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JPH06122857A - Conductive adhesive and method for adhering - Google Patents

Conductive adhesive and method for adhering

Info

Publication number
JPH06122857A
JPH06122857A JP31259492A JP31259492A JPH06122857A JP H06122857 A JPH06122857 A JP H06122857A JP 31259492 A JP31259492 A JP 31259492A JP 31259492 A JP31259492 A JP 31259492A JP H06122857 A JPH06122857 A JP H06122857A
Authority
JP
Japan
Prior art keywords
adhesive
conductive
magnetic field
conductors
ferromagnetic particles
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.)
Pending
Application number
JP31259492A
Other languages
Japanese (ja)
Inventor
Takaharu Mamiya
崇治 間宮
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.)
Nippon Ferrofluidics Corp
Original Assignee
Nippon Ferrofluidics Corp
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 Nippon Ferrofluidics Corp filed Critical Nippon Ferrofluidics Corp
Priority to JP31259492A priority Critical patent/JPH06122857A/en
Publication of JPH06122857A publication Critical patent/JPH06122857A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/30Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H05K3/321Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives

Landscapes

  • Adhesives Or Adhesive Processes (AREA)
  • Conductive Materials (AREA)

Abstract

PURPOSE:To obtain the conductive adhesive surely giving conductivity. and to provide the method for adhering. CONSTITUTION:Ferromagnetic particles 3 having conductivity at least on their surfaces are dispersed in an uncured adhesive 5. The adhesive 5 containing the ferromagnetic particles 3 dispersed therein is disposed between both conductors 1, 2, and a magnetic field is applied to the adhesive 5 from one conductor 1 to the other conductor 2. While the magnetic field is continuously applied, the adhesive 5 is cured.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は確実な導通が得られる
導電性接着剤及び接着方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive adhesive and a bonding method capable of ensuring reliable conduction.

【0002】[0002]

【従来の技術】従来の導電性接着剤は、例えば図3に示
すようなハードディスク等に用いられるモータのシール
部において使用されている。同図において、上記シール
部は、永久磁石51とリング状のポールピース52、5
3とから成るシール体54と、シャフト56の外周面と
上記ポールピース52、53の内周面との間隙に介装さ
れる磁性流体55とから構成されている。このシール体
54と磁性流体55とが共働してシャフト56の軸方向
の空気流を遮断し、ホコリ等の内部流入を防止してい
る。導電性接着剤59は、シール体54の固定、及びシ
ール体54からモータハブ58に至る導通を可能にして
シール体54のアースをとるために、ポールピース53
と、ハウジング57と、モータハブ58との間に塗布さ
れている。なお60は密封用接着剤である。
2. Description of the Related Art A conventional conductive adhesive is used, for example, in a seal portion of a motor used for a hard disk as shown in FIG. In the figure, the above-mentioned seal portion is composed of a permanent magnet 51 and a ring-shaped pole piece 52, 5.
3 and a magnetic fluid 55 interposed in the gap between the outer peripheral surface of the shaft 56 and the inner peripheral surfaces of the pole pieces 52, 53. The seal body 54 and the magnetic fluid 55 work together to block the axial air flow of the shaft 56 and prevent the inflow of dust and the like. The conductive adhesive 59 fixes the seal body 54 and allows conduction from the seal body 54 to the motor hub 58 to ground the seal body 54 so as to ground the seal body 54.
Is applied between the housing 57 and the motor hub 58. Reference numeral 60 is a sealing adhesive.

【0003】[0003]

【発明が解決しようとする課題】ところで上記導電性接
着剤は、上記導通を得るために導電性の金属粉を接着剤
中に含有させている。しかしこの金属粉は、塗布当初は
均一な分散状態にあるために一方の面から他方に至る導
電回路を形成しているものの、その後沈降、凝集等によ
って未硬化のうちに偏在してしまう。このため上記回路
が壊れ、この状態で接着剤が硬化するため、硬化後は充
分な導通が得られない場合がある。また導通を確実に得
ようとして金属粉の含有量を増加すると、逆に接着剤の
接着力が低下するという問題が生じる。
By the way, in the above conductive adhesive, conductive metal powder is contained in the adhesive in order to obtain the above conduction. However, this metal powder forms a conductive circuit from one surface to the other since it is in a uniformly dispersed state at the beginning of application, but thereafter it is unevenly distributed while being uncured due to sedimentation, aggregation and the like. As a result, the circuit is broken, and the adhesive cures in this state, so that sufficient conduction may not be obtained after curing. In addition, when the content of the metal powder is increased in order to surely obtain conduction, there is a problem that the adhesive force of the adhesive is reduced.

