JP2011146769A - Method for manufacturing speaker diaphragm, and speaker diaphragm manufactured by the same - Google Patents
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Abstract
Description
本発明は、各種音響機器や映像機器に用いられるスピーカ用振動板の製造方法およびスピーカ用振動板に関するものである。 The present invention relates to a method for manufacturing a speaker diaphragm used in various audio equipment and video equipment, and a speaker diaphragm.
特に、携帯電話などの小型スピーカ用の振動板の製造方法に関するものである。 In particular, the present invention relates to a method of manufacturing a diaphragm for a small speaker such as a mobile phone.
最近、音響機器や映像機器などの電子機器において、音響ソースの充実とデジタル技術の普及により、これらの電子機器に使用されるスピーカについては、性能の向上が強く要請されている。 Recently, in electronic devices such as audio devices and video devices, due to the enhancement of sound sources and the spread of digital technology, there is a strong demand for improved performance of speakers used in these electronic devices.
一方、スピーカの構成部品の中で、振動板の性能が音質の決定に大きなウェイトを占めており、より良い音質を実現する高性能の振動板を開発することが急務である。 On the other hand, among speaker components, the performance of the diaphragm occupies a large weight in determining the sound quality, and it is an urgent need to develop a high-performance diaphragm that achieves better sound quality.
従来の小型スピーカ用振動板には樹脂フィルムが多用されている。 A resin film is frequently used for a conventional diaphragm for a small speaker.
小型スピーカに用いる振動板材料としては、ポリエチレンナフタレート(PEN)やポリエーテルイミド(PEI)が用いられてきた。 Polyethylene naphthalate (PEN) and polyetherimide (PEI) have been used as diaphragm materials used for small speakers.
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、2、3が知られている。 For example, Patent Documents 1, 2, and 3 are known as prior art document information relating to the invention of this application.
携帯電話等に使用されるスピーカは著しいスピードで小型化に向かっている。 Speakers used for cellular phones and the like are becoming smaller at a remarkable speed.
ワンセグの普及、音楽ソースの充実によって良好な音質が得られることが求められる。 It is required that good sound quality be obtained by spreading 1Seg and enhancing music sources.
この音質を良好とするための尺度として最低共振周波数ができるだけ小さいことが求められる。 As a measure for improving the sound quality, the lowest resonance frequency is required to be as small as possible.
しかしながら、一般に最低共振周波数を小さくするためには振動板の厚さを薄くする必要があり、従来材料においては、例えばPENの場合、次のような課題を有するものであった。 However, in general, in order to reduce the minimum resonance frequency, it is necessary to reduce the thickness of the diaphragm. In the case of conventional materials, for example, PEN has the following problems.
(1)結晶性が高いため、薄く成形すると寸法安定性が悪いうえ、成形時間が長くなる。 (1) Since the crystallinity is high, when it is molded thinly, the dimensional stability is poor and the molding time becomes long.
(2)薄くすると面剛性が小さくなり、ローリングなどの不良を引き起こしやすい。 (2) If it is made thinner, the surface rigidity becomes smaller, and rolling and other defects are likely to occur.
また、PEIにおいては、PENに比べて弾性率が低く、PENに比べて材厚を厚くしても、最低共振周波数を小さくすることができるものの、次のような課題を有するものであった。 PEI has a lower elastic modulus than PEN, and even if the material thickness is increased compared to PEN, the minimum resonance frequency can be reduced, but has the following problems.
(1)寸法精度が悪い。 (1) Poor dimensional accuracy.
(2)振動板のローリングが大きく、歪が増加して良好な音質が得られない。 (2) The rolling of the diaphragm is large, distortion increases, and good sound quality cannot be obtained.
(3)一般的な溶融押し出し製膜されており、膜厚精度が低く、スピーカの音質にばらつきが発生する。 (3) The film is formed by general melt extrusion, and the film thickness accuracy is low, resulting in variations in speaker sound quality.
