JPH07112309B2 - Speaker diaphragm - Google Patents
Speaker diaphragmInfo
- Publication number
- JPH07112309B2 JPH07112309B2 JP26858587A JP26858587A JPH07112309B2 JP H07112309 B2 JPH07112309 B2 JP H07112309B2 JP 26858587 A JP26858587 A JP 26858587A JP 26858587 A JP26858587 A JP 26858587A JP H07112309 B2 JPH07112309 B2 JP H07112309B2
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- speaker
- voice coil
- thin film
- vibration
- 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.)
- Expired - Lifetime
Links
Landscapes
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は音響出力機器等に用いられるスピーカ用振動板
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm for a speaker used in an acoustic output device or the like.
従来の技術 近年、カセットテープレコーダ、マイクロカセットテー
プレコーダ、ハイファイステレオ業界においては音響出
力機器としてのスピーカの音響特性においても、従来よ
りもさらに出力音圧、歪率、出力音圧特性の平坦性に優
れたスピーカが望まれており、音響特性を左右するスピ
ーカ用振動板はますます重要視されている。Conventional technology In recent years, in the cassette tape recorder, micro cassette tape recorder, and hi-fi stereo industry, even in the acoustic characteristics of the speaker as an acoustic output device, the output sound pressure, distortion rate, and output sound pressure characteristics are even more flat than before. An excellent speaker is desired, and a diaphragm for a speaker, which influences acoustic characteristics, is more and more important.
以下、上述の従来のスピーカの例について、その動作を
説明する。スピーカは振動板、ボイスコイルボビン、ボ
イスコイルなどの振動系とマグネット、ポール、プレー
ト、ヨークよりなる磁気回路系よりなる。The operation of the above-mentioned conventional speaker will be described below. The speaker includes a vibration system such as a diaphragm, a voice coil bobbin, and a voice coil, and a magnetic circuit system including a magnet, a pole, a plate, and a yoke.
一様な磁場の中にあるボイスコイルに音声電流が流れる
とボイルコイルに上下方向の電磁力が発生し、電流に応
じて振動する。この振動を正しく振動板の振動に伝え音
波として放射させる（例えば、早坂寿雄：音響工学入
門、日刊工業新聞社）。When a voice current flows through a voice coil in a uniform magnetic field, an up-and-down electromagnetic force is generated in the boil coil and vibrates according to the current. This vibration is correctly transmitted to the vibration of the diaphragm and emitted as a sound wave (for example, Toshio Hayasaka: Introduction to Acoustic Engineering, Nikkan Kogyo Shimbun).
発明が解決しようとする問題点 しかしながら、スピーカの振動板は使用する周波数帯域
にわたってピストン運動することが理想とされるが、振
動中に振動板が変形したり分割振動が生ずると音圧一周
波数特性、歪率、位相特性等が劣化し、高忠実再生の妨
げとなる。また、従来の紙コーン振動板やプラスチック
振動板は振動板材料のもつE/ρ（ただし、E:弾性率、
ρ：密度）が小さいため、高域共振周波数が低く、スピ
ーカが高域まで再生できないという欠点があった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, it is ideal that the diaphragm of the speaker makes a piston motion over the frequency band used, but if the diaphragm is deformed during vibration or divided vibration occurs, the sound pressure-frequency characteristic , Distortion, phase characteristics, etc. are deteriorated, which hinders high-fidelity reproduction. Also, conventional paper cone diaphragms and plastic diaphragms have E / ρ (where E: elastic modulus,
Since ρ: density) is small, there is a drawback that the high frequency resonance frequency is low and the speaker cannot reproduce up to the high frequency range.
本発明は上記問題点に鑑み、振動中に振動板が変形した
り分割振動を生ぜず、高域共振周波数が高いスピーカ用
振動板を提供するものである。In view of the above problems, the present invention provides a speaker diaphragm having a high high resonance frequency, which does not cause the diaphragm to deform or generate divided vibration during vibration.
