JP4749402B2 - Diaphragm for electroacoustic transducer - Google Patents
Diaphragm for electroacoustic transducer Download PDFInfo
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- JP4749402B2 JP4749402B2 JP2007252908A JP2007252908A JP4749402B2 JP 4749402 B2 JP4749402 B2 JP 4749402B2 JP 2007252908 A JP2007252908 A JP 2007252908A JP 2007252908 A JP2007252908 A JP 2007252908A JP 4749402 B2 JP4749402 B2 JP 4749402B2
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- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000011888 foil Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Description
この発明は、電気音響変換器用振動板、詳しくは異形断面のほぼドーム状の振動板に関する。 The present invention relates to a diaphragm for an electroacoustic transducer, and more particularly to a substantially dome-shaped diaphragm having an irregular cross section.
振動板としては低音再生用、中音再生用等に応じコーン形、平板形等種々のものが存在するが、高域再生用として振動板形状がドーム状に形成されたものがある。 There are various types of diaphragms such as a cone shape and a flat plate shape for low sound reproduction and medium sound reproduction, and there are diaphragms formed in a dome shape for high frequency reproduction.
ドーム状振動板は、その平面形状は円形をなし、かつ側面形状は半円形をなし、全体として半球状に形成されている。そして、この振動板に、周知のように、磁気回路におかれた駆動用のボイスコイルが結合され、ボイスコイルの振動が振動板に伝達され前面に音を放射するようになっている。
しかしながら、このようなドーム状の振動板は、振動板の頂点と、ボイスコイルが結合されている外周部との長さが円周上のどの位置においても等しくなっているため、ボイスコイルを介し伝達される振動は振動板の頂点に同位相で集中することとなるため、共振が生じ易く、良好な音質を得難い、という課題がある。 However, in such a dome-shaped diaphragm, the length of the apex of the diaphragm and the outer peripheral portion to which the voice coil is coupled are equal at any position on the circumference. Since the transmitted vibrations are concentrated in the same phase on the top of the diaphragm, there is a problem that resonance easily occurs and it is difficult to obtain good sound quality.
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、音質を良好としたほぼドーム状の電気音響変換器用振動板を提供するところにある。 The present invention has been proposed in view of the above, and an object of the present invention is to provide a substantially dome-shaped electroacoustic transducer diaphragm having good sound quality.
請求項1の発明によれば、外周形状が円形に形成され、全体形状がほぼドーム状に形成された電気音響変換器用振動板において、ドーム頂点部0を通って外周に伸びる稜線2をほぼS字状の稜線2とし、この稜線2を境に左右非対称の曲面形状とした、ことを特徴とする。
According to the first aspect of the present invention, in the electroacoustic transducer diaphragm in which the outer peripheral shape is formed in a circular shape and the overall shape is formed in a substantially dome shape, the
本発明では、ドーム頂点部を通る稜線をほぼS字状とし、左右非対称な曲面を形成し、共振を分散させることができるため、高域の大きなピークが低減し、周波数特性を改善することができ、音質が良好となる効果がある。 In the present invention, the ridge line passing through the top of the dome is substantially S-shaped, and a left-right asymmetric curved surface can be formed and resonance can be dispersed, so that a large high-frequency peak can be reduced and frequency characteristics can be improved. Can be obtained, and the sound quality is improved.
以下、図面に沿って本発明の一実施例を説明する。 An embodiment of the present invention will be described below with reference to the drawings.
図1は本発明に係るほぼドーム状の振動板の斜視図、図2は平面図、図3(a)は図2中A−A線断面図、図3(b)は図2中B−B線断面図、図3(c)は図2中C−C線断面図を示す。 1 is a perspective view of a substantially dome-shaped diaphragm according to the present invention, FIG. 2 is a plan view, FIG. 3A is a cross-sectional view taken along line AA in FIG. 2, and FIG. B line sectional drawing and FIG.3 (c) show CC line sectional drawing in FIG.
