JP2006042036A - Manufacturing method for vibration cone for speaker, vibration cone manufactured by the method, and speaker using the vibration cone - Google Patents

Manufacturing method for vibration cone for speaker, vibration cone manufactured by the method, and speaker using the vibration cone Download PDF

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JP2006042036A
JP2006042036A JP2004220488A JP2004220488A JP2006042036A JP 2006042036 A JP2006042036 A JP 2006042036A JP 2004220488 A JP2004220488 A JP 2004220488A JP 2004220488 A JP2004220488 A JP 2004220488A JP 2006042036 A JP2006042036 A JP 2006042036A
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voice coil
diaphragm
speaker
mold
resin
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Hirobumi Onohara
博文 小野原
Fumio Saito
文雄 齋藤
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Foster Electric Co Ltd
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Foster Electric Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a vibration cone by which there is no need to unify a vibration cone with a voice coil using an adhesive, and manufacturing is easy, and shape-holding performance is high because is performed using an upper mold and a lower mold, and a drive plane of the vibration cone can be increased and a thinner product can be manufactured by the adoption of a flat type for the voice coil, and to provide a vibration cone manufactured by the method and a speaker using the vibration cone. <P>SOLUTION: At least either of a pair of molding blocks composed of an upper mold 1B and a lower mold 1A is formed of a material into which ultraviolet rays and/or visible rays 7 penetrate. Then, a predetermined amount of resin 4 to be hardened by the ultraviolet rays and/or visible rays 7 is dropped and molding blocks are closed after a voice coil 2 is arranged at a predetermined position on the female mold 1A having a surface formed almost in a vibration cone shape. The ultraviolet rays and/or visible rays 7 are irradiated from the outside of a mold which is penetrated with the ultraviolet rays and/or visible rays 7, and the resin 4 is hardened to form a vibration cone 8. The voice coil 2 is arranged on the female mold 1A along the vibration cone shape to attain a thinner product. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明は、音響機器の一種であるスピーカの振動板の製造方法、これによって製造された振動板およびその振動板を用いたスピーカに関する。   The present invention relates to a method for manufacturing a speaker diaphragm, which is a kind of acoustic equipment, a diaphragm manufactured by the method, and a speaker using the diaphragm.

振動板素材としては、紙製や樹脂製のもの等種々のものが存在し、一般的に紙製のものが多く用いられているが、製造面、耐熱、耐湿性等の観点から後者の樹脂製のものも多く用いられている。   There are various types of diaphragm materials such as paper and resin, and paper is generally used, but the latter resin is used from the viewpoint of manufacturing, heat resistance, and moisture resistance. Many of them are also used.

従来、一般的な樹脂製の振動板は、ＰＩ，ＰＥＴ等のフィルムを加熱し、圧空成形や真空成形、射出成形により予め振動板を成形し、この振動板に別工程で円筒状のボイスコイルの外周に巻線を巻回してなるボイスコイルを接着していた。   Conventionally, a general resin diaphragm is manufactured by heating a film such as PI, PET, etc., and forming a diaphragm in advance by pressure forming, vacuum forming, or injection molding. A voice coil formed by winding a wire around the outer periphery of the wire was bonded.

また、特開平１１−１４６４８７に示すように、振動板に予め凹溝状のボイスコイル取付部やエッジ等が一体形成されたものがあり、その凹溝状のボイスコイル取付部に、ボイスコイルを落とし込み、その上に接着剤を流し込み取付けるようにしたものがある。   Further, as disclosed in JP-A-11-146487, there is a diaphragm in which a concave groove-shaped voice coil mounting portion, an edge, and the like are integrally formed in advance, and a voice coil is attached to the concave groove-shaped voice coil mounting portion. There is one that is dropped and adhesive is poured onto it.

このボイスコイルは円筒状をなし、径方向の寸法が小さく振動板との接触面積が小さく、よって振動板を駆動する面積が小さく分割振動が発生し易いため、歪の原因になっていた。   This voice coil has a cylindrical shape and has a small radial dimension and a small contact area with the diaphragm. Therefore, the area for driving the diaphragm is small and a split vibration is easily generated, which causes distortion.

