JPH0452676B2 - - Google Patents
Info
- Publication number
- JPH0452676B2 JPH0452676B2 JP57201342A JP20134282A JPH0452676B2 JP H0452676 B2 JPH0452676 B2 JP H0452676B2 JP 57201342 A JP57201342 A JP 57201342A JP 20134282 A JP20134282 A JP 20134282A JP H0452676 B2 JPH0452676 B2 JP H0452676B2
- Authority
- JP
- Japan
- Prior art keywords
- coil
- voice coil
- sensor coil
- magnetic flux
- sensor
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers
- H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 この発明はスピーカに関するものである。[Detailed description of the invention] Industrial applications This invention relates to a speaker.
従来例の構成とその問題点
従来、スピーカのボイスコイルの速度を検出す
るため、第１図に示すようにボイスコイルボビン
９を延長した先端にセンサコイル１３を巻回し、
プレート１２とヨーク１０によつて構成される磁
気ギヤツプ中の直流磁束を横切るセンサコイル１
３の出力端子電圧をボイスコイル８の速度信号と
して制御に利用していた。ところが、センサコイ
ル１３をボイスコイル８の近傍に置くと、ボイス
コイル８から誘起している磁束の影響やボイスコ
イル８の磁気回路における交流磁束によつて、セ
ンサコイル１３の出力信号の中にボイスコイル８
の速度成分以外の高調波歪成分が含まれ、ボイス
コイル８の正確な速度が検出できないという問題
があつた。そのため、センサコイル１３はボイス
コイル８の近傍に配置できないので、センサコイ
ル１３の感度を上げるためにマグネツト１１を使
つた磁気回路を構成し、大形化およびコスト高に
なつていた。Conventional Structure and Problems Conventionally, in order to detect the speed of the voice coil of a speaker, a sensor coil 13 is wound around the extended end of a voice coil bobbin 9 as shown in FIG.
A sensor coil 1 crosses the DC magnetic flux in a magnetic gap constituted by a plate 12 and a yoke 10.
The output terminal voltage of the voice coil 8 was used as a speed signal for control. However, if the sensor coil 13 is placed near the voice coil 8, the voice will be included in the output signal of the sensor coil 13 due to the influence of the magnetic flux induced from the voice coil 8 and the alternating magnetic flux in the magnetic circuit of the voice coil 8. coil 8
There was a problem in that the accurate speed of the voice coil 8 could not be detected because harmonic distortion components other than the speed component were included. Therefore, since the sensor coil 13 cannot be placed near the voice coil 8, a magnetic circuit using the magnet 11 is constructed to increase the sensitivity of the sensor coil 13, resulting in an increase in size and cost.
発明の目的
この発明の目的は、小形かつ安価な手段により
ボイスコイルの振動速度に正確に比例した信号を
検出し、スピーカの制御等に役立てることができ
るスピーカを提供することである。OBJECTS OF THE INVENTION It is an object of the present invention to provide a speaker that can detect a signal that is accurately proportional to the vibration speed of a voice coil using small and inexpensive means, and that can be used to control the speaker.
発明の構成
この発明のスピーカは、ボイスコイルを巻回し
たボイスコイルボビンと、このボイスコイルボビ
ンを駆動する磁気回路と、前記ボイスコイルボビ
ンのボイスコイル以外の部分に巻回されて前記磁
気回路の漏れ磁束を横切る磁束の変化分を検出す
るセンサコイルと、このセンサコイルの振動方向
の両端に設けられて前記センサコイルを横切る交
流磁束を検出する補正用サーチコイルと、前記ボ
イスコイルを駆動する駆動回路と、前記センサコ
イルに発生する振動速度に比例した信号と前記補
正用リサーチコイルに発生する検出信号とを掛け
算する掛算器を有して振動系の速度に正確に比例
した出力信号を出力するとともに前記出力信号を
前記駆動回路に帰還する演算回路とを備えたもの
である。Structure of the Invention The speaker of the present invention includes a voice coil bobbin around which a voice coil is wound, a magnetic circuit that drives the voice coil bobbin, and a magnetic circuit that is wound around a portion of the voice coil bobbin other than the voice coil to reduce leakage magnetic flux of the magnetic circuit. a sensor coil that detects a change in the magnetic flux that crosses the sensor coil; a correction search coil that is provided at both ends of the sensor coil in the vibration direction and detects the alternating current magnetic flux that crosses the sensor coil; and a drive circuit that drives the voice coil; A multiplier that multiplies a signal proportional to the vibration speed generated in the sensor coil by a detection signal generated in the correction research coil, and outputs an output signal accurately proportional to the speed of the vibration system, and outputs the output signal. and an arithmetic circuit that feeds back a signal to the drive circuit.
