JPS63121111A - Manufacture of permanent magnet type erasing head - Google Patents
Manufacture of permanent magnet type erasing headInfo
- Publication number
- JPS63121111A JPS63121111A JP26595986A JP26595986A JPS63121111A JP S63121111 A JPS63121111 A JP S63121111A JP 26595986 A JP26595986 A JP 26595986A JP 26595986 A JP26595986 A JP 26595986A JP S63121111 A JPS63121111 A JP S63121111A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- tape sliding
- permanent magnet
- sliding surface
- erasing 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 229920005989 resin Polymers 0.000 claims abstract description 40
- 239000011347 resin Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims description 14
- 238000000465 moulding Methods 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 2
- 239000006247 magnetic powder Substances 0.000 claims 1
- 230000003746 surface roughness Effects 0.000 claims 1
- 229920001169 thermoplastic Polymers 0.000 claims 1
- 239000004416 thermosoftening plastic Substances 0.000 claims 1
- 238000001746 injection moulding Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 4
- 229920005992 thermoplastic resin Polymers 0.000 abstract description 2
- 239000000696 magnetic material Substances 0.000 description 5
- 238000005498 polishing Methods 0.000 description 2
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は主にオーディオ用のテープ消去に用いられる永
久磁石型消去ヘッドの製造法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a permanent magnet erasing head used primarily for erasing audio tapes.
従来の技術
一般に磁気テープ等の磁気記録媒体を消去する方法とし
て、電流消去法、永久磁石を用いるもの及びそれらを複
合して用いるものがある。従来の永久磁石型消去ヘッド
について添付図面を用いて説明する。第６図は永久磁石
型消去ヘッドの構造を示し、第６図ａ、ｂは消去原理を
示す。同図面に示すように、消去ヘッドケース本体１７
に切断加工によって得られた磁性材料１Ｂを挿入・接着
した後、テープとの密着性・摺動性を良くするため、Ｒ
形状に研磨仕上げをして、テープ摺動面１９を形成して
いた。テープ摺動面１９には第６図ａで示すようにテー
プ走行方向に）１４８−＋Ｎ・・・と交番し、且つその
磁界強度は同図面すのように漸減していく漸減交番型の
着磁を行いテープに記録・着磁されたデータを磁界強度
がゼロになる点まで誘導し消去を行うという原理である
。2. Description of the Related Art In general, methods for erasing magnetic recording media such as magnetic tapes include current erasing methods, methods using permanent magnets, and methods using a combination of these methods. A conventional permanent magnet erase head will be described with reference to the accompanying drawings. FIG. 6 shows the structure of a permanent magnet type erasing head, and FIGS. 6a and 6b show the erasing principle. As shown in the drawing, the erasing head case body 17
After inserting and adhering the magnetic material 1B obtained by cutting, R
The tape sliding surface 19 was formed by polishing the shape. On the tape sliding surface 19, as shown in FIG. 6a, there are gradually decreasing alternating magnetic fields (148-+N...) in the tape running direction, and the magnetic field strength gradually decreases as shown in the same figure. The principle is to use magnetism to guide the data recorded and magnetized on the tape to the point where the magnetic field strength becomes zero, and then erase it.
発明が解決しようとする問題点
しかしながら従来の製造方法においては、永久磁石など
の磁性材料１８を所定の寸法に切断した後、ケース本体
１６に挿入・接着させる組立工程を必要とし、年々倍増
するコストダウンの市場要望に対し、組立工程にかかる
コストが大きく問題視されているばかりでなく、磁性材
料１８の寸法ばらつきにより、消去ヘッドのケース本体
１７に磁性材料１８を挿入・接着した時点ですき間が発
生する等、品質面でも大きな問題を有していた。Problems to be Solved by the Invention However, the conventional manufacturing method requires an assembly process in which the magnetic material 18, such as a permanent magnet, is cut into predetermined dimensions and then inserted into the case body 16 and bonded, resulting in costs that double every year. In response to the market demand for down-type products, not only is the cost involved in the assembly process a major issue, but due to dimensional variations in the magnetic material 18, gaps may be created when the magnetic material 18 is inserted and bonded into the case body 17 of the erase head. There were also major problems in terms of quality.
