JPS6249643B2 - - Google Patents
Info
- Publication number
- JPS6249643B2 JPS6249643B2 JP14672275A JP14672275A JPS6249643B2 JP S6249643 B2 JPS6249643 B2 JP S6249643B2 JP 14672275 A JP14672275 A JP 14672275A JP 14672275 A JP14672275 A JP 14672275A JP S6249643 B2 JPS6249643 B2 JP S6249643B2
- Authority
- JP
- Japan
- Prior art keywords
- shield case
- core
- magnetic head
- conductive adhesive
- filled
- 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
- 229920005989 resin Polymers 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 13
- 239000000853 adhesive Substances 0.000 claims description 11
- 230000001070 adhesive effect Effects 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 239000006185 dispersion Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 239000002609 medium Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 239000012790 adhesive layer Substances 0.000 description 2
- 239000002612 dispersion medium Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- MOFOBJHOKRNACT-UHFFFAOYSA-N nickel silver Chemical compound [Ni].[Ag] MOFOBJHOKRNACT-UHFFFAOYSA-N 0.000 description 1
- 239000010956 nickel silver Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Landscapes
- Adhesives Or Adhesive Processes (AREA)
Description
【発明の詳細な説明】
(イ) 産業上の利用分野
本発明は、シールドケースとこのシールドケー
ス内に収納されるコアーとを電気的並びに機械的
に確実に接合することが出来る新規な磁気ヘツド
に関するものである。[Detailed Description of the Invention] (a) Industrial Application Field The present invention provides a novel magnetic head that can electrically and mechanically reliably connect a shield case and a core housed in the shield case. It is related to.
(ロ) 従来の技術
従来、例えばオーデイオ用の磁気ヘツドは一般
的に第１図イに示したような内部構成になつてお
り、同図における１はパーマロイの如き高透磁率
を呈する材料で形成されたシールドケース、２
ａ，２ｂは一対のコアー、３ａ，３ｂはそのコア
ー２ａ，２ｂ上に巻回したコイル、４は真鍮又は
洋白の如き非磁性材よりなり前記コアー２ａ，２
ｂを保持するホルダー、５は前記シールドケース
１とホルダー４の電気的な接続を確保するリン青
銅の如き弾性を有する接触片、６は内部固定用の
樹脂材料であり電気的絶縁性の高いエポキシ系樹
脂等が利用されている。尚、第１図ロは斯る磁気
ヘツドの正面を示したものであり、前記シールド
ケース１に設けた開口にホルダー４、作動ギヤツ
プ部２′を有する一対のコアー２ａ，２ｂの先端
部、及び内部固定用の樹脂６がそれぞれ図示の如
く臨設されている。(b) Conventional technology Conventionally, for example, a magnetic head for audio generally has an internal configuration as shown in Figure 1A, where 1 in the figure is made of a material exhibiting high magnetic permeability such as permalloy. shield case, 2
a and 2b are a pair of cores; 3a and 3b are coils wound on the cores 2a and 2b; and 4 is made of a non-magnetic material such as brass or nickel silver.
5 is an elastic contact piece such as phosphor bronze that secures the electrical connection between the shield case 1 and the holder 4; 6 is a resin material for internal fixation, and epoxy with high electrical insulation; resins, etc. are used. FIG. 1B shows the front side of such a magnetic head, and shows the holder 4 in the opening provided in the shield case 1, the tips of the pair of cores 2a and 2b having the operating gap part 2', and A resin 6 for internal fixation is provided as shown in the figure.
そして、この様な構成の磁気ヘツドでは磁気媒
体との摺動摩擦によりそのコアー先端部に生じる
静電気を逃がすために、コアーをシールドケース
を介して接地するようにしており、このコアーと
シールドケース間の電気的接続をホルダー及び接
触片を介して実現している。従つて、このコアー
の安定で且つ十分低い接地抵抗を得るためには、
コアーとホルダー、ホルダーと接触片、及び接触
片とシールドケースの３個所で完全な接触状態を
実現する必要がある。 In a magnetic head with such a configuration, the core is grounded through the shield case in order to release static electricity generated at the tip of the core due to sliding friction with the magnetic medium, and the core is grounded through the shield case. Electrical connection is realized via a holder and a contact piece. Therefore, in order to obtain stable and sufficiently low grounding resistance of this core,
It is necessary to achieve perfect contact at three locations: the core and the holder, the holder and the contact piece, and the contact piece and the shield case.
(ハ) 発明が解決しようとする問題点
然し乍ら、実際にはシールドケース内に充填さ
れる内部固定用の樹脂として電気絶縁性の高い材
料を使用し、またその充填過程で樹脂内部に気泡
を含まないように真空脱泡を実施するために、硬
化前の液体状の樹脂が微小なシールドケース内部
の隙間にも確実に浸透し、前述した各接触個所に
まで絶縁性の高い皮膜が生じてしまい、信頼性の
高い接地抵抗を確保するのは事実上不可能に近く
なつていた。(c) Problems to be solved by the invention However, in reality, a highly electrically insulating material is used as the internal fixing resin filled into the shield case, and the filling process may contain air bubbles inside the resin. In order to carry out vacuum defoaming to prevent this, the uncured liquid resin will surely penetrate into the minute gaps inside the shield case, creating a highly insulating film at each of the contact points mentioned above. , it was becoming virtually impossible to ensure reliable grounding resistance.