この発明の構成によれば、センサコイルの信号
と補正用サーチコイルの信号とを演算回路により
掛け算して、振動系の速度に正確に比例した出力
信号を出力し、ボイスコイルの駆動回路に帰還す
るようにしたため、従来のようにセンサコイルに
マグネツトを使用する必要がなく、センサーコイ
ルおよび補正用サーチコイルをボイスコイルボビ
ンの磁気回路に共用できるので、構造が簡単で小
形かつ安価にできる。また別に磁気回路に帰還コ
イルを設けてボイスコイルの駆動を制御するもの
（たとえば特開昭54−089618号）と比較して消費
電力が少ない。 According to the configuration of the present invention, the signal of the sensor coil and the signal of the correction search coil are multiplied by the arithmetic circuit to output an output signal accurately proportional to the speed of the vibration system, and the output signal is fed back to the voice coil drive circuit. Therefore, there is no need to use a magnet for the sensor coil as in the conventional case, and the sensor coil and the correction search coil can be used in common for the magnetic circuit of the voice coil bobbin, so the structure can be made simple, compact, and inexpensive. Furthermore, the power consumption is lower than that of a system in which a feedback coil is separately provided in the magnetic circuit to control the drive of the voice coil (for example, Japanese Patent Application Laid-Open No. 54-089618).
実施例の説明
この発明の一実施例を第２図ないし第５図に示
す。すなわち、第２図のようにセンサコイル１３
の上端および下端にサーチコイル１４，１５を設
け、センサコイル１３の振動方向以外に出入りす
る磁束φ3を検出する。このとき上端サーチコイ
ル１４と下端サーチコイル１５の信号が引算され
るように逆巻きすると、第５図のようにセンサコ
イル１３をボイスコイル８の近傍に近ずけても第
３図の演算回路の出力信号は常に一定のBl積
（Ｂは磁束密度、ｌはセンサコイル１３の有効長）
になるように動作し、センサコイル１３の外部か
ら出入りする交流磁束の影響を受けることがなく
なる。DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention is shown in FIGS. 2 to 5. That is, as shown in FIG.
Search coils 14 and 15 are provided at the upper and lower ends of the sensor coil 13 to detect magnetic flux φ 3 that enters and exits in a direction other than the vibration direction of the sensor coil 13. At this time, if the signals of the upper end search coil 14 and the lower end search coil 15 are reversely wound so that they are subtracted, even if the sensor coil 13 is brought close to the voice coil 8 as shown in FIG. The output signal is always a constant Bl product (B is the magnetic flux density, l is the effective length of the sensor coil 13)
The sensor coil 13 operates in such a manner that it is not affected by alternating current magnetic flux flowing in and out from the outside of the sensor coil 13.
詳述すると、第５図において１′，３′は各々プ
レート１およびヨーク３を延長してボイスコイル
８のある磁気ギヤツプの漏れ磁束をセンサコイル
１３のある部分に集中させるための磁気回路用突
出部である。２はマグネツト、４はフレーム、５
はエツジ、６は振動板、７はダンパ、９はボイス
コイルボビン、２４はダストキヤツプである。さ
て、サーチコイル１４，１５は各々センサコイル
１３の上端および下端を出入りする磁束φ1，φ2
を検出し、サーチコイル１４，１５の信号を引算
すると、
Δe＝dφ3／dt＝ｄ（φ1−φ2）／dt ……(1)
なる電圧が得られる。 Specifically, in FIG. 5, 1' and 3' are magnetic circuit protrusions for extending the plate 1 and yoke 3, respectively, and concentrating the leakage magnetic flux of the magnetic gap where the voice coil 8 is located on a certain part of the sensor coil 13. Department. 2 is magnet, 4 is frame, 5
6 is an edge, 6 is a diaphragm, 7 is a damper, 9 is a voice coil bobbin, and 24 is a dust cap. Now, the search coils 14 and 15 receive magnetic fluxes φ 1 and φ 2 that enter and exit the upper and lower ends of the sensor coil 13, respectively.
is detected and the signals of the search coils 14 and 15 are subtracted, a voltage of Δ e =dφ 3 /dt=d(φ 1 −φ 2 )/dt (1) is obtained.
