JPS6180999A

JPS6180999A - Voice coil for speaker

Info

Publication number: JPS6180999A
Application number: JP20378084A
Authority: JP
Inventors: Yoshiaki Yonetani; 米谷　圭亮
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 1984-09-27
Filing date: 1984-09-27
Publication date: 1986-04-24

Abstract

PURPOSE:To manufacture the titled voice coil having light weight and is superior in heat resistance and moisture resistance at low cost, by winding a conductor around a bobbin which is wound spirally with a composite sheet made of natural and synthetic fiber blend and impregnated with a thermosetting resin. CONSTITUTION:Natural fiber 2 is dispersed and beaten, and synthetic fiber 3 is blended up to the ratio of 15-30wt%. The synthetic fiber is a heat resistant polyester with length of 4-6mm, and thickness of 1-2 denier. The blended fibers are made paper and dried. Outside sheet 4 and inside sheet 4' are made by the paper. And then, a bobbin 7 is made by spirally winding the outer sheet 4 on the inside sheet 4' and adhering an adhesive 6. Also a voice coil 8 is wound around the outside sheet 4 and adhered by adhesive 6'. In this way, light weight, heat resistant and moisture resistant product is manufactured at low cost. The product is suitable for car and outside use.

Description

【発明の詳細な説明】産業上の利用分野本発明は、各種音器機器に使用されるスピーカ用ボイス
コイルに係り、特にコイルのボビンに関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a voice coil for a speaker used in various sound instruments, and particularly to a bobbin of the coil.

従来例の構成とその問題点スピーカ用ボイスコイルのボビンの基材としては、従来
屋外用或は車載用スピーカには耐湿性と耐熱性に対して
伸縮率の小さいアルミニウムやガラス繊維入りポリアミ
ド樹脂が使用され、屋内用のスピーカには、ペーパポビ
ンが多く使用されている。前者のボビンは重量が重く、
製造の合理化が困難で、価格が高い等の欠点があり、又
後者は５重量が軽く、スパイラル巻きして製造の合理化
が可能で、価格も安い、等の利点がある。このようなペ
ーパボビンを使用したボイスコイルの構成の一例を第６
図に示す、同図はボイスコイルの断面図で、内側のシー
ト材１１と外側のシート材１２に接着剤１３を塗布して
、スパイラル巻きしてボビンを構成し、これに電線１４
を巻回して構成されている。このようなペーパポビンを
使用したボイスコイルは温湿度テストを繰り返すと、第
７図のようにボビンがふくれて変形する欠点がある。Conventional structure and its problems As the base material for speaker voice coil bobbins, aluminum and glass fiber-containing polyamide resin, which have a low expansion and contraction rate in terms of moisture resistance and heat resistance, have traditionally been used for outdoor or car speakers. Paper pobins are often used for indoor speakers. The former bobbin is heavy;
It has disadvantages such as difficulty in rationalizing production and high price, while the latter has advantages such as being light in weight, allowing for rationalization of manufacturing by spiral winding, and low price. An example of the configuration of a voice coil using such a paper bobbin is shown in Part 6.
This figure is a cross-sectional view of the voice coil. An inner sheet material 11 and an outer sheet material 12 are coated with an adhesive 13 and spirally wound to form a bobbin.
It is constructed by winding. A voice coil using such a paper bobbin has the disadvantage that the bobbin swells and becomes deformed as shown in FIG. 7 when temperature and humidity tests are repeated.

発明の目的本発明は、上述のように従来のボイスコイルのボビンに
は種々の問題があることに鑑み、耐熱性、耐湿性に優れ
、重量が軽く、且つスパイラル巻きが容易で、安価に作
ることのできるボイスコイルを提供することを目的とす
るものである。Purpose of the Invention In view of the various problems with conventional voice coil bobbins as described above, the present invention provides a bobbin that has excellent heat resistance and moisture resistance, is light in weight, is easy to spirally wind, and is manufactured at low cost. The purpose of this invention is to provide a voice coil that can perform

発明の構成本発明は、天然ｔａ維に耐熱性ポリエステル繊維を１５
〜３０ｗｔ％混抄して得られた複合シートに熱硬化性樹
脂を含浸し、そのシートをスパイラル“４、　、′ 巻きしたボビンに導線を巻回してボイスコイルを構成す
るものである。このようにして構成されたボイスコイル
は、軽くて耐熱性、耐温性に優れ、且つ価格も安く作る
ことができる、等の特長を有する。Structure of the Invention The present invention combines natural ta fibers with heat-resistant polyester fibers.
A voice coil is constructed by impregnating a thermosetting resin into a composite sheet obtained by mixing ~30 wt%, and winding a conducting wire around a bobbin made by spirally winding the sheet. The voice coil constructed with this structure has the following features: it is light, has excellent heat resistance, and can be manufactured at a low price.

実施例の説明第１図は本発明のボイスコイルの一実施例の一冊切断側
面図、第２図は要部の拡大断面図である。次にその構成
を第３図及び第４図を参照してその製造方法と共に説明
する。DESCRIPTION OF THE EMBODIMENTS FIG. 1 is a cut-away side view of an embodiment of the voice coil of the present invention, and FIG. 2 is an enlarged sectional view of the main parts. Next, its structure will be explained together with its manufacturing method with reference to FIGS. 3 and 4.

