JPH1188987A - Inverted-dome type speaker - Google Patents
Inverted-dome type speakerInfo
- Publication number
- JPH1188987A JPH1188987A JP26504797A JP26504797A JPH1188987A JP H1188987 A JPH1188987 A JP H1188987A JP 26504797 A JP26504797 A JP 26504797A JP 26504797 A JP26504797 A JP 26504797A JP H1188987 A JPH1188987 A JP H1188987A
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- edge
- dome
- inverted
- dome type
- 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.)
- Granted
Links
Landscapes
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は音響機器の一種で
あるスピーカ、詳しくは振動板形状が背面側、つまり磁
気回路側に向って逆ドーム形状に湾曲形成された逆ドー
ム型スピーカに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker which is a kind of audio equipment, and more particularly to a dome-shaped loudspeaker in which a diaphragm is formed in an inverted dome shape toward a back side, that is, toward a magnetic circuit.
【０００２】[0002]
【従来の技術】従来、この種のスピーカは、例えば図８
に示すように構成されている。すなわち、図中５′は逆
ドーム型スピーカの振動板で、この逆ドーム型の振動板
５′は下方に突出しており、かつ外周部背面にはボイス
コイルボビン６が設けられているとともに、外周部は、
詳しくは図９に示すように、その接合部５ａ′にダウン
ロールエッジ７の内周部の接合部７ａが接着され、この
ダウンロールエッジ７の外周部はフレーム９側の取付部
８に接着されている。2. Description of the Related Art Conventionally, this kind of loudspeaker is, for example, shown in FIG.
It is configured as shown in FIG. That is, in the figure, reference numeral 5 'denotes a diaphragm of an inverted dome type speaker. The inverted dome type diaphragm 5' projects downward, and a voice coil bobbin 6 is provided on the rear surface of the outer peripheral portion. Is
More specifically, as shown in FIG. 9, a joining portion 7a on the inner peripheral portion of the down roll edge 7 is adhered to the joining portion 5a ', and the outer peripheral portion of the down roll edge 7 is adhered to the mounting portion 8 on the frame 9 side. ing.
【０００３】一般のコーン型スピーカは、振動板前面の
窪みによる前室効果のため、音圧特性に乱れが出来ると
いう欠点がある。また、平面型スピーカは振動板の剛性
を得るのが困難であるため、所望の高域特性が得られな
い、という欠点を有している。[0003] A general cone type speaker has a disadvantage that sound pressure characteristics can be disturbed due to a front chamber effect due to a depression on the front surface of the diaphragm. Further, the flat speaker has a drawback in that it is difficult to obtain the rigidity of the diaphragm, so that desired high-frequency characteristics cannot be obtained.
【０００４】また、逆ドーム型ではなく、振動板がドー
ム状となっているドーム型のスピーカもあり、このドー
ム型スピーカとしては、ハードドームとソフトドームタ
イプのものとがある。There is also a dome-shaped speaker having a dome-shaped diaphragm instead of an inverted dome-type, and the dome-shaped speaker includes a hard dome type and a soft dome type.
【０００５】すなわち、ハードドームのものは、ドーム
が金属やセラミック等のようにヤング率が高く、エッジ
部は布、ウレタン、及び、プラスチックフィルム等のよ
うにヤング率の比較的に低い材料を用いており、ドーム
部は形状と材質から得られる強度によりピストン運動の
範囲は広く取れ低い高調波歪みの特性が得られる。しか
し、エッジ部が逆共振を起こすために、高域特性にピー
クとディップが発生する欠点を持っている。また、この
ピーク・ディップを押さえるために、イコライザーを用
いるのが一般的であるが、高域の伸びが十分でなく、指
向特性も劣化してしまう。さらに、構造も複雑となり、
コストアップにつながる。That is, in the case of a hard dome, the dome is made of a material having a high Young's modulus, such as metal or ceramic, and the edge portion is made of a material having a relatively low Young's modulus, such as cloth, urethane, or a plastic film. In the dome portion, the range of piston motion can be widened by the strength obtained from the shape and the material, and low harmonic distortion characteristics can be obtained. However, there is a disadvantage that a peak and a dip occur in the high-frequency characteristic because the edge portion causes reverse resonance. In order to suppress the peak dip, an equalizer is generally used. However, the elongation in a high frequency band is not sufficient, and the directivity is deteriorated. Furthermore, the structure becomes complicated,
This leads to higher costs.
