JPH0472439B2 - - Google Patents
Info
- Publication number
- JPH0472439B2 JPH0472439B2 JP56206362A JP20636281A JPH0472439B2 JP H0472439 B2 JPH0472439 B2 JP H0472439B2 JP 56206362 A JP56206362 A JP 56206362A JP 20636281 A JP20636281 A JP 20636281A JP H0472439 B2 JPH0472439 B2 JP H0472439B2
- Authority
- JP
- Japan
- Prior art keywords
- coil
- voice coil
- center
- bobbin
- coil bobbin
- 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 - Lifetime
Links
- 239000004020 conductor Substances 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/046—Construction
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Description
【発明の詳細な説明】
本発明はダイナミツクスピーカのボイスコイル
に関する。ダイナミツクスピーカに於いてはボイ
スコイルに供給される電流の大きさに応じて振動
板が偏位（振動）することが望ましい。しかしな
がらこの振動板の遍位はボイスコイルに流れる電
流の大きさに必ずしも比例しない。即ち、大電流
がコイルに供給されて振動板が大きく振動する場
合には、その遍位が飽和に近ずき、非直線性を示
すようになる。これは振動板がダンパー又はエツ
ヂ等の支持系により支持されているからであり、
更に振動板それ自体の変形等にも起因するからで
ある。更にボイスコイルは磁気空隙内で共振周波
数f0又はその近傍或はそれ以下の周波数帯域の大
振幅では磁気空隙から大きくはみ出し、一様な磁
束密度Ｂ中での長さのボイスコイル中に流れる
電流ｉに加わる力ｆ＝Ｂｉは全周期に亘つて
歪、この様な出力音圧に第３次高周波歪を生ずる
欠点がある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a voice coil for a dynamic speaker. In a dynamic speaker, it is desirable that the diaphragm deflect (vibrate) depending on the magnitude of the current supplied to the voice coil. However, this displacement of the diaphragm is not necessarily proportional to the magnitude of the current flowing through the voice coil. That is, when a large current is supplied to the coil and the diaphragm vibrates greatly, its displacement approaches saturation and exhibits nonlinearity. This is because the diaphragm is supported by a support system such as a damper or edge.
This is also due to deformation of the diaphragm itself. Furthermore, the voice coil protrudes largely from the magnetic air gap at large amplitudes in the resonance frequency f0 , its vicinity, or lower frequency range, and the current flowing in the voice coil of length at a uniform magnetic flux density B. The force f=Bi applied to i is distorted over the entire cycle, and has the drawback of producing third-order high-frequency distortion in the output sound pressure.
このような欠点を回避するために従来、第１図
に示す構成が考えられている。図について説明す
ると、１はセンターポール、２は環状のプレート
であつて、この両者間に於いて磁気空隙が形成さ
れている。３はこの磁気空隙内に配置されたコイ
ルボビン、４はこれに巻装されたボイスコイルで
ある。５は振動板を示す。そしてボイスコイル４
を第１図により明らかなように、コイルボビン３
の軸線３ａの方向に関してコイル４の巻装部分の
中央付近に於いては粗に巻き、両端部側に向うに
従つて密に巻くものである。この場合は、ボイス
コイル４の線材の断面はその全長に亘つて等しい
ものを使用することができる。 In order to avoid such drawbacks, a configuration shown in FIG. 1 has been conventionally considered. To explain the figures, 1 is a center pole, 2 is an annular plate, and a magnetic gap is formed between them. 3 is a coil bobbin disposed within this magnetic gap, and 4 is a voice coil wound around the coil bobbin. 5 indicates a diaphragm. and voice coil 4
As is clear from Fig. 1, the coil bobbin 3
With respect to the direction of the axis 3a of the coil 4, the winding portion of the coil 4 is wound loosely near the center, and is wound more densely toward both ends. In this case, the cross section of the wire of the voice coil 4 can be the same over its entire length.
このようにボイスコイル４の両端に於いてその
中央部に比して密に巻装することによつて、上述
した非直線性による歪の生ずるのをほぼ回避する
ことができることは周知のところである。しかし
乍らこのようにコイル４を巻装することは極めて
困難であり、且つ長期に亘つてこの状態を保持さ
せることの信頼性も乏しい。更に、コイル４を２
層又は３層に巻装することは困難となる。 It is well known that by winding the voice coil 4 more densely at both ends than at the center, the distortion caused by the nonlinearity described above can be largely avoided. . However, it is extremely difficult to wind the coil 4 in this manner, and the reliability of maintaining this state over a long period of time is also poor. Furthermore, coil 4 is
Wrapping in layers or three layers becomes difficult.