また、ボイスコイルを接着する接着剤やボイスコイルボビンの質量が付加されるため、スピーカの性能を低下させていた。   Further, since the mass of the adhesive for bonding the voice coil and the voice coil bobbin is added, the performance of the speaker is lowered.

また、振動板とボイスコイルとを接着剤を介して一体化する工程を要し、製造が煩雑である。   Moreover, the process of integrating a diaphragm and a voice coil via an adhesive agent is required, and manufacturing is complicated.

また、能率を取るためにはある円筒状のボイスコイルの軸方向の長さ寸法を確保しなければならず、薄型スピーカには不向きであった。   Further, in order to obtain efficiency, the axial length of a certain cylindrical voice coil must be secured, which is not suitable for a thin speaker.

薄型対応として、特開２００１−２１１４９８に示すように、振動板の表面にボイスコイルをエッチングで配置した平板スピーカがあるが、コイルを形成するエッチング部が薄く、大入力を入力することができない。   As a thin type, there is a flat speaker in which a voice coil is disposed by etching on the surface of a diaphragm as disclosed in Japanese Patent Laid-Open No. 2001-212498. However, an etching portion that forms a coil is thin and a large input cannot be input.

ボイスコイルをエッチングした後に成形するので、ボイスコイルの形状のずれや、ボイスコイル断線などの問題がある、等の課題があった。   Since the voice coil is formed after being etched, there are problems such as a problem such as a deviation in the shape of the voice coil and disconnection of the voice coil.

本発明は光硬化性の樹脂を用いて振動板を成形し、成形時にボイスコイルを一体化することに特徴を有しているが、このような振動板として特開昭６１−２１６５９８が存在する。
特開平１１−１４６４８７ 特開２００１−２１１４９８ 特開昭６１−２１６５９８ The present invention is characterized in that a diaphragm is formed using a photo-curable resin, and a voice coil is integrated at the time of molding. JP-A-61-216598 exists as such a diaphragm. .
JP-A-11-146487 JP2001-21114A JP 61-216598

しかし、この特開昭６１−２１６５９８では、一つの型上にボイスコイルのような部材を配置し、光硬化性樹脂を型上に塗布し、それに光を照射して硬化させ振動板を成形するようにし、下型と上型との２つの型を用い樹脂を硬化させるものでないため、形状保持性が低い、という課題があった。   However, in Japanese Patent Application Laid-Open No. 61-216598, a member such as a voice coil is arranged on one mold, a photo-curing resin is applied on the mold, and light is irradiated and cured to form a diaphragm. Thus, since the resin is not cured using two molds of the lower mold and the upper mold, there is a problem that the shape retainability is low.

また、ボイスコイルも通常の円筒状のものを用いているため、振動板を駆動する面積が小さく、歪の原因になっていた。   In addition, since the voice coil is also an ordinary cylindrical one, the area for driving the diaphragm is small, which causes distortion.

また、振動板に軸方向に寸法を有する円筒状のボイスコイルを一体化する構造のため、薄型スピーカには不向きである、という課題があった。   In addition, there is a problem that it is not suitable for a thin speaker because of the structure in which a cylindrical voice coil having a dimension in the axial direction is integrated with the diaphragm.

この発明は上記のことに鑑み提案されたもので、その目的とするところは、振動板とボイスコイルとを接着剤を用いて一体化する必要がなく、製造が容易で、かつ下型、上型を用いて成形するため、形状保持性が高く、また、ボイスコイルは偏平状としたため、振動板の駆動面を増やすことができるとともに、薄型を図ることのできる、振動板の製造方法、それによって作成された振動板およびその振動板を備えたスピーカを提供することにある。   The present invention has been proposed in view of the above, and the object of the present invention is that it is not necessary to integrate the diaphragm and the voice coil by using an adhesive, which is easy to manufacture, and has a lower mold and an upper mold. Since the molding is performed using a mold, the shape retention is high, and the voice coil is flat, so that the driving surface of the diaphragm can be increased and the diaphragm can be thinned. And a speaker including the diaphragm.

