JPH05266417A - Combined magnetic head - Google Patents
Combined magnetic headInfo
- Publication number
- JPH05266417A JPH05266417A JP9485392A JP9485392A JPH05266417A JP H05266417 A JPH05266417 A JP H05266417A JP 9485392 A JP9485392 A JP 9485392A JP 9485392 A JP9485392 A JP 9485392A JP H05266417 A JPH05266417 A JP H05266417A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- weight
- magnetic head
- thin film
- magnetic
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ＶＴＲ等に好適に使用
される複合磁気ヘッドに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite magnetic head suitable for use in a VTR or the like.
【０００２】[0002]
【従来の技術】ＶＴＲ等に使用される複合磁気ヘッドは
ギャップ幅規制溝を形成したＭｎ−Ｚｎフェライト等の
磁気材料から成るコアのギャップにＦｅ−Ｓｉ−Ｇａ−
Ｒｕ合金等の合金磁性薄膜を形成した磁気コア半体の相
互の合金磁性薄膜同士を対向させて融着ガラスによって
融着一体化して構成させている。従来、この構造の複合
磁気ヘッドにおいては、ギャップ形成面にギャップスペ
ーサーおよび保護膜のＳｉＯ2 膜を介してＰｂＯ ７０
重量％、ＳｉＯ2 ２０重量％、Ｂ2 Ｏ3 １０重量％
程度の融着ガラスが使用されていた。更に、この融着ガ
ラスを用いた場合、金属磁性薄膜を構成する金属が保護
膜であるＳｉＯ2 膜を通って融着ガラス中に拡散して当
該部からひび割れが生ずる欠陥があった。そこで、この
融着ガラスをＰｂＯ ４０〜６２重量％、ＳｉＯ2 １
１〜２５重量％、Ｂ2 Ｏ3 ５〜９重量％、Ｂｉ2 Ｏ3
４〜９重量％、Ｎａ2 Ｏ ０〜１１重量％、Ｆｅ2 Ｏ
3 及びＺｎＯの合計１０〜１８重量％よりなる組成のガ
ラスを用いて磁気コア半体を融着せしめたところ融着ガ
ラスによる金属磁性薄膜への拡散を抑制し、ひび割れを
防止する技術も特開平１−２８２４８号公報に開示され
ている。2. Description of the Related Art In a composite magnetic head used for a VTR or the like, Fe-Si-Ga- is formed in a gap of a core made of a magnetic material such as Mn-Zn ferrite in which a gap width regulating groove is formed.
The magnetic alloy halves of the magnetic core halves on which alloy magnetic thin films such as Ru alloy are formed are made to face each other and are fused and integrated by a fused glass. Conventionally, in a composite magnetic head having this structure, PbO 70 is formed on the gap forming surface via a gap spacer and a SiO 2 film as a protective film.
% By weight, SiO 2 20% by weight, B 2 O 3 10% by weight
Some fused glass was used. Further, when this fused glass was used, there was a defect that the metal constituting the metal magnetic thin film diffused into the fused glass through the SiO 2 film as the protective film and cracked from this portion. Therefore, this fused glass is mixed with PbO 40 to 62% by weight and SiO 2 1
1 to 25% by weight, B 2 O 3 5 to 9% by weight, Bi 2 O 3
4-9 wt%, Na 2 O 0-11 wt%, Fe 2 O
When a magnetic core half body is fused by using a glass having a composition of 10 to 18% by weight of 3 and ZnO in total, a technique of suppressing diffusion into the metallic magnetic thin film by the fused glass and preventing cracks is also disclosed. It is disclosed in JP-A 1-28248.