一方で、一般的な抄紙振動板を成形する抄紙工法の場合にも、次のような課題を有するものであった。 On the other hand, even in the case of a papermaking method for forming a general papermaking diaphragm, it has the following problems.
(1)振動板の剛性の増加。 (1) Increased diaphragm rigidity.
(2)振動板の重量の増加。 (2) Increase in the weight of the diaphragm.
例えば、一般の抄紙工程では、水中で天然繊維を撹拌し、吸引ろ過を行った後、熱プレスによって振動板を成形しているが、その際に、水素結合によって振動板の弾性率は向上する。 For example, in a general papermaking process, natural fibers are stirred in water and subjected to suction filtration, and then a diaphragm is formed by hot pressing. At that time, the elastic modulus of the diaphragm is improved by hydrogen bonding. .
その結果、最低共振周波数が上昇し、低域再生帯域が狭まってしまう。 As a result, the minimum resonance frequency increases and the low frequency reproduction band is narrowed.
ここで、このような場合に改善策として採用されるのが、ダンプ剤の塗布であり、このような手法を採用すれば、再生帯域は改善するものの、振動系の重量増加につながり、音圧の低下を招いてしまうという課題を有するものであった。 Here, the application of the dumping agent is adopted as an improvement measure in such a case. If such a method is adopted, the reproduction band is improved, but the weight of the vibration system is increased, and the sound pressure is increased. It has the subject of causing the fall of.
上記課題を解決するために、本発明は、抄紙工程を備えたスピーカ用振動板の製造方法であり、振動板材料を含水して繊維を抄紙する抄紙工程と、抄紙した材料を乾燥させて水分を蒸発させる予備乾燥工程と、予備乾燥工程により得られた予備成形物をプレス成形するプレス成形工程とを備え、プレス成形により振動板材料の繊維の結合状態を破壊させて弾性率を低くしてスピーカ用振動板の製造方法としたものである。 In order to solve the above-mentioned problems, the present invention is a method for manufacturing a diaphragm for a speaker provided with a papermaking process. A pre-drying step for evaporating and a press-forming step for press-molding the preform obtained by the pre-drying step, and the elastic modulus is lowered by breaking the bonded state of the fibers of the diaphragm material by press molding. This is a method for manufacturing a speaker diaphragm.
以上のように、予備乾燥工程後に、プレス成形により振動板材料の繊維の結合状態を破壊させて弾性率を低くしてスピーカ用振動板を構成させることにより、スピーカ用振動板の弾性率を低下させ、最低共振周波数を低くすることができる。 As described above, after the pre-drying step, the elastic modulus of the speaker diaphragm is decreased by forming the speaker diaphragm by breaking the bonded state of the fibers of the diaphragm material by press molding to lower the elastic modulus. And the lowest resonance frequency can be lowered.
以上のように、本発明の工法で成形されるスピーカ用振動板は、弾性率が低く、最低共振周波数を低くし、より豊かな低音を再生することができる。 As described above, the speaker diaphragm formed by the method of the present invention has a low elastic modulus, a minimum resonance frequency can be lowered, and a richer bass can be reproduced.
以下、本発明のスピーカ用振動板の製造方法及びスピーカ用振動板について図面を用いて説明する。 Hereinafter, a method for manufacturing a speaker diaphragm and a speaker diaphragm of the present invention will be described with reference to the drawings.
図1は本発明のスピーカ用振動板を製造するためのプロセスチャートである。 FIG. 1 is a process chart for manufacturing the speaker diaphragm of the present invention.
以下図面を参照しながら、製造方法の各ステップについて説明する。 Hereinafter, each step of the manufacturing method will be described with reference to the drawings.
Aステップは、材料の天然繊維1A及び合成繊維1Bを含水させる工程である。
The A step is a process of containing the natural fiber 1A and the
Bステップは、Aステップの材料を抄紙する抄紙工程である。 The B step is a paper making process for making the material of the A step.
Cステップは、Bステップで抄紙された材料を乾燥させて水分を蒸発させる予備乾燥工程である。 The C step is a preliminary drying step in which the material made in the B step is dried to evaporate water.
