JP2000023279A - Speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to stabilize oscillation, to prevent the raise of a low band resonance frequency and to attain sound quality improvement by equipping a sound path for letting air to pass in a reverse direction to sound radiating force and using reactive force against the radiating force of the air in an opposite direction passing this sound path to suppress or attenuate the reaction of the sound radiating force. SOLUTION: A gap is made between up-and-down and right-and-left side plates of a frame material 26 of an almost cubic shape which are integrally molded with a baffle plate 2F and whose rear part is opened and up-and-down and right-and-left side plates of a casing frame 27 provided so as to cover this frame material 26, a sound path 25 is formed and, at the same time, a cavity part 24 surrounded by the casing frame 27 and the casing rear face plate 30 is formed. Here, since an air in the cavity part 24 expands when an oscillation plate 10 is operated and moved in an F1 direction, a great amount of air flows into the sound path 25 by way of a hole dug on the up-and-down or right-and-left face of the casing frame 27. At this time, in the sound path 25, the radiating force FDS of the air passing this sound path 25 operates sand becomes the radiating force in a direction which offsets or attenuates the sound radiating force.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は小型軽量なスピーカ
装置に係わり、特にスピーカの音放射力の反作用力を音
道を用いて抑制又は減衰させる様に成したスピーカ装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small and lightweight loudspeaker device, and more particularly to a loudspeaker device for suppressing or attenuating a reaction force of a sound radiation force of a speaker by using a sound path.

【０００２】[0002]

【従来の技術】従来からスピーカ装置の低域再生限界を
伸ばすための有効な手段として例えば、スピーカを設け
たバッフル板に開口及びダクトを設け、スピーカの振動
板の背面から出た音の位相を反転して、ダクトを介して
開口から外部に放射させて、スピーカの振動板から前面
に出る音波を強め、低音域を歪まない様になしたバスレ
フレックス型（位相反転型）スピーカ装置は良く知られ
ている。2. Description of the Related Art Conventionally, as an effective means for extending the low-frequency reproduction limit of a speaker device, for example, an opening and a duct are provided in a baffle plate provided with a speaker, and a phase of a sound emitted from a back surface of a diaphragm of the speaker is adjusted. A bass reflex type (phase inversion type) loudspeaker device which is inverted and radiated to the outside from an opening through a duct to enhance the sound wave emitted from the diaphragm of the speaker to the front so as not to distort the low frequency range is well known. Have been.

【０００３】この様な位相反転型スピーカ装置は図１５
Ａに示す様に構成される。即ちスピーカボックス１の前
面に設けたバッフル板２Ｆに穿ったスピーカ放音孔２ａ
に対向してスピーカ３を固定する。[0003] Such a phase inversion type speaker device is shown in FIG.
A is configured as shown in FIG. That is, a speaker sound emission hole 2a formed in a baffle plate 2F provided on the front surface of the speaker box 1.
, And the speaker 3 is fixed.

【０００４】このスピーカ３は例えば、図１５Ａに示す
如く、リング状マグネット４と、このリング状マグネッ
ト４を挟むように取付けられたプレート５及びヨーク６
とを設け、プレート５の内周側とヨーク６のセンターポ
ール６ａとの間に磁気空隙７を形成する。またプレート
５にはスピーカ３のフレーム８が取付けられ、フレーム
８の外周部にはエッジ９が設けられ、このエッジ９によ
ってコーン型の振動板１０の外周部が保持されている。As shown in FIG. 15A, for example, the speaker 3 includes a ring-shaped magnet 4, a plate 5 and a yoke 6 mounted so as to sandwich the ring-shaped magnet 4.
And a magnetic gap 7 is formed between the inner peripheral side of the plate 5 and the center pole 6 a of the yoke 6. A frame 8 of the speaker 3 is mounted on the plate 5, and an edge 9 is provided on an outer peripheral portion of the frame 8, and the outer peripheral portion of the cone-shaped diaphragm 10 is held by the edge 9.

【０００５】一方、振動板１０の内周部にボイスコイル
ボビン１１が取付けられており、このボイスコイルボビ
ン１１にはボイスコイル１２が巻装され、ボイスコイル
１２はプレート５及びヨーク６のセンターポール６ａに
よって形成された磁気空隙７内に挿入する様になされて
いる。１７はこのボイスコイル１２をこの磁気空隙７内
に保持するためのダンパーである。On the other hand, a voice coil bobbin 11 is mounted on the inner peripheral portion of the diaphragm 10, and a voice coil 12 is wound around the voice coil bobbin 11, and the voice coil 12 is fixed by a center pole 6a of the plate 5 and the yoke 6. It is designed to be inserted into the formed magnetic gap 7. Reference numeral 17 denotes a damper for holding the voice coil 12 in the magnetic gap 7.

【０００６】またスピーカボックス１の外部の所定位置
に設けられた入力端子１３ａよりの音響信号を接続線１
４ａを介してスピーカ３の端子１５に供給し、端子１５
よりの音響信号を錦糸線１６を介してボイスコイル１２
に供給している。An acoustic signal from an input terminal 13a provided at a predetermined position outside the speaker box 1 is connected to a connection line 1
4a to the terminal 15 of the speaker 3 via the terminal 15a.
Of the voice coil 12 via the tinsel wire 16
To supply.

【０００７】また、バッフル板２Ｆのスピーカ取付孔２
ａと同一面に開口１８ａを有するダクト１８を設け、ス
ピーカ３の振動板１０の背面から出た音の位相を反転し
て、このダクト１８からスピーカボックス１の外に放射
し、この振動板１０の前面からでる音の低音域を広げて
いる。The speaker mounting hole 2 of the baffle plate 2F
A duct 18 having an opening 18a is provided on the same surface as a, and the phase of the sound emitted from the back surface of the diaphragm 10 of the speaker 3 is inverted and radiated from the duct 18 to the outside of the speaker box 1, and the diaphragm 10 The low range of the sound coming out of the front of the is expanded.

【０００８】上述の如き、位相反転型のスピーカ装置で
の電気的な等価回路は図１５Ｂの様に表わすことが出来
る。[0008] As described above, an electrical equivalent circuit in a phase inversion type speaker device can be represented as shown in FIG. 15B.

【０００９】図１５Ａ及び図１５Ｂで、Ｓ₀ はスピーカ
３の支持系のスチフネス、Ｍ₀ はスピーカ３の支持系の
等価質量、Ｒ_ms0 はスピーカ支持系の機械抵抗、Ｒ_m0は
スピーカの空気負荷の機械抵抗、Ｒ₀ はスピーカの等価
機械抵抗でＲ_m0＋Ｒ_ms0 ＝Ｒ₀ で表せる。Ｓ_C はスピー
カボックス１内のスチフネス、Ｍ_D はダクト１８部分の
空気負荷の機械抵抗、Ｒ_D はダクト１８部分の空気質量
である。In FIGS. 15A and 15B, S ₀ is the stiffness of the support system of the speaker 3, M ₀ is the equivalent mass of the support system of the speaker 3, R _ms0 is the mechanical resistance of the speaker support system, and R _m0 is the air load of the speaker. mechanical resistance of, R ₀ is expressed by R _m0 + R _ms0 = R ₀ equivalent mechanical resistance of the speaker. S _C is the stiffness in the speaker box 1, M _D is the mechanical resistance of the air load in the duct 18, and R _D is the air mass in the duct 18.

【００１０】[0010]

【発明が解決しようとする課題】上述の様に位相反転型
のスピーカ装置とすることで、密閉型に比べて低音再生
限界を低くすることが出来て、スピーカ３の低音共振周
波数ｆ₀ の約８０％程度まで低域再生範囲を拡げること
が出来るとされている。[0007] With above phase inversion type speaker apparatus as in, to be able to lower the bass reproduction limit compared to sealed about the bass resonance frequency f ₀ of the speaker 3 It is said that the low-frequency reproduction range can be extended to about 80%.