【０００３】[0003]
【発明が解決しようとする課題】以上のような金属磁性
薄膜を形成した磁気ヘッドにおいて、コバルト系合金磁
性薄膜を形成した磁気ヘッドにおいては、金属薄膜とガ
ラスとの間にＳｉＯ2 −Ｃｒ−Ｔａ2 Ｏ5 のような厚く
強固な保護膜を予め形成して、合金磁性薄膜への融着ガ
ラスの融着時に合金磁性薄膜との間に侵食拡散反応が生
じ、その界面に沿ってガラスが濁り透明度が劣化し、ヘ
ッドの特性を左右するギャップの深さ（デプス長）を読
み取ることが不可能になるばかりか、甚だしい時にはガ
ラス層が変質したり、ひび割れが生ずることを防止しな
ければならなかった。本発明は上記課題を解決した複合
磁気ヘッドを提供することを目的とする。In the magnetic head formed with the metal magnetic thin film as described above, in the magnetic head formed with the cobalt alloy magnetic thin film, SiO 2 --Cr--Ta is formed between the metal thin film and the glass. By forming a thick and strong protective film such as 2 O 5 in advance, an erosion diffusion reaction occurs with the alloy magnetic thin film during fusion bonding of the fused glass to the alloy magnetic thin film, and the glass becomes cloudy along the interface. The transparency deteriorates, making it impossible to read the depth of the gap (depth length) that influences the characteristics of the head. In addition, it is necessary to prevent the glass layer from deteriorating and cracking at extreme times. It was An object of the present invention is to provide a composite magnetic head that solves the above problems.
【０００４】[0004]
【課題を解決するための手段】本発明者らは上記課題を
解決する目的で鋭意研究の結果、複合磁気ヘッドの金属
磁性薄膜が形成された磁気コア半体対を一体化する融着
ガラスとしてＰｂＯ４１〜６２重量％、ＳｉＯ2 １３
〜２７重量％、Ｂ2 Ｏ3 ６〜１０重量％、Ｂｉ2 Ｏ3
６〜１０重量％、Ｎａ2 Ｏ ０〜１１重量％、ＣｏＯ
５〜１０重量％からなる組成のガラスを用いたとこ
ろ、金属磁性薄膜とガラス組成が反応せず、ガラスの濁
り、曇りが生ぜず、又ひび割れも生じない複合磁気ヘッ
ドを完成した。DISCLOSURE OF THE INVENTION As a result of intensive research aimed at solving the above-mentioned problems, the inventors of the present invention have found that as a fused glass that integrates a pair of magnetic core halves on which a metal magnetic thin film of a composite magnetic head is formed. PbO 41 to 62% by weight, SiO 2 13
To 27 wt%, B 2 O 3 6~10 wt%, Bi 2 O 3
6 to 10% by weight, Na 2 O 0 to 11% by weight, CoO
When a glass having a composition of 5 to 10% by weight was used, the composite magnetic head was completed in which the metallic magnetic thin film and the glass composition did not react with each other, the glass did not become cloudy or cloudy, and cracks did not occur.
【０００５】本発明は基板上に金属磁性薄膜が形成され
た磁気コア半体対をガラス融着により一体化し、前記金
属磁性薄膜により作動ギャップを構成してなる複合磁気
ヘッドにおいて、前記融着ガラスがＰｂＯ ４１〜６２
重量％、ＳｉＯ2 １３〜２７重量％、Ｂ2 Ｏ3 ６〜
１０重量％、Ｂｉ2 Ｏ3 ６〜１０重量％、Ｎａ2 Ｏ０
〜１１重量％、ＣｏＯ ５〜１０重量％から成る組成を
有する複合磁気ヘッドである。The present invention provides a composite magnetic head in which a pair of magnetic core halves each having a metal magnetic thin film formed on a substrate are integrated by glass fusion, and an operating gap is formed by the metal magnetic thin film. Is PbO 41-62
% By weight, SiO 2 13-27% by weight, B 2 O 3 6-
10 wt%, Bi 2 O 3 6~10 wt%, Na 2 O0
The composite magnetic head has a composition of ˜11 wt% and CoO 5-10 wt%.
【０００６】本発明の複合磁気ヘッドは図１で示すよう
に、ギャップ幅規制溝５Ａ、５Ｂを形成したＭｎ−Ｚｎ
フェライト等からなる基板１Ａ、１ＢにＦｅ−Ｃｏ−Ｃ
ｒ−Ｚｒ−Ｙ等の金属磁性薄膜２Ａ、２Ｂを形成して成
る磁気コア半対３Ａ、３Ｂ同士を対向させ、金属磁性薄
膜面を保護膜６Ａ、６Ｂを介して突き合わせ、これを上
記融着ガラス４により一体化したものである。As shown in FIG. 1, the composite magnetic head of the present invention has Mn-Zn formed with gap width regulating grooves 5A and 5B.
Fe-Co-C on the substrates 1A and 1B made of ferrite or the like
The magnetic core halves 3A and 3B formed by forming metal magnetic thin films 2A and 2B such as r-Zr-Y are opposed to each other, and the metal magnetic thin film surfaces are butted against each other through the protective films 6A and 6B, which are fused together as described above. It is integrated by the glass 4.
