JPH0330202B2 - - Google Patents
Info
- Publication number
- JPH0330202B2 JPH0330202B2 JP58214973A JP21497383A JPH0330202B2 JP H0330202 B2 JPH0330202 B2 JP H0330202B2 JP 58214973 A JP58214973 A JP 58214973A JP 21497383 A JP21497383 A JP 21497383A JP H0330202 B2 JPH0330202 B2 JP H0330202B2
- Authority
- JP
- Japan
- Prior art keywords
- inorganic filler
- plastic
- glass fiber
- case body
- head
- 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 - Lifetime
Links
- 239000011256 inorganic filler Substances 0.000 claims description 14
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 13
- 229920003023 plastic Polymers 0.000 claims description 13
- 239000003365 glass fiber Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 7
- 239000000470 constituent Substances 0.000 claims description 5
- 239000012778 molding material Substances 0.000 description 4
- -1 polybutylene terephthalate Polymers 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/10—Structure or manufacture of housings or shields for heads
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
Description
〈産業上の利用分野〉
本発明はＶ・Ｔ・Ｒ等の音声信号用消去ヘツド
において、消去ヘツドを構成するケース本体と、
ヘツド部のテープ摺接面をプラスチツクス、無機
質フイラー及びガラス繊維等の基本構成材料を成
形材料として一体成形してなる磁気ヘツドに関す
るものである。
〈従来技術〉
従来、磁気ヘツドは第１図に示すように、コイ
ル、フロントコア及びパツクコアからなるヘツド
部１を組込むケース本体２に裏面側から挿入され
るよう嵌合部２ａが形成され、ヘツド部１のフロ
ントコア１ａの先端がケース本体２のテープ摺接
面２ｂに正確に位置決めされるように、ケース本
体２のテープ摺接面２ｂ側にセラミツク或いは無
機質フイラー入り成形材料からなるフロントブロ
ツク３が一体的に埋設されており、ヘツド部１を
組込んで内部モールドを施した後、テープ摺接面
２ｂを所定の円弧状に研磨加工して第２図に示す
ような磁気ヘツドが製造されていた。
しかしながら、上記フロントブロツク３には、
帯電防止剤等が添加されていないので、かなり絶
縁性が高いものであり、磁気テープとテープ摺接
面の摩擦により静電気が発生して、磁気テープの
テープ走行が円滑に行なわれなくなり、延いては
雑音の原因になつていた。特に上記フロントブロ
ツク３の成形材料は絶縁性が高いほど帯電量が多
く、面積抵抗値〔Ω／cm2〕も大きくなり、一定値
以上の帯電量になると放電して雑音を増大させる
欠点があつた。
〈問題点を解決するための手段〉
本発明は、上述した従来の欠点を解決するため
になされたものであり、消去ヘツドケース本体が
テープ摺接面を有しかつプラスチツク、無機質フ
イラー及びガラス繊維の基本構成材料を形成材料
として一体成形して造られており、上記プラスチ
ツクと無機質フイラーとの比が35／65〜１であつ
て、これらの合計重量に対して上記ガラス繊維が
５〜10重量％であることを特徴とする磁気ヘツド
を提供するものである。
プラスチツクと無機質フイラーとの比を35／65
以上とすることによつて、電気抵抗を減じて帯電
量が500V以下にすることができ、比を１以上に
することはプラスチツク量が多くなり、耐摩耗性
が低下して好ましくない。
無機質フイラーの添加は抵抗強度の低下およ
び、場合によつては、該フイラーの入つている所
から粒塊脱落を招くことがあり、ガラス繊維を少
なくとも５重量％添加することでガラス繊維が微
細な網目となつて無機質フイラーを保持して、こ
れらの不利益を回避することが出来る。一方、ガ
ラス繊維を10重量％以上添加すると、ガラス繊維
とプラスチツクとの分散性が悪くなつて、面粗度
が悪くなる。
〈発明の実施例〉
以下、本発明による実施例を第３図ないし第４
図及び実験データを参照して具体的に説明する。
第３図は本発明による磁気ヘツドの斜視図であ
り、１０はテープ摺接面と一体に成形されたケー
ス本体、１１はヘツド部のフロントコア、１２は
ギヤツプ、１３はモールド樹脂である。
上記ケース１０は、基本構成材料がプラスチツ
クス（例えばナイロン、ポリフエニレンサルフア
イド、ポリプチレンテレフタレート、ABS樹脂
等）、無機質フイラー（例えばアルミナ、炭酸カ
ルシウム、石英ガラス等）、ガラス繊維の成形材
料から成り、上記プラスチツク／無機質フイラー
は35／65以上になるようにしたものである（次
頁、表１での試供品No.１およびNo.２）。
その他の例を含めた実施例を表１に示す。
<Industrial Application Field> The present invention is an erasing head for audio signals such as V/T/R, which includes a case body constituting the erasing head;
This invention relates to a magnetic head in which the tape sliding contact surface of the head portion is integrally molded using basic constituent materials such as plastics, inorganic filler, and glass fiber as molding materials. <Prior Art> Conventionally, as shown in FIG. 1, a magnetic head has a fitting part 2a formed so as to be inserted from the back side into a case body 2 into which a head part 1 consisting of a coil, a front core, and a pack core is assembled. A front block 3 made of ceramic