JP2008153923A - Diaphragm for speaker, speaker using the same, and electronic equipment and device using the speaker - Google Patents
Diaphragm for speaker, speaker using the same, and electronic equipment and device using the speaker Download PDFInfo
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- 239000000835 fiber Substances 0.000 claims abstract description 48
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 43
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 43
- 241001330002 Bambuseae Species 0.000 claims abstract description 43
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 43
- 239000011425 bamboo Substances 0.000 claims abstract description 43
- 229920005610 lignin Polymers 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 5
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 3
- 239000004626 polylactic acid Substances 0.000 claims description 3
- 239000012670 alkaline solution Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 12
- 238000010411 cooking Methods 0.000 abstract description 4
- 238000003754 machining Methods 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 244000273618 Sphenoclea zeylanica Species 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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Abstract
Description
本発明は各種音響機器や映像機器に使用されるスピーカ用振動板やこれを用いたスピーカおよびステレオセットやテレビセット等の電子機器および自動車等の装置に関するものである。 The present invention relates to speaker diaphragms used in various audio equipment and video equipment, speakers using the same, electronic equipment such as stereo sets and television sets, and devices such as automobiles.
最近の音響機器や映像機器等の電子機器に関しては、デジタル技術の著しい進歩により、従来と比較して飛躍的に性能向上が図られてきた。 With respect to recent electronic equipment such as audio equipment and video equipment, the performance has been dramatically improved as compared with the prior art due to remarkable progress in digital technology.
この電子機器の性能向上により、これらの電子機器に使用されるスピーカも性能向上が市場より強く要請されている。 Due to the performance improvement of these electronic devices, there is a strong demand from the market to improve the performance of speakers used in these electronic devices.
その性能向上が市場より強く要請されているスピーカについては、スピーカ構成部品の中で、その音質を決定する大きなウエイトを占める振動板の高性能化への対応が必要不可欠である。 For loudspeakers whose performance is strongly demanded by the market, it is indispensable to cope with higher performance of the diaphragm, which occupies a great weight among the loudspeaker components.
振動板の高性能化の中でも高音質化に対する要望が大きい。従って高音質を実現できるスピーカ用振動板の開発が不可欠である。 There is a great demand for higher sound quality among diaphragms with higher performance. Therefore, it is essential to develop a speaker diaphragm that can achieve high sound quality.
従来から、これらスピーカ用振動板の開発に関しては、その材料面や製造工程における開発により、さまざまな振動板材料や製造方法が開発され、実用化されてきた。 Conventionally, regarding the development of these diaphragms for speakers, various diaphragm materials and manufacturing methods have been developed and put into practical use due to the development of the material and manufacturing processes.
また最近では、その剛性により高音質化を実現でき、さらに地球環境に優しく、かつ安定供給が望める材料として竹繊維を使用した振動板の開発も進んできている。 Recently, the development of a diaphragm using bamboo fiber as a material that can achieve high sound quality due to its rigidity, is friendly to the global environment, and can be stably supplied.
尚、この出願の発明に関する先行技術文献情報としては、例えば、特許文献１が知られている。
従来のスピーカ用振動板の材料は、蒸解された未さらしパルプ、あるいはさらしパルプを用いてきた。 Conventional speaker diaphragm materials have been cooked unbleached pulp or bleached pulp.
これらの蒸解された材料を使用している以上、単にビータ等によって叩解した繊維から抄紙振動板を製造しても強度が弱く、また弾性率も小さく、スピーカ用振動板として、強度面でも音質面でも十分な性能を確保しにくいという課題を有するものであった。 Since these cooked materials are used, the strength of the papermaking diaphragm is low even when it is manufactured from fibers beaten with a beater or the like, and the elastic modulus is low. However, it has a problem that it is difficult to ensure sufficient performance.
以上の内容は、剛性の高い竹繊維を使用した振動板の開発においても同様であった。 The above contents were the same in the development of a diaphragm using bamboo fibers having high rigidity.
この原因としては、蒸解工程を経ることで竹繊維中のリグニン量が大幅に減少し、通常の木材パルプに比べて、強度や弾性率に大きな差異がなくなるためである。 This is because the amount of lignin in the bamboo fiber is greatly reduced by passing through the cooking process, and there is no significant difference in strength and elastic modulus compared to ordinary wood pulp.
