JPH05103395A - Damper for loudspeaker - Google Patents

Abstract

PURPOSE:To provide a damper for loudspeakers having excellent characteristics by improving the stiffness linearity of a damper for dynamic loudspeakers and reducing the harmonic distortion appearing in the sound pressure characteristic due to nonlinearity. CONSTITUTION:Plural pieces, each of which is formed in such a way that the boundary 13 between its frame fixing section 11 and mobile section 12 is linear and its cross section along a line extended from both ends of a semicircle to the middle of the mobile section 12 has a roll shape, are radially arranged around a voice coil 16 and fixed to a frame while tension is applied to the fixing sections 11 in the outer peripheral direction. Therefore, a damper for loudspeakers which is excellent from a very small amplitude to a large amplitude can be obtained.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は動電形スピーカに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodynamic speaker.

【０００２】[0002]

【従来の技術】近年、電気音響変換器の一つとしての動
電型スピーカが、音楽・音声の再生に利用されることが
多くなっている。2. Description of the Related Art In recent years, an electrodynamic speaker as one of electro-acoustic transducers has been increasingly used for reproducing music and voice.

【０００３】以下に従来の動電型スピーカについて図面
を参照しながら説明する。動電型スピーカは図５に示す
ように、マグネット１、マグネット１の上面に設けられ
た上ヨーク２、マグネット１の下面に設けられた下ヨー
ク３、下ヨーク３と連続しているセンターポール４、上
ヨーク２の内周面とセンターポール４の外周面との間に
できる磁気空隙５、上ヨーク２の上面に設けられたフレ
ーム６、磁気空隙５内に納められたボイスコイル７、内
周をボイスコイル７に、外周をフレーム６に固着した波
形のダンパー８、内周をボイスコイル７に、外周を後述
するエッジに固着した振動板９、内周を振動板９に、外
周をフレーム６に固着したエッジ１０などで構成されて
いる。A conventional electrodynamic speaker will be described below with reference to the drawings. As shown in FIG. 5, the electrodynamic speaker includes a magnet 1, an upper yoke 2 provided on the upper surface of the magnet 1, a lower yoke 3 provided on the lower surface of the magnet 1, and a center pole 4 continuous with the lower yoke 3. A magnetic gap 5 formed between the inner peripheral surface of the upper yoke 2 and the outer peripheral surface of the center pole 4, a frame 6 provided on the upper surface of the upper yoke 2, a voice coil 7 housed in the magnetic gap 5, an inner periphery To a voice coil 7, a waveform-shaped damper 8 having an outer periphery fixed to a frame 6, an inner periphery to a voice coil 7, a diaphragm 9 having an outer periphery fixed to an edge described later, an inner periphery to a diaphragm 9, and an outer periphery to the frame 6 It is composed of the edge 10 and the like fixed to the.

【０００４】以上のように構成された動電型スピーカに
ついて、以下その動作を説明する。ボイスコイル７に巻
いてあるコイルに電流を流すと、磁気空隙５内の磁界に
対し電流が直交することになり、フレミングの法則によ
り、磁界と電流のそれぞれと直角な方向に力が生じる。
このときダンパー８およびエッジ１０はボイスコイル７
をセンターポール４と同心になるように支持し、振動板
９が振動したときに上ヨーク２の厚み方向の中点とボイ
スコイル７のコイル巻幅の中点を一致させるように力が
加わる振動方向のばねとして働く。ボイスコイル７に交
流を流すと、ボイスコイル７と振動板９は、ダンパー８
およびエッジ１０に支持されながら振動するため、空気
が振動し疎密波が発生し、音となって聞こえる。The operation of the electrodynamic speaker constructed as above will be described below. When an electric current is passed through the coil wound around the voice coil 7, the electric current is orthogonal to the magnetic field in the magnetic air gap 5, and a force is generated in the directions perpendicular to the magnetic field and the electric current according to Fleming's law.
At this time, the damper 8 and the edge 10 are attached to the voice coil 7.
Is supported so as to be concentric with the center pole 4, and when the diaphragm 9 vibrates, a force is applied so that the midpoint in the thickness direction of the upper yoke 2 and the midpoint of the coil winding width of the voice coil 7 are matched. Acts as a direction spring. When an alternating current is applied to the voice coil 7, the voice coil 7 and the vibration plate 9 move to the damper 8
Further, since the air vibrates while being supported by the edge 10, air vibrates and compressional waves are generated, which is heard as a sound.