or an inorganic filler-containing molding material is provided on the tape sliding surface 2b side of the case body 2 so that the tip of the front core 1a of the section 1 is accurately positioned on the tape sliding surface 2b of the case body 2. is integrally buried, and after the head portion 1 is assembled and an internal mold is applied, the tape sliding surface 2b is polished into a predetermined arc shape to produce a magnetic head as shown in Fig. 2. was. However, in the front block 3,
Since no antistatic agent is added, it has a fairly high insulating property, and static electricity is generated due to friction between the magnetic tape and the tape sliding surface, making it difficult for the magnetic tape to run smoothly. was causing the noise. In particular, the higher the insulating properties of the molding material for the front block 3, the higher the amount of charge, and the larger the sheet resistance value [Ω/cm 2 ].There is a drawback that if the amount of charge exceeds a certain value, it will discharge and increase noise. Ta. <Means for Solving the Problems> The present invention has been made to solve the above-mentioned conventional drawbacks, and the erase head case body has a tape sliding contact surface and is made of plastic, inorganic filler, and glass fiber. It is made by integrally molding the basic constituent materials as forming materials, and the ratio of the plastic to the inorganic filler is 35/65 to 1, and the glass fiber is 5 to 10% by weight based on the total weight of these materials. The present invention provides a magnetic head characterized in that: Ratio of plastic to inorganic filler is 35/65
By setting the above ratio, the electrical resistance can be reduced and the amount of charge can be made 500 V or less, and setting the ratio to 1 or more is not preferable because the amount of plastic increases and the abrasion resistance decreases. Addition of inorganic filler may lead to a decrease in resistance strength and, in some cases, drop-off of granules from the place where the filler is contained. These disadvantages can be avoided by holding the inorganic filler in a mesh. On the other hand, if 10% by weight or more of glass fiber is added, the dispersibility between the glass fiber and plastic becomes poor, resulting in poor surface roughness. <Embodiments of the invention> Examples according to the present invention will be described below with reference to FIGS. 3 to 4.
This will be explained in detail with reference to figures and experimental data. FIG. 3 is a perspective view of a magnetic head according to the present invention, in which 10 is a case body molded integrally with the tape sliding surface, 11 is a front core of the head portion, 12 is a gap, and 13 is a molded resin. The basic constituent materials of the case 10 are plastics (for example, nylon, polyphenylene sulfide, polybutylene terephthalate, ABS resin, etc.), inorganic fillers (for example, alumina, calcium carbonate, quartz glass, etc.), and glass fiber molding materials. The plastic/inorganic filler was made to have a ratio of 35/65 or more (sample No. 1 and No. 2 in Table 1 on the next page). Examples including other examples are shown in Table 1.
