JP4019525B2 - Speaker diaphragm and speaker using the speaker diaphragm - Google Patents

Description

【００２２】
以上（表１）によると、Ａは防水試験も接合性も良好であったが、比較例Ｂはピンホールのために防水試験は不可であり、比較例Ｃは防水試験は良好であったが、接着強度（ガスケット等）は他のものより劣っていた。
【００２３】
次に耐熱性（１００℃１５０時間放置）、耐寒性（−４０℃１５０時間放置）、熱衝撃（−４０℃〜８５℃の各槽内に各１時間放置を２０サイクル）、耐湿性（５５℃９０％５００時間放置）の各試験をそれぞれ行い、各試験後上記防水試験を行った。結果を（表２）に示す。
【００２４】
【表２】

【００２５】
以上（表２）によるとＡは上記各試験後の防水試験においても水漏れは発生しなかった。比較例Ｂはいずれの試験後の防水試験においてもスピーカ用振動板から水漏れが発生した（６ナイロンフィルムに微小なピンホールがあるものと考えられる。）。比較例Ｃは耐熱、耐寒性の試験後の防水試験では水漏れは発生しなかったが、熱衝撃、耐湿性の試験後の防水試験ではゴムガスケットとスピーカ用振動板との間で水漏れが発生した（接合強度の劣化に起因するものと考えられる。）。
【００２６】
以上のように本実施の形態のスピーカ用振動板は防水性に優れたものであることが確認された。
【００２７】
なお、上記実施の形態では、防水性に優れたフィルム１６としてオレフィン系フィルムを用いたが、ポリエステル系フィルムを用いても同様の効果が確認された。
【００２８】
また、スピーカ用振動板１１の成形物９にアクリル系樹脂および／またはポリエステル系樹脂を０〜３０％含浸し、さらにフッ素系樹脂を０〜１０％含浸することによって、溶剤系のアクリル樹脂の含浸加工を施すことで耐湿性の向上を図り、更にフッ素系樹脂の含浸によって撥水性の向上を図り、更なる防水性能の向上を図ることも可能である。
【００２９】
【発明の効果】
以上のように本発明のスピーカ用振動板は、耐水性に優れた合成繊維と天然パルプ繊維とを混合抄紙して振動板形状に加熱加圧成形した成形物の表面に防水性と接合性に優れた二種類のフィルム構成からなる複合シートをラミネート加工して防水性の優れたものが得られるものである。
【図面の簡単な説明】
【図１】本発明のスピーカ用振動板の一実施の形態のものを用いたスピーカの側断面図
【図２】同スピーカ用振動板の一実施の形態の要部拡大断面図
【図３】同図１のスピーカを用いた防水試験の説明を行うための側断面図
【符号の説明】
３ 界磁部
８ フレーム
９ 成形物
１０ 複合シート
１１ スピーカ用振動板
１２ ダストキャップ
１３ ボイスコイル
１４ 磁気ギャップ
１６ フィルム
１７ フィルム
１８ ガスケット[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker using the speaker diaphragm AND ITS speaker diaphragm used for various acoustic devices.
[0002]
[Prior art]
Conventionally, waterproof speaker diaphragms mainly used in waterproof acoustic equipment are made of a mixture of synthetic and natural pulp fibers with excellent water resistance and heat-pressed into a diaphragm shape. In order to increase, those obtained by impregnating a solvent-based acrylic resin, polyester-based resin or the like, and those obtained by laminating a polyamide film or a polyethylene film single layer film on the surface have been used.
[0003]
[Problems to be solved by the invention]
In the above-mentioned speaker diaphragm, it is difficult to eliminate the pinholes in the former, and it is impossible as a completely waterproof speaker diaphragm. In the latter, the speaker vibration for waterproofing made of polyamide film is impossible. The plate has no problem in adhesiveness, but the polyamide film itself has a hygroscopic property, so that the physical properties of the speaker diaphragm are extremely deteriorated and the sound quality of the speaker is lowered.
[0004]
Note that the diaphragm for speakers laminated with an olefin film such as polyethylene film considering waterproofness is sufficiently waterproof, but the adhesiveness is poor, and the voice coil and dust cap joined to the diaphragm for speakers. However, there are many problems in bonding with other speaker components such as gaskets, and it was not satisfactory as a speaker diaphragm for waterproofing such as water leakage due to bonding loss.
[0005]
The present invention improves the above-mentioned conventional drawbacks and improves the problem of hygroscopicity such as polyamide-based films and jointability with other joining parts such as olefin-based films. A waterproof diaphragm for a speaker, a manufacturing method thereof, and a speaker using the speaker diaphragm are provided.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, a diaphragm for a speaker according to the present invention includes a composite sheet obtained by superimposing a film having excellent bonding properties on a film having excellent waterproof properties, and a synthetic fiber having excellent water resistance. and are those configured by laminate-processed into molded Butsujo which a natural pulp fibers mixed paper and by heat and pressure molded into the diaphragm shape, olefinic or polyester as a film excellent in water resistance of the composite sheet with the film, using a polyamide-based film as a film excellent in bonding property, it is excellent in water resistance, which speaker diaphragm excellent in bondability with other parts of the speaker, such as a gasket can be provided It is.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention is a composite sheet obtained by superimposing a film excellent in bondability on a film excellent in waterproofness, and synthetic fiber and natural pulp fiber excellent in water resistance. And a laminated sheet on a molded product that is heat-pressed into a diaphragm shape to form a diaphragm for a speaker, and an olefin-based or polyester-based film as a film excellent in waterproofness of the composite sheet. the reference, by using a polyamide film as a film excellent in bonding property, is excellent in water resistance, and serves as a diaphragm for superior speaker to bonding between other components of the speaker of the gaskets .
[0008]
According to the second aspect of the present invention, the molded article according to the first aspect is blended with 20% or more of polyethylene fiber and / or aromatic fiber as a synthetic fiber excellent in water resistance, and further natural pulp fiber. And then press-molded into a diaphragm shape, impregnated with 0-30% acrylic resin and / or polyester resin, and further impregnated with 0-10% fluorine resin, The speaker diaphragm is impregnated with a solvent-based acrylic resin to improve moisture resistance, and further impregnated with a fluorine-based resin to improve water repellency, thereby further improving waterproof performance.
