JP3561954B2 - Diaphragm for dynamic microphone - Google Patents

Diaphragm for dynamic microphone Download PDF

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Publication number
JP3561954B2
JP3561954B2 JP15354894A JP15354894A JP3561954B2 JP 3561954 B2 JP3561954 B2 JP 3561954B2 JP 15354894 A JP15354894 A JP 15354894A JP 15354894 A JP15354894 A JP 15354894A JP 3561954 B2 JP3561954 B2 JP 3561954B2
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JP
Japan
Prior art keywords
diaphragm
reinforcing portion
adhesive
double
molding
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 - Fee Related
Application number
JP15354894A
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Japanese (ja)
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JPH0823596A (en
Inventor
正義 北條
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Panasonic Holdings Corp
Original Assignee
Panasonic Corp
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Panasonic Corp, Matsushita Electric Industrial Co Ltd filed Critical Panasonic Corp
Priority to JP15354894A priority Critical patent/JP3561954B2/en
Publication of JPH0823596A publication Critical patent/JPH0823596A/en
Application granted granted Critical
Publication of JP3561954B2 publication Critical patent/JP3561954B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Laminated Bodies (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Description

【０００１】
【産業上の利用分野】
この発明は、ボーカル及び拡声を主用途とするダイナミックマイクロホン用振動板に関する。
【０００２】
【従来の技術】
従来のこの種装置は、例えば図５及び図６に示すものがある。すなわち、図５において、振動板７の一部に熱硬化性エポキシ接着剤を塗布して補強部８を形成している。振動板７は、ポリエチレンフィルムから成り、その中央部分に熱硬化性エポキシ樹脂を塗布し、硬化反応が始まるまでの４〜５時間常温内に放置し、その後振動板成形金型（不図示）に挿入し、加熱並びに加圧成形することにより、熱硬化性エポキシ樹脂を完全硬化させると共に振動板７を所定の形状に成形して製作する。
【０００３】
また、図６に示すものは、ポリエチレンフィルムを成形してなる振動板９の中央部分に、接着剤１１を用いて同じくポリエチレンフィルムを貼付して補強部１０を形成するものである。そして、接着剤１１は、補強部１０の外周部及び中央部に対応して位置させて、補強部１０を振動板９に固定している。接着剤１１の硬化反応については、図５で示すものと同様である。
【０００４】
【発明が解決しようとする課題】
しかしながら、このような従来のダイナミックマイクロホン用振動板７，９は、補強部８を形成し或いは接着剤１１を構成する熱硬化性エポキシ接着剤の硬化反応が開始されるまでの放置時間を必要とし、熱硬化性エポキシ接着剤の振動板７への塗布から型成形までの間製作作業が中断し、製作工程における時間ロスを生むこととなり、振動板製作方法としては甚だ能率が悪い方法であるといわざるを得ない。
【０００５】
また、図６に示すものは、振動板９に接着剤１１を用いて補強部１０を貼着するため、振動板９と補強部１０との密着性確保が困難であることから、振動板９と補強部１０との間に気泡が残存することが考えられ、これによって高音領域における振動板９の分割振動による歪むを低減させるという効果を減ずるということも考えられる。
【０００６】
そこで、本発明は、高温領域における振動板による歪みを効果的に低減する補強措置を施したダイナミックマイクロホン用振動板を提供すると共に、接着剤塗布を要することなくボイスコイルと振動板との接合を実現させたダイナミックマイクロホン用振動板を提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明のダイナミックマイクロホン用振動板は、第１に、ポリエチレンフィルムからなる振動板基材の一部に、両面粘着テープによりポリエチレンフィルムを貼付して補強部を形成して構成している。
【０００８】
【作用】
本発明によれば、振動板基材と補強部とを、加熱成形可能な合成ゴム系又はアクリル系の接着剤からなる両面粘着テープを用いて貼付するか、また加熱成形可能な合成ゴム系又はアクリル系の接着剤からなる両面粘着テープ自身で補強部を形成するようにしたため、従来のように熱硬化性エポキシ接着剤の硬化反応が開始されるまでの放置時間を必要とせず、熱硬化性エポキシ接着剤の振動板への塗布から型成形までの間製作作業を中断させることなく、製作工程時間を短縮することができる。また、両面粘着テープを用いることにより、振動板と補強部との密着性が確保でき、振動板と補強部との間に気泡が残存せず、これによって高音領域における振動板の分割振動による歪むを低減させることができる。
【０００９】
また、両面粘着テープの接着剤として、振動板の成形温度範囲内では硬化せず粘着性を維持する接着剤を使用することにより、接着剤なくしてボイスコイルを振動板に接合することができる。
【００１０】
【実施例】
次に、図１及び図２は、本発明の第１の実施例を示すもので、図１は成形前の振動板を示す斜視図、図２は、成形後の振動板の縦断面図である。
【００１１】
図１及び図２において、１はポリエチレンフィルムからなる振動板基材、２は加熱成形可能な合成ゴム系またはアクリル系接着剤からなる両面粘着テープ、３は両面粘着テープ２より、振動板基材１の一部（中央部）に貼着されたポリエチレンフィルムからなる補強部である。そして、両面粘着テープ２と補強部３とは両素材を予め貼着して所定の大きさに打ち抜き形成されており、この状態で振動板基材１の所定部位に貼着され、図１に示すように平板状態にしておき、振動板成形金型内に挿入し、加熱成形することにより、補強部３を形成するポリエチレンフィルムを振動板基材１に貼着して一体化し、かつ図２に示すような波型に成形して、振動板４を成形するのである。
【００１２】
したがって、この振動板４は、補強部３が両面粘着テープ２によって振動板基材１に従来のような気泡も残存することなく貼着されることとなり、これによって高温領域における分割振動による歪みを低減されることとなる。又両面粘着テープ２を用いて補強部３を振動板基材１に貼着した結果、従来のように熱硬化性エポキシ接着剤の硬化反応が開始されるまでの放置時間を必要とせず、熱硬化性エポキシ接着剤の振動板への塗布から型成形までの間製作作業を中断させることなく、製作工程時間を短縮することができる。
【００１３】
又、図３及び図４は、本発明の第２の実施例を示すもので、図３は成形前の振動板を示す斜視図、図４は、成形後の振動板の縦断面図である。
【００１４】
