JP2004007333A - Speaker - Google Patents

Speaker Download PDF

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Publication number
JP2004007333A
JP2004007333A JP2002195507A JP2002195507A JP2004007333A JP 2004007333 A JP2004007333 A JP 2004007333A JP 2002195507 A JP2002195507 A JP 2002195507A JP 2002195507 A JP2002195507 A JP 2002195507A JP 2004007333 A JP2004007333 A JP 2004007333A
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JP
Japan
Prior art keywords
diaphragm
speaker
suspension holder
density
peripheral portion
Prior art date
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JP2002195507A
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Japanese (ja)
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JP3843901B2 (en
Inventor
Osamu Funahashi
舟橋　修
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Priority to JP2002195507A priority Critical patent/JP3843901B2/en
Publication of JP2004007333A publication Critical patent/JP2004007333A/en
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    • 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
    • H04R9/041—Centering
    • H04R9/043—Inner suspension or damper, e.g. spider

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To improve the rigidity of the entire vibration cone to result in reduction of its strain by making the density of its outer wall greater than the density of its inner wall. <P>SOLUTION: The speaker comprises a magnetic circuit 9 having a magnetic gap 14, a voice coil 15 movably provided in the magnetic gap 14, a vibration cone 17 with its inner wall connected to an outer portion of the gap 14, and a frame 19 connected to the outside of the cone 17 through a first edge 18. The inner wall of a suspension holder 25 is connected to a portion of the voice coil 15 at the magnetic circuit 9 away from its vibration cone 17. An outside portion thereof is connected to a frame 19 through a second edge 21. The first and the second edges 18, 21 have approximately symmetric similar shapes with a boundary between the first and the second edges 18, 21. The vibration cone 17 is coupled with the holder 25 at their middle portions, thus forming a speaker. An outer portion 27 of the cone 17 from its middle portion 26 is set to a higher density than that of its inner portion 28. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明はスピーカに関するものである。
【０００２】
【従来の技術】
従来のスピーカは図３に示すような構成となっていた。
【０００３】
すなわち、この図３に示すように、このスピーカは、磁気回路１と、この磁気回路１の磁気ギャップ２内に少なくともそのコイル部３が可動自在に設けられたボイスコイル体４と、このボイスコイル体４の磁気ギャップ２外方部分に、その内周が連結された振動板５と、この振動板５の外周がエッジ６を介して連結されたフレーム７とを備えた構成となっていた。
【０００４】
すなわち、ボイスコイル体４のボイスコイル部３にオーディオアンプ等から出力された電気信号を入力することで、ボイスコイル体４が起振し、その起振力が振動板５に伝達され、振動板５が空気を振動させて電気信号を音声に変換する構成となっていた。
【０００５】
上記構成の従来のスピーカは、ダンパー８が存在することによりこのダンパー８の可動負荷の非直線性や非対称性に起因するひずみが大きく発生すると同時にパワーリニアリティも悪化することとなっていた。
【０００６】
本発明者は、これらの課題を根本的に解決したスピーカを発明し、特願２００２−１１１７１７号として出願した。
【０００７】