【０００５】[0005]

【発明が解決しようとする課題】しかしながら上記従来
の構成では、第一の問題点として、従来の波形のダンパ
ー８は円周方向に閉じた構造であるため、図６の振動時
のダンパー断面図に示すように、任意の点Ｐについて考
えたとき、△Ｘだけダンパーが振動すると点Ｐの径は△
ｒ変化することになり、円周方向に力が発生する。この
ため、大振幅振動が困難となり図３に示す「力−変位」
特性図のＡ曲線に示すように大振幅時に変位が飽和して
しまいスチフネスが非直線となる。However, in the above-mentioned conventional structure, the first problem is that the conventional corrugated damper 8 has a structure that is closed in the circumferential direction. As shown in, when the arbitrary point P is considered, if the damper vibrates by ΔX, the diameter of the point P becomes Δ
Therefore, a force is generated in the circumferential direction. Therefore, large-amplitude vibration becomes difficult, and the "force-displacement" shown in FIG.
As shown by the curve A in the characteristic diagram, the displacement is saturated at a large amplitude and the stiffness becomes non-linear.

【０００６】第２の問題点として、図４に示す特性Ａの
微小入力時の「力−変位」特性図に示すように、変位が
微小なときはダンパーの復元力が非常に小さくスチフネ
スが非直線となる。これらの現象が原因となって音圧周
波数特性に高調波歪が発生するという問題点を有してい
た。As a second problem, as shown in the "force-displacement" characteristic diagram at the time of minute input of the characteristic A shown in FIG. 4, the restoring force of the damper is very small and the stiffness is not large when the displacement is minute. It becomes a straight line. Due to these phenomena, there is a problem that harmonic distortion occurs in the sound pressure frequency characteristic.

【０００７】本発明は上記従来の問題点を解決するもの
で、歪の原因となっているダンパーの非直線性を改善し
直線性のよいスピーカ用ダンパーを提供することを目的
とする。The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a speaker damper having good linearity by improving the non-linearity of the damper which causes distortion.

【０００８】[0008]

【課題を解決するための手段】上記目的を達成するため
に本発明のスピーカ用ダンパーは、固定部と可動部の境
界線が直線で、さらに、可動部の中途に半円の両端部か
ら直線を延長した断面形状がロール状をした個片がボイ
スコイルの周囲に放射状に複数個配置し、各個片のフレ
ーム固定部を外周方向に張力を加えた状態でフレームに
固定した構造としている。In order to achieve the above object, a speaker damper according to the present invention has a straight line between a fixed portion and a movable portion, and a straight line from both ends of a semicircle in the middle of the movable portion. A plurality of individual pieces each having a roll-shaped extended cross section are radially arranged around the voice coil, and the frame fixing portion of each individual piece is fixed to the frame with tension applied in the outer peripheral direction.

【０００９】[0009]

【作用】本発明は上記した構成によって、微小振幅時か
ら大振幅時まで直線性のよいスピーカ用ダンパーが得ら
れる。According to the present invention, the speaker damper having a good linearity can be obtained from the minute amplitude to the large amplitude by the above-mentioned structure.

【００１０】[0010]

【実施例】以下本発明の一実施例について、図面を参照
しながら説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

【００１１】図１、図２に示すように、ダンパーはフレ
ーム固定部１１、ロール状をした可動部１２、フレーム
固定部１１と可動部１２の境界線である可動部外周境界
線１３、ボイスコイル固定部１４、可動部１２とボイス
コイル固定部１４の境界線である可動部内周境界線１
５、ボイスコイル固定部１４の内周に固定したボイスコ
イル１６で構成されている。As shown in FIGS. 1 and 2, the damper includes a frame fixed part 11, a movable part 12 in a roll shape, a movable part outer peripheral boundary line 13 which is a boundary line between the frame fixed part 11 and the movable part 12, a voice coil. Inner boundary line 1 of the movable part, which is a boundary line between the fixed part 14, the movable part 12 and the voice coil fixed part 14.
5. The voice coil fixing part 14 is composed of a voice coil 16 fixed to the inner circumference.