請求項１記載の発明は、上型１Ｂ、下型１Ａよりなる一組の成形型の少なくともいずれか一方を紫外線及びまたは可視光線７が透過する材料にて形成し、かつ表面がほぼ振動板形状に形成された下型１Ａ上の所定の位置に径方向に巾を有する偏平状のボイスコイル２を配置した後、紫外線及びまたは可視光線７により硬化する樹脂４を所定量滴下して型閉じし、前記紫外線及びまたは可視光線７を透過する型の外側から前記紫外線及びまたは可視光線７を照射し前記樹脂４を硬化させて成形することを特徴とする。
請求項２記載の発明は、前記ボイスコイル２とともに前記下型１Ａ上の外周部にガスケット３を配置して振動板を成形することを特徴とする。
請求項３記載の発明は、請求項１または２記載において、前記ボイスコイル２の内外周部をテーパ状に形成したことを特徴とする。
請求項４記載の発明にかかる振動板は、請求項１、２または３記載の製造方法によって成形されたことを特徴とする。
請求項５記載の発明は、ヨーク９と、このヨーク９に設けられたマグネット１０と、このマグネット１０の上部に設けられたセンターポール１１と、このセンターポール１１と磁気ギャップ１３を介し対向して前記ヨーク９の上端部に設けられたポールピース１２とからなる磁気回路の組立体と、下型１Ａおよび上型１Ｂを介し紫外線及びまたは可視光線７により硬化する樹脂４成形時にボイスコイル２が一体化されてなる振動板８とを備え、この振動板８が前記組立体上に設けられ、かつ前記振動板８に一体化された前記ボイスコイル２が前記磁気ギャップ１３部分からその上方の位置に設けられ、かつ磁気ギャップ１３は前記ボイスコイル２の振動時にボイスコイル２が接触しないように後面側から前面側に向って内径が次第に大きく形成されたことを特徴とする。
請求項６記載の発明は、請求項５記載において、紫外線及びまたは可視光線７により硬化する樹脂成形時に前記ボイスコイル２とともにガスケット３も一体化され、このガスケット３が前記組立体のポールピース１２上端部に接着され、組立体に前記振動板８が設けられたことを特徴とする。
請求項７記載の発明は、前記ボイスコイル２の内外周部は前記磁気ギャップ１３に対応させ後面側から前面側に向って径が大きくなるようテーパ状に形成されたことを特徴とする。 According to the first aspect of the present invention, at least one of a set of molds including the upper mold 1B and the lower mold 1A is formed of a material that transmits ultraviolet rays and / or visible light 7, and the surface has a substantially diaphragm shape. After placing a flat voice coil 2 having a width in the radial direction at a predetermined position on the lower mold 1A formed on the substrate, a predetermined amount of resin 4 that is cured by ultraviolet rays and / or visible light 7 is dropped to close the mold. The resin 4 is cured by irradiating the ultraviolet light and / or visible light 7 from the outside of the mold that transmits the ultraviolet light and / or visible light 7.
The invention according to claim 2 is characterized in that the diaphragm is formed by disposing the gasket 3 on the outer periphery of the lower mold 1A together with the voice coil 2.
According to a third aspect of the present invention, in the first or second aspect, the inner and outer peripheral portions of the voice coil 2 are tapered.
A diaphragm according to a fourth aspect of the invention is characterized by being formed by the manufacturing method according to the first, second, or third aspect.
According to the fifth aspect of the present invention, the yoke 9, the magnet 10 provided on the yoke 9, the center pole 11 provided on the top of the magnet 10, and the center pole 11 are opposed to each other via the magnetic gap 13. An assembly of a magnetic circuit comprising a pole piece 12 provided at the upper end of the yoke 9 and a voice coil 2 are integrally formed at the time of molding a resin 4 that is cured by ultraviolet rays and / or visible rays 7 through the lower die 1A and the upper die 1B. The diaphragm 8 is provided on the assembly, and the voice coil 2 integrated with the diaphragm 8 is positioned above the magnetic gap 13 portion. The magnetic gap 13 is formed so that the inner diameter is gradually increased from the rear surface side to the front surface side so that the voice coil 2 does not contact when the voice coil 2 vibrates. And characterized in that it is.
The invention according to claim 6 is the invention according to claim 5, wherein the gasket 3 is also integrated with the voice coil 2 at the time of resin molding which is cured by ultraviolet rays and / or visible rays 7, and this gasket 3 is the upper end of the pole piece 12 of the assembly. The diaphragm 8 is provided on the assembly, and the diaphragm 8 is provided on the assembly.
The invention according to claim 7 is characterized in that the inner and outer peripheral portions of the voice coil 2 are tapered so as to correspond to the magnetic gap 13 and the diameter increases from the rear side toward the front side.