図４はこの一実施の形態のスピーカの断面図を示している。すなわち、第１のエッジ１８と第２のエッジ２１によりサスペンションを構成させることによりダンパー８を排除するとともに、第１のエッジ１８と第２のエッジ２１を、その間を境に略対称相似形状とすることで、それ自体の非対称性をキャンセルするようにしたものであり、この構成によれば従来のスピーカと比べてひずみを大幅に低減することができる。
【０００８】
【発明が解決しようとする課題】
次に、さらなるひずみの低減を目指し、振動板１７Ａに着目した。
【０００９】
振動板１７Ａに求められる主な特性として軽さと剛性が挙げられる。すなわち、軽い振動板はボイスコイル体１５の起振力を素早く捉えることができるため音圧が上がり、強い剛性の振動板はこの起振力をリニアに音波として伝えることができる。
【００１０】
この振動板１７Ａに関して材料面、構造面等さまざまな検討がなされているが、軽さと剛性という特性は高いレベルで両立させることが難しく、さらなるひずみの低減において充分とはいえないものであった。
【００１１】
そこで本発明は、スピーカのさらなるひずみの低減を目的とするものである。
【００１２】
【課題を解決するための手段】
この目的を達成するために本発明の請求項１の発明は、磁気ギャップを有する磁気回路と、この磁気回路の前記磁気ギャップ内に少なくともそのコイル部が可動自在に設けられたボイスコイル体と、このボイスコイル体の磁気ギャップ外方部分に、その内周が連結された振動板と、この振動板の外周が第１のエッジを介して連結されたフレームとを備え、前記ボイスコイル体の前記振動板より前記磁気回路側にサスペンションホルダの内周を連結し、このサスペンションホルダの外周は第２のエッジを介して前記フレームに連結し、これら第１、第２のエッジは、これら第１、第２のエッジ間を境にして略対称相似形状とするとともに、前記振動板と前記サスペンションホルダを、その中部どうしで結合したスピーカであって、前記振動板の中部を境にして前記振動板の外周部の密度を前記振動板の内周部の密度より高く設定したものであり、振動板の剛性を向上させることができ、その結果、ひずみを低減することができるという作用効果を奏する。
【００１３】
すなわち、振動板の内周部は、その一端部がその中部を、その他端部がボイスコイル体を介してそれぞれサスペンションホルダと結合しているため充分な剛性を有している。したがって、振動板の外周部の密度を前記振動板の内周部の密度より高くすることにより振動板全体としての剛性を向上させることができ、その結果、ひずみを低減することができる。
【００１４】
また、振動板全体の密度を高くして剛性を上げる場合と比べて振動板の重量を軽くすることができるので、スピーカの能率低下をできるだけ抑制することができる。
【００１５】
本発明の請求項２に記載の発明は、振動板の中部とサスペンションホルダの中部との間に弾性体を介在させた請求項１に記載のスピーカであり、ひずみを低減することができるという作用効果を奏する。
【００１６】
すなわち、振動板とサスペンションホルダは構造の際に発生する寸法誤差をそれぞれ有しているため両者の中部間には隙間が発生する場合があるが、上記弾性体を介在させることによりこの隙間を埋めることができ、かつ、その弾性により振動板とサスペンションホルダとの構造の変形を防止することができ、その結果、スピーカとしてひずみを低減することができる。
【００１７】
本発明の請求項３に記載の発明は、弾性体の材料としてシリコンを用いた請求項２に記載のスピーカであり、請求項２の作用効果を補完するものである。
【００１８】
本発明の請求項４に記載の発明は、サスペンションホルダの外周部の密度と振動板の外周部の密度を略同等に設定した請求項１に記載のスピーカであり、サスペンションホルダの外周部の剛性も向上させることによりさらにひずみを低減することができるという作用効果を奏する。
【００１９】
本発明の請求項５に記載の発明は、振動板の中部とサスペンションホルダの中部との間に弾性体を介在させた請求項４に記載のスピーカであり、請求項２と同様の作用効果を奏する。
【００２０】
本発明の請求項６に記載の発明は、弾性体の材料としてシリコンを用いた請求項５に記載のスピーカであり、請求項３と同様の作用効果を奏する。
【００２１】
【発明の実施の形態】
以下、本発明の一実施の形態を用いて本発明のスピーカについて説明する。
【００２２】
図１は本発明の一実施の形態のスピーカの断面図を示し、図２は要部拡大半断面図である。図１において、９はリング状のマグネット１０、リング状のプレート１１、円板状のヨーク１２、円柱状のポール１３による磁気回路であり、プレート１１の内周とポール１３の外周間の磁気ギャップ１４にマグネット１０の磁束を集中させる。マグネット１０にはフェライト系や希土類コバルト系が、プレート１１及びヨーク１２、ポール１３には鉄が主な材料として用いられている。なお、図１、図２では外磁型の例を示しているが内磁型の磁気回路も幅広く用いられている。１５は磁気回路９の磁気ギャップ１４内に少なくともそのコイル部１６が可動自在に設けられた円筒状のボイスコイル体であり、一般的には紙及び樹脂、アルミ等の金属を材料としたボビンの上に、銅線などのコイルを巻いて構成している。
【００２３】
１７はボイスコイル体１５の磁気ギャップ外方部分に、その内周が連結された逆円錐状の振動板であり、ボイスコイル体１５に起振された振動により実際に音を出すもので、高い剛性と内部損失を両立したパルプ及び樹脂が主な材料として用いられる。そして、振動板１７の中部２６を境にして、振動板１７の外周部２７の密度を内周部２８の密度より高くしている。振動板１７の内周部２８は、その一端部を中部２６、弾性体２２を介して、またその他端部をボイスコイル体１５をそれぞれ介してサスペンションホルダ２５と結合している。つまり、振動板１７の内周部２８とサスペンションホルダ２５の内周部３１の二枚物となっているのでこれら全体として充分な剛性を有している。したがって、振動板１７の外周部２７の密度を前記振動板１７の内周部２８の密度より高くすることにより振動板全体としての剛性を向上させることができ、その結果、ひずみを低減することができる。
【００２４】
また、振動板１７全体の密度を高くして振動板１７の剛性を上げる場合と比べて振動板１７自体の重量を軽くすることができるので、スピーカの能率低下をできるだけ抑制することができる。つまり、振動板１７の軽さと剛性という特性を高いレベルで両立させることができる。
【００２５】
１８は振動板１７の外周に結合されたリング状の第１のエッジであり、振動板１７に可動負荷を加えないようにウレタン及びゴム、布などの材料が用いられる。１９は振動板１７の外周が第１のエッジ１８を介して連結された皿状のフレームであり、複雑な形状にも対応できるように鉄板プレス品や樹脂成型品及びアルミダイキャストなどの材料が用いられる。