【００１１】しかし、上記した従来のスピーカ装置で
は、ＡＢＳ樹脂等で小型軽量にスピーカボックス１を成
型するため次のような問題があった。この様なスピーカ
装置は小型軽量であるという特徴があるが、スピーカ３
の振動板１０が音を放射するために振動すれば、その振
動の放射力Ｆ₁ はスピーカ３の振動系の等価質量Ｍ₀ と
この振動系の動く加速度α₀ の積Ｆ₁ ＝Ｍ₀ ・α₀ とな
る。However, the conventional speaker device described above has the following problems because the speaker box 1 is made small and lightweight with an ABS resin or the like. Such a speaker device is characterized in that it is small and lightweight.
If the vibration to the vibration plate 10 emits sound, the vibration of the radiation force F ₁ is the acceleration alpha ₀ product F ₁ = M ₀ · a moving vibration system of the equivalent mass M ₀ Toko of the vibration system of the speaker 3 α ₀ .

【００１２】従って、スピーカ３の音の放射力の反作用
力−Ｆ₁ をスピーカボックス１が受けるが、スピーカ装
置が小型軽量で重量Ｗが小さいので、この反作用力−Ｆ
₁ によってスピーカボックス１を揺動させ、スピーカ３
より放射される力が弱まり、音質を劣化させる問題があ
った。Accordingly, the reaction force -F ₁ radiation power of the sound of the speaker 3 speaker box 1 receives, but because the speaker device smaller weight W is small and light, the reaction force -F
₁ to swing the speaker box 1
There is a problem that the radiated power is weakened and the sound quality is deteriorated.

【００１３】この様な問題を解決するために、例えば特
開昭６３−２１２０００号公報にはスピーカの振動板の
反作用力方向に加振する様に背面を互に対向させて配設
した加振器或は電気・振動トランスデューサによって、
反作用力をキャンセルさせる様に成したスピーカ装置も
提案されている。In order to solve such a problem, for example, Japanese Unexamined Patent Application Publication No. 63-212000 discloses a vibrator in which the rear faces are arranged so as to vibrate in the direction of a reaction force of a diaphragm of a speaker. By a vessel or electric / vibration transducer
A speaker device that cancels a reaction force has also been proposed.

【００１４】然し、上述の構成によると、スピーカ３と
略同一構成の加振器或は電気・振動トランスデューサを
必要とし、高価になるだけでなく、大型化し、小型軽量
なスピーカ装置として適さないだけでなく、スピーカの
音放射力に対する反作用力の打消方向は後面板方向に限
定されてしまうので、スピーカボックス１の上下、左右
方向等を安定化させることが困難となる問題が生ずる。However, according to the above-described configuration, a vibrator or an electric / vibration transducer having substantially the same configuration as that of the speaker 3 is required, which is not only expensive but also unsuitable as a large, small and lightweight speaker device. In addition, since the direction in which the reaction force against the sound radiation force of the speaker is canceled out is limited to the direction of the rear panel, there is a problem that it is difficult to stabilize the speaker box 1 in the vertical and horizontal directions.

【００１５】更に、加振器をスピーカに付加し、図１５
Ａに説明したと同様の位相反転型スピーカ装置とした場
合でも図１５Ａに示す様なダクトの開口を介しての放射
力Ｆ_D1に対する反作用力−Ｆ_D1が働き、スピーカボック
ス１を揺動させる原因を除去することが出来ない問題が
生ずる。Further, an exciter is added to the speaker, and FIG.
Reaction force -F _D1 acts against radiation force F _D1 through the duct opening of such as shown in FIG. 15A even when the same phase inversion type speaker apparatus as that described in A, caused to swing the speaker box 1 A problem arises that cannot be removed.

【００１６】更に、スピーカボックスの内容積が少ない
ため、スピーカ３の最低共振周波数ｆ₀ が上昇してしま
う。この上昇度合はスピーカボックスの容積が小さくな
ればなる程、大きくなる為に低音域の豊かな再生が困難
になる問題があった。Further, since the internal volume of the speaker box is small, the lowest resonance frequency f ₀ of the speaker 3 increases. As the volume of the speaker box becomes smaller, the degree of the increase becomes larger, so that there is a problem that it becomes difficult to richly reproduce the low frequency range.

【００１７】本発明は、叙上の問題を解消したスピーカ
装置を提供しようとするものであり、発明が解決しよう
とする課題はスピーカの音放射力の反作用力をスピーカ
ボックス内に配設した音道で抑制或は相殺させ、スピー
カの放音方向に対して、スピーカボックスの上下、左右
方向にも揺動の安定化が可能で低域共振周波数の上昇を
防止して、音質改善されたスピーカ装置を得ようとする
ものである。An object of the present invention is to provide a loudspeaker device which solves the above-mentioned problems, and a problem to be solved by the present invention is to provide a loudspeaker in which a reaction force of a sound radiation force of a loudspeaker is disposed in a loudspeaker box. A speaker whose sound quality is improved by suppressing or canceling in the road, stabilizing the swing in the vertical and horizontal directions of the speaker box with respect to the sound emission direction of the speaker, and preventing the rise of the low-band resonance frequency. To get the device.

【００１８】[0018]

【課題を解決するための手段】本発明はスピーカボック
スのバッフル板に穿ったスピーカ放音孔と対向して配設
されて音放射を行なうスピーカと、スピーカボックス内
に配設され、スピーカの音放射力と逆向きに空気を通過
させる音道とを具備し、この音道を通過する逆向きの空
気の放射力の反作用力により、スピーカの音放射力の反
作用力を抑制又は減衰させる様に成したことを特徴とす
るスピーカ装置としたものである。According to the present invention, there is provided a speaker which emits sound by being arranged opposite to a speaker sound emission hole formed in a baffle plate of a speaker box, and a speaker which is arranged in the speaker box and emits sound of the speaker. A sound path that allows air to pass in the opposite direction to the radiation force is provided, and the reaction force of the sound radiation force of the speaker is suppressed or attenuated by the reaction force of the radiation force of the air flowing in the opposite direction passing through this sound path. This is a speaker device characterized in that it has been achieved.

【００１９】斯る、構成のスピーカ装置によればスピー
カボックス内のスピーカ前面より音が放射されると、そ
の放射力の反作用力がスピーカの背面方向に働くが、ス
ピーカボックス内に配設した音道を介してスピーカボッ
クス内の空気が流出入した時に生ずる空気の放射力の反
作用力によってスピーカの音放射力の反作用力を相殺或
は減衰させることが出来る。更にスピーカボックス内に
配設した小容量のキャビティの容積をスピーカの音放射
時のスピーカボックス内の空気の変動分を吸収する様に
選択して、スピーカの最低共振周波数ｆ₀ の上昇を抑制
可能なスピーカ装置を得ることが出来る。According to the speaker device having such a configuration, when sound is radiated from the front surface of the speaker in the speaker box, the reaction force of the radiated force acts on the rear surface of the speaker, but the sound arranged in the speaker box. The reaction force of the sound radiation force of the speaker can be canceled or attenuated by the reaction force of the radiation force of air generated when air in the speaker box flows out and in through the road. Furthermore by selecting the volume of the cavity of the small volume that is disposed in the speaker box so as to absorb the variation of the air in the speaker box at the time of sound emission of the speaker, it can suppress an increase in the lowest resonance frequency f ₀ of the speaker A simple speaker device can be obtained.

【００２０】[0020]

【発明の実施の形態】以下、本発明のスピーカ装置の構
成を図面を参照して詳記する。図１は本例の１形態に係
るスピーカの側断面図を示すものであり、図１５Ａ，Ｂ
との対応部分には同一符号を付して示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a speaker device according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side sectional view of a speaker according to one embodiment of the present example, and FIGS.
Corresponding parts are denoted by the same reference numerals.