【０００７】本発明は、現在、解決が困難である、Ｆｅ
−Ｃｏ−Ｃｒ−Ｚｒ−Ｙ等のＣｏを含んだ合金磁性薄膜
を用いることにより、特徴が現れる。The present invention is currently difficult to solve, Fe
A characteristic appears by using an alloy magnetic thin film containing Co such as -Co-Cr-Zr-Y.
【０００８】本発明の融着ガラスはＰｂＯ ４１〜６２
重量％、ＳｉＯ2 １３〜２７重量％、Ｂ2 Ｏ3 ６〜
１０重量％、Ｂｉ2 Ｏ3 ６〜１０重量％、Ｎａ2 Ｏ
０〜１１重量％（但し、０重量％は含まず）、ＣｏＯ
５〜１０重量％の組成を有するものである。そして、ガ
ラス転移点４００〜４２０°Ｃ、屈服点４２５〜４４５
°Ｃ、融着温度５４０〜６００°Ｃ、熱膨張係数 ８５
〜１２５×１０-7°Ｃ-1の物性値を有するものである。The fused glass of the present invention is made of PbO 41-62.
% By weight, SiO 2 13-27% by weight, B 2 O 3 6-
10% by weight, Bi 2 O 3 6-10% by weight, Na 2 O
0-11% by weight (excluding 0% by weight), CoO
It has a composition of 5 to 10% by weight. And glass transition point 400-420 ° C, yield point 425-445
° C, fusion temperature 540-600 ° C, thermal expansion coefficient 85
It has a physical property value of up to 125 × 10 -7 ° C -1 .
【０００９】上記ガラス組成において、ＰｂＯが４１重
量％未満である場合は、融着温度が６５０°Ｃを超え、
金属磁性膜が基板と反応しやすくなり疑似ギャップを作
り、ヘッドの電磁特性を劣化させる。また６２重量％を
超えると、ガラス中に析出物が発生しやすくなり、濡れ
性の劣化、線引きが難しくなり、ガラスの不均一が起こ
る。ＳｉＯ2 が１３重量％未満では、ガラスそのものの
透明性が劣化し、低反応性、高透過性の特性が失われ
る。又、２７重量％を超えると融着温度が６５０°Ｃを
超え、ヘッドに疑似ギャップが出来やすくなる。In the above glass composition, when PbO is less than 41% by weight, the fusion temperature exceeds 650 ° C,
The metal magnetic film easily reacts with the substrate to form a pseudo gap, which deteriorates the electromagnetic characteristics of the head. On the other hand, when it exceeds 62% by weight, precipitates are likely to be generated in the glass, the wettability is deteriorated, drawing is difficult, and the glass is nonuniform. If the SiO 2 content is less than 13% by weight, the transparency of the glass itself deteriorates and the properties of low reactivity and high transparency are lost. On the other hand, if it exceeds 27% by weight, the fusing temperature exceeds 650 ° C, and a pseudo gap is likely to be formed in the head.
【００１０】Ｂ2 Ｏ3 が６重量％未満ではガラスが結晶
化して、線引きが難しくなり、濡れ性が劣化する。又１
０重量％を超えると濡れが良くなりすぎ、保護膜、金属
磁性薄膜を侵食する。Ｂｉ2 Ｏ3 が６重量％未満ではガ
ラスの耐水性が劣化する。又１０重量％を超えると融着
中にガラス中で還元して生ずるＢｉの量が多くなり、磁
気ヘッドの摺動面に使用しにくくなる。Ｎａ2 Ｏが１１
重量％を超えると濡れ性が良くなりすぎ、保護膜、金属
磁性薄膜を侵食し、又耐水性が劣化し、更に析出物が発
生しやすくなる。、ＣｏＯは５重量％未満は金属磁性薄
膜の成分がガラス中に浸透してガラスの透明度を失う、
又１０重量％を超えた場合ガラス自体の透明度が劣化す
る。If the content of B 2 O 3 is less than 6% by weight, the glass is crystallized, drawing becomes difficult and the wettability deteriorates. Again 1
If it exceeds 0% by weight, wetting becomes too good and the protective film and the metal magnetic thin film are eroded. If the Bi 2 O 3 content is less than 6% by weight, the water resistance of the glass deteriorates. On the other hand, if it exceeds 10% by weight, the amount of Bi produced by reduction in the glass during fusion increases, and it becomes difficult to use it for the sliding surface of the magnetic head. Na 2 O is 11
If it exceeds 5% by weight, the wettability becomes too good, the protective film and the metal magnetic thin film are eroded, the water resistance is deteriorated, and further precipitates are easily generated. If CoO is less than 5% by weight, the components of the metal magnetic thin film penetrate into the glass and lose the transparency of the glass.