本発明は前記課題を解決し、振動板の強度や弾性率を確保することで材料剛性を向上させ、スピーカとして高音質化を図り、高信頼性化をも可能とするスピーカ用振動板を提供することを目的とするものである。 The present invention provides a loudspeaker diaphragm that solves the above-mentioned problems, improves the material rigidity by ensuring the strength and elastic modulus of the diaphragm, achieves high sound quality as a loudspeaker, and can also achieve high reliability. It is intended to do.
上記目的を達成するために本発明は、振動板の剛性向上によるスピーカの音質向上を、地球環境に優しい材料で実現するため、竹繊維を用いて振動板の材料を開発したものである。 In order to achieve the above object, the present invention has developed a diaphragm material using bamboo fiber in order to realize the sound quality improvement of the speaker by improving the rigidity of the diaphragm with a material friendly to the global environment.
そして、蒸解処理することで竹繊維中のリグニン量が大幅に減少してリグニン量が３ｗｔ％〜６ｗｔ％程度になり通常の木材パルプに比べて、強度や弾性率に大きな差異がなくなることから、この蒸解処理されていない竹繊維を５ｗｔ％以上含有してスピーカ用振動板を構成したものである。 And, the amount of lignin in bamboo fiber is greatly reduced by cooking, and the amount of lignin is about 3 wt% to 6 wt%, so there is no significant difference in strength and elastic modulus compared to ordinary wood pulp, A speaker diaphragm is formed by containing 5 wt% or more of bamboo fiber that has not been cooked.
この構成とすることにより、剛性を有する竹から得られた竹繊維の強度や弾性率を確保することで材料剛性を向上させ、振動板に十分な強度や弾性率を与えることができるためスピーカとして高音質化を図り、高信頼性化を図ることができる。 By adopting this configuration, it is possible to improve the material rigidity by securing the strength and elastic modulus of bamboo fiber obtained from the bamboo having rigidity, and as the speaker can give sufficient strength and elastic modulus to the diaphragm. It is possible to achieve high sound quality and high reliability.
以上のように本発明のスピーカ用振動板は、蒸解処理されていない竹繊維を５ｗｔ％以上含有してスピーカ用振動板を構成することにより、剛性を有する竹から得られた竹繊維の強度や弾性率を確保することで材料剛性を向上させ、振動板に十分な強度や弾性率を与えることができるため、スピーカとしての高音質化、高信頼性化を図ることができる。 As described above, the speaker diaphragm of the present invention comprises 5% by weight or more of bamboo fiber that has not been digested to constitute the speaker diaphragm, whereby the strength of bamboo fiber obtained from bamboo having rigidity can be increased. By securing the elastic modulus, the material rigidity can be improved and sufficient strength and elastic modulus can be given to the diaphragm, so that high sound quality and high reliability as a speaker can be achieved.
さらに、安価で地球環境に優しいスピーカ用振動板を提供することができ、その工業的価値は非常に大なるものである。 Furthermore, it is possible to provide a speaker diaphragm that is inexpensive and friendly to the global environment, and its industrial value is very large.
本発明の実施の形態について、以下図面を用いて説明する。 Embodiments of the present invention will be described below with reference to the drawings.
（実施の形態１）
以下、実施の形態１を用いて、本発明の特に請求項１から請求項５に記載の発明について説明する。
(Embodiment 1)
Hereinafter, the first to fifth aspects of the present invention will be described with reference to the first embodiment.
本発明は、蒸解処理をしない天然繊維を物理的に叩解することに着眼し、鋭意検討した結果、竹繊維は天然繊維の中で、物理的加工が非常に容易な繊維であることが判明した。 The present invention focuses on physically beating natural fibers that are not cooked, and as a result of intensive studies, it has been found that bamboo fibers are fibers that are very easy to physically process among the natural fibers. .
木材が年輪を増しながら成長するのに対して、竹は維管束と呼ばれる中空の茎を形成しながら成長することから、よりミクロ単位でも繊維の並ぶ方向が規則的であり、パルプ状に微細加工しやすくなるため、加工性が著しく向上できると考えられる。 While wood grows with increasing annual rings, bamboo grows while forming hollow stems called vascular bundles, so the direction of fiber alignment is regular even in micro units, and fine processing into pulp Therefore, it is considered that the workability can be remarkably improved.