本発明は上記従来例の欠点を解決しコストダウンと品質
改善を可能にする永久磁石型消去ヘッドの製造法を提供
せんとするものである。SUMMARY OF THE INVENTION The present invention aims to provide a method for manufacturing a permanent magnet erasing head which solves the above-mentioned drawbacks of the prior art and makes it possible to reduce costs and improve quality.
問題点を解決するための手段
上記問題点を解決するために本発明は、消去ヘッド本体
及びテープ摺動面の一部を樹脂マグネットを用いて射出
成形し、テープ摺動面の残部を樹脂を用いて射出成形を
することを特徴とし、一般に二色成形法と呼ばれる方法
を消去ヘッドに応用したことを特徴とするものである。Means for Solving the Problems In order to solve the above problems, the present invention involves injection molding the erase head body and part of the tape sliding surface using resin magnets, and molding the remaining part of the tape sliding surface using resin. It is characterized by the fact that injection molding is carried out using the eraser head, and a method generally called two-color molding is applied to the erasing head.
作用
この方法によって樹脂マグネットを用いた永久磁石は本
体とテープ摺動面の一部（着磁処理をして、消去ヘッド
として必要な部分）に、又テープ摺動面の残部（非磁性
部を必要とする部分）に樹脂が充填された構造で一体成
形されるため、後工程が不要になり品質改善とコストダ
ウンを同時に達成することが可能となる。Operation Using this method, a permanent magnet using a resin magnet can be attached to the main body and a part of the tape sliding surface (the part that is magnetized and necessary as an erasing head), and the rest of the tape sliding surface (the non-magnetic part). Since it is integrally molded with a structure in which the necessary parts are filled with resin, post-processing is unnecessary, making it possible to improve quality and reduce costs at the same time.
実施例
以下、本発明の一実施例について第１図、第２図、第３
図及び第４図を用いて説明する。第３図及び第４図は本
発明による永久磁石型消去ヘッドの製造法により得た構
造を示し、第１図及び第２図はその製造方法を示す。第
３図ａは平面図を、同すは正面図を、同Ｃは右側面図を
各々示し、永久磁石型消去ヘッド本体１は取付孔２、取
付用ピン３及びテープ摺動面の一部４（着磁処理をして
消去ヘッドとして必要な部分）を全て樹脂マグネットで
一体成形すると共に、テープ摺動面の残部６（非磁性部
を必要とする部分）に樹脂が充填された構造で一体成形
されている。EXAMPLE Below, FIGS.
This will be explained using FIG. 3 and 4 show a structure obtained by the method of manufacturing a permanent magnet erase head according to the present invention, and FIGS. 1 and 2 show the method of manufacturing the same. FIG. 3A shows a plan view, FIG. 3C shows a front view, and FIG. 3C shows a right side view. 4 (the part that is magnetized and necessary as an erase head) is all integrally molded with resin magnets, and the remaining part 6 of the tape sliding surface (the part that requires a non-magnetic part) is filled with resin. It is integrally molded.
第４図は構造をわかりやすく説明するために、樹脂マグ
ネットからなるヘッド本体１と樹脂部６を分離して示し
たものである。この製造法について、第１図及び第２図
を用いて説明する。第１図ａは成形金型下型の平面図を
、第１図すは成形金型を第１図＆のムーＢ断面で示した
ものである。FIG. 4 shows the head main body 1 made of a resin magnet and the resin part 6 separately in order to clearly explain the structure. This manufacturing method will be explained using FIGS. 1 and 2. FIG. 1A is a plan view of the lower die of the mold, and FIG. 1A is a cross-sectional view of the mold as shown in FIG.