【０００６】また、布やウレタン材料等のヤング率の低
い材料をドーム部とエッジ部に一体型として用いたソフ
トドームタイプはエッジとドームの剛性のバランスが取
れるため、高域のピーク・ディップの発生は少ないが、
強度不足により分割共振が、低い周波数帯域から発生す
るために、帯域全体に歪みがたかくなる欠点を持ってい
る。A soft dome type in which a material having a low Young's modulus, such as cloth or urethane material, is integrally used for the dome portion and the edge portion, can balance the rigidity of the edge and the dome. Although the occurrence is small,
Since the split resonance is generated from a low frequency band due to insufficient strength, there is a drawback that the entire band is distorted.
【０００７】これに対し逆ドーム型のものは、コーン型
のような形状でないため、前室効果がなく、かつ適度な
形状剛性が得られるため、分割共振周波数が高くなりピ
ストン運動帯域が広くなるので、高周波歪が低くなる、
というメリットを有している。On the other hand, the inverted dome type does not have a shape like a cone type, has no anterior chamber effect, and has an appropriate shape rigidity. Therefore, the split resonance frequency is increased and the piston movement band is widened. So the high frequency distortion is lower,
It has the advantage that.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、従来の
一般的な逆ドーム型スピーカは、図８、図９に示したよ
うに、振動板５′の外周端の外側にすぐエッジ７が接着
された構成となっているため、振動板５′とエッジ７′
との放射波が干渉して異常共振を起こし、図３中Ｂで示
すように、高域で大きなピークとディップが発生する、
という課題があった。However, in a conventional general inverted dome type speaker, as shown in FIGS. 8 and 9, the edge 7 is immediately adhered to the outside of the outer peripheral end of the diaphragm 5 '. Because of the configuration, the diaphragm 5 'and the edge 7'
The radiation waves interfere with each other to cause abnormal resonance, and as shown by B in FIG. 3, a large peak and a dip occur in a high frequency band.
There was a problem that.
【０００９】このため、図１０に示すように、ダウンロ
ールエッジ７の上面を遮蔽リング７Ａで覆えばピークは
改善されるものの、図３中Ｃで示すように、高域特性が
だらだら下がってしまい、所望の高域での伸びが得られ
ない、という課題があった。また、遮蔽リング７Ａを用
いる分、組立工数が増加するとともに、コスト高となっ
てしまうなどの課題もあった。For this reason, if the upper surface of the down-roll edge 7 is covered with a shielding ring 7A as shown in FIG. 10, the peak is improved, but as shown by C in FIG. However, there is a problem that elongation in a desired high range cannot be obtained. In addition, the use of the shielding ring 7A also causes problems such as an increase in the number of assembly steps and an increase in cost.
【００１０】この発明は、上記のことに鑑み提案された
もので、その目的とするところは、遮蔽リングを用いず
とも振動板とエッジとの放射波が干渉するのを防止し、
高域での大きなピークの発生を抑え、さらに、高域特性
を伸ばし、指向特性の改善を図ることが可能な逆ドーム
型スピーカを提供することにある。The present invention has been proposed in view of the above, and an object of the present invention is to prevent interference of radiation waves between a diaphragm and an edge without using a shielding ring.
An object of the present invention is to provide an inverted dome type speaker capable of suppressing generation of a large peak in a high frequency range, further extending high frequency characteristics, and improving directional characteristics.
【００１１】[0011]
【課題を解決するための手段】この発明は、振動板が下
方に向ってドーム形状に突出し、かつ外周部がエッジを
介しフレーム側に支持された逆ドーム型スピーカにおい
て、振動板５の外周部を外側へ向って延設し、その延設
部５ｂによってエッジの略半分を覆うことにより、上記
目的を達成している。According to the present invention, there is provided an inverted dome type speaker in which a diaphragm protrudes downward in a dome shape and an outer peripheral portion is supported on a frame side via an edge. Is extended outwardly, and the extension 5b covers substantially half of the edge to achieve the above object.