本発明の電気音響変換器用振動板1は、図1に示すように、外周形状は円形をなし、全体形状が円形ドーム状に形成され、ドーム頂点部を通って外周に伸びる稜線をほぼS字状形状の稜線2とし、図示の状態においてこの稜線2を境とした左右の振動板形状を左右非対称の曲面とした形状としている。
As shown in FIG. 1, the
稜線2に対しドーム頂点部0を通り、かつほぼ直交する径方向の伸びる稜線4は、図2中B−B線に示す図3(b)の断面に示すように、中央部にドーム頂点部0が位置し、左右の第1、第2の稜線4a、4bの長さ、曲率半径は等しく形成されている。
The
図2において、ドーム中心0より右側のA−A線断面では、図3(a)に示すように、稜線3は、左右の第3、第4の稜線3a、3bからなり、その曲率半径は、長さの長い第1の稜線3aの曲率半径が小さく、長さの短い第2の稜線3bは大きな曲率半径で形成されている。
2, in the cross section along the line AA on the right side of the dome center 0, as shown in FIG. 3A, the
また、図2において、ドーム頂点部0より左側のC−C線断面では、図3(c)に示すように、稜線5は、左右の第5、第6の稜線5a、5bからなり、その曲率半径は、長さの短い第5の稜線5aの曲率半径が大きく、長さの長い第6の稜線5bの曲率半径は小さく形成されている。
Further, in FIG. 2, in the CC cross section on the left side of the dome apex portion 0, as shown in FIG. 3 (c), the ridge line 5 is composed of left and right fifth and
したがって、ボイスコイルを介し伝達される振動は振動板頂点部に同位相で集中することはなく、共振が生じ難い。 Therefore, the vibration transmitted through the voice coil does not concentrate in the same phase on the top of the diaphragm, and resonance hardly occurs.
この形状の電気音響変換器用振動板1は、好ましくはその素材としてアルミニウム箔やマグネシウム箔を成形加工して製造され、かつ磁気回路の磁気ギャップ内に他端が振動可能に配置されたボイスコイル(図示せず)の一端が結合される。
また、外周部はエッジを介しフレーム(いずれも図示せず)に固定されるなどしてスピーカに組み込まれる。
The
Further, the outer peripheral portion is incorporated into the speaker by being fixed to a frame (none of which is shown) via an edge.
単なるドーム状の振動板では、有限要素法での自由振動モードのシミュレーションで振動モードを実測すると、形状がドーム形状のため、頂点の外周にほぼリング状の軸対称モードが生じる。しかしながら、本発明に係る振動板は異形断面形状のため、頂点から放射状に広がる軸対象モードが見られず、共振箇所が分散される。 In a simple dome-shaped diaphragm, when the vibration mode is actually measured by simulation of the free vibration mode by the finite element method, the shape is a dome shape, so that a substantially ring-shaped axisymmetric mode is generated on the outer periphery of the apex. However, since the diaphragm according to the present invention has an irregular cross-sectional shape, the axial target mode that spreads radially from the apex is not seen, and the resonance points are dispersed.
図4は本発明に係る振動板を備えたスピーカの周波数特性を示す。横軸は周波数、縦軸は音圧である。図5は単なるドーム形状の振動板を備えた従来のスピーカの周波数特性を示す。 FIG. 4 shows the frequency characteristics of a speaker provided with a diaphragm according to the present invention. The horizontal axis is frequency and the vertical axis is sound pressure. FIG. 5 shows the frequency characteristics of a conventional speaker having a simple dome-shaped diaphragm.
従来品では、高域側で大きなピークが見られるが、本発明品では、高域における大きなピークが減少し、従来品に比べピークディップが減少し、フラットな特性となり、音質が向上する。 In the conventional product, a large peak is observed on the high frequency side. However, in the product of the present invention, the large peak in the high frequency is reduced, the peak dip is reduced compared to the conventional product, the characteristics are flat, and the sound quality is improved.
なお、本発明は、振動板が背面側、すなわち磁気回路側に向って逆ドーム形状の彎曲形成されたものについても適用し得ることは勿論である。 Of course, the present invention can also be applied to a diaphragm in which an inverted dome is bent toward the back side, that is, the magnetic circuit side.