すなわち、本発明の振動板は竹繊維を主成分とするものであるが、少なくとも５ｗｔ％以上の竹繊維は、蒸解工程を経ていない竹繊維を使用することで振動板の剛性を向上させることができる。 That is, the diaphragm of the present invention is mainly composed of bamboo fibers, but at least 5 wt% or more of bamboo fibers can improve the rigidity of the diaphragm by using bamboo fibers that have not undergone the cooking process. it can.
ここで、５ｗｔ％以下では効果が小さく、音質や特性に効果が顕著に現れない。 Here, if it is 5 wt% or less, the effect is small, and the effect does not appear remarkably in sound quality and characteristics.
また、５ｗｔ％以上使用する竹繊維のリグニン量は、８ｗｔ％以上で、かつ２０ｗｔ％以下が好ましい。 Further, the amount of lignin of bamboo fiber used at 5 wt% or more is preferably 8 wt% or more and 20 wt% or less.
ここで、８ｗｔ％未満では剛性向上が小さく、音質や特性に効果が顕著に現れない。 Here, if it is less than 8 wt%, the rigidity improvement is small, and the effect does not appear remarkably in sound quality and characteristics.
また、多すぎるとセルロース成分の構成比が下がることになり、音質や特性上好ましくない。 On the other hand, when the amount is too large, the composition ratio of the cellulose component is lowered, which is not preferable in terms of sound quality and characteristics.
そして、２０ｗｔ％を超えると、セルロースの水素結合による剛性向上が小さくなり、条件によっては効果が出ないことが多い。 And if it exceeds 20 wt%, the rigidity improvement by the hydrogen bond of a cellulose will become small, and an effect will not come out depending on conditions in many cases.
尚、リグニン量の測定は硫酸法で測定した値で規定する。 The amount of lignin is defined by the value measured by the sulfuric acid method.
そして、５ｗｔ％使用する竹繊維は、５０℃以下の温度条件下で０．５ｗｔ％〜２０ｗｔ％のアルカリ溶液（代表的には水酸化ナトリウム溶液）で処理することが好ましい。 The bamboo fiber used at 5 wt% is preferably treated with a 0.5 wt% to 20 wt% alkaline solution (typically a sodium hydroxide solution) under a temperature condition of 50 ° C. or less.
ここで、温度が５０℃を超えたり、濃度が２０ｗｔ％を超えると、リグニンが流出し、リグニン量が８ｗｔ％を保てないケースが多い。 Here, when the temperature exceeds 50 ° C. or the concentration exceeds 20 wt%, lignin flows out and the amount of lignin cannot be maintained at 8 wt% in many cases.
また、０．５ｗｔ％より小さい濃度で処理する場合は、リグニン量が２０ｗｔ％を超えるケースが多い。 In addition, when processing at a concentration lower than 0.5 wt%, the amount of lignin often exceeds 20 wt%.
尚、このアルカリ処理は、リグニン量の調整のみならず、物理的加工を容易にする前処理の効果や、後の抄紙時にセルロースの水素結合を著しく阻害する不純物の削減にも効果が大きい。 This alkali treatment is not only effective in adjusting the amount of lignin but also in the effect of pretreatment for facilitating physical processing and the reduction of impurities that significantly impede hydrogen bonding of cellulose during subsequent paper making.
本発明の竹繊維抄紙振動板は、環境に優しい竹繊維を用いたものであるため音質調整剤としては、ポリ乳酸や生ゴムを用いることが環境面でさらに好ましい。 Since the bamboo fiber papermaking diaphragm of the present invention uses environmentally friendly bamboo fibers, it is more preferable in terms of environment to use polylactic acid or raw rubber as a sound quality adjusting agent.
ここで、ポリ乳酸は環境面だけでなく、音質制御面でも振動板の剛性向上に適しており音質向上に効果的である。 Here, polylactic acid is suitable not only for environmental aspects but also for sound quality control, in order to improve the rigidity of the diaphragm, and is effective in improving sound quality.
また、生ゴムは同様に、振動板の内部損失向上に適しており音質向上に効果的である。 Similarly, raw rubber is suitable for improving the internal loss of the diaphragm and is effective for improving sound quality.
以下、本発明の最良の実施の形態の説明と、一部の実施例を示す。 Hereinafter, description of the best mode of the present invention and some examples will be given.
図１は、本発明の一実施の形態におけるスピーカ用振動板の断面図を示したものである。 FIG. 1 shows a cross-sectional view of a speaker diaphragm according to an embodiment of the present invention.