問題点を解決するための手段 この目的を達成するために本発明のスピーカ用振動板
は、鱗片状マイカとエポキシ樹脂よりなるプリプレグの
片面に超電導薄膜を積層、成形した成形物を振動板とし
て用いたものである。Means for Solving the Problems In order to achieve this object, the speaker diaphragm of the present invention uses a molded product obtained by laminating and molding a superconducting thin film on one surface of a prepreg made of scale-like mica and epoxy resin as a diaphragm. It was what I had.
作用 本発明は、上記した構成により、非常に弾性率が大き
く、これを振動板として用いた場合、振動板の曲げ剛性
が非常に大きく、振動中に振動板が変形したり分割共振
が生じない。また、素材として非常に弾性率の大きい天
然マイカと超電導薄膜とを積層した成形物を用いている
ため、比弾性率E/ρ（但し、E:弾性率、ρ：密度）が大
きく、これを振動板として用いた場合、スピーカの再生
帯域がのび、優れた音圧−周波数特性、歪み率、位相特
性を持つスピーカを得ることができる。Action The present invention has a very large elastic modulus due to the above configuration, and when this is used as a diaphragm, the bending rigidity of the diaphragm is very large, and the diaphragm is not deformed during vibration or split resonance does not occur. . Moreover, since a molded product in which a natural mica having a very large elastic modulus and a superconducting thin film are laminated is used as a material, the specific elastic modulus E / ρ (however, E: elastic modulus, ρ: density) is large, When used as a diaphragm, the reproduction band of the speaker is extended, and a speaker having excellent sound pressure-frequency characteristics, distortion rate, and phase characteristics can be obtained.
また、超電導薄膜は非常に大きな磁気遮蔽能力を持って
いるためこれを振動板として用いた場合、特にスピーカ
前面より放射される磁束を遮断させるため、スピーカの
近辺に設置した音響・映像機器に悪影響を与えることが
なくなる。Also, since the superconducting thin film has a very large magnetic shielding ability, when it is used as a diaphragm, it blocks the magnetic flux radiated from the front of the speaker, which adversely affects audio / visual equipment installed in the vicinity of the speaker. Will not be given.
実施例 以下、本発明の一実施例のスピーカ用振動板について説
明する。Example Hereinafter, a speaker diaphragm according to an example of the present invention will be described.
本発明の一実施例におけるスピーカは、鱗片状マイカと
エポキシ樹脂よりなるプリプレグの片面に超電導薄膜を
積層、成形した成形物を振動板として用いている。この
振動板はボイスコイルボビンに固着され、ボイスコイル
ボビンの先端に設けられたボイスコイルが磁気回路の磁
気ギャップに挿入されている。The speaker in one embodiment of the present invention uses as a diaphragm a molded product obtained by laminating and molding a superconducting thin film on one surface of a prepreg made of scale-like mica and epoxy resin. This diaphragm is fixed to the voice coil bobbin, and the voice coil provided at the tip of the voice coil bobbin is inserted in the magnetic gap of the magnetic circuit.
以上のように構成されたスピーカについて、以下その動
作について説明する。The operation of the speaker configured as above will be described below.
スピーカは振動板、ボイスコイルボビン、ボイスコイル
などの振動系とマグネット、ポール、プレート、ヨーク
よりなる磁気回路系よりなる。一様な磁場の中にあるボ
イスコイルに音声電流が流れるとボイスコイルに上下方
向の電磁力が発生し、電流に応じて振動する。この振動
を正しく振動板の振動を伝え、音波として放出される。The speaker includes a vibration system such as a diaphragm, a voice coil bobbin, and a voice coil, and a magnetic circuit system including a magnet, a pole, a plate, and a yoke. When a voice current flows through a voice coil in a uniform magnetic field, a vertical electromagnetic force is generated in the voice coil and vibrates in response to the current. This vibration is correctly transmitted as the vibration of the diaphragm and is emitted as a sound wave.