0 ドーム頂点部
1 振動板
2、3、4、5 稜線
3a 第1の稜線
3b 第2の稜線
4a 第1の稜線
4b 第2の稜線
5a 第1の稜線
5b 第2の稜線
0
Claims (1)
ドーム頂点部0を通って外周に伸びる稜線(2)をほぼS字状の稜線(2)とし、この稜線(2)を境に左右非対称の曲面形状とした、
ことを特徴とする電気音響変換器用振動板。 In the electroacoustic transducer diaphragm in which the outer peripheral shape is formed in a circular shape and the overall shape is formed in a substantially dome shape,
A ridge (2) substantially S-shaped edge lines (2) extending to the outer periphery through the dome apex 0 and asymmetrical curved shape bordering the ridge (2),
A diaphragm for an electroacoustic transducer.
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JP2007252908A JP4749402B2 (en) | 2007-09-28 | 2007-09-28 | Diaphragm for electroacoustic transducer |
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JP2007252908A JP4749402B2 (en) | 2007-09-28 | 2007-09-28 | Diaphragm for electroacoustic transducer |
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JP2009088727A JP2009088727A (en) | 2009-04-23 |
JP4749402B2 true JP4749402B2 (en) | 2011-08-17 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111567062A (en) * | 2017-11-10 | 2020-08-21 | 阿米那科技有限公司 | Flat panel speaker |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5039925A (en) * | 1973-08-15 | 1975-04-12 | ||
JPS5571394A (en) * | 1978-11-25 | 1980-05-29 | Matsushita Electric Ind Co Ltd | Speaker |
JPS60145791U (en) * | 1984-03-09 | 1985-09-27 | オンキヨー株式会社 | dome type speaker |
JPH01503189A (en) * | 1986-07-04 | 1989-10-26 | アー エヌ テー ナツハリヒテンテヒニーク ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | A diaphragm system for an acoustic transducer with a plate having rotationally symmetrical bending stiffness as an element for radiating or absorbing sound, and a method for using the diaphragm system |
JPH0338997A (en) * | 1989-07-05 | 1991-02-20 | Matsushita Electric Ind Co Ltd | Loudspeaker |
JP2003339094A (en) * | 2002-05-21 | 2003-11-28 | Foster Electric Co Ltd | Diaphragm for electroacoustic transducer |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6429990A (en) * | 1987-07-24 | 1989-01-31 | Sanyo Electric Co | Coin inspection for coin selector |
JP2007081901A (en) * | 2005-09-15 | 2007-03-29 | Foster Electric Co Ltd | Diaphragm for speaker, and speaker |
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2007
- 2007-09-28 JP JP2007252908A patent/JP4749402B2/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5039925A (en) * | 1973-08-15 | 1975-04-12 | ||
JPS5571394A (en) * | 1978-11-25 | 1980-05-29 | Matsushita Electric Ind Co Ltd | Speaker |
JPS60145791U (en) * | 1984-03-09 | 1985-09-27 | オンキヨー株式会社 | dome type speaker |
JPH01503189A (en) * | 1986-07-04 | 1989-10-26 | アー エヌ テー ナツハリヒテンテヒニーク ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | A diaphragm system for an acoustic transducer with a plate having rotationally symmetrical bending stiffness as an element for radiating or absorbing sound, and a method for using the diaphragm system |
JPH0338997A (en) * | 1989-07-05 | 1991-02-20 | Matsushita Electric Ind Co Ltd | Loudspeaker |
JP2003339094A (en) * | 2002-05-21 | 2003-11-28 | Foster Electric Co Ltd | Diaphragm for electroacoustic transducer |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111567062A (en) * | 2017-11-10 | 2020-08-21 | 阿米那科技有限公司 | Flat panel speaker |
US11388518B2 (en) | 2017-11-10 | 2022-07-12 | Amina Technologies Limited | Flat panel loudspeaker |
CN111567062B (en) * | 2017-11-10 | 2022-12-13 | 阿米那科技有限公司 | Flat panel speaker |
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