【００２１】図１に於いて、スピーカボックス１はＡＢ
Ｓ等の合成樹脂により小型軽量の箱型に成型されてい
る。スピーカボックス１は前面側にはバッフル板２Ｆが
設けられ、このバッフル板２Ｆの上側にはスピーカ取付
孔２ａが穿たれ、その内側に図１５で説明したと同一構
成のスピーカ３が配設されている。In FIG. 1, the speaker box 1 is AB
It is molded into a small and lightweight box shape using a synthetic resin such as S. The speaker box 1 is provided with a baffle plate 2F on the front side, a speaker mounting hole 2a formed in the upper side of the baffle plate 2F, and a speaker 3 having the same configuration as that described with reference to FIG. I have.

【００２２】スピーカボックス１はバッフル板２Ｆと対
向配置された後面板２Ｂと、バッフル板２Ｆの上下、左
右から後方に延設された天板２Ｕ及び底板２Ｄ並びに左
側板２Ｌ及び右側板２Ｒによって直方体状に構成され、
図１５Ａ，Ｂと同様にスピーカ３の下側には位相反転用
の第１のダクト１８及びダクト開口１８ａがバッフル板
２Ｆと一体に成型されている。The loudspeaker box 1 has a rectangular parallelepiped formed by a rear plate 2B opposed to the baffle plate 2F, a top plate 2U and a bottom plate 2D, and a left plate 2L and a right plate 2R extending rearward from above, below, right and left of the baffle plate 2F. Is configured into a shape
As in FIGS. 15A and 15B, a first duct 18 for phase inversion and a duct opening 18a are formed integrally with the baffle plate 2F below the speaker 3.

【００２３】又、後面板２Ｂには第１のダクト１８より
ダクト径の大きい第２のダクト１８ｂを第１のダクト１
８の所定長さ内でオーバーラップし、且つ同心円状断面
を持つ様に形成され、後面板２Ｂと一体に植立させ、第
２のダクト１８ｂの開口１８ｃを通して第１のダクト１
８の開口１８ａに放射する空気の等価質量Ｍ_D 及び等価
抵抗Ｒ_D を大きくしている。A second duct 18b having a larger diameter than the first duct 18 is provided on the rear plate 2B.
8 is formed so as to overlap and have a concentric cross section within a predetermined length of the first duct 1 through the opening 18c of the second duct 18b.
And to increase the equivalent mass M _D and the equivalent resistance R _D of the air radiating 8 of the opening 18a.

【００２４】上述の構成のスピーカ装置では第１のダク
ト１８及び第２のダクト１８ｂ間のダクト放射力Ｆ_D1及
びＦ_D2の反作用力−Ｆ_D1及び−Ｆ_D2は互に相殺されてバ
ランスされるのでスピーカボックス１内ではスピーカ３
の音放射力Ｆ₁ の反作用力−Ｆ₁ のみを考えればよい。[0024] In the above configuration of the speaker is balanced each other are canceled out reaction forces -F _D1 and -F _D2 ducts radiation force F _D1 and F _D2 between the first duct 18 and second duct 18b Therefore, the speaker 3 in the speaker box 1
Reaction forces of the sound radiation force F ₁ -F may be considered the only _one.

【００２５】本例ではスピーカ３の背面に音道２５を形
成するためにスピーカ３を囲繞する様に空洞部２４を形
成する。即ちバッフル板２Ｆと一体に成型され、スピー
カ３の後方が開放され、上下左右を囲繞する略立方体状
の枠部材２６と、この枠部材２６を覆う様にバッフル板
２Ｆから後方が開口とされ上下左右に延設されたケーシ
ング枠２７と、このケーシング枠２７の上下或は必要に
応じて左右に透孔２８を穿ち、ケーシング枠２７の開口
をパッシブラジェータ２９を中心部に配設したケーシン
グ後面板３０で塞ぐ様に固着する。In this embodiment, a cavity 24 is formed so as to surround the speaker 3 in order to form a sound path 25 on the back of the speaker 3. That is, the speaker 3 is formed integrally with the baffle plate 2F, the rear of the speaker 3 is opened, and a substantially cubic frame member 26 surrounding the top, bottom, left and right, and the rear is opened from the baffle plate 2F so as to cover the frame member 26, A casing frame 27 extending left and right, and a casing rear plate in which a through hole 28 is formed in the top and bottom of the casing frame 27 or left and right as required, and an opening of the casing frame 27 is provided with a passive radiator 29 in the center. It is fixed to close with 30.

【００２６】パッシブラジェータ２９は振動部２９ａと
ケーシング後面板３０との間にエッジ２９ｂを介在させ
てケーシング後面板３０に対して揺動自在と成されてい
る。The passive radiator 29 is swingable with respect to the casing rear plate 30 with an edge 29b interposed between the vibrating portion 29a and the casing rear plate 30.

【００２７】バッフル板２Ｆからスピーカボックス１内
に延設した枠部材２６の上下左右の側板とケーシング枠
２７の上下左右の側板間には空隙が作られて音道２５を
形成すると共にケーシング枠２７とケーシング後面板３
０で囲まれた小容積を有する空洞部２４が形成されてい
る。A space is formed between the upper, lower, left and right side plates of the frame member 26 extending from the baffle plate 2F into the speaker box 1 and the upper, lower, left and right side plates of the casing frame 27 to form the sound path 25 and the casing frame 27. And casing rear plate 3
A cavity 24 having a small volume surrounded by 0 is formed.

【００２８】斯る構成により、端子１３ａよりスピーカ
３の端子１５に音声信号を入力すると、スピーカ３の振
動板１０を介して図１に示す様に放射力Ｆ₁ で放音が成
される。[0028] By斯Ru configuration, when the input audio signal to the terminal 15 of the speaker 3 from the terminal 13a, the sound output is made in radiation force F ₁ as shown in FIG. 1 via the vibration plate 10 of the speaker 3.

【００２９】この時、上述の音放射力Ｆ₁ と逆向きの反
作用力−Ｆ₁ が生じ、スピーカボックス１に、この反作
用力−Ｆ₁ の方向、即ち、パッシブラジェータ２９方向
に力が働く、この時パッシブラジェータ２９は音放射力
Ｆ₁ の反作用力−Ｆ₁ で空洞部２４を膨張させる様なＦ
_P1方向の力が働く。従って、このＦ_P1の反作用力−Ｆ_P1
は音放射力Ｆ₁ の反作用力−Ｆ₁ を打ち消す様に働く。[0029] At this time, cause reaction force -F ₁ sound radiation force F ₁ in the opposite direction from above, the speaker box 1, the direction of the reaction force -F _1, i.e., the force acts on the passive La Jay data 29 direction, at this time, passive La Jay data 29 is such as to inflate the cavity 24 in the reaction force -F ₁ of sound radiation force F ₁ F
Force in _P1 direction works. Therefore, the reaction force of this F _P1 −F _P1
Works as counteract the reaction force -F ₁ of sound radiation force F _1.

【００３０】更に、空洞部２４内の空気は圧縮、膨張を
繰り返す。即ち、振動板１０が駆動されて、Ｆ₁ 方向に
動かされた時には空洞部２４内の空気は膨張するため、
ケーシング枠２７の上下又は左右に穿った透孔を介して
スピーカボックス１の大容積の空気が矢印３１で示す様
に音道２５内に流入する。この時に音道２５ではこの音
道２５を通る空気の等価質量をＭ_S 、音道を通る空気の
加速度をα_S とするとＦ_D3＝Ｍ_S ・α_S の放射力が働
き、音放射力Ｆ₁ を相殺又は減衰させる方向の放射力と
なる。この際、当然Ｆ_D3の反作用力−Ｆ_D3も発生する。Further, the air in the cavity 24 repeats compression and expansion. That is, the vibration plate 10 is driven, for inflating the air in the cavity 24 when it is moved in the F ₁ direction,
A large volume of air in the speaker box 1 flows into the sound path 25 as shown by the arrow 31 through the through-holes drilled up and down or left and right of the casing frame 27. In sound passage 25 when the equivalent mass M _S of the air passing through the sound path 25, the acceleration of air through the sound path and alpha _S F _D3 = emittance of M _S · α _S works, sound radiation force F Radiation force in the direction to cancel or attenuate ₁ . At this time, also occur reaction force -F _D3 of course F _D3.