【００２６】
２５は、ボイスコイル体１５の振動板１７より磁気回路９側に内周を連結したサスペンションホルダであり、高い剛性と内部損失を両立したパルプ及び樹脂が主な材料として用いられる。
【００２７】
このサスペンションホルダ２５は、図２に示すように、その内周と外周の間の中部３０を振動板１７の中部２６に弾性体２２を介して結合しており、これにより振動板１７とサスペンションホルダ２５の位相の振動が略同位相になるため、これら振動板１７とサスペンションホルダ２５の位相ずれに起因する中低音域の共振ひずみを低減することが可能で周波数特性の平坦化ができる。
【００２８】
ここで振動板１７とサスペンションホルダ２５は製造の際に発生する寸法誤差をそれぞれ有している。したがって、振動板１７とサスペンションホルダ２５の中部２６，３０間には隙間が発生する場合があるが、前記弾性体２２を介在させることによりこの隙間を埋めることができ、かつ、その弾性により振動板１７とサスペンションホルダ２５との構造の変形を防止することができ、その結果、スピーカとしてひずみを低減することができる。
【００２９】
この弾性体２２としては、例えばシリコン系接着剤など接着後に弾性を有するものが挙げられる。
【００３０】
また、サスペンションホルダ２５の外周部２９の密度と振動板１７の外周部２７の密度を略同等に設定することでサスペンションホルダ２５の外周部２９の剛性も向上させることによりさらにひずみを低減することができる。
【００３１】
２１は、サスペンションホルダ２５の外周をフレーム１９に結合する第２のエッジであり、第１のエッジ１８と同様にサスペンションホルダ２５に可動負荷を加えないようにウレタン及びゴム、布などの材料が用いられる。
【００３２】
以上のように構成された一実施の形態のスピーカについて、以下にその作動について説明する。
【００３３】
ボイスコイル体１５のコイル部１６にオーディオアンプ等から出力された電気信号を入力することで、ボイスコイル体１５が起振し、この起振力が振動板１７に伝達され、振動板１７が空気を振動させて電気信号を音声に変換する。
【００３４】
【発明の効果】
以上のように本発明は、磁気ギャップを有する磁気回路と、この磁気回路の前記磁気ギャップ内に少なくともそのコイル部が可動自在に設けられたボイスコイル体と、このボイスコイル体の磁気ギャップ外方部分に、その内周が連結された振動板と、この振動板の外周が第１のエッジを介して連結されたフレームとを備え、前記ボイスコイル体の前記振動板より前記磁気回路側にサスペンションホルダの内周を連結し、このサスペンションホルダの外周は第２のエッジを介して前記フレームに連結し、これら第１、第２のエッジは、これら第１、第２のエッジ間を境にして略対称相似形状とするとともに、前記振動板と前記サスペンションホルダを、その中部どうしで結合したスピーカであって、前記振動板の中部を境にして前記振動板の外周部の密度を前記振動板の内周部の密度より高く設定したものであり、振動板の剛性を向上させることができ、その結果、ひずみを低減することができるという作用効果を奏する。
【００３５】
すなわち、振動板の内周部は、その一端部がその中部を、その他端部がボイスコイル体を介してそれぞれサスペンションホルダと結合しているため充分な剛性を有している。したがって、振動板の外周部の密度を前記振動板の内周部の密度より高くすることにより振動板全体としての剛性を向上させることができ、その結果、ひずみを低減することができる。
【００３６】
また、振動板全体の密度を高くして剛性を上げる場合と比べて振動板の重量を低くすることができるので、スピーカの能率低下をできるだけ抑制することができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態のスピーカの断面図
【図２】同要部拡大半断面図
【図３】従来のスピーカの断面図
【図４】従来のスピーカの断面図
【符号の説明】
９　磁気回路
１０　マグネット
１１　プレート
１２　ヨーク
１３　ポール
１４　磁気ギャップ
１５　ボイスコイル体
１６　コイル部
１７　振動板
１８　第１のエッジ
１９　フレーム
２１　第２のエッジ
２２　弾性体
２５　サスペンションホルダ
２６　振動板の中部
２７　振動板の外周部
２８　振動板の内周部
２９　サスペンションホルダの外周部
３０　サスペンションホルダの中部
３１　サスペンションホルダの内周部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a speaker.
[0002]
[Prior art]
A conventional speaker has a configuration as shown in FIG.
[0003]
That is, as shown in FIG. 3, the loudspeaker includes a magnetic circuit 1, a voice coil body 4 having at least a coil portion 3 movably provided in a magnetic gap 2 of the magnetic circuit 1, and a voice coil A configuration was provided in which a diaphragm 5 having an inner periphery connected to an outer portion of the magnetic gap 2 of the body 4 and a frame 7 having an outer periphery of the diaphragm 5 connected via an edge 6.
[0004]
That is, by inputting an electric signal output from an audio amplifier or the like to the voice coil unit 3 of the voice coil unit 4, the voice coil unit 4 vibrates, and the vibrating force is transmitted to the diaphragm 5, 5 is configured to vibrate air to convert an electric signal into a sound.
[0005]