以上のように本発明によれば、光硬化性樹脂成形時に成形型内の所定位置に予めボイスコイル２を配し、一体成形により振動板８を成形するようにし、ボイスコイル２を偏平状としたため、振動板８を駆動する面積を増すことができる。   As described above, according to the present invention, the voice coil 2 is preliminarily disposed at a predetermined position in the mold when the photocurable resin is molded, and the diaphragm 8 is formed by integral molding. Therefore, the area for driving the diaphragm 8 can be increased.

ボイスコイルボビンが不要で、かつボイスコイル接着用の接着剤も不要のため、製造が容易で、しかも振動板が軽量となり、高効率の特性を得ることができる。   Since a voice coil bobbin is not required and an adhesive for bonding a voice coil is not required, manufacturing is easy and the diaphragm is light in weight, so that highly efficient characteristics can be obtained.

偏平状のボイスコイル２を振動板形状に沿わせて下型１Ａ上の所定の位置に配置し、樹脂４を滴下し、上型１Ａを被せ光を照射して樹脂４を硬化させボイスコイル付き振動板８を成形してしまうため、ストレスが無く形状保持性が高く歪の少ない振動板８を得ることができ、かつボイスコイル２は偏平状のため、スピーカの薄型化を図ることができる。   A flat voice coil 2 is placed at a predetermined position on the lower mold 1A along the diaphragm shape, the resin 4 is dropped, the upper mold 1A is covered and irradiated with light to cure the resin 4 and with a voice coil. Since the diaphragm 8 is molded, it is possible to obtain the diaphragm 8 with no stress, high shape retention and low distortion, and since the voice coil 2 is flat, the speaker can be thinned.

フィルムにボイスコイルをエッチングした後に成形するものに比べ、ボイスコイル２の形状のずれやコイル断線等がなく、かつエッチングしたものと比較し高入力を入れることができる。   Compared to what is formed after etching the voice coil on the film, there is no deviation in the shape of the voice coil 2, coil disconnection, etc., and a higher input can be applied compared to the etched one.

以下、図面に沿って本発明の実施例を説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１（１）〜（７）は振動板成形段階でボイスコイルが一体化される本発明の振動板の製造工程の説明図を示す。   1 (1) to 1 (7) are explanatory views of the manufacturing process of the diaphragm of the present invention in which the voice coil is integrated in the diaphragm forming stage.

図１（１）において１Ａは例えばアクリル樹脂のような、紫外線及びまたは可視光線が透過する材料からなる透明の下型であり、この下型１Ａの表面は成形する振動板形状にほぼ対応した形状になっている。すなわち、中央部は上方に向って弧状に突出した湾曲部１ａを有し、その外周部はやや凹状のボイスコイル配置部１ｂが形成されている。ボイスコイル配置部１ｂは成形される振動板形状に沿った形状をなし、径方向に所定の巾をなし、かつボイスコイル配置部１ｂの側壁部は落とし込まれるボイスコイルの形状に対応し、この例ではテーパ状に形成されている。なお、このボイスコイル配置部１ｂの深さは成形される振動板の形状に沿うようあまり深くなく、振動板およびこれと振動板成形時に一体化されるボイスコイル部の薄型化を図っている。そして、ボイスコイル配置部１ｂの外側はエッジを形成すべく断面逆Ｕ字状の突部１ｃが形成され、さらにその外側は断面矩形の凹状に形成されたガスケット配置部１ｄが形成されている。この凹状のガスケット配置部１ｄの底部はボイスコイル配置部１ｂの底部より下側に位置し、後述するヨークに取り付けられる。   In FIG. 1A, reference numeral 1A denotes a transparent lower mold made of a material that transmits ultraviolet light and / or visible light, such as acrylic resin. The surface of the lower mold 1A has a shape substantially corresponding to the shape of the diaphragm to be molded. It has become. That is, the central portion has a curved portion 1a that protrudes upward in an arc shape, and a slightly concave voice coil placement portion 1b is formed on the outer peripheral portion thereof. The voice coil placement portion 1b has a shape along the shape of the diaphragm to be molded, has a predetermined width in the radial direction, and the side wall portion of the voice coil placement portion 1b corresponds to the shape of the dropped voice coil. In the example, it is formed in a tapered shape. Note that the depth of the voice coil arrangement portion 1b is not so deep as to conform to the shape of the diaphragm to be molded, and the thickness of the diaphragm and the voice coil section integrated with the diaphragm is reduced. A protrusion 1c having an inverted U-shaped cross section is formed on the outer side of the voice coil arrangement portion 1b to form an edge, and a gasket arrangement portion 1d formed in a concave shape having a rectangular cross section is formed on the outer side. The bottom of the concave gasket placement portion 1d is located below the bottom of the voice coil placement portion 1b and is attached to a yoke described later.