【００３１】今、通常の空気の気圧（１気圧）をＰと
し、スピーカボックス１内の空気の圧力（気圧）を
Ｖ_C 、ケーシング枠２７内の空洞部２４内の空気の圧力
（気圧）をＶ_CR、スピーカ３の振動板１０の面積を
Ｓ_P 、スピーカ３の振幅をＸ_P とすると、スピーカ３の
振動板１０が振動することで空洞部２４内の空気の圧力
変化分ΔＶ_CRは（１）式の様に求められる。 Now, let P be the pressure of the normal air (1 atm), V _{C be} the pressure of the air in the speaker box 1, and V _{C be} the pressure of the air in the cavity 24 in the casing frame 27. _Assuming that V _CR , the area of the diaphragm 10 of the speaker 3 is S _P , and the amplitude of the speaker 3 is X _P , the diaphragm 10 of the speaker 3 vibrates and the pressure change ΔV _CR of the air in the cavity 24 is ( It is obtained as in equation (1).

【００３２】この変化分ΔＶ_CRが透孔２８を介してスピ
ーカキャビネット１内の空気と連通しているのでスピー
カ３の駆動に伴って空洞部２４内に空気が上述の様に吸
収又は排出される様になる。Since the variation ΔV _CR communicates with the air in the speaker cabinet 1 through the through hole 28, the air is absorbed or exhausted into the cavity 24 as the speaker 3 is driven as described above. Looks like

【００３３】従って、スピーカの音放射力Ｆ₁ ＝Ｍ₀ ・
α₀ 及び反作用力−Ｆ₁ と音道２５内の音放射力Ｆ_D3＝
Ｍ_S ・α_S 及び反作用力−Ｆ_D3並びにパッシブラジェー
タ２９での放射力Ｆ_P1及び反作用力−Ｆ_P3との関係は次
の（２）式を満足させればよいことになる。勿論この場
合、スピーカボックス１内の第１及び第２のダクト１８
及び１８ｂは互にその空気の放射力を支え合っているも
のとする。 Ｆ₁ ＋（−Ｆ_P1）≒Ｆ_D3＋Ｆ_P1‥‥（２）Therefore, the sound radiation force of the speaker F ₁ = M _0.
α ₀ and reaction force −F ₁ and sound radiation force F _D3 in sound path 25 =
The relationship between M _S · α _S and the reaction force −F _D3 and the radiation force F _P1 and the reaction force −F _P3 at the passive radiator 29 may satisfy the following expression (2). Of course, in this case, the first and second ducts 18 in the speaker box 1
And 18b mutually support the radiant power of the air. _{F 1 + (- F P1)} ≒ F D3 + F P1 ‥‥ (2)

【００３４】以上説明したように、この構成によれば、
スピーカボックス１内にスピーカ３の後面に音道２５と
空洞部２４を設ける事により、スピーカ３が音を放射す
るときに発生する反作用力−Ｆ₁ を抑制、または減少さ
せることにより、スピーカ３の音放射力が非常に良く発
揮でき、特に低音域での音質の劣化を防止することが可
能なスピーカ装置を提供できる。As described above, according to this configuration,
By providing a sound path 25 and a cavity 24 on the rear surface of the speaker 3 in the speaker box 1, the reaction force −F ₁ generated when the speaker 3 emits sound is suppressed or reduced, so that the speaker 3 It is possible to provide a speaker device that can exhibit sound radiation power very well and can prevent deterioration of sound quality particularly in a low-frequency range.

【００３５】図２Ａ，Ｂ乃至図４Ａ，Ｂ，Ｃは図１の音
道２５と空洞部２４の他の構成を示す要部の側断面図と
各図ＡのＡ−Ａ′断面矢視図を示すものである。FIGS. 2A, 2B to 4A, 4A, 4B, and 4C are side sectional views of main parts showing another configuration of the sound path 25 and the cavity 24 in FIG. It shows.

【００３６】図２Ａ，Ｂの場合は空洞部２４を形成する
ためのケーシング枠２７の上下方向にダクト３２を形成
し、更に図１のパッシブラジェータ２９を取り去ってケ
ーシング後面板３０のみとした場合である。図２Ａ，Ｂ
のダクト３２の口径はケーシング枠２７に穿った透孔２
８の直径に比べて小さく選択される。2A and 2B, a duct 32 is formed in the vertical direction of a casing frame 27 for forming the cavity 24, and the passive radiator 29 shown in FIG. 1 is removed to leave only the casing rear plate 30. is there. FIG. 2A, B
The diameter of the duct 32 is the through hole 2 formed in the casing frame 27.
8 is selected smaller than the diameter of 8.

【００３７】図２Ａ，Ｂの構成でのスピーカ３の音放射
力Ｆ₁ の反作用力−Ｆ₁ はＦ₁ ≒Ｆ_D3で互に支え合う様
に成り、ケーシング後面板３０は方向変換板として機能
する。又ダクト３２の放射時の空気の加速度をα₄ 、等
価質量をＭ₄ とした時にＦ_D4＝Ｍ₄ ・α₄ の作用力及び
反作用力−Ｆ_D4はスピーカボックス１の中心方向を支え
る様に成る。2A and 2B, the reaction force -F ₁ of the sound radiation force F ₁ of the loudspeaker 3 is supported by F ₁ ≒ F _D3 , and the casing rear plate 30 functions as a direction change plate. I do. The acceleration of the air at the time of radiation of the duct 32 alpha _4, the equivalent mass F _D4 = M ₄ · _{α 4} acting force and reaction force -F _D4 when the M ₄ is as support center of the speaker box 1 Become.

【００３８】図３Ａ，Ｂの場合は図２Ａ，Ｂと同様の目
的を達成する為の他の構成を示すものであり、本例では
ケーシング後面板３０に透孔又は角穴３３を穿ちスペー
サ３４を介して略合成樹脂等の正方形状の仕切板３５を
ビス等を介して螺着させた場合であり、この場合空気の
放射力Ｆ_D4によってスピーカボックス１の上下左右方向
が支えると共にスピーカボックス１の上下左右方向の揺
動を防止可能なものが得られる。FIGS. 3A and 3B show another configuration for achieving the same object as in FIGS. 2A and 2B. In this embodiment, a through hole or square hole 33 is formed in the casing rear plate 30 and a spacer 34 is formed. In this case, a square partition plate 35 of substantially synthetic resin or the like is screwed via screws or the like. In this case, the radiating force _{FD4 of the} air supports the speaker box 1 in the up-down and left-right directions, and the speaker box 1 Can be prevented from swinging in the vertical and horizontal directions.

【００３９】図４Ａ及び図４Ｂの場合は図４Ｂに示すＡ
−Ａ′断面矢視図の様にケーシング枠２７の上下左右に
透孔２８を穿って空洞部２４内への音道２５からの空気
流入出量を増大させる様に成したものである。FIGS. 4A and 4B show the case of A shown in FIG. 4B.
A through hole 28 is formed on the upper, lower, left and right sides of the casing frame 27 as shown in the sectional view taken along the line A-A 'to increase the amount of air flowing into and out of the cavity 24 from the sound path 25.

【００４０】図４Ｃは図４ＡのＡ−Ａ′断面矢視図を示
す他の構成例であり、図４Ｃの場合はケーシング枠２７
及びケーシング後面板３０を有底円筒状と成し、上下に
透孔２８を穿ったものである。勿論、この場合、枠部材
２６は円筒状に成されているので音道２５はサイクリッ
クな形状と成される。FIG. 4C is another example of the configuration showing a sectional view taken along the line AA 'of FIG. 4A. In the case of FIG.
The casing rear face plate 30 is formed in a cylindrical shape with a bottom, and a through hole 28 is formed vertically. Of course, in this case, since the frame member 26 is formed in a cylindrical shape, the sound path 25 is formed in a cyclic shape.