If it exceeds 10% by weight, the transparency of the glass itself deteriorates.
【００１１】[0011]
【実施例１】図１を参照して説明する。本例の複合磁気
ヘッドはＭｎ−Ｚｎフェライトの磁性材料から成る１対
の基板１Ａ、１Ｂそしてこの基板はテ−プ摺動面同士の
間には、記録再生を行うギャップ５Ａ、５Ｂが設けられ
ている。そして、この１対の基板１Ａ、１Ｂのギャップ
対向面を、Ｃｏ８１原子量％、Ｆｅ４原子量％、Ｃｒ５
原子量％、Ｚｒ５原子量％、Ｙ５原子量％の金属磁性薄
膜２Ａ、２Ｂを形成した磁気コア半対３Ａ、３ＢをＰｂ
Ｏ ５６．９重量％、ＳｉＯ2 １７．１重量％、Ｂ2
Ｏ3 ８．７重量％、Ｂｉ2 Ｏ3 ８．７重量％、Ｎａ
2 Ｏ ２．６重量％及びＣｏＯ ６．０重量％の組成、
熱膨張係数α（１００〜３５０°Ｃにおいて）１００×
１０-7（°Ｃ）９７．１、転移点（°Ｃ）４０９、屈服
点（°Ｃ）４３７の融着ガラスにより一体化した複合磁
気ヘッド。First Embodiment A description will be given with reference to FIG. The composite magnetic head of this example has a pair of substrates 1A and 1B made of a magnetic material of Mn-Zn ferrite, and gaps 5A and 5B for recording and reproducing are provided between the tape sliding surfaces of the substrates. ing. Then, the gap facing surfaces of the pair of substrates 1A and 1B are formed with Co 81 atomic%, Fe 4 atomic% and Cr5
The magnetic core halves 3A and 3B on which the metal magnetic thin films 2A and 2B of atomic weight%, Zr5 atomic weight%, and Y5 atomic weight% are formed are Pb.
O 56.9% by weight, SiO 2 17.1% by weight, B 2
O 3 8.7% by weight, Bi 2 O 3 8.7% by weight, Na
Composition of 2.6% by weight of 2 O and 6.0% by weight of CoO,
Thermal expansion coefficient α (at 100 to 350 ° C) 100 x
A composite magnetic head integrated with fused glass having a temperature of 10 -7 (° C) 97.1, a transition point (° C) 409, and a yield point (° C) 437.
【００１２】[0012]
【実施例２】実施例１と同一の磁気コア半対をＰｂＯ
５５．５重量％、ＳｉＯ2 １６．７重量％、Ｂ2 Ｏ3
８．６重量％、Ｂｉ2 Ｏ3 ８．６重量％、Ｎａ2 Ｏ
２．６重量％及びＣｏＯ ８．０重量％の組成、熱膨
張係数α（１００〜３５０°Ｃにおいて）１００×１０
-7（°Ｃ）９４．７、転移点（°Ｃ）４１５、屈服点
（°Ｃ）４４１の融着ガラスにより一体化した複合磁気
ヘッド。Second Embodiment The same magnetic core half pair as in the first embodiment is made of PbO.
55.5% by weight, SiO 2 16.7% by weight, B 2 O 3
8.6% by weight, Bi 2 O 3 8.6% by weight, Na 2 O
Composition of 2.6% by weight and 8.0% by weight of CoO, thermal expansion coefficient α (at 100 to 350 ° C.) 100 × 10
-7 (° C) 94.7, transition point (° C) 415, yield point (° C) 441 fused magnetic head integrated with fused glass.
