JPS5927151B2 - Manufacturing method of speaker diaphragm - Google Patents
Manufacturing method of speaker diaphragmInfo
- Publication number
- JPS5927151B2 JPS5927151B2 JP3180280A JP3180280A JPS5927151B2 JP S5927151 B2 JPS5927151 B2 JP S5927151B2 JP 3180280 A JP3180280 A JP 3180280A JP 3180280 A JP3180280 A JP 3180280A JP S5927151 B2 JPS5927151 B2 JP S5927151B2
- Authority
- JP
- Japan
- Prior art keywords
- manufacturing
- sheet
- mold
- diaphragm
- protrusion
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
- H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Description
【発明の詳細な説明】
本発明は熱可塑性樹脂を主体とするシートを加熱した後
プレスするスピーカ用振動板の製造方法に関し、振動板
のコイルボビンの固定部よりエッジ部にかけて厚さが均
一になるスピーカ用振動板の製造方法を提供するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a speaker diaphragm in which a sheet mainly made of thermoplastic resin is heated and then pressed, so that the thickness of the diaphragm is uniform from the fixed part to the edge part of the coil bobbin of the diaphragm. A method of manufacturing a speaker diaphragm is provided.
本発明者らは、すでに熱可塑性樹脂に炭素繊維等の高弾
性率繊維を混抄した複合シートを、加熱した後、プレス
成形してコーン形状のスピーカ用振動板を製造する方法
を提案した。The present inventors have already proposed a method of manufacturing a cone-shaped speaker diaphragm by heating and press-molding a composite sheet made by mixing high elastic modulus fibers such as carbon fibers with a thermoplastic resin.
次にこの製造方法について第１図Ａ、Ｂとともに説明す
る。Next, this manufacturing method will be explained with reference to FIGS. 1A and 1B.
第１図において、１は熱可塑性樹脂を主体とするシート
であり、このシート１は高密度ポリエチレン繊維と炭素
繊維（１５ｗｔ％）とを混抄したものである。In FIG. 1, numeral 1 is a sheet mainly made of thermoplastic resin, and this sheet 1 is a mixture of high-density polyethylene fibers and carbon fibers (15 wt%).
このシート１をプレス成形の前工程で加熱し、この加熱
により軟化している状態でプレスしてコーン形状に成形
するものである。第１図Ａ、Ｂにおいて、２は凹金型で
あり、この凹金型２の上面には、傾斜凹面３と凹溝４と
が形成されている。５は凸金型であり、この凸金型５の
下面には傾斜凸面６と突起７が形成されている。This sheet 1 is heated in a pre-press molding process, and is pressed in a softened state by this heating to form a cone shape. In FIGS. 1A and 1B, 2 is a concave mold, and the upper surface of this concave mold 2 has an inclined concave surface 3 and a concave groove 4 formed therein. 5 is a convex mold, and the lower surface of this convex mold 5 has an inclined convex surface 6 and a protrusion 7 formed thereon.
加熱されて軟化したシート１を第１図Ａに示すように、
凸金型５と凹金型２との間に送給し、第１図Ｂに示すよ
うに、凸金型５を下降させ、この凸金型５と凹金型２と
の間でシート１をプレスし、コーン形状に成形するもの
である。この振動板の中央突出部は切り取られ、この部
分にコイルボビンが固定されるものである。しかしなが
ら、上記製造方法においては、第１図Ｂに示すように、
凸金型５を下降させていく場合に、この凸金型５の突起
Ｔがシート１に当接し、このシート１の中央部を下方に
押していく。As shown in FIG. 1A, the heated and softened sheet 1 is
The sheet 1 is fed between the convex mold 5 and the concave mold 2, and the convex mold 5 is lowered as shown in FIG. 1B. It is pressed and formed into a cone shape. A central protruding portion of this diaphragm is cut out, and a coil bobbin is fixed to this portion. However, in the above manufacturing method, as shown in FIG. 1B,
When the convex mold 5 is lowered, the projections T of the convex mold 5 come into contact with the sheet 1 and push the central part of the sheet 1 downward.
このため、このシート１の上記突起７に当接する部分は
凸金型が常温なため、急速に冷され、引き伸ばされるこ
となく当接する以前とほぼ同じ厚さに保たれるのに対し
、上記突起Ｔに当接する部分の外周部ａが引き伸ばされ
、この部分ａの厚さが薄くなつたままプレス成形される
ものである。第２図は従来の製造方法により製造した振
動板のコイルボビン取付部からの距離とその部分の重量
との関係を示しており、コイルボビン取付部と外周部と
で重量の差が大きく、均一の厚さに成形されていない。
本発明は上記従来の欠点を除去するものであり、以下に
本発明の一実施例について説明する。Therefore, since the convex mold is at room temperature, the part of this sheet 1 that comes into contact with the protrusion 7 is rapidly cooled down and remains almost the same thickness as before the contact without being stretched. The outer periphery a of the portion abutting the T is stretched, and press molding is performed with the thickness of this portion a reduced. Figure 2 shows the relationship between the distance from the coil bobbin mounting part of a diaphragm manufactured by the conventional manufacturing method and the weight of that part, and it shows that there is a large difference in weight between the coil bobbin mounting part and the outer periphery, and the thickness is uniform. It is not molded in any way.