【００１２】[0012]
【発明の実施の形態】図１および図２は本発明の一実施
例であって、図１は本発明にかかる逆ドーム型スピーカ
の半断面図、図２は本発明の要部拡大説明図を示す。1 and 2 show an embodiment of the present invention. FIG. 1 is a half sectional view of an inverted dome type speaker according to the present invention, and FIG. 2 is an enlarged explanatory view of a main part of the present invention. Is shown.
【００１３】これらの図において１は磁気回路であり、
この磁気回路１は、ほぼ逆Ｔ字状をなすヨーク２と、リ
ング状のマグネット３と、このマグネット３上に設けら
れたリング状のプレート４にて構成され、磁気ギャップ
にはボイスコイル６が振動可能に設けられている。In these figures, 1 is a magnetic circuit,
The magnetic circuit 1 includes a yoke 2 having a substantially inverted T shape, a ring-shaped magnet 3, and a ring-shaped plate 4 provided on the magnet 3, and a voice coil 6 is provided in a magnetic gap. It is provided so as to be able to vibrate.
【００１４】また、５は逆ドーム形状の振動板であり、
この振動板５の背面外周部には、下方に向って突出した
接合部５ａが設けられ、この接合部５ａの内側には円筒
状のボイスコイル６の上部が接着されている。Reference numeral 5 denotes an inverted dome-shaped diaphragm,
A joining portion 5a protruding downward is provided on the outer peripheral portion of the rear surface of the diaphragm 5, and an upper portion of a cylindrical voice coil 6 is adhered inside the joining portion 5a.
【００１５】また、接合部５ａの外側にはダウンロール
エッジ７の内周端において下方に折曲されて形成された
接合部７ａが接着され、かつダウンロールエッジ７の外
周部７ｂはフレーム９側の取付部８に接着されている。
なお、その他１０は、フレーム９、取付部８、磁気回路
１等を一体化するためのネジ、９ａはフレーム９の外側
に形成された取付孔、１１は防塵用のカバーである。A bonding portion 7a bent downward at the inner peripheral end of the down roll edge 7 is bonded to the outside of the bonding portion 5a, and the outer peripheral portion 7b of the down roll edge 7 is connected to the frame 9 side. Is attached to the mounting portion 8.
In addition, reference numeral 10 denotes a screw for integrating the frame 9, the mounting portion 8, the magnetic circuit 1 and the like, 9a denotes a mounting hole formed outside the frame 9, and 11 denotes a dustproof cover.
【００１６】しかして、本発明では、振動板５の接合部
５ａより外側を、振動板５の逆ドーム形状の曲率に沿っ
て上方に向って湾曲した状態でもって延設し、この延設
部５ｂによって、ダウンロールエッジ７の凹状に湾曲し
たロール部７ｃの略半分を覆うように構成し、これによ
り振動板５とダウンロールエッジ７の放射波とが干渉し
て異常共振を起こすのを防止している。According to the present invention, the outer side of the joint 5a of the diaphragm 5 is extended upward along the curvature of the inverted dome shape of the diaphragm 5 so as to extend upward. 5b is configured to cover substantially half of the concavely curved roll portion 7c of the down roll edge 7, thereby preventing the diaphragm 5 from radiating from the down roll edge 7 and causing abnormal resonance. doing.
【００１７】図３中Ａは本発明による音圧−周波数特性
を示す。この周波数特性から明らかなように、図９およ
び図１０に示した従来例の特性Ｂ、Ｃ（図３参照）に比
べ高域がフラットになることがわかる。A in FIG. 3 shows a sound pressure-frequency characteristic according to the present invention. As is apparent from the frequency characteristics, the high frequency band becomes flatter than the characteristics B and C of the conventional example shown in FIGS. 9 and 10 (see FIG. 3).
【００１８】この振動板５の延設量は、ボイスコイル５
の口径が２５ｍｍ、ダウンロールエッジ７のロール部７
ｃの径を３０〜３４ｍｍとすると、略２９〜３１ｍｍの
範囲とすると好ましいことが実験結果から判明した。The amount of extension of the diaphragm 5 depends on the voice coil 5
Diameter of 25 mm, roll part 7 of down roll edge 7
Experimental results have shown that it is preferable to set the diameter of c to be in the range of approximately 29 to 31 mm when the diameter of c is 30 to 34 mm.
【００１９】図４は延設部外径寸法を変化させた場合の
周波数特性を示し、外径寸法により特性を調整すること
ができる。FIG. 4 shows frequency characteristics when the outer diameter of the extension portion is changed, and the characteristics can be adjusted by the outer diameter.