【００１３】[0013]
【実施例３】実施例１と同一の磁気コア半対をＰｂＯ
５４．４重量％、ＳｉＯ2 １６．３重量％、Ｂ2 Ｏ3
８．４重量％、Ｂｉ2 Ｏ3 ８．４重量％、Ｎａ2 Ｏ
２．５重量％及びＣｏＯ １０．０重量％の組成、熱
膨張係数α（１００〜３５０°Ｃにおいて）１００×１
０-7（°Ｃ）９５．０、転移点（°Ｃ）４１２、屈服点
（°Ｃ）４４０の融着ガラスにより一体化した複合磁気
ヘッド。[Third Embodiment] The same magnetic core half pair as in the first embodiment is made of PbO.
54.4 wt%, SiO 2 16.3 wt%, B 2 O 3
8.4% by weight, Bi 2 O 3 8.4% by weight, Na 2 O
Composition of 2.5% by weight and 10.0% by weight of CoO, coefficient of thermal expansion α (at 100 to 350 ° C.) 100 × 1
A composite magnetic head integrated with fused glass having a temperature of 0 -7 (° C) 95.0, a transition point (° C) 412, and a yield point (° C) 440.
【００１４】[0014]
【比較例１】実施例１と同一の磁気コア反対対をＰｂＯ
５８．１重量％、ＳｉＯ2 １７．４重量％、Ｂ2 Ｏ
3 ８．９重量％、Ｂｉ2 Ｏ3 ８．９重量％、Ｎａ2
Ｏ２．７重量％、ＣｏＯ ４．０重量％の組成、熱膨張
係数α（１００〜３５０°Ｃにおいて）１００×１０-7
（°Ｃ）９８．０、転移点（°Ｃ）４０８、屈服点（°
Ｃ）４３５の融着ガラス４により一体化した複合磁気ヘ
ッドである。[Comparative Example 1] The same magnetic core opposite pair as in Example 1 was replaced with PbO.
58.1% by weight, SiO 2 17.4% by weight, B 2 O
3 8.9% by weight, Bi 2 O 3 8.9% by weight, Na 2
O2.7% by weight, CoO 4.0% by weight, thermal expansion coefficient α (at 100 to 350 ° C.) 100 × 10 −7
(° C) 98.0, transition point (° C) 408, yield point (°
C) A composite magnetic head integrated by the fused glass 4 of 435.
【００１５】[0015]
【比較例２】実施例１と同一の磁気コア半対をＰｂＯ
５３．２重量％、ＳｉＯ2 １５．９重量％、Ｂ2 Ｏ3
８．２重量％、Ｎａ2 Ｏ ２．５重量％、Ｂｉ2 Ｏ3
８．２重量％、ＣｏＯ １２．０重量％の組成、熱膨
張係数α（１００〜３５０°Ｃにおいて）１００×１０
-7（°Ｃ）９４．０、転移点（°Ｃ）４１５、屈服点
（°Ｃ）４４０の融着ガラスにより一体化した複合磁気
ヘッド。[Comparative Example 2] The same magnetic core half pair as in Example 1 was replaced with PbO.
53.2% by weight, SiO 2 15.9% by weight, B 2 O 3
8.2 wt%, Na 2 O 2.5 wt%, Bi 2 O 3
Composition of 8.2% by weight, CoO 12.0% by weight, thermal expansion coefficient α (at 100 to 350 ° C.) 100 × 10
-7 (° C) 94.0, transition point (° C) 415, yield point (° C) 440 fused magnetic head integrated with fused glass.
【００１６】比較例の複合磁気ヘッドはＣｏＯが１０重
量％を超えているから、ガラスの色が濃くなりすぎて、
ガラス自体の透明度が著しく劣化し、ガラスを透過して
デプス長を読むことが不可能となり、しかも融着後のガ
ラス中に泡が多く残り、これがヘッド摺動面に露出する
と穴になるため融着ガラスは磁気ヘッドに適さない。In the composite magnetic head of the comparative example, since CoO exceeds 10% by weight, the color of the glass becomes too dark,
The transparency of the glass itself deteriorates significantly, it becomes impossible to read the depth length through the glass, and more bubbles remain in the glass after fusion, which becomes a hole when exposed on the head sliding surface and melts. Glasses are not suitable for magnetic heads.