【0004】この発明は上記従来の欠点を解決するため
になされたものであって、その目的は、接着力を低下さ
せることなく導通が確実に得られる導電性接着剤及び接
着方法を提供することにある。
The present invention has been made in order to solve the above-mentioned conventional drawbacks, and an object thereof is to provide a conductive adhesive and a bonding method capable of surely obtaining conduction without lowering the adhesive force. It is in.

【0005】[0005]

【課題を解決するための手段】そこで請求項1の導電性
接着剤は、一対の導電体1、2間に介装されて、この両
導電体1、2を導通可能に接着固定する導電性接着剤に
おいて、未硬化接着剤5に、少なくとも表面が導電性を
有する強磁性粒子3を分散させていることを特徴として
いる。
Therefore, the conductive adhesive according to claim 1 is interposed between a pair of conductors 1 and 2 so that the conductors 1 and 2 can be conductively bonded and fixed. In the adhesive, the uncured adhesive 5 is characterized in that at least the ferromagnetic particles 3 having conductivity are dispersed.

【0006】また請求項2の導電性接着剤は、上記強磁
性粒子3の表面に、金、銀等の高導電性メッキ層4を形
成したことを特徴としている。
The conductive adhesive of claim 2 is characterized in that a highly conductive plated layer 4 of gold, silver or the like is formed on the surface of the ferromagnetic particles 3.

【0007】さらに請求項3の接着方法は、一対の導電
体1、2を導通可能に接着固定する接着方法において、
未硬化接着剤5に、少なくとも表面が導電性を有する強
磁性粒子3を分散し、この強磁性粒子3が分散している
未硬化接着剤5を上記両導電体1、2間に介装し、一方
の導電体1から他方の導電体2方向に磁場を作用させ、
上記磁場を作用させた状態で上記未硬化接着剤5を硬化
させることを特徴としている。
Further, the bonding method according to claim 3 is a bonding method for bonding and fixing a pair of conductors 1 and 2 in a conductive manner.
The uncured adhesive 5 is dispersed with at least the ferromagnetic particles 3 having a conductive surface, and the uncured adhesive 5 in which the ferromagnetic particles 3 are dispersed is interposed between the conductors 1 and 2. , A magnetic field is applied from one conductor 1 to the other conductor 2,
It is characterized in that the uncured adhesive 5 is cured while the magnetic field is applied.

【0008】[0008]

【作用】上記請求項1の導電性接着剤及び請求項3の接
着方法では、一方の導電体1から他方の導電体2方向に
磁場を作用させると、両導電体1、2間に介装された未
硬化接着剤5中の強磁性粒子3が磁束の流れに沿うよう
に連接して柱状化するので、一方の導電体1と他方の導
電体2とが上記柱状化した強磁性粒子3を介して接続さ
れる。この強磁性粒子3は少なくとも表面が導電性を有
しているので、上記連接して柱状化した強磁性粒子3
は、一方の導電体1から他方の導電体2に至る導電回路
となる。そして磁場を作用させた状態で接着剤5を硬化
させると、強磁性粒子3はそのまま固定されるので磁場
の作用を解除しても上記導電回路は形成されたままとな
る。
According to the conductive adhesive of the above-mentioned claim 1 and the bonding method of the above-mentioned claim 3, when a magnetic field is applied from one conductor 1 to the other conductor 2, it is interposed between the conductors 1 and 2. Since the ferromagnetic particles 3 in the uncured adhesive 5 are connected to each other along the flow of the magnetic flux to be columnar, one of the conductors 1 and the other conductor 2 has the columnar ferromagnetic particles 3 described above. Connected via. Since at least the surface of the ferromagnetic particles 3 has conductivity, the ferromagnetic particles 3 which are columnarly connected to each other are columnar.
Is a conductive circuit from one conductor 1 to the other conductor 2. Then, when the adhesive 5 is cured in a state where a magnetic field is applied, the ferromagnetic particles 3 are fixed as they are, and therefore the conductive circuit remains formed even if the action of the magnetic field is released.

【0009】また請求項2の導電性接着剤は、強磁性粒
子3の表面に金、銀等の高導電性メッキ層4を形成して
いるので、上記導電回路の導電性の向上を図れる。
Further, in the conductive adhesive of the second aspect, since the highly conductive plating layer 4 of gold, silver or the like is formed on the surface of the ferromagnetic particles 3, the conductivity of the conductive circuit can be improved.