【００１２】以上のように構成されたスピーカ用ダンパ
ーについて、以下その動作について説明する。スピーカ
ユニットとしての発音の動作は従来例と同様である。可
動部１２、可動部外周境界線１３、可動部内周境界線１
５が、ボイスコイル１６の円周上の接線に平行な直線で
構成されているため、従来のダンパーの動作で述べたよ
うな円周方向にかかる力は発生せず、さらに、可動部１
２のロール状をした個片が上下対称になる構成としてい
るため、図３に示す大振幅時の「力−変位」特性図のＢ
曲線のように大振幅まで直線性に優れたスチフネスが得
られる。また、ダンパーのフレーム固定部を外周方向に
張力を加えた状態でフレームに固定しているため、微小
振幅時の復元力の非常に弱い部分を使わずに振動させる
ことができ、図４に示す微小振幅時の「力−変位」特性
図のＢのように直線性の良いスチフネスが得られる。The operation of the speaker damper thus constructed will be described below. The operation of producing sound as a speaker unit is similar to that of the conventional example. Movable part 12, movable part outer boundary line 13, movable part inner boundary line 1
Since 5 is composed of a straight line parallel to the tangential line on the circumference of the voice coil 16, the force exerted in the circumferential direction as described in the operation of the conventional damper is not generated, and further, the movable portion 1
Since the two roll-shaped pieces are vertically symmetrical, B of the "force-displacement" characteristic diagram at large amplitude shown in FIG.
Stiffness excellent in linearity can be obtained up to large amplitude like a curve. Further, since the frame fixing portion of the damper is fixed to the frame in a state where tension is applied in the outer peripheral direction, it is possible to vibrate without using a portion where the restoring force at the time of minute amplitude is very weak, as shown in FIG. Stiffness with good linearity can be obtained as indicated by B in the "force-displacement" characteristic diagram at a minute amplitude.

【００１３】ここで、フレーム固定端に内周方向の力を
加えて固定すると、振動している途中の段階でダンパー
に張力がかからない振動位置を通過することになり、こ
の位置の前後で復元力が弱くなり非線形なスチフネスと
なってしまう。また、隣合う個片のフレーム固定部を高
さ方向に交互に上下させて固定すことによる張力のかけ
方においても同様に非線形なスチフネスとなる。よっ
て、どのような変位量においても可動部１２に張力をか
けることのできる外周方向への張力が有効である。本実
施例のスピーカ用ダンパーは、大振幅を要求されるスピ
ーカユニットに用いられることが多く、大振幅を可能に
するため可動部１２の中途に半円の両端部から直線を延
長した断面形状がロール状をした形状とした。さらに、
大振幅時の耐久性をもたせるため図１（ａ）の平面図に
示すように、屈曲を繰り返す可動部１２の面積を大きく
とれるように台形の個片形状とした。Here, if a force in the inner circumferential direction is applied to the frame fixed end to fix the frame, the damper will pass through a vibration position where no tension is applied to the damper in the middle of the vibration, and the restoring force before and after this position. Becomes weaker and becomes a non-linear stiffness. Further, the non-linear stiffness is also obtained in the manner of applying tension by alternately fixing the frame fixing portions of adjacent pieces by moving them up and down in the height direction. Therefore, tension in the outer circumferential direction that can apply tension to the movable portion 12 is effective regardless of the amount of displacement. The speaker damper of this embodiment is often used in a speaker unit that requires a large amplitude, and has a cross-sectional shape in which a straight line is extended from both ends of a semicircle in the middle of the movable portion 12 in order to enable a large amplitude. The shape was a roll. further,
As shown in the plan view of FIG. 1 (a), in order to provide durability at a large amplitude, the trapezoidal piece is formed so that the area of the movable portion 12 that repeatedly bends can be large.

【００１４】なお、本実施例では、個片の数を１０個と
したが、複数であればよい。In this embodiment, the number of pieces is 10, but it may be any number.

