路図、第２図は本考案
の一実施例における受話器の断面図、第３図は同
受話器の感度偏差を示す図、第４図は同受話器の
周波数特性図である。
１……磁石、２……溝、３……内筐体、４……
制動素子、５……振動板、６……ボビン、７……
ボイスコイル、８……外筐体、９……イヤピー
ス、１０……孔、１１……孔、……前気室、
……第１背気室、……第２背気室。
Fig. 1 is an equivalent circuit diagram of the receiver, Fig. 2 is a cross-sectional view of the receiver in an embodiment of the present invention, Fig. 3 is a diagram showing the sensitivity deviation of the receiver, and Fig. 4 is a frequency characteristic diagram of the receiver. be. 1... Magnet, 2... Groove, 3... Inner casing, 4...
Braking element, 5... diaphragm, 6... bobbin, 7...
Voice coil, 8... Outer housing, 9... Earpiece, 10... Hole, 11... Hole,... Front air chamber,
...First back air chamber, ...Second back air chamber.
Claims (1)
電型変換器を収納し、上記動電型変換器の振動板
の背部に形成される背気室の合成スチフネスと音
響負荷のスチフネスとの和を、上記動電型変換器
の振動板の等価スチフネスより大きくするととも
に、上記外筐体に外部と連通する孔を形成してな
る受話器。 An electrodynamic transducer is housed in an outer casing with an earpiece provided in the opening, and the sum of the composite stiffness of the back air chamber formed at the back of the diaphragm of the electrodynamic transducer and the stiffness of the acoustic load is measured. is larger than the equivalent stiffness of the diaphragm of the electrodynamic transducer, and the outer casing has a hole communicating with the outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4368182U JPS58147379U (en) | 1982-03-26 | 1982-03-26 | telephone receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4368182U JPS58147379U (en) | 1982-03-26 | 1982-03-26 | telephone receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58147379U JPS58147379U (en) | 1983-10-04 |
| JPS6314552Y2 true JPS6314552Y2 (en) | 1988-04-22 |
Family
ID=30054761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4368182U Granted JPS58147379U (en) | 1982-03-26 | 1982-03-26 | telephone receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58147379U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009284169A (en) * | 2008-05-21 | 2009-12-03 | Audio Technica Corp | Headphone |
-
1982
- 1982-03-26 JP JP4368182U patent/JPS58147379U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58147379U (en) | 1983-10-04 |
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