In the conventional speaker having the above-described configuration, the presence of the damper 8 causes a large distortion due to the non-linearity and asymmetry of the movable load of the damper 8, and also deteriorates the power linearity.
[0006]
The present inventor has invented a speaker that fundamentally solves these problems, and has filed an application as Japanese Patent Application No. 2002-111717.
[0007]
FIG. 4 is a sectional view of the speaker according to the embodiment. That is, the damper 8 is eliminated by forming the suspension by the first edge 18 and the second edge 21, and the first edge 18 and the second edge 21 are made to be substantially symmetric and similar with the boundary therebetween. This cancels the asymmetry of itself, and according to this configuration, distortion can be greatly reduced as compared with a conventional speaker.
[0008]
[Problems to be solved by the invention]
Next, in order to further reduce the distortion, attention was paid to the diaphragm 17A.
[0009]
Main characteristics required for the diaphragm 17A include lightness and rigidity. In other words, a light diaphragm can quickly capture the vibrating force of the voice coil body 15, so that the sound pressure increases. A strong rigid diaphragm can transmit this vibrating force linearly as sound waves.
[0010]
Various studies have been made on the diaphragm 17A in terms of material, structure and the like, but it has been difficult to achieve both high lightness and rigidity at a high level, and it has not been sufficient to further reduce distortion.
[0011]
Therefore, an object of the present invention is to further reduce distortion of a speaker.
[0012]
[Means for Solving the Problems]
In order to achieve this object, an invention according to claim 1 of the present invention provides a magnetic circuit having a magnetic gap, a voice coil body having at least a coil portion movably provided in the magnetic gap of the magnetic circuit, A diaphragm having an inner periphery connected to an outer portion of a magnetic gap of the voice coil body; and a frame having an outer periphery connected to the diaphragm via a first edge; An inner periphery of the suspension holder is connected to the magnetic circuit side from the diaphragm, and an outer periphery of the suspension holder is connected to the frame via a second edge. The first and second edges are connected to the first and second edges. A loudspeaker in which the diaphragm and the suspension holder are connected to each other at their middle portions while having a substantially symmetric similar shape with a boundary between the second edges. The density of the outer peripheral portion of the diaphragm is set higher than the density of the inner peripheral portion of the diaphragm with the boundary as a boundary, whereby the rigidity of the diaphragm can be improved, and as a result, the strain can be reduced. It has the effect of being able to perform.