図１に示すように、本発明の振動板は、竹繊維を５ｗｔ％以上、好ましくは８０ｗｔ％以上含んだ振動板であり、その竹繊維中の５ｗｔ％以上、好ましくは１０ｗｔ％が、蒸解処理されていない竹繊維であり、リグニン量が８ｗｔ％〜２０ｗｔ％の竹繊維で構成されたものである。 As shown in FIG. 1, the diaphragm of the present invention is a diaphragm containing 5 wt% or more, preferably 80 wt% or more of bamboo fiber, and 5 wt% or more, preferably 10 wt% of the bamboo fiber is digested. It is a bamboo fiber that is not made and is composed of bamboo fiber having a lignin amount of 8 wt% to 20 wt%.
（比較例１）
平均繊維長Ｌ（ｌ）が１．７ｍｍの蒸解竹繊維で１６ｃｍ径の振動板を作製した。
(Comparative Example 1)
A diaphragm having a diameter of 16 cm was prepared from cooked bamboo fiber having an average fiber length L (l) of 1.7 mm.
このときの音速は１８００ｍ／ｓであった。 The sound speed at this time was 1800 m / s.
（実施例１）
４５℃の温度で、１８ｗｔ％ＮａＯＨ水溶液で６時間処理した竹繊維を製造した。
(Example 1)
Bamboo fibers treated with an 18 wt% NaOH aqueous solution at a temperature of 45 ° C. for 6 hours were produced.
その後、ミキサー処理して平均繊維長は１．６ｍｍ、リグニン量は１０ｗｔ％であった。 Then, the average fiber length was 1.6 mm and the amount of lignin was 10 wt% by mixer treatment.
比較例１の繊維９５ｗｔ％と、この竹繊維を５ｗｔ％混合して１６ｃｍ径のスピーカを作製した。 A speaker having a diameter of 16 cm was prepared by mixing 95 wt% of the fiber of Comparative Example 1 and 5 wt% of this bamboo fiber.
このときの音速は２２００ｍ／ｓであった。 The sound speed at this time was 2200 m / s.
（比較例２）
実施例１で混合比率を９７／３で実施した音速は２０００ｍ／ｓであった。
(Comparative Example 2)
The speed of sound performed in Example 1 with a mixing ratio of 97/3 was 2000 m / s.
（実施例２）
実施例１と２３℃の温度で０．５ｗｔ％ＮａＯＨ水溶液で３時間処理した以外は同様とした。
(Example 2)
Example 1 was the same as in Example 1 except that it was treated with a 0.5 wt% NaOH aqueous solution at a temperature of 23 ° C. for 3 hours.
結果、平均繊維長１．６ｍｍ、リグニン量１９ｗｔ％の竹繊維を得た。 As a result, bamboo fibers having an average fiber length of 1.6 mm and a lignin amount of 19 wt% were obtained.
比較例１の繊維と９５／５で混合して振動板を得た。 A diaphragm was obtained by mixing with the fiber of Comparative Example 1 at 95/5.
このときの音速は２４１０ｍ／ｓであった。 The sound speed at this time was 2410 m / s.
（実施例３）
実施例１と２３℃の温度で０．５ｗｔ％ＮａＯＨ水溶液で１時間処理した以外は同様とした。
(Example 3)
Example 1 was the same as Example 1 except that the treatment was performed at a temperature of 23 ° C. with a 0.5 wt% NaOH aqueous solution for 1 hour.
平均繊維長は１．６ｍｍ、リグニン量は２３ｗｔ％であった。 The average fiber length was 1.6 mm, and the amount of lignin was 23 wt%.
実施例１と同様の混合比で振動板を作製した。 A diaphragm was produced at the same mixing ratio as in Example 1.
このときの音速は２３５０ｍ／ｓであった。 The speed of sound at this time was 2350 m / s.
実施例２と実施例３に記載の振動板を、青色に着色を試みた。 The diaphragms described in Example 2 and Example 3 were tried to be colored blue.
その結果、実施例２は均一の青色に着色したが、実施例３は斑模様になった。 As a result, Example 2 was colored uniformly blue, but Example 3 was spotted.
以上の結果より、蒸解処理されていない竹繊維のリグニン量が、８ｗｔ％〜２０ｗｔ％の範囲が最適であることがわかる。 From the above results, it can be seen that the lignin content of the bamboo fiber that has not been digested is optimally in the range of 8 wt% to 20 wt%.