[0011]
According to a third aspect of the present invention, there is provided a magnetic circuit unit, a frame coupled to the magnetic circuit unit, an outer periphery coupled to the frame via an edge, and an inner periphery coupled to the magnetic circuit unit. 4. The speaker diaphragm according to claim 1, wherein the speaker diaphragm is coupled to a voice coil fitted in a gap, and the speaker diaphragm is covered with an adhesive so as to cover the voice coil. It is composed of a waterproof dust cap that is joined together, and makes it possible to provide an extremely excellent waterproof speaker without water permeation from the speaker diaphragm side to the speaker's magnetic circuit. is there.
[0012]
Hereinafter, an embodiment of the speaker diaphragm of the present invention will be described with reference to FIGS.
[0013]
FIG. 1 is a half sectional view of a speaker using the speaker diaphragm according to the embodiment of the present invention, FIG. 2 is an enlarged sectional view of a principal part of the speaker diaphragm, and FIG. 3 is for explaining a waterproof test. FIG.
[0014]
According to the figure, reference numeral 3 denotes a field portion, which is configured by stacking and connecting a lower plate 5 having a center pole 4, a ring-shaped magnet 6, and a ring-shaped upper plate 7.
[0015]
A frame 8 is coupled to the upper surface of the field part 3, and a speaker diaphragm 11 is coupled to the periphery of the frame 8. A dust cap 12 formed with a polyester film is attached to the inner peripheral portion of the central portion of the speaker diaphragm 11 to provide waterproofness, and the lower side of the inner peripheral portion of the central portion of the speaker diaphragm 11 (the dust cap 12 A voice coil 13 is coupled to the lower surface of the magnetic coil 13. The voice coil 13 is supported by a damper 15 at an intermediate portion so that the voice coil 13 fits into a magnetic gap 14 formed in the field magnet portion 3 without being eccentric. Reference numeral 18 denotes a gasket for eliminating a gap between the speaker and the mounting housing, and a rubber gasket is used when waterproofness is required.
[0016]
Next, the speaker diaphragm 11 will be described in detail. The speaker diaphragm 11 is made by mixing a synthetic fiber and natural pulp fiber having excellent water resistance to produce a diaphragm-shaped article, and further heating and pressing. Forming a molded product 9 by molding, and further laminating a composite sheet 10 composed of two types of film structures, a film 16 having excellent waterproof properties on the surface and a film 17 having excellent bonding properties, on the molded product 9 In this case, an olefin film is used as the film 16 having excellent waterproof properties, and a polyamide film is used as the film 17 having excellent bonding properties.
[0017]
The speaker diaphragm 11 can be obtained by laminating the composite sheet 10 on the molded product 9. The laminating process conditions include mixing paper making and setting the molded product 9 heated and pressed in a mold, and then combining the composite sheet 10. Is heated at a temperature 40 degrees to 100 degrees higher than the softening temperature of the respective films 16 and 17 of the composite sheet 10, and is quickly set in the mold when the composite sheet 10 is sufficiently flexible. The composite sheet 10 is laminated by being decompressed by a vacuum pump through the molded product 9. The heating conditions are 140 degrees to 160 degrees, and the heating time is 15 seconds to 20 seconds.
[0018]
Next, the waterproof property will be described by comparison with a conventional one.
A is a speaker having a diameter of 12 cm using the speaker diaphragm 11 according to one embodiment of the present invention shown in FIG. 2, and the composite sheet 10 uses a 30-micron polyethylene film as the film 16 having excellent waterproof properties. The film 17 is formed of a 30 micron 6 nylon film.
[0019]
B is a comparative example, in which instead of the composite sheet 10, 6 nylon having a thickness of 100 microns is attached (the others are the same as A). C is also a comparative example, in which a polyethylene film having a thickness of 100 microns is attached in place of the composite sheet 10 (others are the same as A).
[0020]
The results of the waterproof test (at a water depth of 60 cm) are shown in (Table 1).
As shown in FIG. 3, in the waterproof test, a speaker is attached to a cylindrical jig 19 through a rubber gasket 18, and water is poured into the cylindrical jig 19 to a height of 60 cm. Is to observe. Accordingly, the dust cap 12 is adhered to the speaker diaphragm 11 with an adhesive without any gap, and the gasket 18 and the cylindrical jig 19 are attached so as not to have a gap.
[0021]
[Table 1]