成形金型上型６及び同下型７及び同可動部８よシ構成さ
れる成形金型の空洞部９に外部よシ注入口１０を通して
重量比で８７〜９１％ストロンチウム系フェライトマグ
ネットなどの磁性粉と９〜１３形のポリアミド樹脂、ポ
リアセタール樹脂、ポリプロピレン樹脂、ポリエチレン
樹脂などの熱可塑性樹脂からなる樹脂マグネット１６を
注入する。なお、この図中で示す可動ピン１１は後で説
明する樹脂注入用の孔を形成する目的のものであり、こ
の時点では同図で示すごとく成形金型の可動部８に接す
るところまで挿入されている。第２図は第１図で成形さ
れた樹脂マグネット１６より成る永久磁石型消去ヘッド
の、テープ摺動面の残部（非磁性部を必要とする部分）
に樹脂を注入する工程を示したものであり、第２図ａは
成形金型下型の平面図を第２図すは成形金型の第２図ａ
におけるム′−Ｂ′断面で示したものである。第１図で
樹脂マグネット１６を成形した成形金型上型６に製品を
固定したまま成形金型上型６を用いて、成形金型下型１
２を準備し同図のように構成する。同可動部８はテープ
摺動面まで逃がすと共に、第１図で示した樹脂注入用の
可動ピン１１を逃がした位置に、樹脂注入口１３を設け
、ポリアミド、ポリアセタール、ポリプロピレン、ポリ
エチレンなどの熱可塑性樹脂１６を空洞部１４に注入す
る。これで第３図、第４図に示した永久磁石型消去ヘッ
ドが得られることになる。A magnetic material such as a strontium-based ferrite magnet with a weight ratio of 87 to 91% is passed through the external injection port 10 into the cavity 9 of the mold, which is composed of the upper mold 6, the lower mold 7, and the movable part 8. A resin magnet 16 made of powder and a thermoplastic resin such as a 9-13 type polyamide resin, polyacetal resin, polypropylene resin, or polyethylene resin is injected. Note that the movable pin 11 shown in this figure is for the purpose of forming a hole for resin injection, which will be explained later, and at this point it has been inserted until it contacts the movable part 8 of the molding die, as shown in the figure. ing. Figure 2 shows the remainder of the tape sliding surface (portion requiring a non-magnetic part) of the permanent magnet erasing head made of the resin magnet 16 molded in Figure 1.
Figure 2a shows the process of injecting resin into the mold.
This is a cross section taken along the line M'-B'. As shown in FIG. 1, with the product fixed to the molding mold upper mold 6 in which the resin magnet 16 has been molded, the molding mold upper mold 6 is used to move the molding mold lower mold 1
2 and configure it as shown in the figure. The movable part 8 is extended to the tape sliding surface, and a resin injection port 13 is provided at the position where the movable pin 11 for resin injection shown in FIG. A resin 16 is injected into the cavity 14. This results in the permanent magnet erase head shown in FIGS. 3 and 4.
発明の効果
以上のように本発明では一般に樹脂材料どうしの二色成
形を、樹脂マグネットと樹脂を用いて永久磁石型消去ヘ
ッドを成形したものであり、そのテープ摺動面をみると
、着磁処理をして消去ヘッドとして必要な部分には樹脂
マグネットが充填され、着磁処理されると問題が発生す
るため非磁性部が望まれる部分には樹脂が充填されたも
のを安易に得ることが可能である。従来例のように永久
磁石を複雑な工程を経て加工した後に組立て、研磨加工
することも不要になり、成形品状態でテープ摺動面が完
成されることで研磨作業は不要になる。このように、製
造工程の大幅な削減によるコストダウンが可能なばかり
でなく、永久磁石部を成形金製で成形するため、寸法も
安定し、品質の安定を図ることが可能になり、品質、コ
スト面を含めて直接原価の約４６ｑ６削減が可能など貢
献度の大なるものである。Effects of the Invention As described above, the present invention generally involves two-color molding of resin materials, and a permanent magnet erasing head is molded using a resin magnet and resin. After processing, resin magnets are filled in the areas needed as erase heads, and problems occur when magnetized, so it is not possible to easily obtain resin-filled areas where non-magnetic areas are desired. It is possible. It is no longer necessary to assemble and polish the permanent magnet after processing it through a complicated process as in the conventional example, and the tape sliding surface is completed in the form of a molded product, eliminating the need for polishing. In this way, not only is it possible to reduce costs by significantly reducing the manufacturing process, but since the permanent magnet part is made of molded metal, the dimensions are stable and quality can be stabilized. This is a major contribution, as it can reduce direct costs by approximately 46q6, including costs.