第２図の例では、コイルボビン３の軸線３ａの
延長方向に関してその中央部分の線材の断面積を
大きくし、外側に向うに従つて線材の断面積を小
さく形成した場合である。これにより実質的に電
流密度は外側に於いてその中央部分より密になる
ので、第１図の場合と同様の目的を達成すること
ができる。しかしながらこの例では、線材の直径
をコイルの両端と中央部とに於いて異ならせる必
要があるために、連続した断面積の異なる線材を
得ようとする場合にはダイスの直径を連続的に変
えなければならずその製作が困難で実際的でない
欠点がある。 In the example shown in FIG. 2, the cross-sectional area of the wire at the center of the coil bobbin 3 is increased in the direction of extension of the axis 3a of the coil bobbin 3, and the cross-sectional area of the wire is decreased toward the outside. As a result, the current density is substantially denser on the outside than in the center, so that the same objective as in FIG. 1 can be achieved. However, in this example, the diameter of the wire needs to be different at both ends and the center of the coil, so if you want to obtain wire with continuous different cross-sectional areas, you can change the diameter of the die continuously. However, it has the disadvantage that it is difficult to manufacture and impractical.
本発明は第１図及び第２図に示す如き欠点を回
避しながら、更に上記目的を容易に達成できるよ
うに考慮したものであつて、第３図以下について
説明する。なお、本図に於いて第１図及び第２図
との対応部分には同一符号を付してその説明を省
略する。 The present invention is designed to easily achieve the above object while avoiding the drawbacks shown in FIGS. 1 and 2, and will be described below with reference to FIG. 3. In this figure, parts corresponding to those in FIGS. 1 and 2 are given the same reference numerals, and their explanations will be omitted.
本発明に於いて第２図に示したと同等の効果を
得るためにボイスコイル４の線材として第３図に
示すように、いわゆる平角導体を使用するもので
ある。そしてこの場合、コイル４の断面積を一定
にし、その厚み即ちコイルボビン３の軸線３ａ方
向に関する長さを、コイルボビン３の端部側に向
うに従つて薄くなるように選んだものである。 In the present invention, in order to obtain the same effect as shown in FIG. 2, a so-called rectangular conductor is used as the wire of the voice coil 4, as shown in FIG. In this case, the cross-sectional area of the coil 4 is kept constant, and its thickness, ie, the length in the direction of the axis 3a of the coil bobbin 3, is selected so that it becomes thinner toward the end of the coil bobbin 3.
このようなコイル４は次のような方法により容
易に作ることができる。即ち第４図Ａに示す如き
従来周知の断面円形の導体を用意し、これを図示
しないが相対向して配置された１対のローラをも
つて圧延し、第４図Ｂに示すように扁平、即ち厚
みの小なる線材を作る。このとき１対の圧着ロー
ラの圧力を徐々に弱めることによつて第４図Ｃに
示す如き厚みの比較的大きな部分も構成すること
ができ、更に１対のローラの圧力を高めていくこ
とに従つて、再び第４図Ｂに示す厚みの小さな部
分も作ることができる。 Such a coil 4 can be easily made by the following method. That is, a conventionally known conductor with a circular cross section as shown in FIG. 4A is prepared, and this is rolled with a pair of rollers (not shown) disposed opposite each other to flatten it as shown in FIG. 4B. In other words, a wire rod with a small thickness is made. At this time, by gradually weakening the pressure of the pair of pressure rollers, a relatively thick portion as shown in FIG. 4C can be formed, and by further increasing the pressure of the pair of rollers. Therefore, it is also possible to produce a portion with a small thickness as shown in FIG. 4B again.
即ち本発明では第４図Ａに示す如き円形線材を
用意してこれを１対の圧着ローラに通す場合にそ
の押圧力と線材引張り力を適当に調整することに
よつて、第３図に示すコイル４を連続的に得るこ
とが可能となるものである。よつてこのコイル４
の断面積は各部分について同一のものとなつてい
る。 That is, in the present invention, when a circular wire rod as shown in FIG. 4A is prepared and passed through a pair of pressure rollers, the pressing force and the wire tension force are appropriately adjusted, so that the circular wire rod as shown in FIG. 3A is prepared. This makes it possible to obtain the coil 4 continuously. Yotsutoko coil 4
The cross-sectional area of is the same for each part.
上述した本発明によるダイナミツクスピーカに
よれば、コイル４の厚みがコイル４の外側に向つ
て小さく形成されているために、ボビン３の軸線
３ａ方向に関してみると単位巻回当りのコイルの
厚みは中央付近が大きく外側に向つて次第に薄く
なるのである。依つて、この第３図の模式図は第
５図の様に示すことが出来る。即ち、ボイスコイ
ル４の中央と外周部では電流密度は一定であるが
単位領域６ａ，６ｂ，６ｃ内で電流ｉが磁束を横
切る量は中央付近６ｃで少く、端部側６ａ，６ａ
で多くなる。依つて、軸線３ａ方向の単位長当り
のボイスコイル４の巻線の長さが大振幅動作領域
では小振幅動作領域よりボイスコイルに加わる力
Ｆ＝Ｂｉが大きくなり、第３次高調波歪を低減
出来るので第１図及び第２図で説明したと同様の
目的を達成することができる。しかも本発明によ
ればコイル４の製造を極めて容易に行うことがで
き、しかも図面よりして明らかなように各コイル
の隣接する部分では互いに密着して巻装すること
ができるので、第１図で説明した場合の如く、不
安定となるおそれが全くない。 According to the above-described dynamic speaker according to the present invention, since the thickness of the coil 4 is formed to be smaller toward the outside of the coil 4, the thickness of the coil per unit turn is as follows in the direction of the axis 3a of the bobbin 3. It is large near the center and gradually becomes thinner toward the outside. Therefore, the schematic diagram in FIG. 3 can be shown as in FIG. 5. That is, although the current density is constant at the center and outer periphery of the voice coil 4, the amount by which the current i crosses the magnetic flux within the unit areas 6a, 6b, 6c is small near the center 6c, and at the end sides 6a, 6a.