また、リグニン量は２０ｗｔ％を超えた場合は、２０ｗｔ％程度の効果しか得られない。 Further, when the amount of lignin exceeds 20 wt%, only an effect of about 20 wt% can be obtained.
そして、２０ｗｔ％を超えると染料による着色がしにくくなる。 And when it exceeds 20 wt%, it will become difficult to color with a dye.
（実施の形態２）
以下、実施の形態２を用いて、本発明の特に請求項６に記載の発明について説明する。
(Embodiment 2)
The second aspect of the present invention will be described below with reference to the second embodiment.
図２は、本発明の一実施形態のスピーカの断面図を示したものである。 FIG. 2 is a cross-sectional view of a speaker according to an embodiment of the present invention.
図２に示すように、着磁されたマグネット２１を上部プレート２２およびヨーク２３により挟み込んで内磁型の磁気回路２４を構成している。
As shown in FIG. 2, a
この磁気回路２４のヨーク２３にフレーム２６を結合している。このフレーム２６の周縁部に、請求項１記載の振動板２７の外周をエッジ２９を介して接着している。そして、この振動板２７の中心部にボイスコイル２８の一端を結合するとともに、反対の一端を上記磁気回路２４の磁気ギャップ２５にはまり込むように結合して構成している。
A
以上は、内磁型の磁気回路２４を有するスピーカについて説明したが、これに限定されず、外磁型の磁気回路を有するスピーカに適用しても良い。
In the above, the speaker having the inner magnet type
さらに、振動板２７とエッジ２９とが一体化された小型スピーカについても適用することも可能である。
Further, the present invention can be applied to a small speaker in which the
この構成により、実施の形態１において説明したように、剛性を有する竹から得られた竹繊維の強度や弾性率を確保することで材料剛性を向上させ、振動板に十分な強度や弾性率を与えることができるため、この振動板を用いてスピーカを構成することで、スピーカとしての高音質化、高信頼性化を図ることができる。 With this configuration, as described in the first embodiment, the material rigidity is improved by securing the strength and elastic modulus of bamboo fiber obtained from the bamboo having rigidity, and the diaphragm has sufficient strength and elastic modulus. Therefore, by configuring the speaker using this diaphragm, it is possible to achieve high sound quality and high reliability as a speaker.
さらに、安価で地球環境に優しいスピーカを提供することができ、性能面や品質面、信頼性面のみならず環境面やコスト面においても優れたスピーカとすることができる。 Furthermore, it is possible to provide a speaker that is inexpensive and friendly to the global environment, and can be an excellent speaker not only in terms of performance, quality, and reliability, but also in terms of environment and cost.
（実施の形態３）
以下、実施の形態３を用いて、本発明の特に請求項７に記載の発明について説明する。
(Embodiment 3)
The third aspect of the present invention will be described below with reference to the seventh embodiment.
図３は、本発明の一実施形態の電子機器であるオーディオ用のミニコンポシステムの外観図を示したものである。 FIG. 3 shows an external view of an audio minicomponent system that is an electronic apparatus according to an embodiment of the present invention.
図３に示すように、本発明のスピーカ３０をエンクロジャー４１に組込んで、スピーカシステムを構成し、このスピーカに入力する電気信号の増幅手段であるアンプ４２と、このアンプ４２に入力されるソースを出力するプレーヤ４３とを備えて、電子機器であるオーディオ用のミニコンポシステム４４を構成したものである。
As shown in FIG. 3, the
この構成とすることにより、従来では実現できなかった高音質化、高信頼性化を得るミニコンポシステムを実現することができる。 With this configuration, it is possible to realize a mini component system that achieves higher sound quality and higher reliability that could not be realized in the past.
さらに、安価で地球環境に優しいミニコンポシステムを提供することができ、性能面や品質面、信頼性面のみならず環境面やコスト面においても優れたミニコンポシステムとすることができる。 Furthermore, a mini component system that is inexpensive and friendly to the global environment can be provided, and a mini component system that is excellent not only in terms of performance, quality, and reliability, but also in terms of environment and cost can be provided.
（実施の形態４）
以下、実施の形態４を用いて、本発明の特に請求項８に記載の発明について説明する。
(Embodiment 4)
Hereinafter, the fourth aspect of the present invention will be described with reference to the fourth embodiment.
