JPH02183407A - Magnetic head and its manufacture - Google Patents
Magnetic head and its manufactureInfo
- Publication number
- JPH02183407A JPH02183407A JP1003157A JP315789A JPH02183407A JP H02183407 A JPH02183407 A JP H02183407A JP 1003157 A JP1003157 A JP 1003157A JP 315789 A JP315789 A JP 315789A JP H02183407 A JPH02183407 A JP H02183407A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic material
- head
- alloy
- permeability ferrite
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000000956 alloy Substances 0.000 claims abstract description 33
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 31
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 23
- 239000000696 magnetic material Substances 0.000 claims abstract description 22
- 230000035699 permeability Effects 0.000 claims abstract description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000001301 oxygen Substances 0.000 claims abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910000702 sendust Inorganic materials 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims 2
- 238000005299 abrasion Methods 0.000 abstract 1
- 239000011162 core material Substances 0.000 description 6
- 235000019592 roughness Nutrition 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910001020 Au alloy Inorganic materials 0.000 description 1
- RZJQYRCNDBMIAG-UHFFFAOYSA-N [Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Zn].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn] Chemical class [Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Zn].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn] RZJQYRCNDBMIAG-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003353 gold alloy Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は磁気ヘッドおよびその製造方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a magnetic head and a method of manufacturing the same.
従来の技術
従来より磁気ヘッド用コア材として、加工性、耐摩耗性
が良いという特長からフェライトが広く使用されている
が、飽和磁束密度Ｂｓが合金材料に比べて３０〜５０％
低い。従って、近年登場してきた高抗磁力の高密度記録
媒体に使用した場合、ヘッドコア材料の磁気飽和が問題
となり、このような観点から、高密度記録媒体の対応ヘ
ッドとして、センダストや非晶質の合金材料をヘッドギ
ャップ近傍に配したいわゆるメタルインギャップヘッド
が実用に供されている。Conventional technology Ferrite has been widely used as a core material for magnetic heads due to its good workability and wear resistance, but its saturation magnetic flux density Bs is 30 to 50% that of alloy materials.
low. Therefore, when used in high-density recording media with high coercive force that have appeared in recent years, magnetic saturation of the head core material becomes a problem. A so-called metal-in-gap head in which a material is placed near the head gap is in practical use.
このヘッドの一般的なテープ摺動面には問題がある。す
なわち、このヘッドを長時間、例えば１００時閏以上走
行させるとヘッド出力が低下する。There are problems with the typical tape sliding surface of this head. That is, when this head is run for a long time, for example, over 100 hours, the head output decreases.
出力の低下はヘッドのテープ摺動画の部分のフェライト
と合金材料の間に数百オングストローム段差、いわゆる
偏摩耗が発生しており、スペーシングロスによる出力低
下を生じている。The decrease in output is due to a step of several hundred angstroms, so-called uneven wear, occurring between the ferrite and alloy material in the tape sliding area of the head, resulting in a decrease in output due to spacing loss.
又、裏通（ｉｌｌラフエライト合金磁性材との界面によ
る疑似ギャップノイズが非常に大きくその改善が望まれ
ている。In addition, the pseudo gap noise caused by the interface with the rough ferrite alloy magnetic material is very large, and its improvement is desired.
発明が解決しようとする課題
本発明の目的は、メタルインギャップヘッドに於て、長
時間テープ走行により偏摩耗が発生し、その結果スペー
シングロスによりヘッド出力が低下するのを防止するこ
とである。更に疑似ギャップノイズを低減することであ
る。Problems to be Solved by the Invention An object of the present invention is to prevent uneven wear that occurs in a metal-in-gap head due to long-time tape running, and as a result, a decrease in head output due to spacing loss. . Furthermore, the purpose is to reduce pseudo gap noise.
課題を解決するための手段
高透磁率フェライトと合金磁性材とで磁気コアを構成し
、かつ前記合金磁性材をヘッドギャップ近傍に配すると
ともに、前記高透磁率フェライトと合金磁性材との界面
に平均粗度０．１２μｍ以上の凹凸を存在させる。Means for Solving the Problems A magnetic core is constituted by a high magnetic permeability ferrite and an alloy magnetic material, and the alloy magnetic material is arranged near the head gap, and at the interface between the high magnetic permeability ferrite and the alloy magnetic material. Provide unevenness with an average roughness of 0.12 μm or more.