次に振動板の製造方法について述べると、天然マイカ
（フロゴパイトマイカ 150メッシュパス）70部、エポ
キシ樹脂30部よりなるプリプレグとセラミック系超電導
薄膜20μｍの積層物を温度100℃、圧力20kg/cm2、時間3
0minの条件で硬化、成形しφ30mmの平板状振動板として
いる。Next, the manufacturing method of the diaphragm will be described. A prepreg consisting of 70 parts of natural mica (phlogopite mica 150 mesh pass) and 30 parts of epoxy resin, and a ceramic superconducting thin film 20 μm laminated at 100 ° C. and 20 kg / cm 2 of pressure. 2 , time 3
Hardened and molded under the condition of 0 min to make a flat diaphragm with a diameter of 30 mm.
以上のように本実施例によれば、鱗状片マイカとエポキ
シ樹脂よりなるプリプレグの片面に超電導薄膜を積層、
成形した成形物を振動板として用いたスピーカは振動板
の変形、分割共振が生ぜず良好な音響特性が得られ、同
じ形状のアルミニウム製平板状振動板と比較して歪み率
を20dB低下させることができる。また、高域共振周波数
は21kHzより40kHzに上昇させることができた。また、出
力音圧のピークディップも±3dBとアルミニウムの振動
板と比較して、約±3dB低下させることができる。As described above, according to the present embodiment, the superconducting thin film is laminated on one surface of the prepreg made of the scale-like mica and the epoxy resin,
A speaker using a molded product as a diaphragm can obtain good acoustic characteristics without the diaphragm deforming or splitting resonance, and the distortion rate should be reduced by 20 dB compared with a flat aluminum diaphragm of the same shape. You can Moreover, the high frequency resonance frequency could be raised from 21kHz to 40kHz. Moreover, the peak dip of the output sound pressure can be reduced by ± 3 dB, which is about ± 3 dB lower than that of the aluminum diaphragm.
また、磁気漏洩の測定においても、スピーカの前面10cm
の距離において漏洩磁束が0.3ガウスとなり、従来のア
ルミニウム製振動板が約1.2ガウスであるのに対し大幅
な減少となった。Also, when measuring magnetic leakage, 10 cm in front of the speaker
The leakage magnetic flux was 0.3 Gauss at the distance of, which was a large reduction compared to about 1.2 Gauss for the conventional aluminum diaphragm.
発明の効果 以上のように本発明は、鱗片状マイカとエポキシ樹脂よ
りなるプリプレグの片面に超電導薄膜を積層、成形した
成形物を振動板として用いたもので、歪率が小さく、高
域共振周波数が高く、また音響出力が大きなスピーカを
得ることができ、良好な音響特性を有する優れたスピー
カを実現でき、さらに超電導薄膜により磁気漏洩が大幅
に減少できる。Effects of the Invention As described above, the present invention uses a molded product formed by laminating and molding a superconducting thin film on one surface of a prepreg made of scale-like mica and epoxy resin, and having a low distortion rate and a high resonance frequency. It is possible to obtain a loudspeaker having a high acoustic output and a large acoustic output, and it is possible to realize an excellent loudspeaker having good acoustic characteristics. Further, magnetic leakage can be greatly reduced by the superconducting thin film.
Claims (1)
プレグの片面に超電導薄膜を積層、成形した成形物を用
いた事を特徴とするスピーカ用振動板。1. A diaphragm for a speaker, comprising a molded product obtained by laminating and molding a superconducting thin film on one surface of a prepreg made of scale-like mica and epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26858587A JPH07112309B2 (en) | 1987-10-23 | 1987-10-23 | Speaker diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26858587A JPH07112309B2 (en) | 1987-10-23 | 1987-10-23 | Speaker diaphragm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01109998A JPH01109998A (en) | 1989-04-26 |
| JPH07112309B2 true JPH07112309B2 (en) | 1995-11-29 |
Family
ID=17460572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26858587A Expired - Lifetime JPH07112309B2 (en) | 1987-10-23 | 1987-10-23 | Speaker diaphragm |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07112309B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE68920956T2 (en) * | 1988-11-15 | 1995-09-21 | Kenwood Corp | Loudspeaker damping arrangement. |
-
1987
- 1987-10-23 JP JP26858587A patent/JPH07112309B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01109998A (en) | 1989-04-26 |
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