JP2006319588A - Diaphragm for electric/acoustic converter - Google Patents

Diaphragm for electric/acoustic converter Download PDF

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Publication number
JP2006319588A
JP2006319588A JP2005139218A JP2005139218A JP2006319588A JP 2006319588 A JP2006319588 A JP 2006319588A JP 2005139218 A JP2005139218 A JP 2005139218A JP 2005139218 A JP2005139218 A JP 2005139218A JP 2006319588 A JP2006319588 A JP 2006319588A
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Japan
Prior art keywords
diaphragm
mica
skin layer
product
present
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JP2005139218A
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Japanese (ja)
Inventor
Hidetoshi Shirakawa
英俊 白川
Kazuhiro Ichikawa
一浩 市川
Yuji Shinagawa
裕司 品川
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Foster Electric Co Ltd
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Foster Electric Co Ltd
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Priority to JP2005139218A priority Critical patent/JP2006319588A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a diaphragm for electric/acoustic converter which improves tone quality of the diaphragm cone made from foaming mica, and can be used as a speaker not only for WF but also for full range. <P>SOLUTION: A skin layer is arranged at least at one surface of a vibration cone substrate made from foaming mica. Consequently, various physical properties are raised and tone quality of middle and high zones is improved. According to the arrangement, the diaphragm can be also used for a speaker for full range. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は音響機器の一種であるスピーカの如き電気音響変換器用振動板、さらに詳しくは発泡マイカ製の電気音響変換器用振動板に関する。   The present invention relates to a diaphragm for an electroacoustic transducer such as a speaker, which is a kind of acoustic equipment, and more particularly to a diaphragm for an electroacoustic transducer made of foamed mica.

振動板に要求される物性としては、例えば高弾性で適度な内部損失を有し、剛性を有し、かつ軽量であることなどが要望される。   The physical properties required for the diaphragm are, for example, high elasticity, moderate internal loss, rigidity, and light weight.

振動板の軽量化を図るために振動板を発泡構造としたものがある。   Some diaphragms have a foamed structure in order to reduce the weight of the diaphragm.

この種の振動板としては、例えば特開昭６０−４１３９７に示されているように、細マイカ鱗片、パルプ繊維、合成繊維等からなる抄造物を加熱するなどして多泡構造としたものがある。
特開昭６０−４１３９７ As this type of diaphragm, as shown in, for example, Japanese Patent Laid-Open No. 60-41397, one having a multi-bubble structure by heating a paper product made of fine mica scales, pulp fibers, synthetic fibers, etc. is there.
JP 60-41397

上記のようないわゆる発泡マイカを基体とする振動板は紙製の振動板と比較すると、比重、曲げ剛性については優れた材料であるが、その構造が多泡構造の中空であるため、ピストンモーション域では良好であるが、分割共振域での音質に問題があった。   The diaphragm based on so-called foamed mica as described above is an excellent material in terms of specific gravity and bending rigidity compared to a paper diaphragm, but its structure is hollow with a multi-bubble structure. Although it was good in the region, there was a problem in the sound quality in the divided resonance region.

この発泡マイカ製の振動板は前述の理由により、主にＷＦ用の振動板に使用されていた。   This diaphragm made of foamed mica has been mainly used as a diaphragm for WF for the reasons described above.

この発明は発泡マイカ製の振動板の音質を改善し、ＷＦ用に限らずフルレンジ用のスピーカ用としても使用可能とした電気音響変換器用振動板を提供することを目的としている。   An object of the present invention is to provide a diaphragm for an electroacoustic transducer that improves the sound quality of a diaphragm made of foamed mica and can be used not only for WF but also for a full range speaker.

請求項１記載の発明によれば、発泡マイカ製の振動板基材の少なくとも一方の表面にスキン層を設けた構成とし、上記目的を達成している。
請求項２記載の発明によれば、請求項１記載の電気音響変換器用振動板において、前記スキン層は金属箔または熱可塑性樹脂からなることを特徴とする。 According to the first aspect of the present invention, a skin layer is provided on at least one surface of a diaphragm base material made of foamed mica to achieve the above object.
According to a second aspect of the present invention, in the electroacoustic transducer diaphragm according to the first aspect, the skin layer is made of a metal foil or a thermoplastic resin.

請求項１、２記載の本発明の振動板によれば、発泡マイカ製の振動板基材の表面にスキン層を設けたため、表面の音波の伝搬が良くなり、中高域の音質を改善でき、また、ヤング率、音速、比曲げ剛性、ｔａｎδ等が向上したため、高域の伸びが良くなり、かつ再生周波数帯域が広くなり、ＷＦ用のみに限らず、フルレンジ用のスピーカにも適用することができる。   According to the diaphragm of the present invention described in claims 1 and 2, since the skin layer is provided on the surface of the foamed mica diaphragm base material, the propagation of sound waves on the surface is improved, and the sound quality in the middle and high ranges can be improved. In addition, since Young's modulus, sound speed, specific bending rigidity, tan δ, and the like have been improved, the high frequency range is improved and the reproduction frequency band is widened, so that it can be applied not only to WF but also to a full range speaker. it can.

以下、図面に沿って本発明の実施例を説明する。   Embodiments of the present invention will be described below with reference to the drawings.

［実施の形態１］
図１は本発明にかかる電機音響変換器用振動板の実施例の概略断面図を示す。 [Embodiment 1]
FIG. 1 is a schematic sectional view of an embodiment of a diaphragm for an electroacoustic transducer according to the present invention.

図中１は発泡マイカ２を含んでなる振動板基材である。   In the figure, reference numeral 1 denotes a diaphragm base material including foamed mica 2.