また、高透磁率フェライトとセンダスト合金磁性材で磁
気コアを構成した磁気ヘッドの製造方法において、当該
両材料界面となる前記高透磁率フェライト表面に平均粗
度０．１２μｍ以上の凹凸を形成し、その上に前記セン
ダスト合金磁性材の層を形成しヘッドギャップ近傍に配
するとともに、その製造工程中で、８００℃以上１００
０℃以下の温度で不純物ガスとして酸素を含む雰囲気中
で熱処理する。Further, in a method of manufacturing a magnetic head in which a magnetic core is made of a high magnetic permeability ferrite and a Sendust alloy magnetic material, an unevenness having an average roughness of 0.12 μm or more is formed on the high magnetic permeability ferrite surface that is an interface between the two materials, On top of that, a layer of the Sendust alloy magnetic material is formed and placed near the head gap.
Heat treatment is performed at a temperature of 0° C. or lower in an atmosphere containing oxygen as an impurity gas.
作用
界面での凹凸によって、疑似ギャップノイズが大幅に改
善される。The roughness at the working interface significantly improves pseudogap noise.
また、上記製造方法によれば、熱処理によりセンダスト
合金磁性材の結晶粒界付近に高い酸素濃度の相が形成さ
れ、母相の合金磁性材より耐摩耗性が向上する結果、フ
ェライトとセンダスト合金磁性材の偏摩耗がを改善され
る。In addition, according to the above manufacturing method, a phase with a high oxygen concentration is formed near the grain boundaries of the sendust alloy magnetic material by heat treatment, and as a result, the wear resistance is improved compared to the parent phase alloy magnetic material. Uneven wear of materials is improved.
実施例１
フェライト材料を基板とし、その表面を種々の粗さのダ
イアモンドカップで研削した。これらの表面の平均面粗
さは０．Ｏ１以下、０．０６．０゜０９．０．１２．０
．１８．０．２３μｔｎであった。この上に、センダス
ト合金（Ｆｅ、Ｓｉ、ＡＩ金合金をターゲットとして、
真空槽内を約５Ｘ１０−’Ｔ。Example 1 A ferrite material was used as a substrate, and its surface was ground with diamond cups having various roughnesses. The average surface roughness of these surfaces is 0. O1 or less, 0.06.0°09.0.12.0
．． It was 18.0.23 μtn. On top of this, targeting Sendust alloy (Fe, Si, AI gold alloy),
Approximately 5X10-'T inside the vacuum chamber.
ｒｒに排気した後、Ａｒガスを導入して１．５Ｘ１０−
’Ｔｏｒｒを保持しつつ、センダスト合金膜をスパッタ
蒸着した０次にノツチ加工した後８００℃〜１０００℃
の温度で５０〜２００ｐρ霧の微量の酸素を含有する窒
素中で２０時以上理した０次にノツチにガラスを充填し
巻線窓を加工した後、ギャップ突合せ面をダイヤモンド
ペーストで鏡面に加工した。次に、この面にギャップス
ペーサ材を所定の厚みにスパッタして、ギャップ形成用
の片側コアを完成した。After exhausting to rr, Ar gas was introduced to 1.5X10-
'While maintaining Torr, sendust alloy film is sputter-deposited and 0-order notch processed at 800℃~1000℃.
It was heated for more than 20 hours in nitrogen containing a trace amount of oxygen with a mist of 50 to 200 ppr at a temperature of . Next, a gap spacer material was sputtered to a predetermined thickness on this surface to complete a one-sided core for forming a gap.
こうして完成したコアを突合せてギャップ形成を行なっ
た。この一対のバーより切断線に沿って切り出し、ヘッ
ドを完成した。The cores thus completed were butted together to form a gap. The head was completed by cutting out the pair of bars along the cutting line.