Dステップは、Cステップで得られた予備成形物をプレス成形により繊維の結合状態を破壊するための工程である。 The D step is a process for breaking the bonded state of the preform by press molding the preform obtained in the C step.
図2は本発明の一実施形態の振動板の斜視断面図を示したもの、図3は本発明の一実施形態の振動板の平面図を示したものである。 FIG. 2 is a perspective sectional view of a diaphragm according to an embodiment of the present invention, and FIG. 3 is a plan view of the diaphragm according to an embodiment of the present invention.
図2および図3に示すように振動板1は、図1に示すプロセスに従い成形され、予備乾燥工程後に、プレス成形により振動板材料の繊維の結合状態を破壊させて弾性率を低くしてスピーカ用振動板を構成させることにより、スピーカ用振動板の弾性率を低下させ、最低共振周波数を低くすることができ、その結果、より豊かな低音を再生することができる。 As shown in FIGS. 2 and 3, the diaphragm 1 is molded in accordance with the process shown in FIG. 1, and after the preliminary drying step, the bonded state of the fibers of the diaphragm material is broken by press molding to lower the elastic modulus. By configuring the diaphragm for the sound, the elastic modulus of the diaphragm for the speaker can be lowered and the lowest resonance frequency can be lowered, and as a result, a richer bass can be reproduced.
ここで、従来の抄紙振動板との違いについて説明すると、従来の製造方法では、プレス成形前に予備乾燥工程を設けることがないことから、プレス成形時には、振動板材料の繊維中に十分な水分を含んでおり、この状態で加熱プレスを実施しているため、プレス時には繊維の結合状態を破壊させることなく、水分を蒸発させて圧縮することで、弾性率を向上させている。 Here, the difference from the conventional papermaking diaphragm will be explained. Since the conventional manufacturing method does not provide a preliminary drying step before press molding, sufficient moisture is contained in the fibers of the diaphragm material during press molding. Since the heat press is performed in this state, the elastic modulus is improved by evaporating and compressing moisture without destroying the bonded state of the fibers at the time of pressing.
この従来の製造方法に比べ、本発明は、予備乾燥工程により、ほとんどの水分を蒸発させてからプレス成形することで、振動板材料の繊維の結合状態を破壊させて弾性率が低くなるようにしている。 Compared to this conventional manufacturing method, the present invention has a pre-drying process in which most of the water is evaporated and then press-molded, so that the bonded state of the fibers of the diaphragm material is broken and the elastic modulus is lowered. ing.
よって、プレス成形するときのプレス圧についても、振動板材料の繊維の結合状態を破壊させるに必要な圧力設定としている。 Therefore, the press pressure at the time of press molding is also set to a pressure necessary for breaking the bonded state of the fibers of the diaphragm material.
この振動板1について天然繊維1Aには、木材であれば針葉樹、広葉樹、非木材であれば竹、ケナフ、ジュート、バガスなど様々な繊維を用いて構成され、音質の調整をすることが可能となる。 The natural fiber 1A of the diaphragm 1 is composed of various fibers such as coniferous trees, broad-leaved trees if wood, and bamboo, kenaf, jute, bagasse, etc., so that the sound quality can be adjusted. Become.
天然繊維1Aは、カナダ標準濾水度による叩解度が200ml以上で、かつ700ml以下のレベルに叩解した繊維であれば、骨子として適度な剛性を保有し、抄紙時にフロッグの形成などの抄紙ムラが生じにくいため、合成繊維との混抄が可能である。 If natural fiber 1A is a fiber that has been beaten to a level of 200 ml or more and 700 ml or less according to the Canadian standard freeness, it has moderate rigidity as a skeleton, and papermaking unevenness such as frog formation during papermaking. Since it does not easily occur, it can be mixed with synthetic fibers.
ここで、叩解度が200ml以下では抄紙時に濾水速度が低くなり、生産性が著しく低下する。 Here, when the beating degree is 200 ml or less, the drainage speed becomes low during paper making, and the productivity is remarkably lowered.