The present invention eliminates the above-mentioned conventional drawbacks, and one embodiment of the present invention will be described below.
第３図は本発明の製造方法を実施する金型を示している
。本実施例は凸金型５の突起７の下面に渦巻バネ８を取
付けるとともに、この渦巻バネ８の下端にアルミニウム
箔からなる円板９を取付けたものである。上記渦巻バネ
８は第４図Ａにも示すように、突起７の径より小さい径
を有する径大部を突起７の下面に取付けた本のである。
第５図Ａ，Ｂはプレス工程を示しており、凸金型５を下
降させていくと、第５図Ａに示すように渦巻バネ８先端
の円板９がシート１に当接し、このシート１を押しなが
らさらに下降する。FIG. 3 shows a mold for carrying out the manufacturing method of the present invention. In this embodiment, a spiral spring 8 is attached to the lower surface of the protrusion 7 of the convex mold 5, and a disk 9 made of aluminum foil is attached to the lower end of the spiral spring 8. As shown in FIG. 4A, the spiral spring 8 is a type in which a large diameter portion having a smaller diameter than the projection 7 is attached to the lower surface of the projection 7.
5A and 5B show the pressing process, and as the convex mold 5 is lowered, the disk 9 at the tip of the spiral spring 8 comes into contact with the sheet 1, as shown in FIG. Press 1 and go down further.
この際シート１の円板９の当接部の外周部ｂが引き伸ば
される。凸金型５がさらに下降すると、第５図Ｂに示す
ように、シート１が凹金型２に接触するとともに、渦巻
バネ８が第４図Ｂに示すように圧縮され、シート１が凸
金型５と凹金型２とにより挟持され、コーン形状に成形
されるものであり、突起７がシート１に当接する部分は
かなり薄い部分を含んでいるが、コイル部分が取り付け
られる部分すなわち突起７がシート１に当接する部分の
外周部の膜厚は従来よりかなり厚いものとなる。また、
この突起７がシート１に当接する部分は切り取られるた
め、材料を有効に利用するという観点からできるだけ薄
い方が良い。また、切り取られる部分を広くとらねばな
らない振動板を成形するときはさらに有効に利用できる
。さらにコイルボビン取付部からエツジ部までの振動板
の厚さを均一とすることができる。上記のような渦巻バ
ネ８が取付けられた凸金型５を用いた場合には、シート
１の円板９との接触部の外周部が引き伸ばされ、コイル
ボビンが取付けられる部分が引き伸ばされないため、コ
イルボビンの取付部の厚さが薄くならない。At this time, the outer circumferential portion b of the contact portion of the disc 9 of the seat 1 is stretched. When the convex mold 5 further descends, the sheet 1 comes into contact with the concave mold 2 as shown in FIG. 5B, and the spiral spring 8 is compressed as shown in FIG. It is held between a mold 5 and a concave mold 2 and molded into a cone shape, and the part where the protrusion 7 contacts the sheet 1 includes a fairly thin part, but the part where the coil part is attached, that is, the protrusion 7 The film thickness at the outer periphery of the portion where it contacts the sheet 1 is considerably thicker than before. Also,
Since the portion where this protrusion 7 contacts the sheet 1 is cut off, it is better to make it as thin as possible from the viewpoint of effectively utilizing the material. Moreover, it can be used more effectively when molding a diaphragm that requires a wide cutout area. Furthermore, the thickness of the diaphragm from the coil bobbin mounting portion to the edge portion can be made uniform. When using the convex mold 5 to which the spiral spring 8 is attached as described above, the outer circumferential portion of the contact portion of the sheet 1 with the disk 9 is stretched, and the portion where the coil bobbin is attached is not stretched. The thickness of the coil bobbin attachment part does not become thinner.
第６図は本発明の製造方法により製造した振動板のコイ
ルボビン取付部からエツジ部までの重量分布を示してお
り、振動板の厚さが均一となるものである。FIG. 6 shows the weight distribution of the diaphragm manufactured by the manufacturing method of the present invention from the coil bobbin attachment part to the edge part, and the thickness of the diaphragm is uniform.
また本発明方法によれば、特にコイルボビン取付部の厚
さが薄くならないため、この振動板を用いたスピーカの
音圧周波数特性の高域が不安定になることはないもので
ある。第７図は本発明の他の実施例を示しており、本実
施例においては、コイルバネ１０を用い、このコイルバ
ネ１０を、凸金型５の突起７に形成した環状溝１１内に
取付け、先端部が突出するようにしたものである。Furthermore, according to the method of the present invention, the thickness of the coil bobbin mounting portion is not particularly reduced, so that the high range of the sound pressure frequency characteristics of a speaker using this diaphragm will not become unstable. FIG. 7 shows another embodiment of the present invention. In this embodiment, a coil spring 10 is used, and this coil spring 10 is installed in an annular groove 11 formed in a protrusion 7 of a convex mold 5. The part is made to protrude.