【0010】[0010]

【実施例】次にこの発明の導電性接着剤及び接着方法の
具体的な実施例について、図面を参照しつつ詳細に説明
する。図1は磁場を作用させる以前の接着剤層の内部状
態を、図2は磁場を作用させている接着剤層の内部状態
をそれぞれ模式的に示す断面図である。両図において、
1、2は導電性を有する部材(導電体)であり、5は
熱、紫外線、超音波等によって硬化する接着剤である。
この接着剤5中には、図1に示すように、その表面に高
導電性メッキ層4が形成され、強磁性を有する金属粒子
(強磁性粒子)3を分散させている。この強磁性金属粒
子3は、粒径が20〜30μm程度であり、その材質は
鉄、ニッケル、コバルト及びこれらの合金等である。な
お分散量は接着剤5の粘度、磁場の強さ等によって調節
するものである。また高導電性メッキ層4は、例えば
金、銀によって形成されている。
Next, specific examples of the conductive adhesive and the bonding method of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view schematically showing the internal state of the adhesive layer before the magnetic field is applied, and FIG. 2 is a sectional view schematically showing the internal state of the adhesive layer being operated by the magnetic field. In both figures,
Reference numerals 1 and 2 denote conductive members (electric conductors), and 5 denotes an adhesive that is cured by heat, ultraviolet rays, ultrasonic waves, or the like.
As shown in FIG. 1, a highly conductive plating layer 4 is formed on the surface of the adhesive 5, and metal particles (ferromagnetic particles) 3 having ferromagnetism are dispersed therein. The ferromagnetic metal particles 3 have a particle size of about 20 to 30 μm, and the material thereof is iron, nickel, cobalt and alloys thereof. The amount of dispersion is adjusted by the viscosity of the adhesive 5 and the strength of the magnetic field. The high-conductivity plating layer 4 is made of, for example, gold or silver.

【0011】以上のように図1は上記接着剤5を部材
1、2間に介装した状態、つまり強磁性金属粒子3が分
散する未硬化の接着剤5を一方の部材1の下面1bに塗
布し、この塗布面に他方の部材2の上面2aが密接する
ように押圧した状態を示すものである。上記の接着剤5
において、塗布後、接着剤が未硬化のときに一方の部材
1から他方の部材2方向に磁場を作用させると、強磁性
金属粒子3は強磁性を有するので磁化される。このため
図2に示すように、強磁性金属粒子3は一端側に偏在す
ることなく、上記磁束の方向に沿うように連接して柱状
化し、一方の部材1の下面1bと他方の部材2の上面2
aを接続することになる。この強磁性金属粒子3はその
表面に金銀等の高導電率を有する導電性メッキ層4を形
成しているので、強磁性金属粒子3が連接して柱状化す
ることによって、一方の部材1の下面1bから他方の部
材2の上面2aに至る導電回路が形成されることにな
る。そして磁場の作用を継続したままで接着剤5に熱、
紫外線、超音波等を作用させて硬化させると、強磁性金
属粒子3はそのままの状態で固定されるので導電回路も
固定できる。したがって磁場の作用を解除しても導電回
路は壊れることはない。
As described above, FIG. 1 shows a state in which the adhesive 5 is interposed between the members 1 and 2, that is, the uncured adhesive 5 in which the ferromagnetic metal particles 3 are dispersed is attached to the lower surface 1b of one member 1. It shows a state in which the upper surface 2a of the other member 2 has been applied and pressed so that the upper surface 2a of the other member 2 closely contacts the applied surface. Adhesive 5 above
In, when a magnetic field is applied from one member 1 to the other member 2 while the adhesive is uncured after application, the ferromagnetic metal particles 3 have magnetism and thus are magnetized. Therefore, as shown in FIG. 2, the ferromagnetic metal particles 3 are not unevenly distributed on one end side but are connected and columnar along the direction of the magnetic flux, and the lower surface 1b of one member 1 and the other member 2 are formed. Upper surface 2
a will be connected. Since the ferromagnetic metal particles 3 have a conductive plating layer 4 having high conductivity such as gold and silver formed on the surface thereof, the ferromagnetic metal particles 3 are connected to form a columnar shape, so that one member 1 A conductive circuit from the lower surface 1b to the upper surface 2a of the other member 2 is formed. Then, heat the adhesive 5 while continuing the action of the magnetic field,
If the ferromagnetic metal particles 3 are fixed as they are by applying ultraviolet rays, ultrasonic waves, or the like, the conductive circuit can also be fixed. Therefore, even if the action of the magnetic field is released, the conductive circuit is not broken.