【００１５】[0015]

【発明の効果】以上の実施例から明らかなように本発明
は、固定部と可動部の境界線が直線で、さらに、可動部
の中途に半円の両端部から直線を延長した断面形状がロ
ール状をした個片がボイスコイルの周囲に放射状に複数
個配置し、各個片のフレーム固定部を外周方向に張力を
加えた状態でフレームに固定した構造にしたことによ
り、微小振幅から大振幅まで直線性のよいスチフネスを
得られ、歪の少い優れたスピーカ用ダンパーを実現でき
るものである。As is apparent from the above embodiments, the present invention has a straight line between the fixed part and the movable part, and a straight line extending from both ends of the semicircle in the middle of the movable part. By arranging a plurality of roll-shaped pieces radially around the voice coil and fixing the frame fixing part of each piece to the frame with tension applied in the outer peripheral direction, a small amplitude to a large amplitude can be obtained. It is possible to obtain a stiffness with good linearity and to realize an excellent speaker damper with little distortion.

【図面の簡単な説明】[Brief description of drawings]

【図１】（ａ）は本発明の一実施例のスピーカ用ダンパ
ー平面図 （ｂ）は同側面図1A is a plan view of a speaker damper according to an embodiment of the present invention, and FIG. 1B is a side view of the same.

【図２】同実施例のスピーカ用ダンパー斜視図FIG. 2 is a perspective view of a speaker damper of the same embodiment.

【図３】同スピーカ用ダンパーの大振幅時の「力−変
位」特性図[Fig. 3] "Force-displacement" characteristic diagram of the speaker damper at large amplitude

【図４】同スピーカ用ダンパーの微小振幅時の「力−変
位」特性図FIG. 4 is a characteristic diagram of “force-displacement” when the damper for the speaker has a small amplitude.

【図５】従来のスピーカ用ダンパーを用いたスピーカユ
ニット断面図FIG. 5 is a sectional view of a speaker unit using a conventional speaker damper.

【図６】同スピーカ用ダンパー振動時の断面図FIG. 6 is a cross-sectional view when the damper for the speaker vibrates.

【符号の説明】[Explanation of symbols]

１１ フレーム固定部 １２ 可動部（ロール状） １３ 可動部外周境界線 １４ ボイスコイル固定部 １５ 可動部内周境界線 １６ ボイスコイル 11 Frame Fixed Part 12 Movable Part (Rolled) 13 Movable Part Outer Boundary Line 14 Voice Coil Fixed Part 15 Movable Part Inner Boundary Line 16 Voice Coil

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】上下に移動するボイスコイルを支持するよ
うにフレームに固定された支持体を有し、固定部と可動
部の境界線が直線で、さらに、前記可動部の中途に半円
の両端部から直線を延長した断面形状がロール状をした
個片が前記ボイスコイルの周囲に放射状に複数個配置し
てなるスピーカ用ダンパー。1. A support body fixed to a frame so as to support a voice coil moving up and down, a boundary line between the fixed portion and the movable portion is a straight line, and a semicircle is formed in the middle of the movable portion. A damper for a speaker, wherein a plurality of individual pieces each having a roll shape in a straight line extending from both ends are radially arranged around the voice coil. 【請求項２】ロール状をした各個片が交互に上向き、下
向きに配置されてなる請求項１記載のスピーカ用ダンパ
ー。2. The speaker damper according to claim 1, wherein the individual roll-shaped pieces are alternately arranged facing upward and downward. 【請求項３】ロール状をした各個片がボイスコイルの円
周上の接線に平行な直線に沿って延びるように配されて
なる請求項１記載のスピーカ用ダンパー。3. The speaker damper according to claim 1, wherein each roll-shaped piece is arranged so as to extend along a straight line parallel to a tangent line on the circumference of the voice coil. 【請求項４】各個片の平面図がボイスコイル側を短辺、
フレーム側を長辺とした台形の形状をしてなる請求項１
記載のスピーカ用ダンパー。4. A plan view of each piece has a voice coil side on a short side,
A trapezoidal shape having the frame side as a long side.
The speaker damper described. 【請求項５】各個片のフレーム固定部を外周方向に張力
を加えた状態でフレームに固定してなるスピーカ用ダン
パー。5. A speaker damper in which the frame fixing portion of each piece is fixed to the frame in a state where tension is applied in the outer peripheral direction.