第３図は本発明のボイスコイルに使用される複合シート
の製造工程を示す図である。まず、Ａの工程で、ビータ
ａ　ｌにより天然ｍａｚを離解し、次にＢの工程で、離
解された天然繊、Ｉ１２を叩解し、Ｃの工程で、これに
合成繊ｍ３を天然繊維に対して１５〜３０ｗｔ％の割合
で添加する。ここで添加される合成繊維としては、耐熱
性ポリエステル繊維で、−例として繊維の長さが４〜６
ｍｍ、太さが　１．０〜２．Ｏｄ　（デニール）のもの
を使用する。次にこれを抄紙し、更に乾燥工程を経て、
複合シート４を得、所要形状の内側シートと外側シート
を作る。FIG. 3 is a diagram showing the manufacturing process of a composite sheet used in the voice coil of the present invention. First, in step A, natural maz is defibrated using a beater al, then in step B, the defibrated natural fiber, I12, is beaten, and in step C, synthetic fiber m3 is added to the natural fiber. It is added at a rate of 15 to 30 wt%. The synthetic fibers added here are heat-resistant polyester fibers, for example, the length of the fibers is 4 to 6.
mm, thickness 1.0~2. Use Od (denier). Next, this is made into paper, and then goes through a drying process.
A composite sheet 4 is obtained, and an inner sheet and an outer sheet of a desired shape are made.

第４図は上述のようにして作られた複合シートをスパイ
ラル巻きしてボビンを作る工程を示すもので、外側ボビ
ンとなる複合シート４と、内側ボビンとなる複合シート
ｌにそれぞれ濃度２０〜２５％の熱硬化性のフェノール
樹脂５を１５〜２０％の含浸率で含浸し、含浸後の比重
が０．８〜１．０（ｇ／ｃｒｎ’）になるようにする。Fig. 4 shows the process of spirally winding the composite sheet made as described above to make a bobbin.The composite sheet 4, which will become the outer bobbin, and the composite sheet L, which will become the inner bobbin, each have a density of 20 to 25%. % thermosetting phenolic resin 5 at an impregnation rate of 15 to 20%, and the specific gravity after impregnation is made to be 0.8 to 1.0 (g/crn').

次に含浸された内側ボビンとなる複合シート４と外側ボ
ビンとなる複合シート４′を風乾後、２００°Ｃで３分
間強制乾燥する。Next, the impregnated composite sheet 4 that will become the inner bobbin and the composite sheet 4' that will become the outer bobbin are air-dried and then force-dried at 200° C. for 3 minutes.

次に外側ボビンとなる複合シート４の外側に接着剤（ポ
リアミド樹脂）６をコーティングして、６０〜７０℃の
雰囲気中で、２〜３分間乾燥する。Next, an adhesive (polyamide resin) 6 is coated on the outside of the composite sheet 4 that will become the outer bobbin, and dried for 2 to 3 minutes in an atmosphere of 60 to 70°C.

次に外側ボビンと内側ボビンとのスパイラル巻き工程に
入る前に、内側ボビンとなる複合シート４′の外側に接
着剤（ポリアミド樹脂）６をコーティングして、次の工
程でスパイラル巻きしてコイルボビンを作る。Next, before starting the spiral winding process between the outer bobbin and the inner bobbin, the outer side of the composite sheet 4' that will become the inner bobbin is coated with an adhesive (polyamide resin) 6, and in the next process, it is spirally wound to form a coil bobbin. make.

第１図はこのようにして作られたコイルボビン７に′ｌ
＠線８を巻回したボイスコイルの一部切断側面図である
。又、第２図はその要部Ａの拡大断面図である。Figure 1 shows the coil bobbin 7 made in this way.
FIG. 2 is a partially cutaway side view of the voice coil around which the @ wire 8 is wound. Moreover, FIG. 2 is an enlarged sectional view of the main part A.

以上のようにして作られた本発明のボイスコイルのボビ
ンと、従来のペーパボビンの温湿度試験を、４６℃、９
７％ＲＨで５０分間、次に常温で１０分間、更に８５℃
、３０％ＲＨで５０分間の順序で繰り返し、１３サイク
ル繰り返した後のボビンの収縮率を比較測定した結果の
実測値を次の表１に示す。The voice coil bobbin of the present invention made as described above and the conventional paper bobbin were subjected to temperature and humidity tests at 46°C and 90°C.
50 minutes at 7% RH, then 10 minutes at room temperature, then 85℃
, 30% RH for 50 minutes, and after 13 cycles, the shrinkage rate of the bobbin was compared and measured, and the actual measured values are shown in Table 1 below.

表　　１表１より本発明のボビンでは従来のペーパボビンに比べ
て収縮率が著しく改善されたことが判る。Table 1 It can be seen from Table 1 that the shrinkage rate of the bobbin of the present invention was significantly improved compared to the conventional paper bobbin.