こうして完成したヘッドをＶＴＲデツキに取り付はテー
プを走行させた。２００時閏以上ヘッド出力、及びフェ
ライトとセンダスト合金の偏摩耗の測定、さらには疑似
ギャップノイズを測定した結果を第１．２表に示す、な
お、ヘッド出力はテープ走行直後のヘッド出力をＯｄＢ
とする。The thus completed head was attached to a VTR deck and the tape was run. Table 1.2 shows the results of measuring head output over 200 hours, uneven wear of ferrite and Sendust alloy, and pseudo gap noise.Head output is OdB of head output immediately after tape running.
shall be.
第 １ 表
（最短記録波長０．５１ｚｍ）
第 ２ 表 μｍ ／ ｄ Ｂ上記の表か
ら、面の平均粗度が０．１２μｍあれば、いわゆるＤＡ
Ｔに使用できるノイズレベル２２ｄＢが得られることが
わかる。さらに０． ２μｍではビデオヘッドに用い得
る３０ｄＢに達しており、優れた特性を示している。さ
らに、同時に部分酸化処理を施すことによって、偏摩耗
も大幅に改善されている。Table 1 (Shortest recording wavelength 0.51zm) Table 2 μm/dB From the above table, if the average roughness of the surface is 0.12μm, the so-called DA
It can be seen that a noise level of 22 dB that can be used for T is obtained. Another 0. At 2 μm, it reaches 30 dB, which can be used in video heads, showing excellent characteristics. Furthermore, by simultaneously performing partial oxidation treatment, uneven wear has been significantly improved.
本発明で、熱処理温度を８００℃〜１０００℃と限定し
たのは、８００℃以下ではセンダスト合金の耐摩耗が十
分でなく偏摩耗が発生し、また１０００℃以上ではセン
ダスト合金自身の結晶粒が大きくなって磁気特性が損な
われたり、またセンダスト合金とフェライト間の相互拡
散がおこり、磁気特性が劣化するためである。以上を考
慮すれば９００℃付近が最適である。In the present invention, the heat treatment temperature is limited to 800°C to 1000°C because at temperatures below 800°C, the wear resistance of the sendust alloy is insufficient and uneven wear occurs, and at temperatures above 1000°C, the crystal grains of the sendust alloy itself become large. This is because the magnetic properties are deteriorated due to mutual diffusion between the sendust alloy and the ferrite, and the magnetic properties are deteriorated. Considering the above, a temperature around 900°C is optimal.
酸素濃度については、本発明では５０〜２００ｐｐ献こ
ついて述べたが、１ ｐｐｍ〜５００ ｐｐＩｌｌの範
囲であればよい。１ ｐｐｍ以下では酸素の拡散が十分
に行なわれず、５００ ｐｐｍ以上では表面酸化が起こ
り好ましくない。Regarding the oxygen concentration, although 50 to 200 ppm has been described in the present invention, it may be in the range of 1 ppm to 500 ppIll. If it is less than 1 ppm, oxygen will not diffuse sufficiently, and if it is more than 500 ppm, surface oxidation will occur, which is not preferable.
又、上記濃度の酸素を含む雰囲気であれば、窒素、アル
ゴン、水素、真空等適宜選択すれば良い。Further, as long as the atmosphere contains oxygen at the above concentration, nitrogen, argon, hydrogen, vacuum, etc. may be selected as appropriate.
なお、センダスト合金組成は、Ｆｅ−５ｉ−ＡＩ！成で
あれば磁性を損なわない範囲でいずれも効果がある。In addition, the sendust alloy composition is Fe-5i-AI! Any of these is effective as long as it does not impair magnetism.
又耐摩耗性の良好な部分は、例えばせいぜい１００ミク
ロン程度であるので本発明の様にセンダスト合金磁性材
をヘッドギャップ近傍に配してなる磁気ヘッドに於いて
は、研磨量を考慮してもセンダスト合金部分の厚みは１
００ミクロン以下となるので、全てのセンダスト合金部
の耐摩耗性が良好である。従って熱処理の時期は基本的
にはいっでもよいが、熱処理によるガラスとの反応やゆ
るみを考慮して本願実施例のようにノツチ加工後行なう
のが望ましい。In addition, since the area with good wear resistance is, for example, about 100 microns at most, in a magnetic head in which a sendust alloy magnetic material is arranged near the head gap as in the present invention, even when considering the amount of polishing, The thickness of the sendust alloy part is 1
00 microns or less, the wear resistance of all sendust alloy parts is good. Therefore, the heat treatment can basically be carried out at any time, but in consideration of the reaction with the glass and the loosening caused by the heat treatment, it is preferable to carry out the heat treatment after notching as in the embodiment of the present application.