図１（２）は、ボイスコイル配置部１ｂに、内、外周部がテーパ状をなすように予め巻線を必要数巻回して形成した径方向に巾を有し、軸方向の寸法を少とした、断面がほぼ逆台形をなす偏平状のボイスコイル２を落とし込んで配置した状態を示す。また、ガスケット配置部１ｄにはリング状のガスケット３が配置される。   FIG. 1 (2) shows that the voice coil placement portion 1b has a width in the radial direction formed by winding a necessary number of windings in advance so that the inner and outer peripheral portions are tapered, and the axial dimension is small. The state where the flat voice coil 2 having a substantially inverted trapezoidal section is dropped and arranged is shown. In addition, a ring-shaped gasket 3 is disposed in the gasket placement portion 1d.

その後、図１（３）に示すように、紫外線及びまたは可視光線により硬化する、未硬化状態の液状の樹脂４を原料タンク（図示せず）からのノズル５を介し湾曲部１ａ上に所定量滴下する。この樹脂４としては、例えばウレタンアクリレート樹脂を主成分とし、ベンゾインエーテル、ベンゾフェノンアミン類を光重合開始剤として配合した２０℃における粘度が２０，０００〔ｍＰａ・ｓ〕の紫外線及びまたは可視光線により硬化する樹脂を用いると好適である。   Thereafter, as shown in FIG. 1 (3), a predetermined amount of uncured liquid resin 4 which is cured by ultraviolet rays and / or visible rays is applied onto the curved portion 1a via a nozzle 5 from a raw material tank (not shown). Dripping. As this resin 4, for example, a urethane acrylate resin as a main component and a benzoin ether and a benzophenoneamine as a photopolymerization initiator are blended as a photopolymerization initiator. It is preferable to use a resin to be used.

次に、図１（４）、（５）に示すように、同じく透明であって表面が振動板形状に対応した形状をなす上型１Ｂを閉じる。   Next, as shown in FIGS. 1 (4) and (5), the upper mold 1B, which is also transparent and has a surface corresponding to the shape of the diaphragm, is closed.

この後、図１（６）に示すように、上型１Ｂの上方及び下型１Ａの下方にセットした例えば超高圧水銀ランプを光源とする照射装置６を介し光線を上型１Ｂ、下型１Ａを介し樹脂４に所定時間照射する。   Thereafter, as shown in FIG. 1 (6), the upper mold 1B and the lower mold 1A are irradiated with light through an irradiation device 6 using, for example, an ultra-high pressure mercury lamp set above the upper mold 1B and below the lower mold 1A. Then, the resin 4 is irradiated for a predetermined time.

このように、上下型１Ｂ、１Ａ双方を透明にし、かつ上下方向から光線７を照射すると、それだけ短時間で樹脂４を硬化させることができるが、例えば小径であって薄型の振動板の場合、上下型１Ｂ、１Ａのいずれか一方のみを透明とし、かつ設備の増大を防止すべく照射装置を透明の型側のみに配置した構成としても良い。   Thus, if both the upper and lower molds 1B and 1A are made transparent and the light beam 7 is irradiated from the upper and lower directions, the resin 4 can be cured in such a short time. For example, in the case of a thin diaphragm having a small diameter, Only one of the upper and lower molds 1B and 1A may be transparent, and the irradiation device may be arranged only on the transparent mold side to prevent an increase in equipment.