この振動板基材１は所望の物性を得るために発泡マイカ２以外に必要に応じ樹脂、合成繊維等の適宜の材料が所望量混入され構成される。   In order to obtain desired physical properties, the diaphragm base material 1 is configured by mixing a desired amount of an appropriate material such as a resin and a synthetic fiber as necessary in addition to the foamed mica 2.

３は振動板基材１の少なくとも一方の面に積層されたスキン層である。   Reference numeral 3 denotes a skin layer laminated on at least one surface of the diaphragm base material 1.

このスキン層３としては例えばアルミニウム箔のような金属箔が用いられ、接着剤により振動板基材１の表面に貼り合わせられる。   For example, a metal foil such as an aluminum foil is used as the skin layer 3, and the skin layer 3 is bonded to the surface of the diaphragm base 1 with an adhesive.

図示の実施例では振動板基材１の両面にそれぞれスキン層３が貼り合わされている。   In the illustrated embodiment, the skin layers 3 are bonded to both surfaces of the diaphragm base material 1, respectively.

図２は従来のスキン層のない発泡マイカ製の振動板と本発明品のヤング率の測定結果を示す。Ａが従来品、Ｂが本発明品であり、ヤング率も向上した。   FIG. 2 shows the measurement results of Young's modulus of a diaphragm made of foamed mica having no skin layer and the product of the present invention. A is a conventional product, B is a product of the present invention, and Young's modulus is also improved.

図３は同様に音速の測定結果、図４は比曲げ剛性、図５はｔａｎδの測定結果であり、いずれも従来品Ａに比べ本発明品Ｂの方が、音速、比曲げ剛性、ｔａｎδがともに向上した。   3 shows the measurement result of the sound velocity, FIG. 4 shows the specific bending rigidity, and FIG. 5 shows the measurement result of tan δ. The sound velocity, specific bending rigidity, and tan δ of the product B of the present invention are higher than those of the conventional product A. Both improved.

図６は本発明品Ｂの周波数特性を示す。本発明品では振動板基材１の表面にアルミニウム箔のような金属箔を貼り合わせてスキン層３を形成することで、表面の音波の伝搬を良くすることができ、中高域の音質を改善できた。   FIG. 6 shows the frequency characteristics of the product B of the present invention. In the product of the present invention, the skin layer 3 is formed by laminating a metal foil such as an aluminum foil on the surface of the diaphragm base material 1, thereby improving the propagation of sound waves on the surface and improving the sound quality in the middle and high range. did it.

なお、スキン層３としては金属箔以外に、ポリイミド樹脂フィルムのような熱可塑性樹脂フィルムを用いても良く、この場合もほぼ同様の結果を得ることができる。   In addition to the metal foil, a thermoplastic resin film such as a polyimide resin film may be used as the skin layer 3. In this case, substantially the same result can be obtained.

本発明の実施例にかかる電機音響変換器用振動板の概略断面図を示す。The schematic sectional drawing of the diaphragm for electromechanical transducers concerning the Example of this invention is shown. 従来品と本発明品とのヤング率の測定結果を示す。The measurement result of the Young's modulus of the conventional product and the product of the present invention is shown. 従来品と本発明品との音速の測定結果を示す。The measurement result of the sound speed of the conventional product and the product of the present invention is shown. 従来品と本発明品との比曲げ剛性の測定結果を示す。The measurement result of the specific bending rigidity of a conventional product and the present invention product is shown. 従来品と本発明品とのｔａｎδの測定結果を示す。The measurement result of tan-delta of a conventional product and this invention product is shown. 本発明品の周波数特性を示す。The frequency characteristic of the product of the present invention is shown.

符号の説明Explanation of symbols

１ 振動板基材
２ 発泡マイカ
３ スキン層
Ａ 従来品
Ｂ 本発明品 DESCRIPTION OF SYMBOLS 1 Diaphragm base material 2 Foam mica 3 Skin layer A Conventional product B Invention product

Claims (2)

発泡マイカ製の振動板基材の少なくとも一方の表面にスキン層を設けたことを特徴とする電気音響変換器用振動板。   A diaphragm for an electroacoustic transducer, wherein a skin layer is provided on at least one surface of a diaphragm substrate made of foamed mica. 請求項１記載の電気音響変換器用振動板において、前記スキン層は金属箔または熱可塑性樹脂からなることを特徴とする電気音響変換器用振動板。   The diaphragm for an electroacoustic transducer according to claim 1, wherein the skin layer is made of a metal foil or a thermoplastic resin.
JP2005139218A 2005-05-12 2005-05-12 Diaphragm for electric/acoustic converter Pending JP2006319588A (en)

Priority Applications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016082442A (en) * 2014-10-17 2016-05-16 ヤマハ株式会社 Diaphragm for speaker and method of manufacturing the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5762696A (en) * 1980-10-03 1982-04-15 Sharp Corp Diaphragm for speaker
JPS5762695A (en) * 1980-10-03 1982-04-15 Sharp Corp Diaphragm for speaker
JPS5762697A (en) * 1980-10-03 1982-04-15 Sharp Corp Diaphragm for speaker

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5762696A (en) * 1980-10-03 1982-04-15 Sharp Corp Diaphragm for speaker
JPS5762695A (en) * 1980-10-03 1982-04-15 Sharp Corp Diaphragm for speaker
JPS5762697A (en) * 1980-10-03 1982-04-15 Sharp Corp Diaphragm for speaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016082442A (en) * 2014-10-17 2016-05-16 ヤマハ株式会社 Diaphragm for speaker and method of manufacturing the same

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