第１図、第２図、第３図及び第４図は本発明の実施例を
示し、第１図ａ、ｂ及び第２図ａ、ｂは本発明による永
久磁石型消去ヘッドの製造法を示す平面図と正面断面図
、第３図ａ、ｂ、ｃは同方法により得た永久磁石型消去
ヘッドの平面図、正面図と右側面図、第４図は分解斜視
図、第６図及び第６図は従来例を示し、第６図は構造を
示す正面図、第６図ａ、ｂは消去原理を示す説明図であ
る。
１・・・・・・永久磁石型消去ヘッド本体、２・・・・
・・取付孔、３・・・・・・取付用ビン、４・・・・・
・テープ摺動面の一部、５・・・・・・残部、６・・・
・・・成形金型上型、７・・・・・・成形金型下型、８
・・・・・・可動部、９・・・・・・空洞部、１０・・
・・・・注入口、１１・・・・・・可動ビン、１２・・
・・・・成形金型下型、１３・・・・・・樹脂注入口、
１４・・・・・・空洞部、１６・・・・・・樹脂マグネ
ット、１６・・・・・・樹脂。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第２図
第３図
（乙しン
ｉ
第４図
°５1, 2, 3 and 4 show embodiments of the invention, and FIGS. FIGS. 3a, b, and c are a plan view, front view, and right side view of a permanent magnet erase head obtained by the same method; FIG. 4 is an exploded perspective view; FIGS. FIG. 6 shows a conventional example, FIG. 6 is a front view showing the structure, and FIGS. 6 a and 6 b are explanatory diagrams showing the erasing principle. 1... Permanent magnet erase head body, 2...
...Mounting hole, 3...Mounting bin, 4...
・Part of the tape sliding surface, 5...Remaining part, 6...
...Molding mold upper mold, 7...Molding mold lower mold, 8
...Movable part, 9...Cavity part, 10...
...Inlet, 11...Movable bottle, 12...
... Molding mold lower mold, 13 ... Resin injection port,
14...Cavity part, 16...Resin magnet, 16...Resin. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 (Otsushin I Figure 4 °5
Claims (2)
樹脂マグネットを用いて射出成形し、前記テープ摺動面
のＲ形状と同一のＲになるようにＲ形状部の外周に樹脂
を射出成形することにより消去ヘッド本体及びテープ摺
動面の一部を樹脂マグネットで、テープ摺動面の残部を
樹脂で構成する永久磁石型消去ヘッドの製造法。(1) Injection mold the erase head main body with an R shape on the tape sliding surface using a resin magnet, and inject resin around the outer periphery of the R shape part so that the radius is the same as the R shape of the tape sliding surface. A method of manufacturing a permanent magnet erasing head in which the erasing head body and part of the tape sliding surface are made of resin magnets, and the rest of the tape sliding surface is made of resin.
粉、９〜１３％樹脂部のものを用い、樹脂材料として熱
可塑性プラスチックを用い、テープ摺動面のＲ形状を最
終完成品の形状、寸法及び面粗度に成形時に仕上げる特
許請求の範囲第１項に記載の永久磁石型消去ヘッドの製
造法。(2) As a resin magnet, a weight ratio of 87 to 91% magnetic powder and 9 to 13% resin is used, thermoplastic is used as the resin material, and the R shape of the tape sliding surface is adjusted to the shape of the final finished product. A method for manufacturing a permanent magnet erase head according to claim 1, wherein the dimensions and surface roughness are finished during molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26595986A JPS63121111A (en) | 1986-11-07 | 1986-11-07 | Manufacture of permanent magnet type erasing head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26595986A JPS63121111A (en) | 1986-11-07 | 1986-11-07 | Manufacture of permanent magnet type erasing head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63121111A true JPS63121111A (en) | 1988-05-25 |
Family
ID=17424433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26595986A Pending JPS63121111A (en) | 1986-11-07 | 1986-11-07 | Manufacture of permanent magnet type erasing head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63121111A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0212609A (en) * | 1988-06-29 | 1990-01-17 | Matsushita Electric Ind Co Ltd | Manufacture of permanent magnet type erasing head |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61137217A (en) * | 1984-12-07 | 1986-06-24 | Matsushita Electric Ind Co Ltd | Production of permanent magnet type erasing head |
| JPS61204817A (en) * | 1985-03-08 | 1986-09-10 | Matsushita Electric Ind Co Ltd | Erasing head consisting of permanent magnet |
-
1986
- 1986-11-07 JP JP26595986A patent/JPS63121111A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61137217A (en) * | 1984-12-07 | 1986-06-24 | Matsushita Electric Ind Co Ltd | Production of permanent magnet type erasing head |
| JPS61204817A (en) * | 1985-03-08 | 1986-09-10 | Matsushita Electric Ind Co Ltd | Erasing head consisting of permanent magnet |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0212609A (en) * | 1988-06-29 | 1990-01-17 | Matsushita Electric Ind Co Ltd | Manufacture of permanent magnet type erasing head |
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