図３及び図４において、１はポリエチレンフィルムからなる振動板基材、５は振動板基材１の成形温度範囲内では硬化せず粘着性を維持する接着剤からなる両面粘着テープが構成する補強部で、この補強部５の一面は振動板基材１に貼着されている。そして、図３に示す振動板基材１が平板状となっている状態から、振動板成形金型内に挿入し、加熱成形することにより、補強部３を硬化させずに振動板基材１に貼着して一体化して、図４に示すような波型に成形して、振動板４を成形し、その後、補強部３の他面に、ボイスコイル６を接合してなるものである。
【００１５】
したがって、この振動板４は、補強部５が両面粘着テープによって形成されている結果、振動板基材１に従来のような気泡も残存することなく貼着されることとなり、これによって高温領域における分割振動による歪みを低減されることとなる。又両面粘着テープにより補強部５を形成した結果、従来のように熱硬化性エポキシ接着剤の硬化反応が開始されるまでの放置時間を必要とせず、熱硬化性エポキシ接着剤の振動板への塗布から型成形までの間製作作業を中断させることなく、製作工程時間を短縮することができる。更に補強部５を構成する両面粘着テープは、振動板基材１の成形温度範囲内では硬化せず粘着性を維持する接着剤を用いた結果、振動板４の成形後において、別な接着剤を塗布することなく補強部５にボイスコイル６を接合することができ好都合である。
【００１６】
【発明の効果】
以上の構成にかかるダイナミックマイクロホン用振動板は、振動板基材と補強部とを、加熱成形可能な合成ゴム系又はアクリル系の接着剤からなる両面粘着テープを用いて貼付するか、または振動板基材１の成形温度範囲内では硬化せず粘着性を維持する接着剤からなる両面粘着テープ自身で補強部を形成するようにしたため、従来のように熱硬化性エポキシ接着剤の硬化反応が開始されるまでの放置時間を必要とせず、熱硬化性エポキシ接着剤の振動板への塗布から型成形までの間製作作業を中断させることなく、製作工程時間を短縮することができる。また、両面粘着テープを用いることにより、振動板と補強部との密着性が確保でき、振動板と補強部との間に気泡が残存せず、これによって高音領域における振動板の分割振動による歪むを低減させることができる。
【図面の簡単な説明】
【図１】本発明の第１実施例による成形前の振動板を示す斜視図
【図２】同じく成形後の振動板の縦断面図
【図３】本発明の第２実施例による成形前の振動板を示す斜視図
【図４】同じく成形後の振動板の縦断面図
【図５】成形後における従来の一例による振動板の縦断面図
【図６】成形後における他の従来例による振動板の縦断面図
【符号の説明】
１ 振動板基材
２ 粘着テープ
３ 補強部
４ 振動板
５ 補強部
６ ボイスコイル[0001]
[Industrial applications]
The present invention relates to a dynamic microphone diaphragm mainly used for vocals and loudspeakers.
[0002]
[Prior art]
Conventional devices of this type include, for example, those shown in FIGS. That is, in FIG. 5, a reinforcing portion 8 is formed by applying a thermosetting epoxy adhesive to a part of the diaphragm 7. The diaphragm 7 is made of a polyethylene film, a thermosetting epoxy resin is applied to a central portion thereof, and is left at room temperature for 4 to 5 hours until a curing reaction starts. By inserting, heating, and pressing, the thermosetting epoxy resin is completely cured, and the diaphragm 7 is formed into a predetermined shape and manufactured.
[0003]
FIG. 6 shows a reinforcing member 10 formed by attaching a polyethylene film to the center portion of a diaphragm 9 formed of a polyethylene film using an adhesive 11. The adhesive 11 is fixed to the diaphragm 9 so as to correspond to the outer peripheral portion and the central portion of the reinforcing portion 10. The curing reaction of the adhesive 11 is the same as that shown in FIG.
[0004]
[Problems to be solved by the invention]
However, such conventional diaphragms for dynamic microphones 7 and 9 require a standing time until the reinforcing reaction is formed or the curing reaction of the thermosetting epoxy adhesive forming the adhesive 11 is started. However, the production work is interrupted from the application of the thermosetting epoxy adhesive to the diaphragm 7 to the molding, which causes a time loss in the production process, which is a very inefficient method for producing the diaphragm. I have to say.
[0005]
In addition, the one shown in FIG. 6 adheres the reinforcing portion 10 to the diaphragm 9 using the adhesive 11, and it is difficult to secure the adhesion between the diaphragm 9 and the reinforcing portion 10. It is conceivable that air bubbles remain between the reinforcing member and the reinforcing portion 10, thereby reducing the effect of reducing the distortion caused by the divided vibration of the diaphragm 9 in the high-frequency region.
[0006]
Accordingly, the present invention provides a diaphragm for a dynamic microphone in which reinforcement measures have been taken to effectively reduce distortion due to the diaphragm in a high-temperature region, and also allows bonding between the voice coil and the diaphragm without requiring application of an adhesive. It is an object of the present invention to provide a realized diaphragm for a dynamic microphone.