(ニ) 問題点を解決するための手段
本発明は上記した問題点を解決するために、シ
ールドケース内にコアーをその作動ギヤツプ部が
磁気媒体との摺動面側に露出するよう収納した
後、このシールドケース内に内部固定用の絶縁性
樹脂を充填してなる磁気ヘツドにおいて、前記シ
ールドケース内の作動ギヤツプ部近傍のコアー先
端部には前記した内部固定用の絶縁性樹脂に代え
て導電性接着剤を充填し、この導電性接着剤によ
りコアーとシールドケースとを電気的並びに機械
的に接合するようにしたものであります。(d) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a method in which the core is housed in a shield case so that its working gap is exposed on the sliding surface side with the magnetic medium. In this magnetic head in which the shield case is filled with an insulating resin for internal fixation, the tip of the core near the operating gap in the shield case is filled with a conductive resin instead of the insulating resin for internal fixation. This conductive adhesive is used to electrically and mechanically connect the core and shield case.
(ホ) 作用
上記した本発明の磁気ヘツドでは、コアーをシ
ールドケース内に固定すると同時にこのコアーと
シールドケースとの電気的な接続を確実に為すこ
とが出来るので、磁気媒体との摺動摩擦によつて
生じるコアー先端部の静電気を確実に逃すことが
出来る。(E) Effect In the magnetic head of the present invention described above, the core can be fixed in the shield case and at the same time the electrical connection between the core and the shield case can be established reliably. The static electricity generated at the tip of the core can be reliably dissipated.
(ヘ) 実施例
以下、本発明の一実施例について図面と共に説
明する。尚、従来例と同一構成要素については同
一符号を附すと共にその説明を省略する。(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings. Note that the same components as those in the conventional example are given the same reference numerals, and the explanation thereof will be omitted.
即ち、本発明に依れば第４図に示す如く前記シ
ールドケース１内の作動ギヤツプ部２′近傍のコ
アー２ａ，２ｂ先端部には前記した内部固定用の
絶縁性樹脂６に代えて導電性接着剤を充填し、こ
の導電性接着剤によりコアー２ａ，２ｂとシール
ドケース１とを電気的並びに機械的に接合するよ
うにしたものである。ここで、図においては明示
されていないが、導電性接着剤の充填時シールド
ケース１とホルダー４間にもこの接着剤が浸透し
て両者の接合を確実にすることが出来るので、接
触片５の省略が可能となつた。尚、図中７は前記
導電性接着剤の接着層を示すものである。 That is, according to the present invention, as shown in FIG. 4, the tips of the cores 2a and 2b near the operating gap portion 2' in the shield case 1 are made of conductive material instead of the insulating resin 6 for internal fixation. The conductive adhesive is filled with an adhesive, and the cores 2a, 2b and the shield case 1 are connected electrically and mechanically. Here, although it is not clearly shown in the figure, when the conductive adhesive is filled, this adhesive also permeates between the shield case 1 and the holder 4 to ensure the bonding between the two, so the contact piece 5 It became possible to omit . Note that 7 in the figure indicates the adhesive layer of the conductive adhesive.
ここで、本発明に用いられる導電性接着剤とし
ては、各種カーボン粉体の中から或る一定の特性
を有するものを選定し且つその特定粉体を所定の
重量比でエポキシ系樹脂に分散させることによつ
て得た。即ち、第２図は分散媒体としてエポキシ
系樹脂を使用した場合におけるカーボン粉体の混
合比率（重量％）と導電率（Ω-1・cm-1）の実験
結果の一例を示したものである。図中特性ａ，ｂ
は、第３図に示した各種特性項目について夫々図
示の如き特性を有する試料Ａ，Ｂに対応するもの
である。尚、各種特性項目のうち粒径及びPH値は
分散媒体であるエポキシ系樹脂へのカーボン粉体
の分散性の難易が判断可能であるし、表面積及び
吸油量は粉体の微粒子としてのストラクチヤーを
推定出来る。ところで、上記した本発明の磁気ヘ
ツドに必要な導電性接着剤として、その導電率は
実用上１Ω-1・cm-1程度得られればコアー２ａ，
２ｂの接地抵抗を十分低く出来ることが確認出来
た。故に、第２図に示した分散実験より特性ａに
示した特性を呈する試料Ａのカーボン粉体を使用
し且つその混合比率（重量比）を30％以上分散限
界に至る範囲に設定することによつて上述の導電
率を得られることが判明した。尚、分散限界は重
量比にして40数％程度からカーボン粉体の凝固が
認められるので明らかに50％以下である。 Here, as the conductive adhesive used in the present invention, one having certain characteristics is selected from various types of carbon powder, and the specific powder is dispersed in an epoxy resin at a predetermined weight ratio. I got it by doing this. That is, Figure 2 shows an example of the experimental results of the mixing ratio (wt%) of carbon powder and electrical conductivity (Ω -1 cm -1 ) when epoxy resin is used as a dispersion medium. . Characteristics a and b in the figure
These correspond to samples A and B having the characteristics shown in FIG. 3 with respect to the various characteristic items shown in FIG. Among various characteristic items, the particle size and PH value can be used to determine the difficulty of dispersing carbon powder into the epoxy resin that is the dispersion medium, and the surface area and oil absorption amount can be used to determine the structure of the powder as fine particles. It can be estimated. By the way, if the conductive adhesive necessary for the above-mentioned magnetic head of the present invention has a conductivity of about 1 Ω -1 cm -1 in practical use, then the core 2a,
It was confirmed that the grounding resistance of 2b could be made sufficiently low. Therefore, from the dispersion experiment shown in Figure 2, we decided to use the carbon powder of sample A exhibiting the characteristics shown in characteristic a, and set the mixing ratio (weight ratio) to a range of 30% or more to reach the dispersion limit. Therefore, it was found that the above-mentioned conductivity could be obtained. Incidentally, the dispersion limit is clearly 50% or less, since solidification of carbon powder is observed from about 40% by weight.