図４は、本発明の一実施形態の装置である自動車５０の断面図を示したものである。
FIG. 4 shows a cross-sectional view of an
図４に示すように、本発明のスピーカ３０をリアトレイやフロントパネルに組込んで、カーナビゲーションやカーオーディオの一部として使用して自動車５０を構成したものである。
As shown in FIG. 4, an
この構成とすることにより、スピーカ３０の高音質化、高信頼性化を得る装置を実現することができる。
By adopting this configuration, it is possible to realize a device that achieves high sound quality and high reliability of the
さらに、安価で地球環境に優しい装置を提供することができ、性能面や品質面、信頼性面のみならず環境面やコスト面においても優れた装置とすることができる。 Furthermore, an inexpensive and environmentally friendly device can be provided, and the device can be excellent not only in terms of performance, quality, and reliability, but also in terms of environment and cost.
本発明にかかるスピーカ用振動板、スピーカ、電子機器および装置は、剛性の高い振動板による音質や特性の向上や高い品質および信頼性が必要な映像音響機器や情報通信機器等の電子機器、さらには自動車等の装置に適用できる。 The loudspeaker diaphragm, the loudspeaker, the electronic device, and the device according to the present invention are electronic devices such as audiovisual equipment and information communication equipment that require improved sound quality and characteristics, and high quality and reliability due to a highly rigid diaphragm. Can be applied to devices such as automobiles.
２１ マグネット
２２ 上部プレート
２３ ヨーク
２４ 磁気回路
２５ 磁気ギャップ
２６ フレーム
２７ 振動板
２８ ボイスコイル
２９ エッジ
３０ スピーカ
４１ エンクロジャー
４２ アンプ
４３ プレーヤ
４４ ミニコンポ
５０ 自動車
21
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| JP2006339659A JP4797966B2 (en) | 2006-12-18 | 2006-12-18 | Speaker diaphragm, speaker using the same, and electronic device and apparatus using the speaker |
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| JP2006339659A JP4797966B2 (en) | 2006-12-18 | 2006-12-18 | Speaker diaphragm, speaker using the same, and electronic device and apparatus using the speaker |
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| JP2008153923A true JP2008153923A (en) | 2008-07-03 |
| JP4797966B2 JP4797966B2 (en) | 2011-10-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010016736A (en) * | 2008-07-07 | 2010-01-21 | Panasonic Corp | Speaker diaphragm, speaker using the same, electronic device and apparatus using the speaker |
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| JPH05211696A (en) * | 1992-01-31 | 1993-08-20 | Sharp Corp | Speaker diaphragm |
| JP2005269427A (en) * | 2004-03-19 | 2005-09-29 | Sony Corp | Acoustic paper diaphragm and acoustic transducer device |
| JP2006116807A (en) * | 2004-10-21 | 2006-05-11 | Kinousei Mokushitsu Shinsozai Gijutsu Kenkyu Kumiai | Acoustic material and its production method |
| JP2006325190A (en) * | 2005-04-20 | 2006-11-30 | Matsushita Electric Ind Co Ltd | Diaphragm for speaker, method for producing the same, speaker using such diaphragm and apparatus using such speaker |
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2006
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| JPH05211696A (en) * | 1992-01-31 | 1993-08-20 | Sharp Corp | Speaker diaphragm |
| JP2005269427A (en) * | 2004-03-19 | 2005-09-29 | Sony Corp | Acoustic paper diaphragm and acoustic transducer device |
| JP2006116807A (en) * | 2004-10-21 | 2006-05-11 | Kinousei Mokushitsu Shinsozai Gijutsu Kenkyu Kumiai | Acoustic material and its production method |
| JP2006325190A (en) * | 2005-04-20 | 2006-11-30 | Matsushita Electric Ind Co Ltd | Diaphragm for speaker, method for producing the same, speaker using such diaphragm and apparatus using such speaker |
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| "パルプ原料としての竹繊維の化学的研究", 大阪府立大学紀要 農学・生物学 第14巻, vol. 14, JPN6011000020, 31 March 1963 (1963-03-31), JP, pages 127 - 158, ISSN: 0001819435 * |
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| JP2010016736A (en) * | 2008-07-07 | 2010-01-21 | Panasonic Corp | Speaker diaphragm, speaker using the same, electronic device and apparatus using the speaker |
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