【表】
表１から明らかなように、プラスチツク／無機
質フイラーの値が40／60及び35／65では帯電量規
格値500V以下を満足できる組成であることが判
明した。
また、ガラス繊維は成形体の抗折強度を高め
る。
〈作用効果〉
以上説明したように本発明による磁気ヘツド
は、消去ヘツドを構成するケース本体と、ヘツド
部のテープ摺接面とを一体にプラスチツクス、無
機質フイラー及びガラス繊維の基本構成材料で成
形して造り、プラスチツクと無機質フイラーとの
比を35／65〜１にし、ガラス繊維を５〜10重量％
にしてなるものであり、テープ摺接面の帯電量が
少なくなり、磁気テープの走行を円滑にし、雑音
の発生を防止し、消去ヘツドの性能を向上させる
ことができる等の効果を奏する。[Table] As is clear from Table 1, it was found that the plastic/inorganic filler values of 40/60 and 35/65 had compositions that could satisfy the charge amount standard value of 500V or less. Moreover, glass fiber increases the bending strength of the molded article. <Operation and Effect> As explained above, in the magnetic head according to the present invention, the case body constituting the erasing head and the tape sliding surface of the head part are integrally molded from basic constituent materials of plastic, inorganic filler, and glass fiber. The ratio of plastic to inorganic filler is 35/65 to 1, and glass fiber is 5 to 10% by weight.
The amount of charge on the tape sliding surface is reduced, the magnetic tape runs smoothly, noise is prevented, and the performance of the erasing head is improved.
第１図ないし第２図は従来の実施例を示す磁気
ヘツドの分解構成図、及び組立て完成後の斜視
図、第３図は本発明による磁気ヘツドの斜視図で
ある。
１０…ケース本体、１１…ヘツド部、１２…ギ
ヤツプ、１３…モールド樹脂。
1 and 2 are exploded structural views of a magnetic head showing a conventional embodiment and a perspective view after assembly is completed, and FIG. 3 is a perspective view of a magnetic head according to the present invention. DESCRIPTION OF SYMBOLS 10...Case body, 11...Head part, 12...Gap, 13...Mold resin.
Claims (1)
ケース本体がテープ摺接面を有しかつプラスチツ
ク、無機質フイラー及びガラス繊維の基本構成材
料を形成材料として一体成形して造られており、
上記プラスチツクと無機質フイラーとの比が35／
65〜１であつて、これらの合計重量に対して上記
ガラス繊維が５〜10重量％であることを特徴とす
る磁気ヘツド。1. In erasing heads such as VTRs, the erasing head case body has a tape sliding surface and is integrally molded from basic constituent materials of plastic, inorganic filler, and glass fiber,
The ratio of the above plastic to the inorganic filler is 35/
65-1, wherein the glass fibers account for 5-10% by weight based on the total weight of the magnetic head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21497383A JPS60107703A (en) | 1983-11-17 | 1983-11-17 | Magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21497383A JPS60107703A (en) | 1983-11-17 | 1983-11-17 | Magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60107703A JPS60107703A (en) | 1985-06-13 |
| JPH0330202B2 true JPH0330202B2 (en) | 1991-04-26 |
Family
ID=16664612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21497383A Granted JPS60107703A (en) | 1983-11-17 | 1983-11-17 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60107703A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101396955B1 (en) * | 2011-09-30 | 2014-05-19 | 히타치 어플라이언스 가부시키가이샤 | Gear pump and refrigerator having the same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2579628B2 (en) * | 1987-02-27 | 1997-02-05 | キヤノン電子株式会社 | Magnetic head |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4715950U (en) * | 1971-03-24 | 1972-10-24 |
-
1983
- 1983-11-17 JP JP21497383A patent/JPS60107703A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4715950U (en) * | 1971-03-24 | 1972-10-24 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101396955B1 (en) * | 2011-09-30 | 2014-05-19 | 히타치 어플라이언스 가부시키가이샤 | Gear pump and refrigerator having the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60107703A (en) | 1985-06-13 |
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