【００４１】図４Ａ及び図４Ｂの例では透孔２８の数を
ｎとするとｎ＝４であり、Ｆ₁ ≒（Ｆ_D3／４＋Ｆ_D3／４
＋Ｆ_D3／４＋Ｆ_D3／４）とし互に支え合ってスピーカ３
の音放射力Ｆ₁ の反作用力−Ｆ₁ を相殺或は減衰させる
ことが出来る。In the examples of FIGS. 4A and 4B, when the number of the through holes 28 is n, n = 4, and F ₁ ≒ (F _D3 / 4 + F _D3 / 4
+ F _D3 / 4 + F _D3 / 4)
Sound radiation force F ₁ of the reaction force -F ₁ it is possible to cancel or attenuate.

【００４２】図５は本発明の他の形態例を示すものであ
り、枠部材２６ａは頂部をドーム状と成し中心に透孔３
６を穿ち、図４Ｃと同様に円筒状と成され、スピーカ３
を後部から覆う様にバッフル板２Ｆに固定される。更に
このドーム状の円筒状の枠部材２６ａより直径の大きい
ドーム状の円筒状ケーシング３７によって枠部材２６ａ
を覆う様に囲繞させ、図４Ｃに示す様なサイクリックな
音道２５を形成する様にバッフル板２Ｆに固定すること
で空洞部２４と音道２５を形成する。FIG. 5 shows another embodiment of the present invention, in which a frame member 26a has a dome-shaped top and a through hole 3 at the center.
6 is formed into a cylindrical shape as in FIG.
Is fixed to the baffle plate 2F so as to cover from the rear. Further, the frame member 26a is formed by a dome-shaped cylindrical casing 37 having a diameter larger than that of the dome-shaped cylindrical frame member 26a.
The hollow portion 24 and the sound path 25 are formed by fixing to the baffle plate 2F so as to form a cyclic sound path 25 as shown in FIG. 4C.

【００４３】図５の構成に於いてもＦ₁ ≒Ｆ_D3の条件を
設定することで反作用−Ｆ₁ を相殺又は減衰可能であ
る。又、図５のダブルダクトは図１の場合と同様に−Ｆ
_D1≒Ｆ_D2で互に支え合ってダクト１８の開口１８ａから
の空気放射時の反作用力を互に相殺させているが、第１
のダクト１８を第２のダクト１８ｂの中心位置より下側
に偏芯させた位置に形成して第１及び第２のダクト１８
及び１８ｂ内のダクトの抵抗Ｒ_D を減少させる様に構成
させてある。In the configuration of FIG. 5, the reaction -F ₁ can be canceled or attenuated by setting the condition of F ₁ ≒ F _D3 . Also, the double duct of FIG.
_D1 ≒ F _D2 support each other to cancel each other out of the reaction force when the air is radiated from the opening 18a of the duct 18.
Duct 18 is formed at a position eccentric below the center position of the second duct 18b so that the first and second ducts 18
And 18b are configured to reduce the resistance R _D of the duct.

【００４４】図６Ａ，Ｂ及び図７Ａ，Ｂは図５の枠部材
２６ａとケーシング３７部分の要部の側断面図と図６Ａ
及び図７ＡのＢ−Ｂ′断面矢視図を示すものである。FIGS. 6A and 6B and FIGS. 7A and 7B are side sectional views of main parts of the frame member 26a and the casing 37 shown in FIG.
7B is a sectional view taken along the line BB ′ of FIG. 7A.

【００４５】図６Ａ，Ｂの構成に於いては、枠部材２６
ａはドーム状の円筒部を鉛直方向に切断した形状として
スピーカ３の上側を覆う様に、又は１点鎖線で示す様に
スピーカ３の下側をくるむ様に配設し、ドーム状に形成
したケーシング３７の上側又は下側に透孔２８を穿った
場合である。6A and 6B, the frame member 26
a is a dome-shaped cylinder formed by cutting the dome-shaped cylindrical portion in the vertical direction so as to cover the upper side of the speaker 3 or to surround the lower side of the speaker 3 as indicated by a dashed line. This is a case where the through hole 28 is formed on the upper side or the lower side of the casing 37.

【００４６】この場合もＦ₁ ≒Ｆ_D3でスピーカ３部分は
互に支え合う様に又、音道２５から空洞部２４内に流
入、或は空洞部２４から音道に流入する空気は上向き及
び下向きの放射力として動作するのでスピーカボックス
１の自重Ｗ（図５参照）にこれらの放射力が−Ｆ_D5では
加算され、Ｆ_D5では減算される様に働くことになる。The air flowing in this case the speaker 3 portions at F ₁ ≒ F _D3 also as mutually each other support, flows into the cavity 24 from the sound path 25, or from the cavity 24 to the sound path upwards and since operating as downward radiation force these radiation forces the weight of the speaker box 1 W (see FIG. 5) is added at -F _D5, will act as to be subtracted in F _D5.

【００４７】図７Ａ，Ｂの場合は枠部材２６ａ及びケー
シング３７のドーム部分を変更し、片屋根状にすること
で下側の音道２５ｂに比べて上側の音道２５ａの経路を
長くとる様に成した場合である。In the case of FIGS. 7A and 7B, the frame member 26a and the dome portion of the casing 37 are changed to have a single roof so that the path of the upper sound path 25a is longer than that of the lower sound path 25b. This is the case when

【００４８】図７Ａ，Ｂの構成ではケーシング３７の上
下に透孔２８を穿ち、更に、図７Ｂに示す様にケーシン
グ３７の左右に透孔２８Ｌ及び２８Ｒを穿つ様にしても
よい。この場合もＦ₁ ≒Ｆ_D3の釣合条件を満たす様にす
ればよい。In the configuration shown in FIGS. 7A and 7B, through holes 28 may be formed in the upper and lower portions of the casing 37, and further, as shown in FIG. 7B, through holes 28L and 28R may be formed in the left and right sides of the casing 37. In this case as well, the balance condition of F ₁ ≒ FD ₃ may be satisfied.

【００４９】上述の各種形態例によれば、スピーカ３の
振動板１０側から視て、スピーカ３を囲繞する３６０度
の全周或は全辺を音道２５とすることが可能となり、ス
ピーカ３の音放射力Ｆ₁ の反作用力−Ｆ₁ を音放射力Ｆ
₁ と逆向きに音道２５で発生させた空気の放射力Ｆ_D3で
相殺或は減衰させる様にしたので軽量なスピーカボック
ス１の揺動をスピーカ装置を１つのスピーカ３を用いる
だけで防止することが可能と成る。According to the various embodiments described above, when viewed from the diaphragm 10 side of the loudspeaker 3, the entire circumference or all sides of 360 degrees surrounding the loudspeaker 3 can be the sound path 25, and the loudspeaker 3 The reaction force of the sound radiation force F ₁ −F ₁ is the sound radiation force F
The vibration of the lightweight speaker box 1 is prevented by using only one speaker 3 so that the swinging of the lightweight speaker box 1 is prevented because the radiation force F _D3 of the air generated in the sound path 25 in the direction opposite to ₁ cancels or attenuates. It becomes possible.

【００５０】上述の各種構成例ではスピーカ３の背面を
囲繞する様に音道２５と空洞部２４を形成したが図８乃
至図１４でダクト１８内或はスピーカボックス１の後面
板２Ｂに空洞部２４を形成した構成を説明する。Although the sound path 25 and the hollow portion 24 are formed so as to surround the rear surface of the speaker 3 in the above-described various configuration examples, the hollow portion is formed in the duct 18 or the rear plate 2B of the speaker box 1 in FIGS. The configuration in which 24 is formed will be described.