[0022]
According to the above (Table 1), A was good in waterproof test and bondability, but Comparative Example B was not waterproof because of pinholes, and Comparative Example C was good in waterproof test. The adhesive strength (gasket etc.) was inferior to the others.
[0023]
Next, heat resistance (left at 100 ° C. for 150 hours), cold resistance (left at −40 ° C. for 150 hours), thermal shock (20 cycles for 1 hour in each tank at −40 ° C. to 85 ° C.), moisture resistance (55 Each test at 90 ° C. for 90 hours was conducted, and the waterproof test was conducted after each test. The results are shown in (Table 2).
[0024]
[Table 2]

[0025]
According to the above (Table 2), A did not leak even in the waterproof test after each of the above tests. In Comparative Example B, water leakage occurred from the diaphragm for the speaker in any of the waterproof tests after the tests (it is considered that there are minute pinholes in the 6 nylon film). In Comparative Example C, water leakage did not occur in the waterproof test after the heat and cold resistance tests, but water leakage occurred between the rubber gasket and the speaker diaphragm in the waterproof test after the thermal shock and moisture resistance tests. (It is thought to be caused by deterioration of the bonding strength.)
[0026]
As described above, it was confirmed that the speaker diaphragm of the present embodiment was excellent in waterproofness.
[0027]
In the above embodiment, an olefin-based film is used as the film 16 having excellent waterproofness, but the same effect was confirmed even when a polyester-based film was used.
[0028]
Moreover, the molded product 9 of the speaker diaphragm 11 is impregnated with a solvent-based acrylic resin by impregnating the acrylic resin and / or the polyester resin with 0 to 30% and further impregnating the fluorine resin with 0 to 10%. It is possible to improve the moisture resistance by processing, and further improve the water repellency by impregnating the fluorine-based resin, thereby further improving the waterproof performance.
[0029]
【The invention's effect】
As described above, the diaphragm for a speaker of the present invention has a waterproof and bonding property on the surface of a molded article obtained by mixing paper with a synthetic fiber excellent in water resistance and natural pulp fiber and heat-pressing it into a diaphragm shape. A composite sheet having two excellent film configurations can be laminated to obtain an excellent waterproof property.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a speaker using a speaker diaphragm according to an embodiment of the present invention. FIG. 2 is an enlarged sectional view of a main portion of the speaker diaphragm according to an embodiment. 1 is a side sectional view for explaining a waterproof test using the speaker of FIG.
3 Field portion 8 Frame 9 Molded product 10 Composite sheet 11 Diaphragm for speaker 12 Dust cap 13 Voice coil 14 Magnetic gap 16 Film 17 Film 18 Gasket

Claims (3)

A composite sheet made by superimposing a film with excellent bondability on a film with excellent waterproof properties, and synthetic paper and natural pulp fibers with excellent water resistance are made into a mixed paper and heated to a diaphragm shape. a speaker diaphragm configured by laminate-processed into molded Butsujo was pressure molded, using a film of olefin or polyester as a film excellent in water resistance of the composite sheet, as an excellent film bondability A speaker diaphragm using a polyamide film.   As a synthetic fiber excellent in water resistance, 20% or more of polyethylene fiber and / or aromatic fiber is blended, and further mixed with natural pulp fiber and subjected to heat and pressure molding into a diaphragm shape, acrylic resin and / or The speaker diaphragm according to claim 1, wherein a molded article formed by impregnating polyester resin with 0 to 30% and further impregnating fluorine resin with 0 to 10% is used.   A magnetic circuit unit, a frame coupled to the magnetic circuit unit, an outer periphery coupled to the frame via an edge, and an inner periphery coupled to a voice coil fitted in a magnetic gap of the magnetic circuit unit A speaker comprising: the speaker diaphragm according to claim 1; and a waterproof dust cap coupled to the speaker diaphragm with an adhesive so as to cover the voice coil.

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