一方、700ml以上になると、繊維同士の絡み合いが低くなるため、期待する効果を得られにくい。 On the other hand, when the amount is 700 ml or more, the entanglement between the fibers becomes low, so that it is difficult to obtain the expected effect.
天然繊維を叩解する手法としては、ディスクリファイナー、ビーター等の方法がある。 As a method of beating natural fibers, there are methods such as a disc refiner and a beater.
天然繊維1Aの繊維長は0.8mm以上で、かつ3mm以下の天然繊維であれば、骨子としての補強効果を十分に期待でき、また混抄した際の抄紙ムラも抑制できる。 If the natural fiber 1A has a fiber length of 0.8 mm or more and 3 mm or less, the reinforcing effect as the main point can be sufficiently expected, and unevenness in papermaking when mixed paper can be suppressed.
ここで、繊維長が0.8mm以下であれば、抄紙した予備成形物の強度が不十分であり、十分な特性を得ることができない。 Here, if the fiber length is 0.8 mm or less, the strength of the paper-made preform is insufficient, and sufficient characteristics cannot be obtained.
一方で、3mm以上であれば、混抄時にフロッグを形成し、分散性の低下、成形品の外観不良を招く。 On the other hand, if it is 3 mm or more, a frog will be formed at the time of mixing, resulting in a decrease in dispersibility and a poor appearance of the molded product.
合成繊維1Bには、ポリエステル繊維、ポリオレフィン繊維、アクリル繊維、アラミド繊維、ビニロン繊維、レーヨン繊維、ナイロン繊維などの群から選択され、使用される。
The
合成繊維1Bは、成形性の付与、透気度の向上、ピンホールの抑制等を可能とすることができる。
合成繊維に対する天然繊維の配合量は、5%〜90%が望ましい。 The blending amount of the natural fiber with respect to the synthetic fiber is desirably 5% to 90%.
上記配合で振動板を成形すれば、十分な内部損失を保持しながら、振動板の低弾性率化が可能となり、その結果、低域再生帯域を向上させることができる。 If the diaphragm is molded with the above composition, it is possible to reduce the elastic modulus of the diaphragm while maintaining a sufficient internal loss, and as a result, it is possible to improve the low-frequency reproduction band.
配合量が5%以下の場合、天然繊維の含有量が著しく低くなるため、内部損失が低下し天然繊維ならではのぬくもりある音質を得ることができない。 When the blending amount is 5% or less, the content of natural fibers is remarkably reduced, so that the internal loss is reduced and the warm sound quality unique to natural fibers cannot be obtained.
一方、配合量が90%以上の場合、振動板の弾性率が高くなりすぎるため、十分な低域再生特性を得られない。 On the other hand, when the blending amount is 90% or more, the elastic modulus of the diaphragm becomes too high, and sufficient low-frequency reproduction characteristics cannot be obtained.
また、合成繊維1Bは天然繊維と同様に叩解処理を施し、表面積を向上することによって得られる相互作用もある。
In addition, the
振動板1の密度は、0.25g/cm3〜0.90g/cm3の間で成形されれば、紙本来が有する柔らかさや軽さを損なうことなく成形することが可能である。 The density of the diaphragm 1, be molded between 0.25g / cm 3 ~0.90g / cm 3 , it is possible to mold without compromising the softness and lightness inherent paper.
その結果、弾性率が低く、低域再生能力に優れた振動板を得ることができる。 As a result, it is possible to obtain a diaphragm having a low elastic modulus and excellent low-frequency reproduction capability.
しかし、0.25g/cm3以下の場合、強度が著しく低下するため、高周波域での面鳴きなど、強度不足による異音が生じる。 However, when the strength is 0.25 g / cm 3 or less, the strength is remarkably reduced, and thus abnormal noise due to lack of strength such as surface noise in a high frequency region occurs.