【００５１】図８は空洞部２４を第１のダクト１８内に
同心的に配設させた場合である。この空洞部２４は略円
筒状で一方の開口が塞止されて、ダクト１８内径に空洞
部２４の外周から放射状（例えば１２０°間隔で）に延
設した輻部３８の先端を接合させて、片持支持或は両端
支持する様に成され、他方の開口には発泡性合成樹脂
（ウレタン）等の通気性抵抗材３９を挿通固定させてあ
る。FIG. 8 shows a case where the hollow portion 24 is arranged concentrically in the first duct 18. The hollow portion 24 is substantially cylindrical and one opening is closed, and the tip of a radial portion 38 extending radially (for example, at 120 ° intervals) from the outer periphery of the hollow portion 24 to the inner diameter of the duct 18 is joined. A cantilever support or both ends are supported, and a breathable resistance material 39 such as a foamable synthetic resin (urethane) is inserted through and fixed to the other opening.

【００５２】この図８に於いて、スピーカ装置２０の自
重をＷとし、スピーカボックス１と載置部との間の摩擦
抵抗をＲとすれば、スピーカ３を駆動した時に軽量なス
ピーカボックス１を揺動させずにスピーカ３の反作用力
−Ｆ₁ を相殺或は減衰させる条件式はＦ₁ ＋Ｆ_D1＋Ｆ_D3
＝（Ｆ₁ ＋Ｆ_D1＋Ｆ_D3）Ｒ＋ＷＲとすればよい。In FIG. 8, if the own weight of the speaker device 20 is W and the frictional resistance between the speaker box 1 and the mounting portion is R, the speaker box 1 which is lightweight when the speaker 3 is driven can be used. condition to cancel or attenuate the reaction force -F ₁ loudspeaker 3 without swinging F ₁ + F _D1 + F _D3
= (F ₁ + F _D1 + F _D3 ) R + WR.

【００５３】今、図８の構成で図１５と同様にスピーカ
ボックス１内のスチフネスをＳ_C とし、スピーカ３の振
動系のスチフネスをＳ₀ とすると、総合のスチフネスＳ
_t はＳ_t ＝Ｓ_C ＋Ｓ₀ であって、スピーカの振動系のス
チフネスＳ₀ はスピーカキャビネット１のスチフネスＳ
_C 分だけ上昇する。従って、スピーカ３の最低共振周波
数ｆ₀ は当然上昇することになる。Now, assuming that the stiffness in the speaker box 1 is S _C and the stiffness of the vibration system of the speaker 3 is S _{0 in} the configuration of FIG.
_t is S _t = S _C + S ₀ , and the stiffness S ₀ of the speaker vibration system is the stiffness S of the speaker cabinet 1.
_It rises by _C minutes. Therefore, the lowest resonance frequency f ₀ of the speaker 3 naturally rises.

【００５４】ここで、スピーカ３の振動板１０の有効面
積をａとし、音放射時に振動板１０がＦ₁ 或は−Ｆ₁ 方
向の片側に動く最大振幅をｄとすると、スピーカボック
ス１内で変化する空気の容積ΔＶ_CRは（１）式で表せる
が、このΔＶ_CRはΔＶ_CR≒ａ・ｄとなる。Here, assuming that the effective area of the diaphragm 10 of the speaker 3 is a and the maximum amplitude of the diaphragm 10 moving to one side in the F ₁ or −F ₁ direction at the time of sound emission is d, the inside of the speaker box 1 The changing air volume ΔV _CR can be expressed by the following equation (1), and this ΔV _CR becomes ΔV _CR ≒ ad.

【００５５】従って、図８で示す空洞部２４の空気の容
積を、この変化する空気の容積ΔＶ_CR以上にとってＶ_CR
≧ａ・ｄとすれば、スピーカ３の駆動時のこの変化分Δ
Ｖ_CRを空洞部２４で吸収或は放出することが出来る。こ
の時に通気性抵抗材３９を介して吸収或は放出される空
気によってＦ_D3及び−Ｆ_D3の放射力が生ずる。これを上
述の様に音放射力Ｆ₁ と釣合せればよい。又、空洞部２
４内に流出入する空気の変化分ΔＶ_CRを空洞部２４内に
吸収或は放出することでスチフネスＳ_C の上昇が抑えら
れ、スピーカ３の振動系の最低共振周波数ｆ₀ の上昇も
抑制可能となる。勿論、この時にはスピーカボックス１
の空気の容積と空洞部２４の空気を分離するためにある
程度空気抵抗のある通気性抵抗材３９を必要とする。[0055] Thus, the air volume of the cavity 24 shown in FIG. 8, V _CR taken over the volume [Delta] V _CR of air this change
If ≧ ad, this change Δ when the speaker 3 is driven is
V _CR a can be absorbed or released in the cavity 24. Radiation force F _D3 and -F _D3 is caused by air that is absorbed or released through the ventilation resistance material 39 at this time. This may, combined sound radiation force F ₁ and the fishing as described above. The cavity 2
By absorbing or releasing the change ΔV _CR of the air flowing into and out of the cavity 4 into the cavity 24, the rise in the stiffness S _C is suppressed, and the rise in the minimum resonance frequency f ₀ of the vibration system of the speaker 3 can also be suppressed. Becomes Of course, at this time, speaker box 1
In order to separate the volume of air from the air in the cavity 24, a breathable resistance member 39 having a certain air resistance is required.

【００５６】図９Ａ，Ｂは図８のダクト部分の側断面図
とダクトの開口側から視た他の構成図であり、本例では
ミクロングラスの様な通気性抵抗材３９を空洞部２４内
に充填させた場合で、空洞部２４内の等価抵抗Ｒ_D2は大
きくなるのでスピーカ３の共振鋭度Ｑ₀ は小さくなるが
スピーカ３の最低共振周波数ｆ₀ は下がる様に成る。FIGS. 9A and 9B are a side sectional view of the duct portion shown in FIG. 8 and another configuration diagram viewed from the opening side of the duct. In this example, a gas permeable resistance material 39 such as micron glass is provided inside the hollow portion 24. In this case, the equivalent resistance R _D2 in the cavity 24 increases, so that the resonance sharpness Q ₀ of the speaker 3 decreases, but the lowest resonance frequency f ₀ of the speaker 3 decreases.

【００５７】図１０は本発明のスピーカ装置の更に他の
構成を示す側断面図を示すものであり、本例ではスピー
カボックス１の底板２Ｄ近傍のバッフル板２Ｆ、左右側
板２Ｌ及び２Ｒ、後面板２Ｂで囲まれた４辺と、底板２
Ｄと平行に配設した仕切板４１で構成した空洞部２４の
仕切板４１のバッフル板２Ｆ寄りに透孔４０を穿ち、同
じくバッフル板２Ｆに延設した位相反転用のダクト１８
と仕切板４１間に通気性抵抗材３９を充填させ、ダクト
１８の後面とスピーカボックス１の後面板２Ｂ間に形成
される通気開口４２を介してスピーカボックス１内の空
気と空洞部２４の空気を連通させる様にしたもので、こ
の場合、通気性抵抗材３９は仕切板４１と同一面積に略
正方形状に形成されているため通気開口４２はダクト１
８の左右端にも形成されている。FIG. 10 is a side sectional view showing still another configuration of the speaker device of the present invention. In this embodiment, a baffle plate 2F near the bottom plate 2D of the speaker box 1, left and right side plates 2L and 2R, a rear plate 4 sides surrounded by 2B and bottom plate 2
A hole 40 is formed near the baffle plate 2F of the partition plate 41 of the hollow portion 24 formed of the partition plate 41 arranged in parallel with the hole D, and the phase inversion duct 18 also extended to the baffle plate 2F.
And the partition plate 41 are filled with the air-permeable resistance material 39, and the air in the speaker box 1 and the air in the cavity 24 are formed through the ventilation opening 42 formed between the rear surface of the duct 18 and the rear surface plate 2 </ b> B of the speaker box 1. In this case, since the permeable resistance member 39 is formed in a substantially square shape in the same area as the partition plate 41, the ventilation opening 42 is provided in the duct 1
8 are also formed at the left and right ends.