【0012】以上の説明のように上記実施例における導
電性接着剤及び接着方法においては、接着剤5を塗布後
未硬化のうちに一方の部材1から他方の部材2の方向に
磁場を作用させて、接着剤5中の強磁性粒子3によって
一方の部材1から他方の部材2へ至る導電回路を形成
し、その後接着剤5を硬化させることによって上記導電
回路を固定するようにしているので、両部材1、2間の
導通を確実に得ることができる。
As described above, in the conductive adhesive and the bonding method in the above embodiments, the magnetic field is applied from one member 1 to the other member 2 while the adhesive 5 is not yet cured after being applied. Then, the conductive particles from the one member 1 to the other member 2 are formed by the ferromagnetic particles 3 in the adhesive 5, and the adhesive 5 is cured to fix the conductive circuit. It is possible to reliably obtain conduction between the members 1 and 2.

【0013】また磁場の作用によって強磁性金属粒子3
を連接して柱状化し導電回路を形成するので、強磁性金
属粒子3の含有量は、導電回路の形成に必要な量だけで
充分であり、従来のようにその量を余分に増加させなく
ても導通を確実に得ることができる。したがって含有量
の増加による接着剤5の接着力の低下を抑制できる。
Ferromagnetic metal particles 3 are also generated by the action of a magnetic field.
Since they are connected to form a columnar shape to form a conductive circuit, the content of the ferromagnetic metal particles 3 is sufficient only for forming the conductive circuit, and the amount is not increased excessively as in the conventional case. Can surely obtain conduction. Therefore, it is possible to suppress the decrease in the adhesive strength of the adhesive 5 due to the increase in the content.

【0014】そして強磁性金属粒子3の表面には高導電
性のメッキ層4を形成しているので、この強磁性金属粒
子3が連接して柱状化して形成する導電回路の導電性を
向上できる。このため一段と確実な導通を得ることがで
きる。
Since the highly conductive plating layer 4 is formed on the surface of the ferromagnetic metal particles 3, the conductivity of the conductive circuit formed by connecting the ferromagnetic metal particles 3 into a columnar shape can be improved. . Therefore, more reliable conduction can be obtained.

【0015】[0015]

【発明の効果】以上のように請求項1の導電性接着剤及
び請求項3の接着方法では、接着剤が未硬化のうちに磁
場を作用させることによって強磁性粒子による導電回路
を形成し、その後接着剤を硬化させることによってこの
回路を固定するようにしているので、両導電体間の導通
を確実に得ることができる。さらに強磁性粒子の含有量
は導電回路の形成に必要な量のみでよいので、接着剤の
接着力の低下を抑制できる。
As described above, in the conductive adhesive of claim 1 and the bonding method of claim 3, a magnetic field is applied while the adhesive is uncured to form a conductive circuit by ferromagnetic particles, After that, since the circuit is fixed by hardening the adhesive, it is possible to surely obtain conduction between both the conductors. Further, since the content of the ferromagnetic particles is only required to form the conductive circuit, it is possible to suppress the decrease in the adhesive force of the adhesive.

【0016】また請求項2のようにすれば、一段と確実
な導通を得ることができる。
According to the second aspect, more reliable conduction can be obtained.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の実施例の磁場作用前の接着剤層の内
部状態を模式的に示す断面図である。
FIG. 1 is a sectional view schematically showing the internal state of an adhesive layer before the action of a magnetic field according to an example of the present invention.

【図2】上記実施例の磁場作用後の接着剤層の内部状態
を模式的に示す断面図である。
FIG. 2 is a cross-sectional view schematically showing the internal state of the adhesive layer after the action of a magnetic field in the above example.

【図3】従来例の使用状態を説明する図である。FIG. 3 is a diagram illustrating a usage state of a conventional example.

【符号の説明】[Explanation of symbols]

1 導電体 2 導電体 3 強磁性粒子 4 高導電性メッキ層 5 接着剤 1 Conductor 2 Conductor 3 Ferromagnetic Particle 4 Highly Conductive Plating Layer 5 Adhesive