本発明の製造方法は上記のような構成であり、本発明に
よれば、シートを成形する際に、コイルボビン取付部が
引き伸ばされることがなく成形でき、本発明の製造方法
により製造した振動板を用いたスピーカでは、特に高域
の特性が安定する利点を有するものである。The manufacturing method of the present invention has the above configuration, and according to the present invention, when molding a seat, the coil bobbin attachment part can be molded without being stretched, and the diaphragm manufactured by the manufacturing method of the present invention can be molded. The speaker used has the advantage of having particularly stable high frequency characteristics.
なお、前記実施例では、渦巻バネ、コイルバネを用いて
いるが、これらの弾性体に限らず、圧縮可能で、シート
との当接面が、凸金型の突起の面積より小さい面積を有
する弾性体であればよいものである。Note that although spiral springs and coil springs are used in the above embodiments, these elastic bodies are not limited to elastic bodies that are compressible and whose contact surface with the sheet has an area smaller than the area of the protrusion of the convex mold. Any body is fine.
本発明は上記のような構成であり、本発明によれば、コ
イルボビンの取付部の厚さを薄くすることなく、振動板
形状に成形できるものであり、本発明の製造方法により
製造した振動板を用いたスピーカによれば、特に高域の
特性が安定する利点を有するものである。The present invention has the above-described configuration, and according to the present invention, the coil bobbin can be formed into a diaphragm shape without reducing the thickness of the attachment part, and the diaphragm manufactured by the manufacturing method of the present invention A speaker using the above has the advantage that the high frequency characteristics are particularly stable.
第１図Ａ，Ｂは従来のスピーカ用振動板の製造方法にお
けるプレス工程の動作説明図、第２図は従来の製造方法
により製造した振動板の重量分布を示す図、第３図は本
発明の製造方法におけるプレス金型の断面図、第４図Ａ
，Ｂは同プレス金型の要部拡大図、第５図Ａ，Ｂは同プ
レス金型によるプレス工程の動作説明図、第６図は本発
明の製造方法により製造した振動板の重量分布を示す図
、第７図は本発明の他の実施例におけるプレス金型の要
部拡大断面図である。
１・・・・・・シート、２・・・・・・凹金型、３・・
・・・・傾斜凹面、４・・・・・・凹溝、５・・・・・
・凸金型、６・・・・・・傾斜凸面、７・・・・・・突
起、８・・・・・・渦巻バネ、９・・・・・・円板、１
０・・・・・・コイルバネ、１１・・・・・・環状溝。Figures 1A and B are operation explanatory diagrams of the pressing process in the conventional method for manufacturing a diaphragm for speakers, Figure 2 is a diagram showing the weight distribution of the diaphragm manufactured by the conventional manufacturing method, and Figure 3 is an illustration of the present invention. Cross-sectional view of the press mold in the manufacturing method of FIG. 4A
, B are enlarged views of the main parts of the same press mold, Figures 5A and B are explanatory diagrams of the operation of the pressing process using the same press mold, and Figure 6 shows the weight distribution of the diaphragm manufactured by the manufacturing method of the present invention. The figure shown in FIG. 7 is an enlarged sectional view of a main part of a press die in another embodiment of the present invention. 1...Sheet, 2...Concave mold, 3...
... Slanted concave surface, 4 ... Concave groove, 5 ...
・Convex mold, 6... Inclined convex surface, 7... Protrusion, 8... Spiral spring, 9... Disc, 1
0... Coil spring, 11... Annular groove.
Claims (1)
せた後に、このシートを中央部に突起が形成された凸金
型と、上記突起が挿入する凹溝が形成された凹金型とで
プレスしてコーン形状に成形するスピーカ用振動板の製
造方法において、上記突起の下面に、圧縮可能で上記突
起の面積より小さな端面を有する弾性体を設けた凸金型
を用いることを特徴とするスピーカ用振動板の製造方法
。1. After heating and softening a sheet mainly made of thermoplastic resin, this sheet is put into a convex mold with a protrusion formed in the center and a concave mold with a concave groove into which the protrusion is inserted. A method of manufacturing a speaker diaphragm by pressing and forming it into a cone shape, characterized in that a convex mold is used in which a compressible elastic body is provided on the lower surface of the protrusion and has an end surface smaller than the area of the protrusion. A method for manufacturing a speaker diaphragm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3180280A JPS5927151B2 (en) | 1980-03-12 | 1980-03-12 | Manufacturing method of speaker diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3180280A JPS5927151B2 (en) | 1980-03-12 | 1980-03-12 | Manufacturing method of speaker diaphragm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56128094A JPS56128094A (en) | 1981-10-07 |
| JPS5927151B2 true JPS5927151B2 (en) | 1984-07-03 |
Family
ID=12341203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3180280A Expired JPS5927151B2 (en) | 1980-03-12 | 1980-03-12 | Manufacturing method of speaker diaphragm |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5927151B2 (en) |
-
1980
- 1980-03-12 JP JP3180280A patent/JPS5927151B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56128094A (en) | 1981-10-07 |
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