JPH0115200B2 - - Google Patents
Info
- Publication number
- JPH0115200B2 JPH0115200B2 JP3773082A JP3773082A JPH0115200B2 JP H0115200 B2 JPH0115200 B2 JP H0115200B2 JP 3773082 A JP3773082 A JP 3773082A JP 3773082 A JP3773082 A JP 3773082A JP H0115200 B2 JPH0115200 B2 JP H0115200B2
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- adhesive
- speaker
- core material
- modified
- 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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Description
本発明は心材の表面に接着剤にて表面材を接合
してなるスピーカ用振動板に関するものであり、
その目的とするところは変成エーテル型ポリエス
テルコポリマーよりなる接着剤を用いることによ
り、剥離強度および衝撃強度が大きく、かつＱの
小さいスピーカ用振動板を提供することにある。
一般に、板状のスピーカ用振動板は心材の両面
に接着剤にて表面材を接合したものであり、その
接着剤としてエポキシ系接着剤を用いていた。し
かしながら、エポキシ系接着剤は平板振動板の接
着剤として用いた場合、振動板の駆動時に発生す
る応力のために表面材と心材との間に剥離が生
じ、振動板が破壊する恐れがあつた。また、振動
板にインパルス入力があつた場合、エポキシ系接
着剤は衝撃強度が低いために破壊する恐れがあつ
た。また、エポキシ系接着剤は材料自体の内部損
失（tanδ）が小さいためこれを用いて振動板を作
製した場合Ｑが大きくなり、最高共振周波数にお
いてピークを生じ、スピーカシステムの設計時に
クロスオーバーがしにくくなるという欠点があつ
た。
本発明は上記した従来の欠点を解消するもの
で、表面材と心材との接着剤として、ポリエチレ
ンテレフタレート形成性分と変性アルキレンエー
テル・テレフタレート組成とを反応させた弾性を
有する変性エーテル型ポリエステルブロツクコポ
リマーを使用したものである。この変性エーテル
型ポリエステルブロツクコポリーよりなる接着剤
は、下記のような基幹構造をもつている。
この接着剤はエチレンテレフタレート組成によ
る結晶質部分と変成アルキレンエーテル・テレフ
タレート組成による非晶質部分をもつている。そ
して、エチレンテレフタレート組成による結晶質
部分により、大きな剛性を有しており、外部より
の大きな応力に耐えることができる。また、変成
アルキレンエーテル・テレフタレート組成による
非晶質部分のために外部よりの振動による応力や
インパルス入力による衝撃に耐えることができ
る。また、非晶性部分による内部損失により、こ
れを用いたスピーカ用振動板のＱを低く抑えるこ
とができる。
以下、本発明のスピーカ用振動板について実施
例をもとに詳細に説明する。
（実施例）
接着剤に下記に示す構造を持ち、ｍ：ｎ＝１：
１
表面材は厚さ40μｍのアルミニウム（3S材）箔
を用い、心材は厚さ20μｍのアルミニウム（3S
材）箔よりなるハニカムコア（セル径５mm）を用
い、上述した接着剤を用いて170℃、２分５Kg／
cm2の条件で接着し、90℃での剥離試験に供した。
この結果を下表に示した。この90℃での剥離試験
結果によると、本実施例の場合の方がエポキシ接
着剤（エピコートＲ○828、DDM系）を用いた場
合よりも大きかつた。これは、接着剤の変成アル
キレンエーテル・テレフタレート組成の粘性部分
による強さが作用したものと考えられる。
The present invention relates to a speaker diaphragm formed by bonding a surface material to the surface of a core material with an adhesive,
The purpose is to provide a speaker diaphragm with high peel strength and impact strength and low Q by using an adhesive made of a modified ether type polyester copolymer. Generally, a plate-shaped speaker diaphragm has a core material and a surface material bonded to both sides with an adhesive, and an epoxy adhesive is used as the adhesive. However, when epoxy adhesives are used as adhesives for flat diaphragms, there is a risk of peeling between the surface material and the core material due to the stress generated when the diaphragm is driven, causing the diaphragm to break. . Furthermore, when an impulse input is applied to the diaphragm, there is a risk that the epoxy adhesive will break due to its low impact strength. In addition, since the internal loss (tanδ) of the material itself is small for epoxy adhesives, if a diaphragm is made using this adhesive, Q will be large and a peak will occur at the highest resonant frequency, causing crossover problems when designing a speaker system. The drawback was that it became difficult to use. The present invention solves the above-mentioned conventional drawbacks, and is an elastic modified ether type polyester block copolymer made by reacting a polyethylene terephthalate-forming component with a modified alkylene ether terephthalate composition as an adhesive between a surface material and a core material. This is what was used. The adhesive made of this modified ether type polyester block copoly has the following basic structure. This adhesive has a crystalline portion with an ethylene terephthalate composition and an amorphous portion with a modified alkylene ether terephthalate composition. Furthermore, due to the crystalline portion composed of ethylene terephthalate, it has great rigidity and can withstand large stress from the outside. Furthermore, because of the amorphous portion due to the modified alkylene ether terephthalate composition, it can withstand stress caused by external vibrations and shocks caused by impulse input. Further, due to the internal loss caused by the amorphous portion, the Q of a speaker diaphragm using this can be kept low. Hereinafter, the speaker diaphragm of the present invention will be described in detail based on examples. (Example) The adhesive has the structure shown below, m:n=1:
1 The surface material is aluminum (3S material) foil with a thickness of 40 μm, and the core material is aluminum (3S material) with a thickness of 20 μm.