(ト) 発明の効果
上述した如く本発明磁気ヘツドに依れば、内部
固定用の絶縁性樹脂に代えてシールドケース内の
作動ギヤツプ部近傍のコアー先端部に充填される
導電性接着剤により、コアーをシールドケース内
に固定すると同時にこのコアーとシールドケース
との電気的な接続を確実に為すことが出来るの
で、磁気媒体との摺動摩擦によつて生じるコアー
先端部での静電気を確実に逃すことが出来る。(G) Effects of the Invention As described above, according to the magnetic head of the present invention, instead of the insulating resin for internal fixation, the conductive adhesive filled in the tip of the core near the operating gap in the shield case, Since the core can be securely connected to the shield case at the same time as the core is fixed in the shield case, static electricity generated at the tip of the core due to sliding friction with the magnetic medium can be reliably dissipated. I can do it.
第１図は従来の磁気ヘツドを示し、同図イはそ
の概略内部構成図、同図ロはその正面図、第２図
は２種のカーボン粉体の混合比対導電率特性図、
第３図は２種のカーボン粉体の各種特性項目表、
第４図は本発明に係る磁気ヘツドを示し、同図イ
はその概略内部構成図、同図ロはその正面図であ
る。
１…シールドケース、２ａ，２ｂ…コアー、
２′…作動ギヤツプ部、７…導電性接着剤層。
Fig. 1 shows a conventional magnetic head, Fig. 1A shows its schematic internal configuration, Fig. 2B shows its front view, Fig. 2 shows the mixing ratio versus conductivity characteristic of two types of carbon powder,
Figure 3 is a table of various characteristics of two types of carbon powder,
FIG. 4 shows a magnetic head according to the present invention, and FIG. 4A is a schematic internal configuration diagram thereof, and FIG. 4B is a front view thereof. 1... Shield case, 2a, 2b... Core,
2'... Operating gap portion, 7... Conductive adhesive layer.
Claims (1)
プ部が磁気媒体との摺動面側に露出するよう収納
した後、このシールドケース内に内部固定用の絶
縁性樹脂を充填してなる磁気ヘツドにおいて、前
記シールドケース内の作動ギヤツプ部近傍のコア
ー先端部には前記した内部固定用の絶縁性樹脂に
代えて導電性接着剤を充填し、この導電性接着剤
によりコアーとシールドケースとを電気的並びに
機械的に接合するようにした事を特徴とする磁気
ヘツド。1. In a magnetic head in which the core is housed in a shield case so that its operating gap portion is exposed on the sliding surface side with the magnetic medium, the shield case is filled with an insulating resin for internal fixation. The tip of the core near the operating gap inside the shield case is filled with a conductive adhesive instead of the insulating resin for internal fixation, and this conductive adhesive connects the core and the shield case electrically and mechanically. A magnetic head that is characterized by a magnetic head that is bonded to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14672275A JPS5269607A (en) | 1975-12-08 | 1975-12-08 | Conductive bonding agent and magnetic head using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14672275A JPS5269607A (en) | 1975-12-08 | 1975-12-08 | Conductive bonding agent and magnetic head using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5269607A JPS5269607A (en) | 1977-06-09 |
| JPS6249643B2 true JPS6249643B2 (en) | 1987-10-20 |
Family
ID=15414065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14672275A Granted JPS5269607A (en) | 1975-12-08 | 1975-12-08 | Conductive bonding agent and magnetic head using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5269607A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5611616A (en) * | 1979-07-06 | 1981-02-05 | Mitsubishi Electric Corp | Magnetic head |
| JPS6241377Y2 (en) * | 1979-10-27 | 1987-10-23 | ||
| JPS5849322U (en) * | 1981-09-29 | 1983-04-02 | キヤノン電子株式会社 | magnetic head |
| JPS5959769A (en) * | 1982-09-29 | 1984-04-05 | Meisei Chiyaachiru Kk | Structural adhesive |
-
1975
- 1975-12-08 JP JP14672275A patent/JPS5269607A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5269607A (en) | 1977-06-09 |
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