【００２０】図５は本発明の逆ドーム型スピーカの指向
特性、図６および図７はそれぞれハードドーム型、ソフ
トドーム型の指向特性を示す。これらの図から明らかな
ように、本発明の逆ドームスピーカは３０°，６０°の
指向性の劣化の少ないことがわかる。FIG. 5 shows the directional characteristics of the inverted dome type speaker of the present invention, and FIGS. 6 and 7 show the directional characteristics of the hard dome type and the soft dome type, respectively. As is clear from these figures, the inverted dome speaker of the present invention has a small deterioration in directivity at 30 ° and 60 °.
【００２１】なお、上記の例ではダウンロールエッジ７
について説明したが、必ずしもダウンロールでなくとも
良く、アップロールエッジまたはフラット（平面状）エ
ッジに対し、延設部５ｂによってそのエッジのロール部
またはフラット部の略半分を覆うようにしても、略同様
の効果を得ることができる。In the above example, the down roll edge 7
However, it is not always necessary to use a down-roll, and even if an up-roll edge or a flat (planar) edge is covered by the extended portion 5b, substantially half of the roll or flat portion of the edge may be covered. Similar effects can be obtained.
【００２２】[0022]
【発明の効果】以上のように本発明では、逆ドーム型の
振動板５を外側に延出し、エッジの略半分を覆ったた
め、振動板５とエッジとの放射波が干渉するのを延設部
分で防止することができるため、異常共振を防止でき高
域での大きなピーク発生を抑えることができる。As described above, in the present invention, since the inverted dome-shaped diaphragm 5 extends outward and covers almost half of the edge, the interference between the radiation waves of the diaphragm 5 and the edge is extended. Since the partial resonance can be prevented, abnormal resonance can be prevented, and the occurrence of a large peak in a high frequency band can be suppressed.
【００２３】また、図４に延設部外径寸法を変化させた
場合の周波数特性を示す。外径がφ３０．１と大きい場
合は延設部の自己共振周波数とエッジ部の共振周波数が
重なり合うため、２０ＫＨｚのピークが高くなり、外径
がφ２７．５と小さい場合は延設部の共振周波数が２５
ＫＨｚと高くなり、エッジの干渉を防止する効果が充分
でないため、１５ＫＨｚ以上がハイカットになる。本発
明では外径寸法を適宜設定することにより、所望の特性
を得ることができる。FIG. 4 shows frequency characteristics when the outer diameter of the extension portion is changed. When the outer diameter is as large as φ30.1, the self-resonant frequency of the extending portion overlaps with the resonance frequency of the edge portion, so that the peak at 20 KHz increases. When the outer diameter is as small as φ27.5, the resonance frequency of the extending portion is large. Is 25
KHz, which is high, and the effect of preventing edge interference is not sufficient. In the present invention, desired characteristics can be obtained by appropriately setting the outer diameter.
【００２４】また、図５に本発明による逆ドーム型スピ
ーカの指向特性の一例を示す、図６にはハードドーム
型、図７にはソフトドーム型の指向特性を示す。これら
の結果から明らかなように、逆ドーム型スピーカの外径
延設部を最適寸法とすることにより、高域特性が平坦に
伸びて、指向特性を改善することが出来る利点がある。FIG. 5 shows an example of the directivity of the inverted dome type speaker according to the present invention. FIG. 6 shows the directivity of the hard dome type, and FIG. 7 shows the directivity of the soft dome type. As is evident from these results, there is an advantage that by setting the outer diameter extension of the inverted dome type speaker to the optimum size, the high-frequency characteristics are flattened and the directivity characteristics can be improved.
【図１】本発明の一実施例の逆ドーム型スピーカの半断
面図。FIG. 1 is a half sectional view of an inverted dome type speaker according to an embodiment of the present invention.
【図２】本発明の要部断面説明図。FIG. 2 is an explanatory sectional view of a main part of the present invention.
【図３】本発明と従来例とを比較した音圧に対する周波
数特性図。FIG. 3 is a graph showing frequency characteristics with respect to sound pressure in comparison between the present invention and a conventional example.
【図４】延設部外径寸法をφ３０．１，φ２８．５，φ
２７．５とそれぞれ変化させた逆ドーム型スピーカの周
波数特性を示す。[FIG. 4] The outer diameter of the extension part is φ30.1, φ28.5, φ.