Material) Using a honeycomb core made of foil (cell diameter 5 mm), using the above adhesive at 170°C for 2 minutes 5 kg /
cm 2 and subjected to a peel test at 90°C.
The results are shown in the table below. According to the results of this peel test at 90°C, the peeling strength in the case of this example was greater than that in the case of using the epoxy adhesive (Epicoat R○828, DDM system). This is thought to be due to the strength of the viscous portion of the modified alkylene ether terephthalate composition of the adhesive.
【表】
また、上述した接着剤を用いて平板振動板を作
製し、音響測定を行なつた。この時、振動板の外
径191mm、振動板高さ６mm、振動板重量14ｇとし
た。また、表面材は厚み40μｍのアルミニウム
箔、心材は厚み20μｍのアルミニウムハニカムコ
ア材、接着剤は40μｍのものを用いた。この結果
を図に示した。この結果では、本実施例の振動板
は高域共振周波数のＱがエポキシ接着剤を用いた
振動板にくらべ約8dB低かつた。また、耐入力試
験（DiN100W入力）の結果では、エポキシ接着
剤は約300時間よりスピーカの歪率が増大し、約
350時間後に振動板が破壊したが、本実施例の振
動板はほとんど歪率が増大せず、約500時間経過
しても破壊しなかつた。尚、第１図中、ａは本実
施例の振動板の音圧周波数特性、ｂは従来の振動
板の音圧周波数特性を示している。
以上、詳述したように本発明によれば、変性エ
ーテル型ポリエステルブロツクコポリマーよりな
る接着剤で心材の表面に表面材を接合したので、
剥離強度および衝撃強度が大きく、かつＱの小さ
いスピーカ用振動板を得ることができ、もつて最
高共振周波数におけるピークが抑えられてスピー
カシステムの設計を行ないやすくすることができ
る利点を有するものである。[Table] In addition, a flat diaphragm was fabricated using the adhesive described above, and acoustic measurements were performed. At this time, the outer diameter of the diaphragm was 191 mm, the diaphragm height was 6 mm, and the diaphragm weight was 14 g. Further, the surface material used was aluminum foil with a thickness of 40 μm, the core material used was an aluminum honeycomb core material with a thickness of 20 μm, and the adhesive used was 40 μm thick. The results are shown in the figure. The results show that the Q of the high resonance frequency of the diaphragm of this example was approximately 8 dB lower than that of the diaphragm using epoxy adhesive. In addition, the results of the input resistance test (DiN100W input) showed that the distortion rate of the speaker increased after about 300 hours with epoxy adhesive, and the distortion rate of the speaker increased after about 300 hours.
Although the diaphragm broke after 350 hours, the diaphragm of this example showed almost no increase in strain rate and did not break even after about 500 hours. In FIG. 1, a indicates the sound pressure frequency characteristic of the diaphragm of this embodiment, and b indicates the sound pressure frequency characteristic of the conventional diaphragm. As detailed above, according to the present invention, since the surface material is bonded to the surface of the core material with an adhesive made of a modified ether type polyester block copolymer,
It is possible to obtain a speaker diaphragm that has high peel strength and impact strength and has a small Q, and has the advantage that the peak at the highest resonance frequency can be suppressed, making it easier to design a speaker system. .
図は本発明のスピーカ用振動板と従来の振動板
の音圧周波数特性の比較曲線図である。
The figure is a comparison curve diagram of the sound pressure frequency characteristics of the speaker diaphragm of the present invention and a conventional diaphragm.
Claims (1)
アルキレンエーテル・テレフタレート組成とを反
応させた弾性を有する変性エーテル型ポリエステ
ルブロツクコポリマーよりなる接着剤により、表
面材と心材とを接合してなるスピーカ用振動板。1. A speaker diaphragm made by bonding a surface material and a core material with an adhesive made of an elastic modified ether-type polyester block copolymer obtained by reacting a polyethylene terephthalate-forming component with a modified alkylene ether terephthalate composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57037730A JPS58154997A (en) | 1982-03-09 | 1982-03-09 | Diaphragm for speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57037730A JPS58154997A (en) | 1982-03-09 | 1982-03-09 | Diaphragm for speaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58154997A JPS58154997A (en) | 1983-09-14 |
| JPH0115200B2 true JPH0115200B2 (en) | 1989-03-16 |
Family
ID=12505603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57037730A Granted JPS58154997A (en) | 1982-03-09 | 1982-03-09 | Diaphragm for speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58154997A (en) |
-
1982
- 1982-03-09 JP JP57037730A patent/JPS58154997A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58154997A (en) | 1983-09-14 |
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