また、0.90g/cm3以上の場合、密度が樹脂振動板相当となり、抄紙振動板の特長である軽さの面で優位性を得られず、音圧の低下など特性の悪化を招く。 When the density is 0.90 g / cm 3 or more, the density is equivalent to that of a resin diaphragm, and the advantage in terms of lightness, which is a feature of the papermaking diaphragm, cannot be obtained, leading to deterioration of characteristics such as a decrease in sound pressure.
更には、低環境負荷という点で、天然繊維1Aには木材繊維よりも非木材繊維を採用することが望ましい。 Furthermore, it is desirable to employ non-wood fibers rather than wood fibers for the natural fibers 1A in terms of low environmental load.
数ある非木材繊維の中でも竹繊維は、生育が早いため環境問題を発生させることが少なく、継続的に供給可能である点や、ガラス繊維等の無機分のように埋め立てることなく焼却によって廃棄できるため地球環境に優しい。 Among the many non-wood fibers, bamboo fiber grows quickly, so it does not cause environmental problems, can be continuously supplied, and can be disposed of by incineration without being buried like inorganic components such as glass fiber. Because it is environmentally friendly.
天然繊維1Aの材料として竹繊維を用いる場合、竹齢1年以上の竹から得られた竹繊維を使用することが望ましい。 When bamboo fiber is used as the material of the natural fiber 1A, it is desirable to use bamboo fiber obtained from bamboo that is one year old or older.
一般に、竹は生後50日ほどで成長し、その後は材として安定化を図る。 In general, bamboo grows about 50 days after birth, and then stabilizes as a material.
ほぼ1年以上経過すれば安定した材を得ることができるため、音響用部材として所望の特性を得ることができる。 Since a stable material can be obtained after almost one year has passed, desired characteristics as an acoustic member can be obtained.
しかし、いくら成長速度に長けた竹であったとしても、生後1年以内に伐採を続けると、竹林が安定して成長せず、竹の生態系を乱してしまうことが懸念される。 However, no matter how fast the bamboo grows, there is a concern that if the logging continues within the first year of life, the bamboo forest will not grow stably and disturb the bamboo ecosystem.
次に、竹繊維に含まれるリグニンの含有量は25%以下であることが望ましい。 Next, it is desirable that the content of lignin contained in the bamboo fiber is 25% or less.
リグニンの含有量が25%以下であれば、内部損出の高い振動板を得ることができるため、非常に艶やかな音質を奏でる振動板を得ることができる。 If the content of lignin is 25% or less, a diaphragm with high internal loss can be obtained, so that a diaphragm having a very glossy sound quality can be obtained.
しかし、リグニンの含有量が25%以上の場合、竹繊維表面には過度のリグニンを含有するため、竹繊維同士の接着が阻害され、振動板として成形する際に、強度が不足し、成形することが困難となる。 However, when the lignin content is 25% or more, the bamboo fiber surface contains excessive lignin, so that the adhesion between the bamboo fibers is hindered, and the strength is insufficient when molding as a diaphragm. It becomes difficult.
更に、音質面で効果的に向上させる手段として、天然繊維1Aに竹繊維を採用し、更に補助材料として、ミクロフィブリル状態まで微細化した竹繊維を添加することが望ましい。 Furthermore, as means for effectively improving the sound quality, it is desirable to use bamboo fiber as the natural fiber 1A and further add bamboo fiber refined to a microfibril state as an auxiliary material.
その添加の割合は、ミクロフィブリル状態まで小さくした竹繊維を5wt%〜20wt%添加することが望ましい。 As for the ratio of the addition, it is desirable to add 5 wt% to 20 wt% of bamboo fiber reduced to a microfibril state.
5wt%〜20wt%の間であれば、繊維同士を結び付けるバインダーとして効果的な補強効果を得ることができる。 If it is between 5 wt%-20 wt%, the reinforcement effect effective as a binder which connects fibers can be acquired.
また、繊維間の目止め剤として有効に作用し、ピンホールの抑制による音圧の向上を図ることができる。 Moreover, it acts effectively as a sealing agent between fibers and can improve sound pressure by suppressing pinholes.