It becomes more. Therefore, when the winding length of the voice coil 4 per unit length in the direction of the axis 3a is in a large amplitude operating region, the force F=Bi applied to the voice coil becomes larger than in a small amplitude operating region, causing third harmonic distortion. Since this can be reduced, it is possible to achieve the same objective as explained in FIGS. 1 and 2. Moreover, according to the present invention, the coil 4 can be manufactured very easily, and as is clear from the drawings, adjacent parts of each coil can be wound in close contact with each other. There is no risk of instability as in the case described above.
以上説明したように本発明によるダイナミツク
スピーカによれば、振動板の変形等によつて生ず
る非直線歪が改善され、巻装が容易であつて、ボ
イスコイルとしての空間利用率が大となり、スピ
ーカの能率が向上し、且つ密着巻きができるため
に機械的強度が大である特徴を有するものであ
る。 As explained above, according to the dynamic speaker of the present invention, non-linear distortion caused by deformation of the diaphragm etc. is improved, winding is easy, space utilization efficiency as a voice coil is increased, It is characterized by improved speaker efficiency and high mechanical strength because it can be tightly wound.
第１図及び第２図は従来のダイナミツクスピー
カの一部分の拡大断面図、第３図は本発明による
ダイナミツクスピーカの一部分の拡大断面図、第
４図は製造過程を説明する線材の断面図、第５図
は第３図の模式図である。
１はセンターポール、２は環状のプレート、３
はコイルボビン、４はボイスコイル、５は振動板
である。
1 and 2 are enlarged sectional views of a portion of a conventional dynamic speaker, FIG. 3 is an enlarged sectional view of a portion of a dynamic speaker according to the present invention, and FIG. 4 is a sectional view of a wire rod explaining the manufacturing process. , FIG. 5 is a schematic diagram of FIG. 3. 1 is the center pole, 2 is the annular plate, 3
is a coil bobbin, 4 is a voice coil, and 5 is a diaphragm.
Claims (1)
コイルと、該ボイスコイルの各々の巻線が互いに
密着された状態で巻装されたコイルボビンとを備
え、 上記コイルボビンの軸線方向の一端側から他端
側に向かつて上記平角導体のボイスコイルを断面
積が一定のまま巻回するとともに、上記平角導体
のボイスコイルの厚みが上記コイルボビンの軸線
方向の中央部から両端側に向かうに従つて連続的
に小さくなるように形成したことを特徴とするダ
イナミツクスピーカ。[Claims] 1. A voice coil formed of a flat rectangular conductor with a constant cross-sectional area, and a coil bobbin in which each winding of the voice coil is wound in close contact with each other, the axis of the coil bobbin The voice coil of the rectangular conductor is wound with a constant cross-sectional area from one end of the coil bobbin to the other end, and the thickness of the voice coil of the rectangular conductor changes from the center of the coil bobbin in the axial direction to both ends. A dynamic speaker characterized in that it is formed so as to become continuously smaller toward the other end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20636281A JPS58106997A (en) | 1981-12-21 | 1981-12-21 | Dynamic speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20636281A JPS58106997A (en) | 1981-12-21 | 1981-12-21 | Dynamic speaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58106997A JPS58106997A (en) | 1983-06-25 |
| JPH0472439B2 true JPH0472439B2 (en) | 1992-11-18 |
Family
ID=16522060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20636281A Granted JPS58106997A (en) | 1981-12-21 | 1981-12-21 | Dynamic speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58106997A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6023929U (en) * | 1983-07-22 | 1985-02-19 | アルプス電気株式会社 | magnetic drive device |
| JPS60212100A (en) * | 1984-04-06 | 1985-10-24 | Matsushita Electric Ind Co Ltd | Digital speaker |
| JPS62141898A (en) * | 1985-12-16 | 1987-06-25 | Matsushita Electric Ind Co Ltd | Speaker voice coil |
| JPH02103740A (en) * | 1989-07-27 | 1990-04-16 | Alps Electric Co Ltd | Manufacture of driving coil |
| JP4134428B2 (en) * | 1999-03-16 | 2008-08-20 | 松下電器産業株式会社 | Speaker |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56107698A (en) * | 1980-01-30 | 1981-08-26 | Matsushita Electric Ind Co Ltd | Dynamic loudspeaker |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5696796U (en) * | 1979-12-24 | 1981-07-31 |
-
1981
- 1981-12-21 JP JP20636281A patent/JPS58106997A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56107698A (en) * | 1980-01-30 | 1981-08-26 | Matsushita Electric Ind Co Ltd | Dynamic loudspeaker |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58106997A (en) | 1983-06-25 |
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