【００５８】図１０の場合も図８及び図９で述べたと同
様の条件でスピーカのｆ₀ を下げ、スピーカの揺動を防
止可能となる。[0058] lowering the f ₀ of the speaker under the same conditions as also described in FIGS. 8 and 9 in the case of FIG. 10, it is possible to prevent oscillation of the speaker.

【００５９】図１１は本発明のスピーカ装置の更に他の
構成を示す側断面図を示すものでスピーカボックス１の
底板２Ｄ近傍に図１０と同様に空洞部２４を形成し、仕
切板４１のバッフル板２Ｆ近傍に穿った透孔４０の近傍
に通気性抵抗材３９を配設する様に成し、ダクト１８を
スピーカボックス１の後面板１Ｂ側から延設し、後面板
１Ｂにダクトの開口１８ａを穿つ様に成されている。FIG. 11 is a side sectional view showing still another configuration of the speaker device according to the present invention. A cavity 24 is formed near the bottom plate 2D of the speaker box 1 in the same manner as in FIG. The duct 18 extends from the rear plate 1B side of the speaker box 1, and a duct opening 18a is formed in the rear plate 1B in the vicinity of the through hole 40 formed near the plate 2F. It is made to wear.

【００６０】図１１の構成では後面板２Ｂに穿ったスピ
ーカ放音孔２ｂに対向してスピーカ３と同一構成のスピ
ーカ３ａを更に、背中合わせに対向配置し、スピーカ３
とスピーカ３ａの音放射力Ｆ₁ 及びＦ₂ の反作用力−Ｆ
₁ 及び−Ｆ₂ を互にキャンセルさせると共に、スピーカ
３ａのスピーカ放音孔２ｂから放音させる音をバッフル
板２Ｆ側に導出するための放音案内板４３をスピーカ放
音孔２ｂの前面から天板２Ｕ並びに左右側板２Ｌ及び２
Ｒの１部に渡って形成する。同様にダクト１８の開口１
８ａの前面及びスピーカボックス１の底板２Ｄ並びに左
右側板２Ｌ及び２Ｒの１部を覆う様にダクト案内板４４
を形成し、スピーカ３ａ及びダクト１８の放射音をバッ
フル板２Ｆ側に放音させると共に空洞部２４の通気性抵
抗材３９近傍に形成した開口４０で空気の放射力Ｆ_D3及
び−Ｆ_D3を形成させる様に成している。In the configuration shown in FIG. 11, a speaker 3a having the same configuration as the speaker 3 is further disposed to face the speaker sound emission hole 2b formed in the rear panel 2B back to back.
Sound radiation force between the speaker 3a F ₁ and F ₂ of the reaction force -F
Together to each other cancel ₁ and -F _2, heaven sound guide plate 43 for leading a sound to be emitted from the speaker sound emission hole 2b of the speaker 3a to the baffle plate 2F side from the front of the speaker sound emission hole 2b Plate 2U and left and right side plates 2L and 2
It is formed over a part of R. Similarly, the opening 1 of the duct 18
8a and the duct guide plate 44 so as to cover the bottom plate 2D of the speaker box 1 and a part of the left and right side plates 2L and 2R.
Forming a forming a radiation force F _D3 and -F _D3 of the air in the speaker 3a and the opening 40 formed in the vicinity of the ventilation resistance material 39 of the cavity 24 causes the sound to the baffle plate 2F side noise radiation duct 18 It is made to make it.

【００６１】図１２及び図１３は本発明のスピーカ装置
の更に他の側断面図であり、これら図１２及び図１３の
場合はダクト１８を２重構成として、ダクト長を長くす
る為にスピーカ３の背面の後面板２Ｂにダクト１８を延
設したものであり、更に図８と同様に空洞部２４をダク
ト１８内に同心的に配設させたものである。FIGS. 12 and 13 are still another side sectional view of the speaker device according to the present invention. In the case of FIGS. 12 and 13, the duct 18 has a double structure, and the speaker 3 has a large length. A duct 18 is extended from the rear surface plate 2B of the rear surface of the second embodiment, and a cavity 24 is concentrically arranged in the duct 18 similarly to FIG.

【００６２】図１２及び図１３でのダクト１８は後面板
２Ｂからスピーカボックス１内に延設した３重筒構造の
管の外側及び内側の管の長さを中側の管の長さより長く
延設し、外側と内側の管の開口部を塞止する様に成し、
このダクト１８の後面板１Ｂ寄り外側の管の上下に透孔
４５を穿つ様に成したものである。The duct 18 in FIGS. 12 and 13 extends the length of the outer and inner tubes of the triple tube structure tube extending from the rear plate 2B into the speaker box 1 longer than the length of the middle tube. To close the openings of the outer and inner pipes,
A through hole 45 is formed above and below the outer tube near the rear plate 1B of the duct 18.

【００６３】この透孔４５及び４５から流出入する空気
は外側の管と中側の管の間及び中側の間と内側の管の間
を通って中側及び内側の管の間に穿ったリング状の透孔
４６を通して排出或は吸入される。The air flowing in and out of the through holes 45 and 45 passes between the outer tube and the middle tube and between the middle and inner tubes, and penetrates between the middle and inner tubes. The gas is discharged or sucked through the ring-shaped through hole 46.

【００６４】更に、空洞部２４を形成するために図１２
の場合はダクト１８の塞止端の中央部分に内側の管内径
と同一径の透孔４７を穿ち、透孔４７近傍に通気性抵抗
材３９を配設した場合であり、空洞部２４の透孔４７で
空気放射力Ｆ_D3及び−Ｆ_D3を得る様にしている。Further, in order to form the cavity 24, FIG.
In the case (1), a through hole 47 having the same diameter as the inner diameter of the inner pipe is formed in the center of the closed end of the duct 18, and a gas permeable resistance material 39 is provided near the through hole 47. and the manner obtain radiant force F _D3 and -F _D3 in the hole 47.

【００６５】図１３の場合はダクト１８の塞止端の中央
部に通気性抵抗に代わって細孔４８を穿ち、通気性抵抗
材３９を配設させない場合である。In the case of FIG. 13, a hole 48 is formed in the center of the closed end of the duct 18 instead of the air-permeable resistance, and the air-permeable resistance material 39 is not provided.

【００６６】図１３では更に、必要にスピーカ３をケー
シング４９で囲繞し、ケーシング４９の所定位置に透孔
５０を穿つことでスピーカ３への過振幅入力に対して強
力に対応出来る様に成されている。In FIG. 13, the speaker 3 is further surrounded by a casing 49 if necessary, and a through hole 50 is formed at a predetermined position of the casing 49 so that an excessive amplitude input to the speaker 3 can be strongly supported. ing.

【００６７】即ち、ケーシング４９に穿った透孔部分の
等価質量をＭ_D1とし、ケーシング４９内のスチフネスを
Ｓ_D1とし、ケーシング内の圧力をＶ_D1とすれば で表せ、この式からＳ_D1が小さくなり分母にＭ_D1を持つ
ことで、スピーカ３には容積負荷が掛かることで過大入
力に強い構成となる。That is, if the equivalent mass of the through-hole portion formed in the casing 49 is M _D1 , the stiffness in the casing 49 is S _D1, and the pressure in the casing is V _D1. From this equation, S _D1 becomes smaller and M _D1 is provided in the denominator, so that a volume load is applied to the loudspeaker 3 so that the speaker 3 has a configuration resistant to excessive input.

【００６８】本発明の上述の図８乃至図１３の構成のス
ピーカ装置の等価回路は図１５Ｂの従来構成の等価回路
で示すスピーカボックス１のスチフネスＳ_C に空洞部２
４内のスチフネスＳ_C1が並列に加わり、通気性抵抗材３
９の音響抵抗分がスピーカの振動系に直列に加わり図１
４に示す様に表すことが出来る。尚、図１４で図１５Ｂ
との対応部分には同一符号を付して示してあり、Ｍ_DRは
ダクト１８の空気の放射質量である。[0068] Equivalent circuit of the above configuration of the speaker apparatus shown in FIGS. 8 to 13 of the present invention the cavity 2 in the stiffness S _C of the speaker box 1 shown in the equivalent circuit of the conventional arrangement of FIG. 15B
4. The stiffness S _{C1 in FIG.}
9 is added in series to the vibration system of the loudspeaker.
It can be expressed as shown in FIG. It should be noted that FIG.
Corresponding parts are denoted by the same reference numerals, and M _DR is the radiation mass of air in the duct 18.