一方、センサコイル１３の両端に発生する電圧
ｅは
ｅ＝Blv ……(2)
となる。ここで、ｖはボイスコイル８の振動速度
である。しかし実際には前述のように、センサコ
イル１３の磁束密度Ｂは振動方向に対して非対称
であり、またボイスコイル８からの磁束の影響を
受けて歪んでいる。そこでその歪成分をΔBlとす
ると、前記式(2)は
ｅ＝Blv＋ΔBlv ……(3)
となり、ΔBlは前述のセンサコイル１３を横切る
磁束φ3を積分したものに相当する。 On the other hand, the voltage e generated across the sensor coil 13 is as follows: e=Blv (2). Here, v is the vibration speed of the voice coil 8. However, in reality, as described above, the magnetic flux density B of the sensor coil 13 is asymmetrical with respect to the vibration direction, and is also distorted under the influence of the magnetic flux from the voice coil 8. Therefore, if the distortion component is ΔBl, the above equation (2) becomes e=Blv+ΔBlv (3), where ΔBl corresponds to the integral of the magnetic flux φ 3 that crosses the sensor coil 13 described above.
したがつて、積分器（第４図の２３）の出力に
は
es＝∫Δedt＝∫dΔBl／dt＝ΔBl ……(4)
なる信号が得られる。 Therefore, a signal as follows is obtained at the output of the integrator (23 in FIG. 4): e s =∫Δedt=∫dΔBl/dt=ΔBl (4).
このようにして得られた電圧ｅ、esを第３図に
示す演算回路を通すとBlvなる無歪の速度成分が
検出できる。すなわち、１６，１９は引算器、１
７は掛算器、１８はＫ倍の利得をもつ増幅器であ
る。 When the voltages e and e s thus obtained are passed through the arithmetic circuit shown in FIG. 3, a distortion-free velocity component called Blv can be detected. That is, 16 and 19 are subtractors, 1
7 is a multiplier, and 18 is an amplifier with a gain of K times.
ｅ＝ｖ（Bl＋ΔBl）es＝ΔBlなる電圧を印加する
と１８の出力ep′は
（ｅ−ep′）×es×Ｋ＝ep′ ……(5)
∴ep′＝ｅ／１＋１／esＫ＝ｖ（Bl＋ΔBl）／１＋１／
ΔBlK……(6)
Ｋ＝１／Blになるように増幅器１８の利得を調整
すると、
ep′＝ｖ（Bl＋ΔBl）／ΔBl＋Bl・ΔBl
＝ΔBlv ……(7)
したがつて、引算器１９の出力epは
ep＝ｖ（Bl＋ΔBl）−ΔBlv Blv ……(8)
この信号epはスピーカの振動速度ｖに定数Bl倍
しただけの信号であるから、これによりスピーカ
の速度、振幅、加速度などを制御することができ
る。When a voltage of e=v(Bl+ΔBl)e s =ΔBl is applied, the output e p ′ of 18 is (e−e p ′)×e s ×K=e p ′ ……(5) ∴e p ′=e/ 1+1/e s K=v(Bl+ΔBl)/1+1/
ΔBlK...(6) When the gain of the amplifier 18 is adjusted so that K=1/Bl, e p ′=v(Bl+ΔBl)/ΔBl+Bl・ΔBl=ΔBlv...(7) Therefore, the subtracter 19 The output e p is e p = v (Bl + ΔBl) − ΔBlv Blv ... (8) Since this signal e p is just the vibration speed v of the speaker multiplied by a constant Bl, this causes the speaker speed, amplitude, Acceleration, etc. can be controlled.
第４図は第３図の演算回路を使用して速度帰還
した場合の実施例であり、センサコイルＢの信号
を前記増幅器２２で受け、サーチコイル１４，１
５の信号を引算して積分器２３を介して各々を演
算回路に入力し、演算回路出力をボイスコイル８
の駆動回路の電力増幅器２０にフイードバツクし
てスピーカ２１のボイスコイルの速度特性を制御
している。なお、前記演算回路出力は速度信号で
あるからこれを積分、微分して各々振幅、加速度
帰還したりその他のフイードホワード制御に使え
ることはもちろんである。 FIG. 4 shows an embodiment in which speed feedback is performed using the arithmetic circuit shown in FIG.
5 are subtracted and inputted to the arithmetic circuit via the integrator 23, and the arithmetic circuit output is sent to the voice coil 8.
The speed characteristics of the voice coil of the speaker 21 are controlled by feedback to the power amplifier 20 of the drive circuit. Note that since the output of the arithmetic circuit is a speed signal, it can of course be used for integrating and differentiating the signal and feeding back the amplitude and acceleration, respectively, or for other feedforward control.
発明の効果
以上のように、この発明のスピーカは、センサ
コイルの信号と補正用サーチコイルの信号とを演
算回路により掛け算して、振動系の速度に正確に
比例した出力信号を出力し、ボイスコイルの駆動
回路に帰還するようにしたため、従来のようにセ
ンサコイルにマグネツトを使用する必要がなく、
センサーコイルおよび補正用サーチコイルをボイ
スコイルボビンの磁気回路に共用できるので、構
造が簡単で小形かつ安価にできる。また別に磁気
回路に帰還コイルを設けたもの（たとえば特開昭
54−0896）と比較して消費電力が少なく、したが
つてスピーカの制御に有益であるという効果があ
る。Effects of the Invention As described above, the speaker of the present invention multiplies the signal of the sensor coil and the signal of the correction search coil by the arithmetic circuit, outputs an output signal that is accurately proportional to the speed of the vibration system, and produces a voice. Since the feedback is fed back to the coil drive circuit, there is no need to use a magnet in the sensor coil as in the past.
