JPS5870700A - speaker - Google Patents

speaker

Info

Publication number
JPS5870700A
JPS5870700A JP56168731A JP16873181A JPS5870700A JP S5870700 A JPS5870700 A JP S5870700A JP 56168731 A JP56168731 A JP 56168731A JP 16873181 A JP16873181 A JP 16873181A JP S5870700 A JPS5870700 A JP S5870700A
Authority
JP
Japan
Prior art keywords
voice coil
coil
voice
output
signal
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
JP56168731A
Other languages
Japanese (ja)
Inventor
Koshin Shimada
島田　康臣
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 JP56168731A priority Critical patent/JPS5870700A/en
Publication of JPS5870700A publication Critical patent/JPS5870700A/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; 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)

Abstract

PURPOSE:To reduce the distortion factor at large amplitude, by detecting the vibration of a voice bobbin through the provision of a control coil at the upper and lower side of a voice coil and feeding back this detection signal to the control coil via an amplifier. CONSTITUTION:Control voice coils 8, 9 are provided at both sides of a voice coil 3. A detector 10 is fixed to a voice coil bobbin 1 to output a signal proportional to the vibration of the voice coil bobbin. The output of the sensor 10 and an input signal to the voice coil 3 are differentially amplified and power-amplified to be fed back to the coils 8, 9. Thus, when the coil 3 moves outside a top plate 4, magnetic flux through the voice coil 3 is decreased and the driving force is lowered, the output of the sensor 10 is lowered, and a signal proportional to the decrement of the driving force is generated at the output of the differential amplifier outputting the difference with the input signal to the coil 3, a signal is given to the coils 8, 9, allowing to decrease the distortion factor at large amplitude.

Description

【発明の詳細な説明】[Detailed description of the invention]

本発明ハ、スピーカに関しボイスコイルが大振幅振動を
しても駆動力が低下しないようにすることを目的とする
ものである。 従来、上記目的を達成するために、第１図に示すように
磁気ギャップにおけるトッププレート４の厚みより長い
寸法の巻幅を持つロングボイスコイル３が採用されてい
たが、ボイスコイルの駆動力として有効なボイスコイル
の幅は、トッププレートト れる電流のうちトッププレートから離れる部分（ｄ力を
発生しないので効率が大変低いという問題カニあった。 以下に本発明の一実施例を図面と共に説明する。 なお第１図と同一参照数字は同一内容を表わす。 第２図に示すようにボイスコイル３の両側ＶＣ　ｆｔｉ
ｌｉ御用ボイスコイル８，９を設ける。検出器］０肩１
、ボイスコイルボビンC. An object of the present invention is to prevent the driving force from decreasing even when the voice coil of a speaker vibrates with large amplitude. Conventionally, in order to achieve the above purpose, a long voice coil 3 having a winding width longer than the thickness of the top plate 4 in the magnetic gap, as shown in Fig. 1, has been adopted. The effective width of the voice coil is determined by the portion of the top plate current that is away from the top plate (D force is not generated, so there is a problem that the efficiency is very low. An embodiment of the present invention will be explained below with reference to the drawings. Note that the same reference numerals as in Fig. 1 represent the same contents.As shown in Fig. 2, both sides of the voice coil 3 have VC fti
Voice coils 8 and 9 for li use are provided. Detector] 0 shoulder 1
, voice coil bobbin