【００１７】以上のように、本発明の複合磁気ヘッドは
磁気コアに形成された金属磁性薄膜がＣｏ系の合金であ
っても、その成分が融着ガラス中に拡散することを防止
し、透明性が良好である。そして、それによるひび割れ
を無くすことができる。又、融着ガラスの転移点が４０
０〜４２０°Ｃ、屈服点４２５〜４４５°Ｃで、作業温
度として５４０〜６００°Ｃを設定することができる。
さらに、融着ガラスは熱膨張係数が８５〜１２５×１０
-7°Ｃ-1であるから、金属磁性薄膜の熱膨張係数と整合
を図り、融着作業時のガラスのクラックの発生を抑制で
きる。As described above, in the composite magnetic head of the present invention, even if the metal magnetic thin film formed on the magnetic core is a Co-based alloy, its components are prevented from diffusing into the fused glass and are transparent. Good property. And, the crack due to it can be eliminated. Also, the transition point of fused glass is 40
The working temperature can be set to 540 to 600 ° C at 0 to 420 ° C and the yield point 425 to 445 ° C.
Further, the fused glass has a thermal expansion coefficient of 85 to 125 × 10.
Since the temperature is -7 ° C -1, it can be matched with the coefficient of thermal expansion of the metal magnetic thin film, and the occurrence of cracks in the glass during the fusing work can be suppressed.
【００１８】[0018]
【発明の効果】本発明は複合磁気ヘッドにおいて、金属
磁性薄膜にＣｏを含む合金を用いた場合でも、融着ガラ
スが透明でデプスを目視でき、所要寸法のデプスを容易
に形成できるとともに融着ガラスの変質による割れを防
止する効果を有するものである。According to the present invention, in a composite magnetic head, even when an alloy containing Co is used for the metal magnetic thin film, the fused glass is transparent and the depth can be visually observed, and the depth of the required size can be easily formed and the fusion is performed. It has an effect of preventing cracking due to alteration of glass.
【図１】本発明の複合磁気ヘッドの斜視図である。FIG. 1 is a perspective view of a composite magnetic head of the present invention.
１Ａ、１Ｂ 基板 ２Ａ、２Ｂ 金属磁性薄膜 ３Ａ、３Ｂ 磁気コア半対 ４ 融着ガラス ５Ａ、５Ｂ ギャップ幅規制溝 ６ 巻線穴 ６Ａ、６Ｂ 保護膜 1A, 1B Substrate 2A, 2B Metallic magnetic thin film 3A, 3B Magnetic core half pair 4 Fused glass 5A, 5B Gap width regulation groove 6 Winding hole 6A, 6B Protective film
Claims (1)
ア半体対をガラス融着により一体化し、前記金属磁性薄
膜により作動ギャップを構成してなる複合磁気ヘッドに
おいて、 上記金属磁性薄膜がＣｏ系合金磁性薄膜であり、 かつ上記融着ガラスがＰｂＯ ４１〜６２重量％、Ｓｉ
Ｏ2 １３〜２７重量％、Ｂ2 Ｏ3 ６〜１０重量部
％、Ｂｉ2 Ｏ3 ６〜１０重量％、Ｎａ2 Ｏ ０〜１１
重量％、ＣｏＯ ５〜１０重量％から成る組成を有する
ことを特徴とする、複合磁気ヘッド。1. A composite magnetic head in which a pair of magnetic core halves each having a metal magnetic thin film formed on a substrate are integrated by glass fusion, and an operating gap is constituted by the metal magnetic thin film, wherein the metal magnetic thin film is It is a Co-based alloy magnetic thin film, and the fused glass is PbO 41-62 wt%, Si
O 2 13 to 27 wt%, B 2 O 3 6~10 parts by weight%, Bi 2 O 3 6~10 wt%, Na 2 O 0~11
A composite magnetic head having a composition of wt% and CoO of 5 to 10 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9485392A JPH05266417A (en) | 1992-03-23 | 1992-03-23 | Combined magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9485392A JPH05266417A (en) | 1992-03-23 | 1992-03-23 | Combined magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05266417A true JPH05266417A (en) | 1993-10-15 |
Family
ID=14121596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9485392A Pending JPH05266417A (en) | 1992-03-23 | 1992-03-23 | Combined magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05266417A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1302939A2 (en) * | 1997-06-09 | 2003-04-16 | Hitachi, Ltd. | Optical information recording medium |
-
1992
- 1992-03-23 JP JP9485392A patent/JPH05266417A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1302939A2 (en) * | 1997-06-09 | 2003-04-16 | Hitachi, Ltd. | Optical information recording medium |
| EP1302939A3 (en) * | 1997-06-09 | 2003-06-04 | Hitachi, Ltd. | Optical information recording medium |
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