樹脂４が硬化したら上下の型１Ｂ、１Ａを開き、ボイスコイル２、ガスケット３等が一体化された振動板８を取り出せば良い。図１（７）は上下型１Ｂ、１Ａから取り出された樹脂４からなる振動板８を示す。   When the resin 4 is cured, the upper and lower molds 1B and 1A are opened, and the diaphragm 8 in which the voice coil 2, the gasket 3 and the like are integrated is taken out. FIG. 1 (7) shows the diaphragm 8 made of the resin 4 taken out from the upper and lower molds 1B and 1A.

図２は上記振動板８を組み込んだスピーカの一実施例を示す。   FIG. 2 shows an embodiment of a speaker in which the diaphragm 8 is incorporated.

図中９は断面ほぼＵ字状をなすヨークであり、このヨーク９内のほぼ中央部にはマグネット１０が設けられ、内磁型の磁気回路となっている。１１はマグネット１０の上部に設けられたセンターポール、１２はヨーク９の上端部に設けられたポールピース、１３は磁気ギャップである。ポースピース１２の外周部上にガスケット３が取り付けられ、磁気回路の組立体上に振動板８が設けられ、振動板８に一体化されたボイスコイル２は磁気ギャップ１３部分に配置されている。   In the figure, reference numeral 9 denotes a yoke having a substantially U-shaped cross section, and a magnet 10 is provided at substantially the center of the yoke 9 to form an internal magnet type magnetic circuit. 11 is a center pole provided at the upper part of the magnet 10, 12 is a pole piece provided at the upper end of the yoke 9, and 13 is a magnetic gap. The gasket 3 is attached on the outer periphery of the piece 12, the diaphragm 8 is provided on the magnetic circuit assembly, and the voice coil 2 integrated with the diaphragm 8 is disposed in the magnetic gap 13 portion.

図３は磁気ギャップ１３およびボイスコイル２部分の拡大図を示す。   FIG. 3 shows an enlarged view of the magnetic gap 13 and the voice coil 2 portion.

センターポール１１の外周部は後面側から前面側に向かって径が縮小するようにテーパ状に形成されている。また、これと離間して対向配置されたポールピース１２の内周面も同様にテーパ状に形成されている。換言すると、磁気ギャップ１３は後面側から前面側に向かって内径が大となり、その磁気ギャップ１３に、内外周の形状が後面側から前面側に向かって外側に広がるようにテーパ状に形成された偏平状のボイスコイル２が設けられている。   The outer peripheral portion of the center pole 11 is formed in a tapered shape so that the diameter decreases from the rear surface side toward the front surface side. Further, the inner peripheral surface of the pole piece 12 that is spaced from and opposed to the pole piece 12 is similarly tapered. In other words, the magnetic gap 13 has an inner diameter that increases from the rear surface side to the front surface side, and the magnetic gap 13 is formed in a tapered shape so that the inner and outer peripheral shapes spread outward from the rear surface side to the front surface side. A flat voice coil 2 is provided.

磁気ギャップ１３をテーパ状にしたのは、ボイスコイル２の位置が磁気ギャップ１３部分から上方にかけて配置されるため、磁束が、仮想線で示すように、ボイスコイル２に向って上方に流れるようにしたためである。   The reason why the magnetic gap 13 is tapered is that the position of the voice coil 2 is arranged upward from the magnetic gap 13 portion, so that the magnetic flux flows upward toward the voice coil 2 as indicated by a virtual line. This is because.

また、ボイスコイル２が振動した際、センターポール１１やポールピース１２に当たらないようにしたためである。   This is because when the voice coil 2 vibrates, it does not hit the center pole 11 or the pole piece 12.

ボイスコイル２の形状をテーパ状にしたのも同様の理由に基づく。   The reason why the shape of the voice coil 2 is tapered is based on the same reason.

