JPS6331851B2 - - Google Patents
Info
- Publication number
- JPS6331851B2 JPS6331851B2 JP54130765A JP13076579A JPS6331851B2 JP S6331851 B2 JPS6331851 B2 JP S6331851B2 JP 54130765 A JP54130765 A JP 54130765A JP 13076579 A JP13076579 A JP 13076579A JP S6331851 B2 JPS6331851 B2 JP S6331851B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- core
- magnetic head
- groove
- gap
- 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
- 239000011521 glass Substances 0.000 claims description 14
- 238000004804 winding Methods 0.000 claims description 13
- 239000002131 composite material Substances 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 12
- 230000008018 melting Effects 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims 4
- 238000005520 cutting process Methods 0.000 claims 1
- 238000005304 joining Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 11
- 239000000696 magnetic material Substances 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- -1 ZrO 2 b Chemical class 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Description
【発明の詳細な説明】
本発明は、狭い幅の予め決められたトラツクに
磁気記録する書き−読みギヤツプと消去ギヤツプ
とを組合せた複合磁気ヘツドの製造方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a composite magnetic head that combines a write-read gap and an erase gap for magnetic recording on narrow predetermined tracks.
記録媒体に高記録密度で記録するデイスク記録
は記録されたトラツクに隣接する位置に密接して
記録トラツクの位置に記録するために、記録媒体
の中の隣り合う記録媒体間の隣接部分で記録が重
複して、隣接トラツクからの記録磁界が雑音信号
として混入するクロストークが生じ易くなる。こ
のために、記録した記録媒体の両端部を消去し
て、その領域の幅を狭くしてクロストークを防ぐ
方法がとられている。 In disk recording, in which recording is performed on a recording medium at high recording density, recording is performed at a position adjacent to a recorded track in close proximity to the recorded track. In addition, crosstalk in which recording magnetic fields from adjacent tracks are mixed in as noise signals is likely to occur. For this reason, a method is used to prevent crosstalk by erasing both ends of the recorded recording medium and narrowing the width of the area.
すなわち、記録媒体を高記録密度にすればする
ほど、すなわちトラツクの間隔が狭まれば狭まる
ほど、記録位置すなわち記録されるトラツクの幅
を正確に限定することが必要となつてくる。 That is, the higher the recording density of a recording medium, that is, the narrower the spacing between tracks, the more accurately it becomes necessary to limit the recording position, that is, the width of the track to be recorded.
このような記録一再生を行う複合磁気ヘツド
は、第１図で示すように巻線溝が形成される磁性
体コア１に略Ｌ字形したセラミツク等の非磁性体
２を付着した磁性体コア３とを書き−読みギヤツ
プ４となる間〓材を介在し接合した書き−読み磁
気へツドコア５と、上記書き−読み磁気へツドコ
ア５と同様な構成とされる第２図で示す消去ギヤ
ツプ６をもつ磁性体コア７，８からなる消去磁気
へツドコア９とを、第３図で示すように、上記書
き−読み磁気へツドコア５の両側部に、この磁気
へツドコア５の非磁性体２と上記消去磁気へツド
コア９の非磁性体１０とを相対する向きで、か
つ、書き−読みギヤツプ４と消去ギヤツプ６との
間隔寸法をだして一体に接合している。 As shown in FIG. 1, a composite magnetic head that performs recording and reproducing is composed of a magnetic core 1 in which a winding groove is formed, and a magnetic core 3 having a substantially L-shaped non-magnetic material 2 such as ceramic attached thereto. A writing-reading magnetic head core 5 is connected to the writing-reading gap 4 with a material interposed therebetween, and an erasing gap 6 shown in FIG. As shown in FIG. 3, an erasing magnetic head core 9 consisting of magnetic cores 7 and 8 is placed on both sides of the write-read magnetic head core 5. The erasing magnetic head core 9 and the non-magnetic body 10 are integrally joined with the direction facing each other and the distance between the writing-reading gap 4 and the erasing gap 6 being determined.
ところで、この磁気へツドは、書き−読み磁気
へツドコアのギヤツプ幅を規制する実質的な磁気
へツドコアの両側面に、消去磁気へツドコアを配
置する構造がとられている。このため、記録媒体
上のトラツク幅両端部の消去は第４図で示すよう
に、消去ギヤツプ６から主に横方向に出る矢印１
１で示す磁界により消去するため、書き−読み磁
気へツドコアで記録した媒体上のトラツク幅
（Tw）より消去磁気へツドコアで消去したトラ
ツク幅（Gw）にするいわゆるトンネル効果が不
十分である。すなわち、横方向に出る磁界で消去
するために正確な幅に消去する消去効果が十分に
得にくい。また、高記録密度化にともなつて、記
録するトラツク幅が狭くなればなるほど、磁気へ
ツドの構造から製作が困難となる。 By the way, this magnetic head has a structure in which erasing magnetic head cores are arranged on both sides of a substantial magnetic head core that regulates the gap width of the write-read magnetic head core. For this reason, erasing at both ends of the track width on the recording medium is performed mainly by arrows 1 and 2 coming out from the erasing gap 6 in the horizontal direction, as shown in FIG.
1, the so-called tunneling effect is insufficient, which makes the track width (Gw) erased by the erase magnetic head core smaller than the track width (Tw) recorded on the medium by the write-read magnetic head core. That is, since erasing is performed using a magnetic field emitted in the horizontal direction, it is difficult to obtain a sufficient erasing effect of erasing in an accurate width. Furthermore, as the recording density increases, the narrower the recording track width becomes, the more difficult it becomes to manufacture the magnetic head due to its structure.
本発明は、上述した事情にもとずいてなされた
もので、媒体上の記録位置を正確に限定し、磁気
媒体のトラツク単位幅で高記録密度の記録ができ
る複合磁気ヘツドの製造方法を得るにある。 The present invention has been made based on the above-mentioned circumstances, and provides a method for manufacturing a composite magnetic head that can accurately limit the recording position on the medium and perform high recording density recording on a track unit width of the magnetic medium. It is in.
以下、図面を参照して本発明の一実施例の複合
磁気ヘツドの製造方法により製造された複合磁気
ヘツドについて説明する。 Hereinafter, a composite magnetic head manufactured by a method for manufacturing a composite magnetic head according to an embodiment of the present invention will be described with reference to the drawings.
第５図および第６図において、書き−読み磁気
へツドコア２１は、磁性体コア２２，２３からな
り、上記磁性体コア２２には、書き−読みコイル
２４を巻回する巻線溝２５が形成されている。ま
た、磁性体コア２２と磁性体コア２３との接合面
間には、書き−読みギヤツプ２６を形成する間〓
材を介在して接合されている。上記書き−読み磁
気へツドコア２１の上端部の両側部には書き−読
みギヤツプ２６の幅を規制するように、この磁気
ヘツドコア２１の中央部を残してギヤツプ深さよ
り深い高融点ガラスを充填した切欠き部２７が形
成されている。一方、消去磁気へツドコア２８は
上記書き−読み磁気へツドコア２１と同じように
磁性体コア２９，３０とからなり、上記磁性体コ
ア２９には消去コイル３１を巻回する巻線溝３２
が形成されている。また、上記磁性体コア２９，
３０の接合面間には非磁性の間〓材を介在して消
去ギヤツプ３３が形成されている。上記消去磁気
へツドコア２８の上面には、上記書き−読みギヤ
ツプ幅と同じかまたはそれより小さい幅で、か
つ、消去ギヤツプの深さより深く高融点ガラスを
充填した溝３４が形成されている。このように構
成された磁気へツドコア２１，２８は、セラミツ
クなどの非磁性材３５と低融点ガラス３６からな
る間〓材３７を介在して一体に接合されている。 In FIGS. 5 and 6, the write-read magnetic head core 21 is composed of magnetic cores 22 and 23, and the magnetic core 22 is formed with a winding groove 25 around which the write-read coil 24 is wound. has been done. Further, a write-read gap 26 is formed between the joint surfaces of the magnetic core 22 and the magnetic core 23.
They are joined with a material in between. On both sides of the upper end of the writing-reading magnetic head core 21, a cut is filled with high melting point glass that is deeper than the gap depth, leaving the central part of the magnetic head core 21 so as to regulate the width of the writing-reading gap 26. A notch 27 is formed. On the other hand, the erasing magnetic head core 28 is composed of magnetic cores 29 and 30 in the same way as the write-read magnetic head core 21, and the magnetic core 29 has a winding groove 32 around which the erasing coil 31 is wound.
is formed. Further, the magnetic core 29,
An erasing gap 33 is formed between the joint surfaces of 30 with a non-magnetic interlayer interposed therebetween. A groove 34 filled with high melting point glass is formed on the upper surface of the erase magnetic head core 28 and has a width equal to or smaller than the write-read gap width and deeper than the erase gap depth. The magnetic head cores 21 and 28 constructed in this manner are integrally joined with a barrier material 37 made of a non-magnetic material 35 such as ceramic and a low melting point glass 36 interposed therebetween.
このように構成された磁気ヘツドは、第７図で
示すように、磁気的に記録される媒体上のトラツ
ク幅が書き−読みギヤツプの幅（Tw′）に等しい
幅となり、磁気記録媒体と磁気ヘツドが相対的に
動くにつれて、消去コイル３１を適当に付勢させ
ると、消去磁気へツドコアの両側部に設けた消去
ギヤツプ３３により、それらの消去ギヤツプ幅
（Gw′）を横ぎる既に記録された部分が消去され
る。このように、初めて記録された幅よりも狭い
記録されるトラツクの幅が達成される。 As shown in FIG. 7, the magnetic head constructed in this way has a track width on the magnetically recorded medium equal to the writing-reading gap width (Tw'), and the magnetic recording medium and the magnetic As the heads move relative to each other, when the erase coil 31 is suitably energized, the erase gaps 33 provided on both sides of the erase magnetic head core cause the erase gap 33 that has already been recorded across the erase gap width (Gw') to be removed. part will be deleted. In this way, a width of the recorded track is achieved which is narrower than the width recorded for the first time.
次に、本発明の一実施例の磁気ヘツドの製造方
法について述べる。 Next, a method of manufacturing a magnetic head according to an embodiment of the present invention will be described.
第８図に示すように、角柱状に形成した磁性体
ブロツク４１の一側面で、その長手方向に横切る
並列状の溝４２を穿設する。上記溝４２はそれぞ
れ溝間隔Ｐ、溝幅Ｗおよび溝深さｈで加工されて
いる。ただし、溝深さｈはギヤツプ深さよりも深
いものとする。次に、第９図で示すように、上記
溝４２部に高融点ガラス４３を加熱充填したの
ち、二点鎖線４４で示すように、４個の磁性体コ
アブロツク４５，４６，４７，４８に分割する。
次に、第１０図で示すように、上記４個に分割し
た磁性体コアブロツク４５，４６，４７，４８の
うち、両側の磁性体コアブロツク４５，４８に巻
線を施こす巻線溝４９および接着用低融点ガラス
を装着するためにガラスを充填した溝部４２とは
反対側に切り欠き５０をそれぞれ形成する。次
に、第１１図ａ，ｂ，ｄ，ｅでそれぞれ示すよう
に、各々対向してギヤツプを形成する面すなわち
上記磁性体コアブロツク４５，４８の巻線溝４９
を形成した面４５ａ，４８ａおよび上記磁性体コ
アブロツク４６，４７の両側面４６ａ，４７ａを
鏡面研摩する。また、少なくとも上記磁性体コア
ブロツク４５，４８の鏡面研摩した面に書き−読
みギヤツプおよび消去ギヤツプとなるギヤツプ厚
さに等しい厚さのたとえばSiO2、Al2O3、および
ZrO2等の金属酸化物からなる非磁性蒸着膜４５
ｂ，４８ｂを形成する。この場合、磁性体コアブ
ロツク４５，４６および磁性体コアブロツク４
７，４８のそれぞれの対向面間の各面に蒸着膜を
形成する場合は、ギヤツプ厚の半分の厚さに蒸着
するのが好ましい。さらに、上記磁性体コアブロ
ツク４５，４６，４７，４８を組合せしたとき、
書き−読みギヤツプと消去ギヤツプと間隔が所定
寸法となる第１１図ｃのたとえばセラミツク等の
非磁性材４９および低融点ガラス材５０からなる
間〓材５１を磁性体コアブロツク４６と磁性体コ
アブロツク４７との間に介在し、磁性体コアブロ
ツク４５、磁性体コアブロツク４６、間〓材５
１、磁性体コアブロツク４８、および磁性体コア
ブロツク４９の順序で組合せする。上記間〓材５
１は、非磁性材４９と低融点ガラス５０の組合せ
は、非磁性材の上下両端部に非磁性材を接合した
ものである。次に、第１２図で示すように、上記
磁性体コアブロツク４５および４６は、それぞれ
のガラスを充填した溝４２が同一線上にくるよう
に組合せする。また、同様に、上記磁性体コアブ
ロツク４７および４８も溝が同一線上にくるよう
に組合せする。上記組合せした磁性体コアブロツ
ク４５，４６と同様に組合せした磁性体コアブロ
ツク４７，４８との間すなわち磁性体コアブロツ
ク４６と磁性体コアブロツク４７との間に上記間
〓材５１を介在するとともに、第１３図で示すよ
うに、間〓物５１を境にして溝と溝との間に溝が
くるように互いをずらして組合せする。次に第１
２図のように切り欠き部および巻線溝部に低融点
ガラス材５２を配置して、炉中で加熱し一体に接
合する。次に、第１３図のように二点鎖線５３で
示す所定のコア厚で切断し巻線を施こし複合磁気
ヘツドを得る。 As shown in FIG. 8, parallel grooves 42 are formed in one side of a magnetic block 41 formed into a prismatic shape, extending in the longitudinal direction thereof. The grooves 42 are machined to have a groove interval P, a groove width W, and a groove depth h, respectively. However, the groove depth h is assumed to be deeper than the gap depth. Next, as shown in FIG. 9, after heating and filling the groove 42 with high melting point glass 43, it is divided into four magnetic core blocks 45, 46, 47, and 48 as shown by two-dot chain lines 44. do.
Next, as shown in FIG. 10, among the four divided magnetic core blocks 45, 46, 47, 48, winding grooves 49 for winding the magnetic core blocks 45, 48 on both sides, and bonding. A notch 50 is formed on the opposite side of the groove 42 filled with glass for attaching low melting point glass for use. Next, as shown in FIGS. 11a, b, d, and e, the surfaces facing each other to form a gap, that is, the winding grooves 49 of the magnetic core blocks 45, 48,
The surfaces 45a, 48a on which the magnetic core blocks 46, 47 are formed and both side surfaces 46a, 47a of the magnetic core blocks 46, 47 are polished to a mirror finish. Further, at least the mirror-polished surfaces of the magnetic core blocks 45, 48 are coated with, for example, SiO 2 , Al 2 O 3 , and
Non-magnetic vapor deposited film 45 made of metal oxide such as ZrO 2
b, 48b are formed. In this case, the magnetic core blocks 45, 46 and the magnetic core block 4
When a vapor deposited film is formed on each surface between the opposing surfaces of electrodes 7 and 48, it is preferable that the film be vapor deposited to a thickness that is half the gap thickness. Furthermore, when the magnetic core blocks 45, 46, 47, and 48 are combined,
A spacer material 51 made of a non-magnetic material 49 such as ceramic and a low melting point glass material 50 as shown in FIG. A magnetic core block 45, a magnetic core block 46, and a spacer 5 are interposed between the two.
1. Combine the magnetic core block 48 and the magnetic core block 49 in this order. Above material 5
1, the combination of the non-magnetic material 49 and the low melting point glass 50 is such that the non-magnetic material is bonded to both the upper and lower ends of the non-magnetic material. Next, as shown in FIG. 12, the magnetic core blocks 45 and 46 are combined so that the grooves 42 filled with glass are aligned on the same line. Similarly, the magnetic core blocks 47 and 48 are also combined so that their grooves are on the same line. The intervening material 51 is interposed between the magnetic core blocks 45 and 46 combined above and the magnetic core blocks 47 and 48 combined in the same manner, that is, between the magnetic core blocks 46 and 47. As shown, the grooves are shifted and assembled so that the grooves are located between the grooves with the intermediate material 51 as a boundary. Then the first
As shown in FIG. 2, a low melting point glass material 52 is placed in the notch and the winding groove and heated in a furnace to join them together. Next, as shown in FIG. 13, the core is cut to a predetermined thickness as indicated by the two-dot chain line 53 and wound to obtain a composite magnetic head.
なお、この巻線を装着する際に、磁気ヘツドコ
アの下端部を切断し、コイルを巻付けするまたは
巻線を施こしたボビンを挿入したのち、再び切断
箇所を接合してもよい。 Incidentally, when installing this winding, the lower end of the magnetic head core may be cut, and after winding the coil or inserting a bobbin on which the winding has been applied, the cut portion may be joined again.
本発明の複合磁気ヘツドの製造方法は、書き−
読みギヤツプ幅部を規制する溝と消去ギヤツプ幅
部を規制する溝を同一溝で形成したのち、分割さ
らに組合せの工程をとるため、各磁性体コアのト
ラツクの突き合せが溝加工精度によつてずれるこ
とがない。また、各磁性体コアを組合せて書き−
読み磁気へツドコアまたは消去磁気へツドコアす
なわち、各ギヤツプを得たのち、間〓材を介在さ
せて上記ギヤツプ位置を規制し所定のギヤツプ位
置関係を得ているため、製造が容易となる。さら
に消去ギヤツプ幅はコア厚さを任意に変えること
で容易に選択できる。 The method for manufacturing a composite magnetic head of the present invention includes
After the grooves regulating the reading gap width and the grooves regulating the erasing gap width are formed in the same groove, the process of dividing and assembling is performed, so the alignment of the tracks of each magnetic core depends on the groove machining accuracy. It never shifts. Also, write by combining each magnetic core.
After obtaining the reading magnetic head core or the erasing magnetic head core, that is, each gap, the gap position is regulated by intervening an intervening material to obtain a predetermined gap positional relationship, which facilitates manufacturing. Furthermore, the erasure gap width can be easily selected by arbitrarily changing the core thickness.
第１図は従来の書き−読み磁気へツドコアを示
す平面図、第２図は同じく消去磁気へツドコアを
示す平面図、第３図は同じく複合磁気ヘツドを示
す正面図、第４図は従来の複合磁気ヘツドで記録
した場合の媒体上の領域を説明する図、第５図は
本発明の一実施例により製造された複合磁気ヘツ
ドを示す斜視図、第６図は同じく正面図、第７図
は本発明の一実施例により製造された複合磁気ヘ
ツドで記録される媒体上の領域を説明する図、第
８図乃至第１２図は本発明の一実施例の複合磁気
ヘツドの製造工程を示す斜視図、第１３図は同じ
く切欠した溝の配置関係を示す正面図である。
２１：書き−読み磁気へツドコア、２６：書き
−読みギヤツプ、２８：消去磁気へツドコア、３
３：消去ギヤツプ、３４：溝、３７：間〓材、４
１：磁性体ブロツク、４２：溝、４３：高融点ガ
ラス、４５，４６，４７，４８：磁性体コアブロ
ツク。
Fig. 1 is a plan view showing a conventional write-read magnetic head core, Fig. 2 is a plan view also showing an erasing magnetic head core, Fig. 3 is a front view also showing a composite magnetic head, and Fig. 4 is a plan view showing a conventional write-read magnetic head core. 5 is a perspective view showing a composite magnetic head manufactured according to an embodiment of the present invention, FIG. 6 is a front view, and FIG. 1 is a diagram illustrating an area on a medium recorded by a composite magnetic head manufactured according to an embodiment of the present invention, and FIGS. 8 to 12 show manufacturing steps of a composite magnetic head according to an embodiment of the present invention. The perspective view and FIG. 13 are front views showing the arrangement of the grooves. 21: Write-read magnetic head core, 26: Write-read gap, 28: Erase magnetic head core, 3
3: Erasing gap, 34: Groove, 37: Intermediate material, 4
1: Magnetic block, 42: Groove, 43: High melting point glass, 45, 46, 47, 48: Magnetic core block.
Claims (1)
かつ長手方向に複数個の並列状の溝を穿設する工
程と、上記溝部に高融点ガラスを充填する工程
と、上記溝部を直角に横切る磁性体ブロツクの長
手方向に４分割してコアブロツクを形成する工程
と、上記４分割したコアブロツクのうち２個の上
記溝を形成した面に隣接する一側面の長手方向に
巻線溝を穿設する工程と、上記巻線溝を穿設した
コアブロツクの巻線溝形成側の分割面および上記
残りのコアブロツクのそれぞれの溝部を形成した
面に隣接する分割面とに鏡面仕上を施こす工程
と、上記巻線溝をもつコアブロツクと残りのコア
ブロツクとをそれぞれ組合せて対となしその対と
なすコアブロツクの接合面の少なくともいずれか
一方にギヤツプを形成させる非磁性酸化膜を付着
する工程と、上記各対をなすコアブロツク間に間
〓材を介在して低融点ガラスにて接合する工程
と、上記接合したブロツクを所定の厚さに切断す
る工程とを具備する複合磁気ヘツドの製造方法。1 A step of drilling a plurality of parallel grooves in the longitudinal direction on one side of a magnetic block formed in a prismatic shape, a step of filling the groove with high melting point glass, and a step of drilling a plurality of parallel grooves in the longitudinal direction on one side of a magnetic block formed in a prismatic shape, a step of filling the groove with high melting point glass, and a step of drilling a plurality of parallel grooves in the longitudinal direction on one side of a magnetic block formed in a prismatic shape. A step of forming a core block by dividing the body block into four in the longitudinal direction, and a step of drilling a winding groove in the longitudinal direction of one side adjacent to the surface on which two of the grooves are formed among the core blocks divided into four. and a step of mirror-finishing the dividing surface on the winding groove forming side of the core block in which the winding groove has been bored and the dividing surface adjacent to the surface on which the respective grooves of the remaining core block are formed; A step of combining the core block with the line groove and the remaining core block to form a pair, and attaching a nonmagnetic oxide film to form a gap on at least one of the joint surfaces of the pair of core blocks, and forming each of the above pairs. A method for manufacturing a composite magnetic head comprising the steps of joining core blocks with low melting point glass with a spacer interposed between them, and cutting the joined blocks to a predetermined thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13076579A JPS5654624A (en) | 1979-10-12 | 1979-10-12 | Compound magnetic head and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13076579A JPS5654624A (en) | 1979-10-12 | 1979-10-12 | Compound magnetic head and its manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5654624A JPS5654624A (en) | 1981-05-14 |
| JPS6331851B2 true JPS6331851B2 (en) | 1988-06-27 |
Family
ID=15042115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13076579A Granted JPS5654624A (en) | 1979-10-12 | 1979-10-12 | Compound magnetic head and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5654624A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0466962U (en) * | 1990-10-22 | 1992-06-15 |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57105822A (en) * | 1980-12-24 | 1982-07-01 | Fuji Elelctrochem Co Ltd | Manufacture for digital magnetic head |
| JPS5819719A (en) * | 1981-07-27 | 1983-02-04 | Fuji Elelctrochem Co Ltd | Production of digital magnetic head |
| JPS5945624A (en) * | 1982-09-06 | 1984-03-14 | Nippon Telegr & Teleph Corp <Ntt> | Magnetic head |
| JPS6061910A (en) * | 1983-09-16 | 1985-04-09 | Mitsubishi Electric Corp | Magnetic head assembly |
| JPS6093110U (en) * | 1983-11-30 | 1985-06-25 | 株式会社三協精機製作所 | magnetic head |
| JPS6182306A (en) * | 1984-09-29 | 1986-04-25 | Nec Kansai Ltd | Core block junction body |
| JPS61145713A (en) * | 1984-12-19 | 1986-07-03 | Akai Electric Co Ltd | Composite magnetic head |
| US4750071A (en) * | 1985-08-28 | 1988-06-07 | Canon Denshi Kabushiki Kaisha | Magnetic head assembly including a pair of heads disposed in the vicinity of each other |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4831243A (en) * | 1971-08-25 | 1973-04-24 | ||
| JPS5023974A (en) * | 1973-07-03 | 1975-03-14 |
-
1979
- 1979-10-12 JP JP13076579A patent/JPS5654624A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4831243A (en) * | 1971-08-25 | 1973-04-24 | ||
| JPS5023974A (en) * | 1973-07-03 | 1975-03-14 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0466962U (en) * | 1990-10-22 | 1992-06-15 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5654624A (en) | 1981-05-14 |
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