[0007]
[Means for Solving the Problems]
Diaphragm for dynamic microphones of the present invention, the first, the part of the vibration plate substrate composed of a polyethylene film, to form a reinforcing portion by attaching a polyethylene film and forms configured by double-sided adhesive tape.
[0008]
[Action]
According to the present invention, the diaphragm base material and the reinforcing portion are stuck using a double-sided pressure-sensitive adhesive tape made of a heat-moldable synthetic rubber or acrylic adhesive, or a heat-moldable synthetic rubber or The double-sided pressure-sensitive adhesive tape made of acrylic adhesive forms the reinforcement part itself, so there is no need for a standing time until the curing reaction of the thermosetting epoxy adhesive starts, unlike the conventional method. The production process time can be shortened without interrupting the production work from application of the epoxy adhesive to the diaphragm to molding. In addition, by using the double-sided adhesive tape, adhesion between the diaphragm and the reinforcing portion can be ensured, and no bubbles remain between the diaphragm and the reinforcing portion, thereby distorting due to the divided vibration of the diaphragm in the high-frequency region. Can be reduced.
[0009]
Further, by using an adhesive that does not cure within the molding temperature range of the diaphragm and maintains the adhesiveness as the adhesive for the double-sided adhesive tape, the voice coil can be joined to the diaphragm without the adhesive.
[0010]
【Example】
1 and 2 show a first embodiment of the present invention. FIG. 1 is a perspective view showing a diaphragm before molding, and FIG. 2 is a longitudinal sectional view of the diaphragm after molding. is there.
[0011]
1 and 2, reference numeral 1 denotes a diaphragm base made of a polyethylene film, 2 denotes a double-sided pressure-sensitive adhesive tape formed of a heat-moldable synthetic rubber or acrylic adhesive, and 3 denotes a diaphragm base from the double-sided pressure-sensitive adhesive tape 2. 1 is a reinforcing portion made of a polyethylene film adhered to a part (central portion) of the device. The double-sided pressure-sensitive adhesive tape 2 and the reinforcing portion 3 are formed by pasting both materials in advance and punching them out to a predetermined size. As shown in the drawing, the polyethylene film forming the reinforcing portion 3 is adhered to the diaphragm base material 1 by being inserted into a mold for forming the diaphragm and then heat-molded, and integrated with each other. The vibration plate 4 is formed by shaping into a corrugated shape as shown in FIG.
[0012]
Therefore, in the diaphragm 4, the reinforcing portion 3 is adhered to the diaphragm substrate 1 by the double-sided adhesive tape 2 without leaving any bubbles as in the related art, whereby distortion due to split vibration in a high temperature region is reduced. It will be reduced. In addition, as a result of attaching the reinforcing portion 3 to the diaphragm base material 1 using the double-sided adhesive tape 2, a standing time until the curing reaction of the thermosetting epoxy adhesive is started is not required as in the related art, The manufacturing process time can be reduced without interrupting the manufacturing operation from application of the curable epoxy adhesive to the diaphragm to molding.
[0013]
FIGS. 3 and 4 show a second embodiment of the present invention. FIG. 3 is a perspective view showing a diaphragm before molding, and FIG. 4 is a longitudinal sectional view of the diaphragm after molding. .