[0013]
That is, the inner peripheral portion of the diaphragm has sufficient rigidity because one end portion is connected to the middle portion and the other end portion is connected to the suspension holder via the voice coil body. Therefore, by making the density of the outer peripheral portion of the diaphragm higher than the density of the inner peripheral portion of the diaphragm, rigidity of the entire diaphragm can be improved, and as a result, distortion can be reduced.
[0014]
Further, since the weight of the diaphragm can be reduced as compared with the case where the rigidity is increased by increasing the density of the entire diaphragm, a decrease in the efficiency of the speaker can be suppressed as much as possible.
[0015]
The invention according to claim 2 of the present invention is the speaker according to claim 1, wherein an elastic body is interposed between the center of the diaphragm and the center of the suspension holder. It works.
[0016]
That is, since the diaphragm and the suspension holder each have a dimensional error generated in the structure, a gap may be generated between the two parts. However, the gap is filled by interposing the elastic body. In addition, the elasticity prevents deformation of the structure of the diaphragm and the suspension holder, and as a result, distortion of the speaker can be reduced.
[0017]
The invention according to claim 3 of the present invention is the speaker according to claim 2, wherein silicon is used as the material of the elastic body, and complements the function and effect of claim 2.
[0018]
The invention according to claim 4 of the present invention is the speaker according to claim 1, wherein the density of the outer peripheral portion of the suspension holder and the density of the outer peripheral portion of the diaphragm are set substantially equal to each other, and the rigidity of the outer peripheral portion of the suspension holder is set. Also, the effect that the distortion can be further reduced can be achieved by improving the above.
[0019]
According to a fifth aspect of the present invention, there is provided the speaker according to the fourth aspect, wherein an elastic body is interposed between the middle part of the diaphragm and the middle part of the suspension holder. Play.
[0020]
According to a sixth aspect of the present invention, there is provided the speaker according to the fifth aspect, wherein silicon is used as a material of the elastic body, and the same effect as that of the third aspect is obtained.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a speaker of the present invention will be described using an embodiment of the present invention.
[0022]
FIG. 1 is a sectional view of a speaker according to an embodiment of the present invention, and FIG. 2 is an enlarged half sectional view of a main part. In FIG. 1, reference numeral 9 denotes a magnetic circuit including a ring-shaped magnet 10, a ring-shaped plate 11, a disk-shaped yoke 12, and a column-shaped pole 13, and a magnetic gap between the inner periphery of the plate 11 and the outer periphery of the pole 13. The magnetic flux of the magnet 10 is concentrated on 14. Ferrite or rare earth cobalt is used for the magnet 10, and iron is mainly used for the plate 11, the yoke 12, and the pole 13. Although FIGS. 1 and 2 show examples of the outer magnet type, the inner magnet type magnetic circuit is also widely used. Reference numeral 15 denotes a cylindrical voice coil body in which at least the coil portion 16 is movably provided in a magnetic gap 14 of the magnetic circuit 9, and is generally a bobbin made of metal such as paper and resin or aluminum. A coil such as a copper wire is wound thereon.
[0023]
Reference numeral 17 denotes an inverted conical diaphragm whose inner periphery is connected to the outer portion of the magnetic gap of the voice coil body 15, which actually emits sound by the vibration generated in the voice coil body 15, and is high. Pulp and resin having both rigidity and internal loss are used as main materials. The outer peripheral portion 27 of the diaphragm 17 has a higher density than the inner peripheral portion 28 with the middle portion 26 of the diaphragm 17 as a boundary. The inner peripheral portion 28 of the diaphragm 17 is connected at one end to the suspension holder 25 via the middle portion 26 and the elastic body 22 and at the other end via the voice coil body 15. That is, since the inner peripheral portion 28 of the diaphragm 17 and the inner peripheral portion 31 of the suspension holder 25 are formed of two pieces, they have sufficient rigidity as a whole. Therefore, by making the density of the outer peripheral portion 27 of the diaphragm 17 higher than the density of the inner peripheral portion 28 of the diaphragm 17, the rigidity of the entire diaphragm can be improved, and as a result, distortion can be reduced. it can.