【００６９】[0069]

【発明の効果】本発明のスピーカ装置によればスピーカ
ボックス内に空洞部と音道を設け、音道又は空洞部から
放射される空気の力の反作用力でスピーカの音放射力の
反作用力を相殺或は減衰することが出来るので低域の放
射力が拡大出来、スピーカボックスの上下、左右前後へ
の揺動が防止出来ると共に小空洞部をスピーカボックス
内に配設することでスピーカの最低共振周波数の上昇を
防止可能なスピーカ装置が得られる。According to the speaker apparatus of the present invention, a cavity and a sound path are provided in the speaker box, and the reaction force of the sound radiation force of the speaker is reduced by the reaction force of the air force radiated from the sound path or the cavity. Since it can cancel or attenuate, the radiated power in the low range can be expanded, the swinging of the speaker box up and down, right and left and front and back can be prevented, and the minimum resonance of the speaker can be prevented by disposing the small cavity in the speaker box. A speaker device capable of preventing an increase in frequency can be obtained.

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

【図１】本発明のスピーカ装置の側断面図である。FIG. 1 is a side sectional view of a speaker device of the present invention.

【図２】本発明のスピーカ装置の要部の側断面図及びＡ
−Ａ′断面矢視図（Ｉ）である。FIG. 2 is a side sectional view of a main part of the speaker device of the present invention and FIG.
FIG. 3 is a sectional view (I) taken along a line A-A ′.

【図３】本発明のスピーカ装置の要部の側断面図及びＡ
−Ａ′断面矢視図（II）である。FIG. 3 is a side sectional view of a main part of the speaker device of the present invention and FIG.
FIG. 2 is a sectional view taken along the line A-A ′ (II).

【図４】本発明のスピーカ装置の要部の側断面図及びＡ
−Ａ′断面矢視図（III ）である。FIG. 4 is a side sectional view of a main part of the speaker device of the present invention and FIG.
FIG. 3B is a sectional view taken along the line A-A (III).

【図５】本発明の他のスピーカ装置の側断面図である。FIG. 5 is a side sectional view of another speaker device of the present invention.

【図６】本発明のスピーカ装置の要部の側断面図及びＢ
−Ｂ′断面矢視図（Ｉ）である。FIG. 6 is a side sectional view of a main part of the speaker device of the present invention and FIG.
FIG. 4B is a sectional view taken along the arrow B ′ (I).

【図７】本発明のスピーカ装置の要部の側断面図及びＢ
−Ｂ′断面矢視図（II）である。FIG. 7 is a side sectional view of a main part of the speaker device of the present invention, and FIG.
FIG. 2B is a sectional view taken along the arrow B ′ (II).

【図８】本発明の更に他のスピーカ装置の側断面図
（Ｉ）である。FIG. 8 is a side sectional view (I) of still another speaker device of the present invention.

【図９】本発明のダクト内の空洞部の他の構成図であ
る。FIG. 9 is another configuration diagram of the hollow portion in the duct of the present invention.

【図１０】本発明の更に他のスピーカ装置の側断面図
（II）である。FIG. 10 is a side sectional view (II) of still another speaker device of the present invention.

【図１１】本発明の更に他のスピーカ装置の側断面図
（III ）である。FIG. 11 is a side sectional view (III) of still another speaker device of the present invention.

【図１２】本発明の更に他のスピーカ装置の側断面図
（IV）である。FIG. 12 is a side sectional view (IV) of still another speaker device of the present invention.

【図１３】本発明の更に他のスピーカ装置の側断面図
（Ｖ）である。FIG. 13 is a side sectional view (V) of still another speaker device of the present invention.

【図１４】本発明のスピーカ装置の等価回路図である。FIG. 14 is an equivalent circuit diagram of the speaker device of the present invention.

【図１５】従来のスピーカ装置の側断面図及び電気的等
価回路図である。FIG. 15 is a side sectional view and an electrical equivalent circuit diagram of a conventional speaker device.

【符号の説明】[Explanation of symbols]

１‥‥スピーカボックス、３‥‥スピーカ、１８，１８
ａ‥‥ダクト、２４‥‥空洞部、２５‥‥音道、３９‥
‥通気性抵抗材1 ‥‥ speaker box, 3 ‥‥ speaker, 18, 18
a ‥‥ duct, 24 ‥‥ cavity, 25 ‥‥ sound path, 39 ‥
‥ Breathable resistance material

───────────────────────────────────────────────────── フロントページの続き (72)発明者 投野 耕治 東京都品川区北品川６丁目７番35号 ソニ ー株式会社内 (72)発明者 角田 直隆 東京都品川区北品川６丁目７番35号 ソニ ー株式会社内 (72)発明者 関 英木 東京都品川区北品川６丁目７番35号 ソニ ー株式会社内 (72)発明者 篠原 幾夫 東京都品川区北品川６丁目７番35号 ソニ ー株式会社内 (72)発明者 秋山 明広 東京都品川区北品川６丁目７番35号 ソニ ー株式会社内 (72)発明者 徳重 賢二 東京都品川区北品川６丁目７番35号 ソニ ー株式会社内 Ｆターム(参考） 5D017 AD12 5D018 AD01 AD18 AD26  ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koji Tono 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Naotaka Tsunoda 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo No. 72 within Sony Corporation (72) Hideki Seki 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Ikuo Shinohara 7-35, Kita-Shinagawa, Shinagawa-ku, Tokyo, Japan Inside Sony Corporation (72) Inventor Akihiro Akihiro 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Inside (72) Inventor Kenji Tokushige 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony F term in the company (reference) 5D017 AD12 5D018 AD01 AD18 AD26

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 スピーカボックスのバッフル板に穿った
スピーカ取付孔と対向して配設されたスピーカと、 上記スピーカボックス内に配設され、上記スピーカの音
放射力と逆向きに空気を通過させる音道とを具備し、 上記音道を通過する逆向きの空気の放射力の反作用力に
より、上記スピーカの音放射力の反作用力を抑制又は減
衰させて成ることを特徴とするスピーカ装置。A speaker disposed opposite to a speaker mounting hole formed in a baffle plate of the speaker box; and a speaker disposed in the speaker box for passing air in a direction opposite to a sound radiation force of the speaker. A speaker device comprising a sound path, wherein the reaction force of the sound radiation force of the speaker is suppressed or attenuated by the reaction force of the radiation force of air flowing in the opposite direction passing through the sound path. 【請求項２】 前記スピーカの背面に小容積の空間部を
設けて、該空間部に連通する前記音道を配設して成るこ
とを特徴とする請求項１記載のスピーカ装置。2. The speaker device according to claim 1, wherein a small-volume space is provided on the back of the speaker, and the sound path communicating with the space is provided. 【請求項３】 前記小容積の空間部を２重円筒状とし、
前記音道断面をサークル状に構成させて成ることを特徴
とする請求項２記載のスピーカ装置。3. The small volume space portion has a double cylindrical shape,
3. The speaker device according to claim 2, wherein the sound path section is formed in a circular shape. 【請求項４】 前記小容積の空間部の音道に通気性のあ
る空気抵抗部材を配設して成ることを特徴とする請求項
２又は請求項３記載のスピーカ装置。4. The speaker device according to claim 2, wherein an air resistance member having air permeability is provided in a sound path of the small volume space portion. 【請求項５】 前記スピーカボックスに配設した位相反
転型ダクト内に前記小容積の空間部を配設して成ること
を特徴とする請求項２乃至請求項４記載のスピーカ装
置。5. The speaker device according to claim 2, wherein the small-volume space portion is disposed in a phase inversion type duct disposed in the speaker box.