[0014]
3 and 4, reference numeral 1 denotes a diaphragm base made of a polyethylene film, and 5 denotes a double-sided pressure-sensitive adhesive tape made of an adhesive that does not cure within the molding temperature range of the diaphragm base 1 and maintains tackiness. In this portion, one surface of the reinforcing portion 5 is adhered to the diaphragm base material 1. Then, the diaphragm base material 1 shown in FIG. 3 is inserted into a diaphragm forming mold from the state where the diaphragm base material 1 is in a flat shape and is subjected to heat molding, so that the reinforcing member 3 is not cured and the diaphragm base material 1 is hardened. And formed into a corrugated shape as shown in FIG. 4 to form the diaphragm 4, and thereafter, the voice coil 6 is joined to the other surface of the reinforcing portion 3. .
[0015]
Therefore, as a result of the reinforcing portion 5 being formed of the double-sided adhesive tape, the diaphragm 4 is adhered to the diaphragm substrate 1 without leaving any bubbles as in the related art. The distortion due to the divided vibration is reduced. In addition, as a result of forming the reinforcing portion 5 with the double-sided adhesive tape, the standing time until the curing reaction of the thermosetting epoxy adhesive is started is not required as in the related art, and the thermosetting epoxy adhesive is applied to the diaphragm. The production process time can be reduced without interrupting the production work from application to molding. Further, the double-sided pressure-sensitive adhesive tape constituting the reinforcing portion 5 uses an adhesive which does not cure within the molding temperature range of the diaphragm base material 1 and maintains the adhesiveness. This is advantageous because the voice coil 6 can be joined to the reinforcing portion 5 without applying the same.
[0016]
【The invention's effect】
The diaphragm for a dynamic microphone according to the above configuration, the diaphragm base material and the reinforcing portion, affixed using a double-sided adhesive tape made of heat-moldable synthetic rubber or acrylic adhesive, or the diaphragm Since the reinforcing portion is formed by the double-sided pressure-sensitive adhesive tape itself made of an adhesive which does not cure within the molding temperature range of the base material 1 and maintains the tackiness, the curing reaction of the thermosetting epoxy adhesive starts as in the conventional case. The manufacturing process time can be shortened without requiring a standing time until the process is completed, and without interrupting the manufacturing operation from application of the thermosetting epoxy adhesive to the diaphragm to molding. In addition, by using the double-sided adhesive tape, adhesion between the diaphragm and the reinforcing portion can be ensured, and no bubbles remain between the diaphragm and the reinforcing portion, thereby distorting due to the divided vibration of the diaphragm in the high-frequency region. Can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a diaphragm before molding according to a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the diaphragm after molding according to the first embodiment. FIG. FIG. 4 is a longitudinal sectional view of a diaphragm after molding. FIG. 5 is a longitudinal sectional view of a conventional diaphragm after molding. FIG. 6 is a vibration of another conventional diaphragm after molding. Longitudinal cross section of plate [Explanation of symbols]
REFERENCE SIGNS LIST 1 diaphragm base material 2 adhesive tape 3 reinforcing section 4 diaphragm 5 reinforcing section 6 voice coil