[0024]
Further, since the weight of the diaphragm 17 itself can be reduced as compared with the case where the density of the entire diaphragm 17 is increased and the rigidity of the diaphragm 17 is increased, a decrease in the efficiency of the speaker can be suppressed as much as possible. That is, the characteristics of the lightness and rigidity of the diaphragm 17 can be compatible at a high level.
[0025]
Reference numeral 18 denotes a ring-shaped first edge coupled to the outer periphery of the diaphragm 17, and a material such as urethane, rubber, or cloth is used so as not to apply a movable load to the diaphragm 17. Reference numeral 19 denotes a dish-shaped frame in which the outer periphery of the diaphragm 17 is connected via the first edge 18, and is made of a material such as an iron plate pressed product, a resin molded product, and an aluminum die cast so as to be able to cope with a complicated shape. Used.
[0026]
Reference numeral 25 denotes a suspension holder having an inner periphery connected to the magnetic circuit 9 side of the diaphragm 17 of the voice coil body 15, and pulp and resin having both high rigidity and internal loss are used as main materials.
[0027]
As shown in FIG. 2, the suspension holder 25 has a middle portion 30 between the inner circumference and the outer circumference connected to a middle portion 26 of the diaphragm 17 via an elastic body 22. Since the vibrations of the phases 25 are substantially in phase, resonance distortion in the middle and low sound range due to the phase shift between the diaphragm 17 and the suspension holder 25 can be reduced, and the frequency characteristics can be flattened.
[0028]
Here, the diaphragm 17 and the suspension holder 25 each have a dimensional error generated at the time of manufacturing. Therefore, a gap may be generated between the diaphragm 17 and the middle portions 26 and 30 of the suspension holder 25. However, the gap can be filled by interposing the elastic body 22, and the diaphragm can be filled by its elasticity. 17 and the suspension holder 25 can be prevented from being deformed, and as a result, distortion can be reduced as a speaker.
[0029]
Examples of the elastic body 22 include those having elasticity after bonding, such as a silicone adhesive.
[0030]
Further, by setting the density of the outer peripheral portion 29 of the suspension holder 25 and the density of the outer peripheral portion 27 of the diaphragm 17 to be substantially equal, the rigidity of the outer peripheral portion 29 of the suspension holder 25 is also improved, thereby further reducing distortion. it can.
[0031]
Reference numeral 21 denotes a second edge that couples the outer periphery of the suspension holder 25 to the frame 19, and is made of a material such as urethane, rubber, or cloth so as not to apply a movable load to the suspension holder 25, similarly to the first edge 18. Can be
[0032]
The operation of the loudspeaker according to the embodiment configured as described above will be described below.
[0033]
By inputting an electric signal output from an audio amplifier or the like to the coil portion 16 of the voice coil body 15, the voice coil body 15 vibrates, and the vibrating force is transmitted to the diaphragm 17, and the diaphragm 17 Vibrates to convert the electric signal into voice.
[0034]
【The invention's effect】
As described above, the present invention provides a magnetic circuit having a magnetic gap, a voice coil body having at least a coil portion movably provided in the magnetic gap of the magnetic circuit, A diaphragm having an inner periphery connected thereto, and a frame having an outer periphery connected to the diaphragm via a first edge, wherein a suspension is provided on the magnetic circuit side of the voice coil body from the diaphragm. The inner periphery of the holder is connected, the outer periphery of the suspension holder is connected to the frame via a second edge, and the first and second edges are separated from the first and second edges. A speaker in which the diaphragm and the suspension holder are connected to each other at a central portion thereof with a substantially symmetric and similar shape, wherein the speaker is disposed outside the diaphragm with a middle portion of the diaphragm as a boundary. And the density of the part which is set higher than the density of the inner peripheral portion of the diaphragm, it is possible to improve the rigidity of the diaphragm, so that advantageous effects that it is possible to reduce the distortion.
[0035]
That is, the inner peripheral portion of the diaphragm has sufficient rigidity because one end portion is connected to the middle portion and the other end portion is connected to the suspension holder via the voice coil body. Therefore, by making the density of the outer peripheral portion of the diaphragm higher than the density of the inner peripheral portion of the diaphragm, rigidity of the entire diaphragm can be improved, and as a result, distortion can be reduced.