27.5 shows the frequency characteristics of the inverted dome type speaker changed respectively.
【図５】本発明の指向特性の一例を示す。FIG. 5 shows an example of the directional characteristics of the present invention.
【図６】ハードドーム型スピーカの指向特性を示す。FIG. 6 shows directional characteristics of a hard dome type speaker.
【図７】ソフトドーム型スピーカの指向特性を示す。FIG. 7 shows directivity characteristics of a soft dome type speaker.
【図８】従来例の半断面図。FIG. 8 is a half sectional view of a conventional example.
【図９】従来例の部分拡大説明図。FIG. 9 is a partially enlarged explanatory view of a conventional example.
【図１０】他の従来例の部分拡大説明図。FIG. 10 is a partially enlarged explanatory view of another conventional example.
１ 磁気回路 ２ ヨーク ３ マグネット ４ プレート ５ 振動板 ５ａ 接合部 ５ｂ 延設部 ６ ボイスコイル ７ ダウンロールエッジ ７ａ 接合部 ７ｂ 外周部 ７ｃ ロール部 ８ 取付部 ９ フレーム ９ａ 取付孔 １０ ネジ １１ カバー DESCRIPTION OF SYMBOLS 1 Magnetic circuit 2 Yoke 3 Magnet 4 Plate 5 Diaphragm 5a Joining part 5b Extension part 6 Voice coil 7 Down roll edge 7a Joining part 7b Outer peripheral part 7c Roll part 8 Mounting part 9 Frame 9a Mounting hole 10 Screw 11 Cover
Claims (2)
し、かつ外周部がエッジを介しフレーム側に支持された
逆ドーム型スピーカにおいて、 振動板（５）の外周部
を外側へ向って延設し、その延設部（５ｂ）によってエ
ッジの略半分を覆ったことを特徴とした逆ドーム型スピ
ーカ。1. An inverted dome type speaker in which a diaphragm protrudes downward in a dome shape and whose outer peripheral portion is supported on the frame side via an edge, wherein the outer peripheral portion of the diaphragm (5) extends outward. An inverted dome-shaped speaker, wherein substantially half of the edge is covered by the extended portion (5b).
ダウンロールエッジ（７）からなり、そのロール部（７
ｃ）の略半分が延設部（５ｂ）にて覆われた逆ドーム型
スピーカ。2. The device according to claim 1, wherein the edge comprises a down-roll edge (7), and the roll portion (7).
An inverted dome type speaker in which almost half of c) is covered with the extension (5b).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26504797A JP3962135B2 (en) | 1997-09-10 | 1997-09-10 | Reverse dome type speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26504797A JP3962135B2 (en) | 1997-09-10 | 1997-09-10 | Reverse dome type speaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1188987A true JPH1188987A (en) | 1999-03-30 |
| JP3962135B2 JP3962135B2 (en) | 2007-08-22 |
Family
ID=17411851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26504797A Expired - Fee Related JP3962135B2 (en) | 1997-09-10 | 1997-09-10 | Reverse dome type speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3962135B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7088842B2 (en) | 2003-02-27 | 2006-08-08 | Pioneer Corporation | Speaker apparatus |
| JP2006229656A (en) * | 2005-02-18 | 2006-08-31 | Star Micronics Co Ltd | Electroacoustic transducer |
| JP2009206808A (en) * | 2008-02-27 | 2009-09-10 | Onkyo Corp | Loudspeaker |
-
1997
- 1997-09-10 JP JP26504797A patent/JP3962135B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7088842B2 (en) | 2003-02-27 | 2006-08-08 | Pioneer Corporation | Speaker apparatus |
| JP2006229656A (en) * | 2005-02-18 | 2006-08-31 | Star Micronics Co Ltd | Electroacoustic transducer |
| JP2009206808A (en) * | 2008-02-27 | 2009-09-10 | Onkyo Corp | Loudspeaker |
| JP4505690B2 (en) * | 2008-02-27 | 2010-07-21 | オンキヨー株式会社 | speaker |
| US7835538B2 (en) | 2008-02-27 | 2010-11-16 | Onkyo Corporation | Loudspeaker |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3962135B2 (en) | 2007-08-22 |
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