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 一対の導電体(1)(2)間に介装され
て、この両導電体(1)(2)を導通可能に接着固定す
る導電性接着剤において、未硬化接着剤(5)に、少な
くとも表面が導電性を有する強磁性粒子(3)を分散さ
せていることを特徴とする導電性接着剤。
1. A conductive adhesive, which is interposed between a pair of conductors (1) and (2) to bond and fix both conductors (1) and (2) in a conductive manner, wherein an uncured adhesive ( 5) A conductive adhesive characterized in that at least ferromagnetic particles (3) having conductivity on the surface are dispersed.
【請求項2】 上記強磁性粒子(3)の表面に、金、銀
等の高導電性メッキ層(4)を形成したことを特徴とす
る請求項1の導電性接着剤。
2. The conductive adhesive according to claim 1, wherein a highly conductive plating layer (4) of gold, silver or the like is formed on the surface of the ferromagnetic particles (3).
【請求項3】 一対の導電体(1)(2)を導通可能に
接着固定する接着方法において、未硬化接着剤(5)
に、少なくとも表面が導電性を有する強磁性粒子(3)
を分散し、この強磁性粒子(3)が分散している未硬化
接着剤(5)を上記両導電体(1)(2)間に介装し、
一方の導電体(1)から他方の導電体(2)方向に磁場
を作用させ、上記磁場を作用させた状態で上記未硬化接
着剤(5)を硬化させることを特徴とする接着方法。
3. An uncured adhesive (5) in a bonding method for bonding and fixing a pair of conductors (1) and (2) in a conductive manner.
And ferromagnetic particles having at least surface conductivity (3)
And the uncured adhesive (5) in which the ferromagnetic particles (3) are dispersed are interposed between the both conductors (1) and (2),
A bonding method, wherein a magnetic field is applied from one conductor (1) to the other conductor (2), and the uncured adhesive (5) is cured in the state where the magnetic field is applied.
JP31259492A 1992-10-09 1992-10-09 Conductive adhesive and method for adhering Pending JPH06122857A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31259492A JPH06122857A (en) 1992-10-09 1992-10-09 Conductive adhesive and method for adhering

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31259492A JPH06122857A (en) 1992-10-09 1992-10-09 Conductive adhesive and method for adhering

Publications (1)

Publication Number Publication Date
JPH06122857A true JPH06122857A (en) 1994-05-06

Family

ID=18031083

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31259492A Pending JPH06122857A (en) 1992-10-09 1992-10-09 Conductive adhesive and method for adhering

Country Status (1)

Country Link
JP (1) JPH06122857A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5769996A (en) * 1994-01-27 1998-06-23 Loctite (Ireland) Limited Compositions and methods for providing anisotropic conductive pathways and bonds between two sets of conductors
US5851644A (en) * 1995-08-01 1998-12-22 Loctite (Ireland) Limited Films and coatings having anisotropic conductive pathways therein
US5916641A (en) * 1996-08-01 1999-06-29 Loctite (Ireland) Limited Method of forming a monolayer of particles
US6180226B1 (en) 1996-08-01 2001-01-30 Loctite (R&D) Limited Method of forming a monolayer of particles, and products formed thereby
JP2002158051A (en) * 2000-11-17 2002-05-31 Jsr Corp Anisotropic conductive sheet
US6402876B1 (en) 1997-08-01 2002-06-11 Loctite (R&D) Ireland Method of forming a monolayer of particles, and products formed thereby
KR20020075329A (en) * 2002-08-12 2002-10-04 최장렬 Adhesives Contained Ferromagnetic Substance
US6977025B2 (en) 1996-08-01 2005-12-20 Loctite (R&D) Limited Method of forming a monolayer of particles having at least two different sizes, and products formed thereby

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5769996A (en) * 1994-01-27 1998-06-23 Loctite (Ireland) Limited Compositions and methods for providing anisotropic conductive pathways and bonds between two sets of conductors
US6110399A (en) * 1994-01-27 2000-08-29 Loctite (Ireland) Limited Compositions and method for providing anisotropic conductive pathways and bonds between two sets of conductors
US5851644A (en) * 1995-08-01 1998-12-22 Loctite (Ireland) Limited Films and coatings having anisotropic conductive pathways therein
US6149857A (en) * 1995-08-01 2000-11-21 Loctite (R&D) Limited Method of making films and coatings having anisotropic conductive pathways therein
US5916641A (en) * 1996-08-01 1999-06-29 Loctite (Ireland) Limited Method of forming a monolayer of particles
US6180226B1 (en) 1996-08-01 2001-01-30 Loctite (R&D) Limited Method of forming a monolayer of particles, and products formed thereby
US6977025B2 (en) 1996-08-01 2005-12-20 Loctite (R&D) Limited Method of forming a monolayer of particles having at least two different sizes, and products formed thereby
US6402876B1 (en) 1997-08-01 2002-06-11 Loctite (R&D) Ireland Method of forming a monolayer of particles, and products formed thereby
JP2002158051A (en) * 2000-11-17 2002-05-31 Jsr Corp Anisotropic conductive sheet
KR20020075329A (en) * 2002-08-12 2002-10-04 최장렬 Adhesives Contained Ferromagnetic Substance

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