[0036]
Further, since the weight of the diaphragm can be reduced as compared with the case where the rigidity is increased by increasing the density of the entire diaphragm, a decrease in the efficiency of the speaker can be suppressed as much as possible.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a speaker according to an embodiment of the present invention. FIG. 2 is an enlarged half cross-sectional view of a main part of the speaker. FIG. 3 is a cross-sectional view of a conventional speaker. Description】
Reference Signs List 9 magnetic circuit 10 magnet 11 plate 12 yoke 13 pole 14 magnetic gap 15 voice coil body 16 coil portion 17 diaphragm 18 first edge 19 frame 21 second edge 22 elastic member 25 suspension holder 26 diaphragm 27 middle portion diaphragm Outer peripheral portion 28 of diaphragm inner peripheral portion 29 outer peripheral portion of suspension holder 30 middle portion of suspension holder inner peripheral portion of suspension holder

Claims (6)

磁気ギャップを有する磁気回路と、この磁気回路の前記磁気ギャップ内に少なくともそのコイル部が可動自在に設けられたボイスコイル体と、このボイスコイル体の磁気ギャップ外方部分に、その内周が連結された振動板と、この振動板の外周が第１のエッジを介して連結されたフレームとを備え、前記ボイスコイル体の前記振動板より前記磁気回路側にサスペンションホルダの内周を連結し、このサスペンションホルダの外周は第２のエッジを介して前記フレームに連結し、これら第１、第２のエッジは、これら第１、第２のエッジ間を境にして略対称相似形状とするとともに、前記振動板と前記サスペンションホルダを、その中部どうしで結合したスピーカであって、前記振動板の中部を境にして前記振動板の外周部の密度を前記振動板の内周部の密度より高く設定したスピーカ。A magnetic circuit having a magnetic gap, a voice coil body having at least a coil portion movably provided in the magnetic gap of the magnetic circuit, and an inner periphery connected to an outer portion of the magnetic gap of the voice coil body And a frame having the outer periphery of the diaphragm connected via a first edge, and connecting the inner periphery of a suspension holder to the magnetic circuit side of the voice coil body from the diaphragm, The outer periphery of the suspension holder is connected to the frame via a second edge, and the first and second edges are substantially symmetric and similar with a boundary between the first and second edges. A speaker in which the diaphragm and the suspension holder are connected to each other at a middle portion thereof, wherein a density of an outer peripheral portion of the diaphragm is set at a center of the diaphragm. Speaker set higher than the density of the inner peripheral portion. 振動板の中部とサスペンションホルダの中部との間に弾性体を介在させた請求項１に記載のスピーカ。The speaker according to claim 1, wherein an elastic body is interposed between a center part of the diaphragm and a center part of the suspension holder. 弾性体としてシリコン系接着剤を用いた請求項２に記載のスピーカ。The speaker according to claim 2, wherein a silicon-based adhesive is used as the elastic body. サスペンションホルダの外周部の密度と振動板の外周部の密度を略同等に設定した請求項１に記載のスピーカ。The loudspeaker according to claim 1, wherein the density of the outer peripheral portion of the suspension holder and the density of the outer peripheral portion of the diaphragm are set substantially equal. 振動板の中部とサスペンションホルダの中部との間に弾性体を介在させた請求項４に記載のスピーカ。The speaker according to claim 4, wherein an elastic body is interposed between a center part of the diaphragm and a center part of the suspension holder. 弾性体としてシリコン系接着剤を用いた請求項５に記載のスピーカ。The speaker according to claim 5, wherein a silicon-based adhesive is used as the elastic body.
JP2002195507A 2002-04-15 2002-07-04 Speaker Expired - Lifetime JP3843901B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006022119A1 (en) * 2004-08-27 2006-03-02 Matsushita Electric Industrial Co., Ltd. Speaker

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9485586B2 (en) 2013-03-15 2016-11-01 Jeffery K Permanian Speaker driver

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006022119A1 (en) * 2004-08-27 2006-03-02 Matsushita Electric Industrial Co., Ltd. Speaker
KR100747938B1 (en) * 2004-08-27 2007-08-08 마츠시타 덴끼 산교 가부시키가이샤 Speaker
US7532736B2 (en) 2004-08-27 2009-05-12 Panasonic Corporation Speaker

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