なお、本発明のヘッドのセンダスト合金部を分析した所
、特に結晶粒界付近に高い酸素濃度の相が、存在する事
が分かった。An analysis of the sendust alloy part of the head of the present invention revealed that a phase with a high oxygen concentration was present particularly near the grain boundaries.
実施例２
上記の例において高透磁率フェライト焼結体材料に多結
晶体を用いた。その平均粒径は各々約１．３．５．８．
１２μｍであった。研削後、熱燐酸にてエツチングを行
なったところ、その粒径に応じた凹凸が生じていた。そ
の粗度は各々０．１６／１． ０． ４２／３＝０．
１４／１． ０． ６１５＝０． １２／１．０．８１
／８＝０．１０／Ｌ１．１／１２＝０．９２／ｌになっ
ていた。ここで上段は面粗度μｍ、下段は平均粒径μｍ
である。Example 2 In the above example, a polycrystalline body was used as the high magnetic permeability ferrite sintered body material. The average particle size is approximately 1.3.5.8.
It was 12 μm. After grinding, etching was performed using hot phosphoric acid, and as a result, unevenness was generated depending on the particle size. The roughness is 0.16/1. 0. 42/3=0.
14/1. 0. 615=0. 12/1.0.81
/8=0.10/L1.1/12=0.92/l. Here, the upper row is the surface roughness μm, and the lower row is the average grain size μm.
It is.
ノイズを測定したところ、０．１２μｍ以上の面粗度以
上ではやはり２０ｄＢ以上のＳ／Ｎが得られ、良好な結
果を示していた。When noise was measured, a S/N of 20 dB or more was obtained for surface roughness of 0.12 μm or more, indicating a good result.
発明の効果
本発明によれば、フェライトと合金磁性材の界面に０．
１２μｍ以上の凹凸を形成しておくことで疑似ギャップ
ノイズがも大幅に改善される。Effects of the Invention According to the present invention, the interface between the ferrite and the alloy magnetic material has 0.
By forming irregularities of 12 μm or more, pseudo gap noise is also significantly improved.
また、製造工程中で、８００℃以上１０００℃以下の温
度で不純物ガスとして酸素を含む雰囲気中で熱処理する
ことにより、合金磁性材の耐摩耗性が改善されるので、
テープ走行によるフェライトと合金磁性材料間の偏摩耗
がほとんど発生せず、その結果ヘッド出力低下がなく安
定したヘッド出力が得られる。In addition, the wear resistance of the alloy magnetic material is improved by heat-treating it in an atmosphere containing oxygen as an impurity gas at a temperature of 800°C or higher and 1000°C or lower during the manufacturing process.
There is almost no uneven wear between the ferrite and the alloy magnetic material due to tape running, and as a result, stable head output is obtained without any drop in head output.
Claims (6)
構成し、かつ前記合金磁性材をヘッドギャップ近傍に配
するとともに、前記高透磁率フェライトと合金磁性材と
の界面に平均粗度０．１２μｍ以上の凹凸を存在させた
ことを特徴とする磁気ヘッド。(1) A magnetic core is constituted by a high magnetic permeability ferrite and an alloy magnetic material, and the alloy magnetic material is arranged near the head gap, and the interface between the high magnetic permeability ferrite and the alloy magnetic material has an average roughness of 0. . A magnetic head characterized by the presence of irregularities of 12 μm or more.
存在する事を特徴とする請求項１記載の磁気ヘッド。(2) The magnetic head according to claim 1, characterized in that a phase with a high oxygen concentration exists near the grain boundaries of the alloy magnetic material.
体で構成されている事を特徴とする請求項１または２記
載の磁気ヘッド。(3) The magnetic head according to claim 1 or 2, wherein the high magnetic permeability ferrite is composed of a sintered body having an average grain size of 5 μm or less.