Since the sensor coil and the correction search coil can be shared in the magnetic circuit of the voice coil bobbin, the structure can be made simple, compact, and inexpensive. In addition, there are other types that have a feedback coil in the magnetic circuit (for example, the
54-0896), it consumes less power and is therefore useful for speaker control.
第１図は従来のスピーカの断面図、第２図はこ
の発明の一実施例のサーチコイルおよびセンサコ
イルの斜視図、第３図は演算回路ブロツク図、第
４図はそのスピーカ制御システムブロツク図、第
５図はこの発明の一実施例のスピーカの断面図で
ある。
１……プレート、３……ヨーク（磁気回路）、
１′……プレート突出部、３′……ヨーク突出部
（漏れ磁束用）、２……マグネツト、８……ボイス
コイル、９……ボイスコイルボビン、１３……セ
ンサコイル、１４，１５……サーチコイル、１
６，１９……引算器、１７……掛算器、１８……
増幅器、２０……駆動回路の電力増幅器、２１…
…スピーカ。
Fig. 1 is a sectional view of a conventional speaker, Fig. 2 is a perspective view of a search coil and a sensor coil according to an embodiment of the present invention, Fig. 3 is a block diagram of an arithmetic circuit, and Fig. 4 is a block diagram of the speaker control system. , FIG. 5 is a sectional view of a speaker according to an embodiment of the present invention. 1...Plate, 3...Yoke (magnetic circuit),
1'...Plate protrusion, 3'...Yoke protrusion (for leakage magnetic flux), 2...Magnet, 8...Voice coil, 9...Voice coil bobbin, 13...Sensor coil, 14, 15...Search coil, 1
6, 19...subtractor, 17...multiplier, 18...
Amplifier, 20... Drive circuit power amplifier, 21...
...Speaker.
Claims (1)
と、このボイスコイルボビンを駆動する磁気回路
と、前記ボイスコイルボビンのボイスコイル以外
の部分に巻回されて前記磁気回路の漏れ磁束を横
切る磁束の変化分を検出するセンサコイルと、こ
のセンサコイルの振動方向の両端に設けられて前
記センサコイルを横切る交流磁束を検出する補正
用サーチコイルと、前記ボイスコイルを駆動する
駆動回路と、前記センサコイルに発生する振動速
度に比例した信号と前記補正用サーチコイルに発
生する検出信号とを掛け算する掛算器を有して振
動系の速度に正確に比例した出力信号を出力する
とともに前記出力信号を前記駆動回路に帰還する
演算回路とを備えたスピーカ。1. A voice coil bobbin around which a voice coil is wound, a magnetic circuit that drives this voice coil bobbin, and a change in magnetic flux that is wound around a portion of the voice coil bobbin other than the voice coil and crosses leakage magnetic flux of the magnetic circuit. A sensor coil, a correction search coil that is provided at both ends of the sensor coil in a vibration direction and detects an alternating current magnetic flux that crosses the sensor coil, a drive circuit that drives the voice coil, and a vibration speed that occurs in the sensor coil. and a multiplier that multiplies a signal proportional to the detection signal generated in the correction search coil to output an output signal accurately proportional to the speed of the vibration system and feed the output signal back to the drive circuit. A speaker equipped with an arithmetic circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57201342A JPS5990497A (en) | 1982-11-15 | 1982-11-15 | Speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57201342A JPS5990497A (en) | 1982-11-15 | 1982-11-15 | Speaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5990497A JPS5990497A (en) | 1984-05-24 |
| JPH0452676B2 true JPH0452676B2 (en) | 1992-08-24 |
Family
ID=16439433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57201342A Granted JPS5990497A (en) | 1982-11-15 | 1982-11-15 | Speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5990497A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110881160B (en) * | 2019-11-12 | 2021-08-31 | 歌尔股份有限公司 | Sound production device |
| GB2620787A (en) * | 2022-07-22 | 2024-01-24 | Gp Acoustics Uk Ltd | Loudspeakers |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6024634B2 (en) * | 1977-12-14 | 1985-06-13 | 松下電器産業株式会社 | speaker system |
-
1982
- 1982-11-15 JP JP57201342A patent/JPS5990497A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5990497A (en) | 1984-05-24 |
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