図４は本発明の周波数特性を示す。本発明の振動板８はボビンレスで、かつ接着剤を不要としたため、軽量であるので、高効率の特性を得ることができる。また、ボイスコイル２の断面はほぼ逆台形とし、ボイスコイル２と振動板８との接触面積を広く確保でき、駆動面積を増やすことができ、分割振動が抑えられ、歪の発生を抑えることができる。   FIG. 4 shows the frequency characteristics of the present invention. Since the diaphragm 8 of the present invention is bobbin-free and does not require an adhesive, it is lightweight, so that highly efficient characteristics can be obtained. Further, the voice coil 2 has a substantially inverted trapezoidal cross section so that a large contact area between the voice coil 2 and the diaphragm 8 can be secured, the drive area can be increased, divided vibrations can be suppressed, and distortion can be suppressed. it can.

図５は本発明の第２実施例を示す。この例ではボイスコイル２Ａの形状はテーパ状でなく、通常のように円筒状に形成した例である。   FIG. 5 shows a second embodiment of the present invention. In this example, the shape of the voice coil 2A is not a taper, but is a cylindrical shape as usual.

ボイスコイル２Ａは振動した際に、センターポール１１やポールピース１２に当たらなければこのような形状としても良い。   The voice coil 2A may have such a shape if it does not hit the center pole 11 or the pole piece 12 when it vibrates.

（１）〜（７）は本発明の振動板の製造工程を示す説明図である。(1)-(7) is explanatory drawing which shows the manufacturing process of the diaphragm of this invention. 本発明のスピーカの一実施例の断面説明図を示す。The cross-sectional explanatory drawing of one Example of the speaker of this invention is shown. 本発明の要部拡大説明図を示す。The principal part expansion explanatory drawing of this invention is shown. 本発明の周波数特性を示す。The frequency characteristic of this invention is shown. 本発明のスピーカの他の実施例の断面説明図を示す。Sectional explanatory drawing of the other Example of the speaker of this invention is shown.

符号の説明Explanation of symbols

１Ａ 下型
１Ｂ 上型
１ａ 湾曲部
１ｂ ボイスコイル配置部
１ｃ 突部
１ｄ ガスケット配置部
２、２Ａ ボイスコイル
３ ガスケット
４ 樹脂
５ ノズル
６ 照射装置
７ 光線
８ 振動板
９ ヨーク
１０ マグネット
１１ センターポール
１２ ポールピース
１３ 磁気ギャップ
１４ 磁束 1A Lower mold 1B Upper mold 1a Curved part 1b Voice coil arrangement part 1c Projection part 1d Gasket arrangement part 2, 2A Voice coil 3 Gasket 4 Resin 5 Nozzle 6 Irradiation device 7 Light beam 8 Diaphragm 9 Yoke 10 Magnet 11 Center pole 12 Pole piece 13 Magnetic gap 14 Magnetic flux

Claims (7)