Claims (1)

ポリエチレンフィルムからなる振動板基材の一部に、加熱成形可能な合成ゴム系又はアクリル系の接着剤からなる両面粘着テープによりポリエチレンフィルムを貼付して補強部を形成して成るダイナミックマイクロホン用振動板。A diaphragm for a dynamic microphone formed by attaching a polyethylene film to a part of a diaphragm base material made of a polyethylene film with a double-sided adhesive tape made of a synthetic rubber-based or acrylic adhesive that can be heat-formed to form a reinforcing portion. .
JP15354894A 1994-07-05 1994-07-05 Diaphragm for dynamic microphone Expired - Fee Related JP3561954B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15354894A JP3561954B2 (en) 1994-07-05 1994-07-05 Diaphragm for dynamic microphone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15354894A JP3561954B2 (en) 1994-07-05 1994-07-05 Diaphragm for dynamic microphone

Publications (2)

Publication Number Publication Date
JPH0823596A JPH0823596A (en) 1996-01-23
JP3561954B2 true JP3561954B2 (en) 2004-09-08

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ID=15564922

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15354894A Expired - Fee Related JP3561954B2 (en) 1994-07-05 1994-07-05 Diaphragm for dynamic microphone

Country Status (1)

Country Link
JP (1) JP3561954B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101948826B1 (en) * 2018-04-26 2019-05-02 박래범 Diaphragm
KR102028854B1 (en) * 2019-01-24 2019-11-14 박래범 Diaphragm

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4473068B2 (en) * 2003-08-19 2010-06-02 パナソニック株式会社 Speaker

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS631515Y2 (en) * 1981-04-27 1988-01-14
JPS62156928A (en) * 1985-12-28 1987-07-11 Mitsui Petrochem Ind Ltd Manufacture of polyethylene film

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101948826B1 (en) * 2018-04-26 2019-05-02 박래범 Diaphragm
WO2019209062A1 (en) * 2018-04-26 2019-10-31 (주) 파켐코리아 Diaphragm
KR102028854B1 (en) * 2019-01-24 2019-11-14 박래범 Diaphragm

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