第５図は、本発明において、天然繊維に対して添加され
る合成繊維の添加率と、ボビンにした時の収縮率及び比
重の関係を測定したグラフであり、横軸は天然パルプに
対するポリエステル樹脂の配合比（ｗｔ％）、縦軸は収
縮率及び比重を示す。このグラフから天然繊維に対する
合成ｔａ維の混抄割合は、天然繊維を７０〜８５％で、
合成繊維を１５〜３０％とすることが収縮率及び比重の
点から最適であることが判る。Figure 5 is a graph measuring the relationship between the addition rate of synthetic fibers added to natural fibers and the shrinkage rate and specific gravity when made into a bobbin in the present invention, and the horizontal axis is the polyester resin relative to natural pulp. The blending ratio (wt%), the vertical axis shows the shrinkage rate and specific gravity. From this graph, the mixing ratio of synthetic TA fiber to natural fiber is 70 to 85%,
It can be seen that 15 to 30% of synthetic fiber is optimal in terms of shrinkage rate and specific gravity.

なお、ボビン材として従来使用されているアルミニウム
、及びガラス繊維入りポリアミド樹脂と、本発明による
ボビン材゛の比重の比較を表２に示し、又これらのボビ
ン材を使用したボビンの価格を表３に示す、なお表３は
ボビンの直径が２５ｍｍとした時のボビンの単価である
。Table 2 shows a comparison of the specific gravity of the bobbin material of the present invention with aluminum and glass fiber-filled polyamide resin conventionally used as bobbin materials, and Table 3 shows the prices of bobbins using these bobbin materials. Table 3 shows the unit price of the bobbin when the diameter of the bobbin is 25 mm.

表　　２表　　３発明の効果以上のように本発明のボイスコイルは、そのボビンが内
側ボビン、外側ボビン共に、合成繊維を配合した複合シ
ートで作られ、これに熱硬化性樹脂を含浸しているため
、耐熱性、耐湿性に優れ、又、軽量で１価格も安く作ら
れるため、屋外用或いは車載用スピーカのボイスコイル
として使用して、工業的価値の大なるものである。Table 2 Table 3 Effects of the Invention As described above, in the voice coil of the present invention, both the inner and outer bobbins are made of a composite sheet containing synthetic fibers, which is impregnated with a thermosetting resin. Therefore, it has excellent heat resistance and moisture resistance, and is lightweight and inexpensive, so it has great industrial value when used as a voice coil for outdoor or car speakers.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明のスピーカ用ボイスコイルの一実施例の
一部切断側面図、第２図はその要部の拡大断面図、第３
図は本発明のボイスコイルに使用される複合シートの製
造工程を示す図、第４図は複合シートからボビンを作る
製造工程を示す図、第５図はボビンを構成する天然繊維
と合成Ｆｊ＆雄の混抄割合と、ボビンの収縮率及び比重
の関係を示すグラフ、第６図は従来のペーパボビンを使
用したボイスコイルの一部切断側面図、第７図は、第６
図のコイルが温湿度テストで変形した状態を示す斜視図
である。１・・・ビータ機　　２・・・天然繊Ｎ＆３・・・合成
繊維４・・・複合シート　　５・・・熱−硬化性樹脂６
・・・接着剤　　７・・・ボビン　　８・・・銅線代理
人の氏名　　弁理士　　吉　崎　悦　冶第１図第３図第４図タト伸ツボ′ビン　　　　　　　　　　　　　　　　内
布１ポ゛ビン第５図FIG. 1 is a partially cutaway side view of an embodiment of the voice coil for a speaker according to the present invention, FIG. 2 is an enlarged sectional view of the main part thereof, and FIG.
Figure 4 shows the manufacturing process of a composite sheet used in the voice coil of the present invention, Figure 4 shows the manufacturing process of making a bobbin from the composite sheet, and Figure 5 shows the manufacturing process of the natural fibers and synthetic Fj & male fibers that make up the bobbin. A graph showing the relationship between the paper mixing ratio and the shrinkage rate and specific gravity of the bobbin. Figure 6 is a partially cutaway side view of a voice coil using a conventional paper bobbin.
FIG. 3 is a perspective view showing a state in which the coil shown in the figure is deformed in a temperature/humidity test. 1... Beater machine 2... Natural fiber N & 3... Synthetic fiber 4... Composite sheet 5... Thermosetting resin 6
... Adhesive 7 ... Bobbin 8 ... Name of copper wire agent Patent attorney Etsuji Yoshizaki Fig. 1 Fig. 3 Fig. 4 Tato stretching pot' bottle Inner cloth 1 Pobin Fig. 5

Claims

【特許請求の範囲】[Claims]

天然繊維に合成繊維を１５〜３０ｗｔ％混抄した複合シ
ートに熱硬化性樹脂を含浸して、その比重が０．８〜１
．０のものをスパイラル巻きしたボビンに導線を巻回し
て成るスピーカ用ボイスコイル。A composite sheet made by mixing 15 to 30 wt% of synthetic fibers with natural fibers is impregnated with thermosetting resin, and its specific gravity is 0.8 to 1.
．． A speaker voice coil made by winding a conducting wire around a spirally wound bobbin.