しかし、上記ミクロフィブリル状態まで微細化した竹繊維の添加量が、5wt%以下であれば、添加量が少な過ぎるため十分な補強効果を得られない。 However, if the amount of bamboo fiber refined to the microfibril state is 5 wt% or less, the amount of addition is too small to obtain a sufficient reinforcing effect.
一方で、20wt%以上であれば、抄紙時にフロッグを形成し、分散性の低下、成形性の低下を招く。 On the other hand, if it is 20 wt% or more, a frog is formed at the time of papermaking, resulting in a decrease in dispersibility and a decrease in moldability.
また、過度に添加するとミクロフィブリル状態まで微細化する竹繊維の製造コストが増加するとともに、その繊維を抄紙する際にタクトが長くなるため抄紙コストが著しく増加してしまう。 Moreover, when it adds excessively, the manufacturing cost of the bamboo fiber refined | miniaturized to a microfibril state will increase, and since a tact will become long when paper-making the fiber, paper-making cost will increase remarkably.
よって、適正な添加量は、5wt%〜20wt%が望ましい。 Therefore, the appropriate addition amount is desirably 5 wt% to 20 wt%.
また、ミクロフィブリル状態まで微細化した竹繊維の繊維長は、0.8mm以下まで微細化すれば、十分に微細化されており、所望の補強効果を得ることができる。 Moreover, if the fiber length of the bamboo fiber refined | miniaturized to the microfibril state is refined | miniaturized to 0.8 mm or less, it will be fully refined | miniaturized and the desired reinforcement effect can be acquired.
しかし、0.8mm以上の繊維長であれば、竹繊維が十分に叩解されていないため、補強効果が乏しい。 However, if the fiber length is 0.8 mm or longer, the bamboo fiber is not sufficiently beaten, so that the reinforcing effect is poor.
更に、上記、ミクロフィブリル状態まで小さくした竹繊維の叩解度は、200ml以下であることが望ましい。 Furthermore, the beating degree of the bamboo fiber reduced to the microfibril state is desirably 200 ml or less.
叩解度を200ml以下にすれば、通常の竹繊維に比べて圧倒的な補強効果やピンホールを抑制するための目止め剤としての効果を得ることができる。 If the beating degree is 200 ml or less, an overwhelming reinforcing effect and an effect as a sealant for suppressing pinholes can be obtained compared to ordinary bamboo fibers.
その結果、少量の添加量であったとしても、優れた費用対効果を得ることができる。 As a result, even if the addition amount is small, an excellent cost-effectiveness can be obtained.
しかし、200ml以上であれば、一般的な竹繊維と比較して同等の特性であり、ミクロフィブリル繊維ならではの、補強効果や目止めの効果を得ることができない。 However, if it is 200 ml or more, it has the same characteristics as a general bamboo fiber, and it is impossible to obtain a reinforcing effect and a sealing effect unique to a microfibril fiber.
更に、必要に応じて充填材、フィラー、無機繊維、防水剤、顔料などを配合して音質調整をすることも可能である。 Furthermore, it is also possible to adjust the sound quality by blending fillers, fillers, inorganic fibers, waterproofing agents, pigments and the like as required.
上記フィラーは、炭酸カルシウム、珪藻土、タルク、水酸化アルミニウム、炭化された天然繊維を添加することが望ましい。 The filler is preferably added with calcium carbonate, diatomaceous earth, talc, aluminum hydroxide, and carbonized natural fiber.
炭酸カルシウムの添加量は、5wt%〜20wt%が望ましく、この添加量にすれば、抄紙時に内填剤として使用する際に、ピンホールの抑制などの効果を発揮させることができる。 The addition amount of calcium carbonate is desirably 5 wt% to 20 wt%. If this addition amount is used, effects such as suppression of pinholes can be exhibited when used as an inner filler during papermaking.
ここで、5wt%以下の添加量の場合、内填剤として効果的な作用を得ることができない。 Here, when the addition amount is 5 wt% or less, it is not possible to obtain an effective action as an internal filler.