【に固着され、ボイスコイルボビ
ンの振動に比例した信号を出力するセンサーで、圧電素
子や半導体素子を応用したもので加速度を検出したり一
゛、静電、光電素子などで振幅を検出してもよい。 本発明のブロックダイアグラムを第３図に示すように、
・（ワー増幅器１１の出力信号を７Ｆ．゛イスコイル３
に入力し、上記センサーＩＯの出力とボイスコイル３の
入力信号を差動−増幅器１３に入力１７、・くワー増幅
器１４を通して、上記制御用ボイスコイル８、つに帰還
することによって、ボイスボビン１の振動が大振幅にな
ってボイスコイル３カドツブグレート４の外体に移動し
、ボイスコイル３を通る磁束が低下して１．駆動力が低
下すると、センサー１０の出力が低下しボイスコイル３
の入力信号との差分を出力する差動増幅器１３の出力て
駆動力の低下分に比例した信号が発生し、制御用ボイス
コイル８，９に信号が流れ、この時、制御用ボイス′：
１イル８又は９は、トッププレートの有効磁束内にある
ので、効率よく制御さｈて、制御電流は少なくても十分
効果を上げることができる。 まだセンサ出力疋任意のイコライザを挿入することによ
ってボイスコイルの振動周波数を任意に設定できる。 以上のように本発明によれば、ロングボイスコイノーで
も従来のように効率を下けることなく大振幅口ｊの歪を
低下できると共に、パワー増幅器になん１・手を加える
ことなく、モー７ヨナルフイードバ、りが行なえるので
、任意の周波数特性をもつ、ドライバーを提供できるも
のである。 第１図は従来のスピーカ断面図、第２図は本発明による
スピーカ断面図、第３図は不発１＋ｑによるスピーカシ
ステムのブロックダ１アゲラムである。 】　・・山・・・・ボイスコイルボビン、　２・・・・
・・山タンパ、３　・・・・川・ボイスコイル、　４　
°゛°・・・・　トッププレート、５　　°“マグネッ
ト、　６　・・・・・・・バックプレート、７・・・・
・・・・センタポール、８，９　・・・・・・制御　Ｊ
ＴＪボイス＝ｌイル、１ｏ・・曲［１＋センサー、Ｎ、
１４・・・・・電力増幅器、　１２・・・・・・・・　
ドライバー、１：３・・・・・・・・・差動増幅器。 特許出願人　松下電器産業−５式会社 第１図 「 第３図 １A sensor that outputs a signal proportional to the vibration of the voice coil bobbin.It can detect acceleration using a piezoelectric element or semiconductor element, or detect amplitude using an electrostatic or photoelectric element. good. As the block diagram of the present invention is shown in FIG.
・(The output signal of the power amplifier 11 is connected to the 7F.
The output of the sensor IO and the input signal of the voice coil 3 are fed back to the control voice coil 8 through the differential amplifier 13, the input 17, and the hower amplifier 14, thereby controlling the voice bobbin 1. The vibration becomes large in amplitude and moves to the outer body of the voice coil 3 quadrant grate 4, and the magnetic flux passing through the voice coil 3 decreases, causing 1. When the driving force decreases, the output of the sensor 10 decreases and the voice coil 3
A signal proportional to the drop in driving force is generated at the output of the differential amplifier 13 which outputs the difference between the input signal and the input signal, and a signal flows to the control voice coils 8 and 9. At this time, the control voice ':
Since the coil 8 or 9 is within the effective magnetic flux of the top plate, it can be efficiently controlled and the effect can be sufficiently increased even with a small control current. However, by inserting an arbitrary equalizer into the sensor output, the vibration frequency of the voice coil can be set arbitrarily. As described above, according to the present invention, it is possible to reduce the distortion of the large-amplitude aperture j even in the case of a long-voiced Kohino without reducing the efficiency as in the conventional case, and it is also possible to reduce the distortion of the large-amplitude aperture j without making any changes to the power amplifier. Since it is possible to perform lateral feedback, it is possible to provide a driver with arbitrary frequency characteristics. FIG. 1 is a sectional view of a conventional speaker, FIG. 2 is a sectional view of a speaker according to the present invention, and FIG. 3 is a block diagram of a speaker system based on a misfire 1+q. ] ...Mountain...Voice coil bobbin, 2...
...Mountain Tampa, 3 ...River Voice Coil, 4
°゛°・・・Top plate, 5 °“Magnet, 6...Back plate, 7...
...center pole, 8,9 ...control J
TJ voice = lil, 1o... song [1+sensor, N,
14...Power amplifier, 12......
Driver, 1:3...Differential amplifier. Patent Applicant Matsushita Electric Industrial - Type 5 Company Figure 1 "Figure 3 1

Claims (1)

【特許請求の範囲】[Claims] トッププレートとセンタボール及びマグネットによって
構成された界磁装置において、トッププレートとセンタ
ボールが向い合った磁気ギャップにボイスコイルを設け
、上記ボイス・コイルの振動方向上において、上記ボイ
スコイルの一ヒ側及び下側に制御コイルを設けると共に
、ボイスボビ／の振動を検出する検出器を設け、検出信
号を、上記制御コイルに増幅器を介して帰還したことを
特徴とするスピーカ。In a field device composed of a top plate, a center ball, and a magnet, a voice coil is provided in a magnetic gap where the top plate and center ball face each other, and one side of the voice coil is disposed in the direction of vibration of the voice coil. A speaker characterized in that a control coil is provided on the lower side of the speaker, a detector is provided for detecting vibrations of the voice coil, and a detection signal is fed back to the control coil via an amplifier.
JP56168731A 1981-10-23 1981-10-23 speaker Pending JPS5870700A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56168731A JPS5870700A (en) 1981-10-23 1981-10-23 speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56168731A JPS5870700A (en) 1981-10-23 1981-10-23 speaker

Publications (1)

Publication Number Publication Date
JPS5870700A true JPS5870700A (en) 1983-04-27

Family

ID=15873369

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56168731A Pending JPS5870700A (en) 1981-10-23 1981-10-23 speaker

Country Status (1)

Country Link
JP (1) JPS5870700A (en)

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