上型（１Ｂ）、下型（１Ａ）よりなる一組の成形型の少なくともいずれか一方を紫外線及びまたは可視光線（７）が透過する材料にて形成し、かつ表面がほぼ振動板形状に形成された下型（１Ａ）上の所定の位置に径方向に巾を有する偏平状のボイスコイル（２）を配置した後、紫外線及びまたは可視光線（７）により硬化する樹脂（４）を所定量滴下して型閉じし、前記紫外線及びまたは可視光線（７）を透過する型の外側から前記紫外線及びまたは可視光線（７）を照射し前記樹脂（４）を硬化させて成形することを特徴とするスピーカ用振動板の製造方法。   At least one of a set of molds composed of an upper mold (1B) and a lower mold (1A) is formed of a material that transmits ultraviolet light and / or visible light (7), and the surface is formed in a substantially diaphragm shape. After placing a flat voice coil (2) having a width in the radial direction at a predetermined position on the lower mold (1A), a predetermined amount of resin (4) that is cured by ultraviolet rays and / or visible rays (7) The mold is dropped and closed, and the resin (4) is cured by irradiating the ultraviolet and / or visible light (7) from the outside of the mold that transmits the ultraviolet and / or visible light (7). A method for manufacturing a speaker diaphragm. 前記ボイスコイル（２）とともに前記下型（１Ａ）上の外周部にガスケット（３）を配置して振動板を成形することを特徴とする請求項１記載のスピーカ用振動板の製造方法。   The method for manufacturing a diaphragm for a speaker according to claim 1, wherein the diaphragm is formed by arranging a gasket (3) on the outer periphery of the lower mold (1A) together with the voice coil (2). 前記ボイスコイル（２）の内外周部をテーパ状に形成したことを特徴とする請求項１または２記載のスピーカ用振動板の製造方法。   The method for manufacturing a speaker diaphragm according to claim 1 or 2, wherein the inner and outer peripheral portions of the voice coil (2) are tapered. 請求項１、２または３記載の製造方法によって成形されたことを特徴とするスピーカ用振動板。   A speaker diaphragm formed by the manufacturing method according to claim 1, 2 or 3. ヨーク（９）と、このヨーク（９）に設けられたマグネット（１０）と、このマグネット（１０）の上部に設けられたセンターポール（１１）と、このセンターポール（１１）と磁気ギャップ（１３）を介し対向して前記ヨーク（９）の上端部に設けられたポールピース（１２）とからなる磁気回路の組立体と、
下型（１Ａ）および上型（１Ｂ）を介し紫外線及びまたは可視光線（７）により硬化する樹脂（４）成形時にボイスコイル（２）が一体化されてなる振動板（８）とを備え、
この振動板（８）が前記組立体上に設けられ、かつ前記振動板（８）に一体化された前記ボイスコイル（２）が前記磁気ギャップ（１３）部分からその上方の位置に設けられ、かつ磁気ギャップ（１３）は前記ボイスコイル（２）の振動時にボイスコイル（２）が接触しないように後面側から前面側に向って内径が次第に大きく形成されたことを特徴とするスピーカ。 A yoke (9), a magnet (10) provided on the yoke (9), a center pole (11) provided on the top of the magnet (10), and a magnetic gap (13 ) And a pole piece (12) provided at the upper end of the yoke (9) opposite to each other,
A resin (4) that is cured by ultraviolet rays and / or visible rays (7) through the lower die (1A) and the upper die (1B), and a diaphragm (8) in which the voice coil (2) is integrated during molding,
The diaphragm (8) is provided on the assembly, and the voice coil (2) integrated with the diaphragm (8) is provided at a position above the magnetic gap (13), The speaker is characterized in that the magnetic gap (13) has an inner diameter that gradually increases from the rear side to the front side so that the voice coil (2) does not come into contact with the voice coil (2) when it vibrates. 紫外線及びまたは可視光線（７）により硬化する樹脂成形時に前記ボイスコイル（２）とともにガスケット（３）も一体化され、このガスケット（３）が前記組立体のポールピース（１２）上端部に接着され、組立体に前記振動板（８）が設けられたことを特徴とする請求項５記載のスピーカ。   The gasket (3) is also integrated with the voice coil (2) during resin molding that is cured by ultraviolet rays and / or visible light (7), and the gasket (3) is bonded to the upper end of the pole piece (12) of the assembly. 6. The loudspeaker according to claim 5, wherein the diaphragm is provided in an assembly. 前記ボイスコイル（２）の内外周部は前記磁気ギャップ（１３）に対応させ後面側から前面側に向って径が大きくなるようテーパ状に形成されたことを特徴とする請求項５記載のスピーカ。   The speaker according to claim 5, wherein the inner and outer peripheral portions of the voice coil (2) are formed in a tapered shape so as to correspond to the magnetic gap (13) so that the diameter increases from the rear side toward the front side. .
JP2004220488A 2004-07-28 2004-07-28 Manufacturing method for vibration cone for speaker, vibration cone manufactured by the method, and speaker using the vibration cone Pending JP2006042036A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009153002A (en) * 2007-12-21 2009-07-09 Casio Hitachi Mobile Communications Co Ltd Waterproofing acoustic structure and electronic device
GB2563982A (en) * 2017-05-11 2019-01-02 Premium Loudspeakers Hui Zhou Co Ltd Planar magnetic film speaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009153002A (en) * 2007-12-21 2009-07-09 Casio Hitachi Mobile Communications Co Ltd Waterproofing acoustic structure and electronic device
GB2563982A (en) * 2017-05-11 2019-01-02 Premium Loudspeakers Hui Zhou Co Ltd Planar magnetic film speaker
GB2563982B (en) * 2017-05-11 2020-06-17 Tymphany Acoustic Tech Huizhou Co Ltd Planar magnetic film speaker

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