一方、20wt%以上の場合、抄紙ムラ、外観不良、比重の増加など様々なデメリットが生じる。 On the other hand, when it is 20 wt% or more, various disadvantages such as uneven papermaking, poor appearance, and increased specific gravity occur.
珪藻土の添加量は、5wt%〜20wt%が望ましく、抄紙時に内填剤として使用する際に、ピンホールの抑制などの効果を発揮させることができる。 The addition amount of diatomaceous earth is desirably 5 wt% to 20 wt%, and when used as an filler during papermaking, effects such as suppression of pinholes can be exhibited.
ここで、5wt%以下の添加量の場合、内填剤として効果的な作用を得ることができない。 Here, when the addition amount is 5 wt% or less, it is not possible to obtain an effective action as an internal filler.
一方、20wt%以上の場合、抄紙ムラ、外観不良、比重の増加など様々なデメリットが生じる。 On the other hand, when it is 20 wt% or more, various disadvantages such as uneven papermaking, poor appearance, and increased specific gravity occur.
タルクの添加量は、5wt%〜20wt%が望ましく、この添加量にすれば、抄紙時に内填剤として使用する際に、無機材料ならではの高域の音質の調整ができる。 The amount of talc added is desirably 5 wt% to 20 wt%, and when this amount is added, the high-frequency sound quality unique to inorganic materials can be adjusted when used as an internal filler during papermaking.
ここで、5wt%以下の添加量の場合、内填剤として効果的な作用を得ることができない。 Here, when the addition amount is 5 wt% or less, it is not possible to obtain an effective action as an internal filler.
一方、20wt%以上の場合、抄紙ムラ、外観不良、比重の増加など様々なデメリットが生じる。 On the other hand, when it is 20 wt% or more, various disadvantages such as uneven papermaking, poor appearance, and increased specific gravity occur.
水酸化アルミニウムの添加量は、5wt%〜20wt%が望ましく、この添加量にすれば、抄紙時に添加剤として使用する際に、無機材料ならではの高域の音質の調整ができる。 The addition amount of aluminum hydroxide is desirably 5 wt% to 20 wt%. When this addition amount is used, the high-frequency sound quality unique to inorganic materials can be adjusted when used as an additive during papermaking.
ここで、5wt%以下の添加量の場合、添加剤として効果的な作用を得ることができない。 Here, when the addition amount is 5 wt% or less, it is impossible to obtain an effective action as an additive.
一方、20wt%以上の場合、抄紙ムラ、外観不良、比重の増加など様々なデメリットが生じる。 On the other hand, when it is 20 wt% or more, various disadvantages such as uneven papermaking, poor appearance, and increased specific gravity occur.
更に、含浸処理、ラミネートなどによって音質を向上させることも可能である。 Furthermore, it is possible to improve sound quality by impregnation treatment, lamination and the like.
これらの音質調整材料を添加することで、精度が高く、高音質を実現できるスピーカ用振動板を提供することが可能となる。 By adding these sound quality adjusting materials, it is possible to provide a loudspeaker diaphragm capable of realizing high sound quality with high accuracy.
本製造方法で得られるスピーカ用振動板は、特に、携帯電話など小型スピーカにおいてその特性を顕著に発揮することができる。 The speaker diaphragm obtained by this manufacturing method can remarkably exhibit the characteristics particularly in a small speaker such as a mobile phone.
形状においても円形、矩形、楕円形など様々な形状で成形することができる。 The shape can be formed in various shapes such as a circle, a rectangle, and an ellipse.
本発明にかかるスピーカ用振動板の製造方法およびこのスピーカ用振動板の製造方法により製造されたスピーカ用振動板は、高音質化と高信頼性化の両立が必要なスピーカ用振動板に適用できる。 The speaker diaphragm manufacturing method according to the present invention and the speaker diaphragm manufactured by the speaker diaphragm manufacturing method can be applied to a speaker diaphragm that requires both high sound quality and high reliability. .
1 振動板
1A 天然繊維
1B 合成繊維
1 Diaphragm 1A
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