気コアを構成した磁気ヘッドの製造方法であって、当該
両材料界面となる前記高透磁率フェライト表面に平均粗
度０．１２μｍ以上の凹凸を形成し、その上に前記セン
ダスト合金磁性材の層を形成しヘッドギャップ近傍に配
するとともに、その製造工程中で、８００℃以上１００
０℃以下の温度で不純物ガスとして酸素を含む雰囲気中
で熱処理する事を特徴とする磁気ヘッドの製造方法。(4) A method for manufacturing a magnetic head in which a magnetic core is made of high magnetic permeability ferrite and Sendust alloy magnetic material, wherein the surface of the high magnetic permeability ferrite, which forms the interface between the two materials, is roughened with an average roughness of 0.12 μm or more. A layer of the Sendust alloy magnetic material is formed thereon and placed in the vicinity of the head gap, and during the manufacturing process, the temperature is
A method for manufacturing a magnetic head, characterized by heat treatment in an atmosphere containing oxygen as an impurity gas at a temperature of 0° C. or lower.
体で構成する事を特徴とする請求項４記載の磁気ヘッド
の製造方法。(5) The method of manufacturing a magnetic head according to claim 4, wherein the high magnetic permeability ferrite is made of a sintered body having an average grain size of 5 μm or less.
ングを施し、界面に凹凸を形成する事を特徴とする請求
項４または５記載の磁気ヘッドの製造方法。(6) The method of manufacturing a magnetic head according to claim 4 or 5, wherein the high magnetic permeability ferrite is ground or chemically etched to form irregularities at the interface.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1003157A JPH0827907B2 (en) | 1989-01-10 | 1989-01-10 | Porcelain head and method of manufacturing the same |
| EP90100357A EP0378160B1 (en) | 1989-01-10 | 1990-01-09 | Magnetic head and method of producing the same |
| DE69014210T DE69014210T2 (en) | 1989-01-10 | 1990-01-09 | Magnetic head and manufacturing process. |
| KR1019900000232A KR930002479B1 (en) | 1989-01-10 | 1990-01-10 | Magnetic head and method of producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1003157A JPH0827907B2 (en) | 1989-01-10 | 1989-01-10 | Porcelain head and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02183407A true JPH02183407A (en) | 1990-07-18 |
| JPH0827907B2 JPH0827907B2 (en) | 1996-03-21 |
Family
ID=11549516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1003157A Expired - Fee Related JPH0827907B2 (en) | 1989-01-10 | 1989-01-10 | Porcelain head and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0827907B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5583728A (en) * | 1994-02-04 | 1996-12-10 | Japan Energy Corporation | Improved magnetic head having smoothed chamfered surface for reducing magnetic scattering |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62102409A (en) * | 1985-10-30 | 1987-05-12 | Canon Inc | Magnetic head core |
| JPS6371908A (en) * | 1986-09-15 | 1988-04-01 | Tdk Corp | Composite type magnetic head for picture recording and reproducing |
| JPS63108510A (en) * | 1986-10-27 | 1988-05-13 | Nec Kansai Ltd | Magnetic head |
| JPS63311611A (en) * | 1987-06-12 | 1988-12-20 | Sumitomo Special Metals Co Ltd | Composite type magnetic head |
-
1989
- 1989-01-10 JP JP1003157A patent/JPH0827907B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62102409A (en) * | 1985-10-30 | 1987-05-12 | Canon Inc | Magnetic head core |
| JPS6371908A (en) * | 1986-09-15 | 1988-04-01 | Tdk Corp | Composite type magnetic head for picture recording and reproducing |
| JPS63108510A (en) * | 1986-10-27 | 1988-05-13 | Nec Kansai Ltd | Magnetic head |
| JPS63311611A (en) * | 1987-06-12 | 1988-12-20 | Sumitomo Special Metals Co Ltd | Composite type magnetic head |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5583728A (en) * | 1994-02-04 | 1996-12-10 | Japan Energy Corporation | Improved magnetic head having smoothed chamfered surface for reducing magnetic scattering |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0827907B2 (en) | 1996-03-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |