JPH02166607A - Magnetic head - Google Patents
Magnetic headInfo
- Publication number
- JPH02166607A JPH02166607A JP32240688A JP32240688A JPH02166607A JP H02166607 A JPH02166607 A JP H02166607A JP 32240688 A JP32240688 A JP 32240688A JP 32240688 A JP32240688 A JP 32240688A JP H02166607 A JPH02166607 A JP H02166607A
- Authority
- JP
- Japan
- Prior art keywords
- head
- magnetic
- tape
- recording
- sliding contact
- 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 abstract description 4
- 238000009826 distribution Methods 0.000 description 8
- 238000004804 winding Methods 0.000 description 4
- 238000007373 indentation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 210000002414 leg Anatomy 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000015654 memory Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
- G11B15/62—Maintaining desired spacing between record carrier and head
-
- 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
- G11B5/1871—Shaping or contouring of the transducing or guiding surface
-
- 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
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/488—Disposition of heads
- G11B5/4893—Disposition of heads relative to moving tape
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
この発明は記録ヘッドと再生ヘッドとを一体化したコン
ビネーション型磁気ヘッドに関し、磁気テープを記録媒
体とする磁気記録再生装置に用いられる。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a combination magnetic head that integrates a recording head and a reproducing head, and is used in a magnetic recording and reproducing apparatus using a magnetic tape as a recording medium.
（ロ）従来の技術
磁気テープを記録媒体とする磁気記録再生装置に４３い
て、近年、録音１１１生信号の高品質化が要求されろ、
１ニー）にな−）できた。これは、オーデイオナーブレ
コーダのデジタル化やコンピュータ用バックアップメモ
リとして用いられろデータストリーマ等の高密度化によ
って、記録再生を行なう信号の短波長化が進んでいるた
めである。(b) Conventional technology In recent years, there has been a demand for higher quality recording raw signals in magnetic recording and reproducing devices that use magnetic tape as a recording medium.
I was able to do 1 knee). This is because the wavelengths of signals used for recording and reproduction are becoming shorter due to the digitization of audio recorders and the increasing density of data streamers used as backup memories for computers.
この短波長領域ての記録再生を円滑かつ確実に行なうた
めには、磁気テープ」−―に信号を記録しごれを再生４
゛ろ過程で磁気テープと磁気ヘッドのギ、トップ部をス
ペーシングを生じさＵｏろことなく安定に接触さＵｏ、
良好なヘッドタッチを得ることが必要である。In order to record and play back smoothly and reliably in this short wavelength range, it is necessary to record signals on magnetic tape and play back the faded signals.
During the rolling process, the magnetic tape and the top part of the magnetic head are brought into stable contact without any spacing.
It is necessary to obtain good head touch.
良好なヘッドタッチを得る方法としては、記録ヘッドと
再生ヘッドの各テープ摺接面をあらかじめ所望の形状に
加工した後、両方のヘッドを一体化してコンビネーショ
ン型磁気ヘッド（以下コンビヘッドと略記する）にする
ことが行なわれていた。To obtain good head touch, the tape sliding surfaces of the recording head and playback head are processed in advance into the desired shape, and then both heads are integrated into a combination type magnetic head (hereinafter abbreviated as combination head). things were being done.
第３図はこのコンビヘッドの正面図を示したもので、信
号の記録を行なう記録ヘッド１と信号の再生を行なう再
生ヘッドｂの各テープ摺接面は、それぞれ所定の曲率を
有する円弧状に加」１．された後に、記録ヘッドａの磁
気ギャップＣ及び再生ヘッドｂの磁気ギャップｄは、そ
れぞれ両ヘッドの各テープ摺接面のほぼ中心になるよう
に配置された。このような配置は、テープガイドによる
テープｅの走行規制とコンビヘッド接合面ｆに対する各
磁気ギャップｃ、ｄの相対位置を制御す“ることによっ
て行なわれていた。FIG. 3 shows a front view of this combination head, in which the tape sliding surfaces of the recording head 1 for recording signals and the reproduction head b for reproducing signals are arranged in an arc shape with a predetermined curvature. 1. After that, the magnetic gap C of the recording head a and the magnetic gap d of the reproducing head b were arranged so as to be approximately at the center of each tape sliding surface of both heads. Such an arrangement has been achieved by regulating the running of the tape e by a tape guide and by controlling the relative positions of the magnetic gaps c and d with respect to the combination head joining surface f.
（ハ）発明が解決しようとする課題
これまで一般には、記録ヘッドと再生ヘッドの各磁気ギ
ャップは、両ヘッドの各テープ摺接面のほぼ中心に配置
することにより良好なヘッドタツヂが得られるとされて
いたが、実際には、各磁気ギャップのそれぞれのテープ
摺接面に対する最適な位置は、必ずしらテープ摺接面の
中心付近にあるのではないことがわかった。(c) Problems to be Solved by the Invention Until now, it has generally been thought that a good head position can be obtained by locating the magnetic gaps between the recording head and the reproducing head approximately at the center of each tape sliding surface of both heads. However, in reality, it has been found that the optimal position of each magnetic gap with respect to each tape sliding surface is not always near the center of the tape sliding surface.
また、記録ヘッドと再生ヘッドの各テープ摺接面をそれ
ぞれ加工した後に両者を一体化する場合、工程が増加し
作業に手数を要するだけでなく、担加工した各ヘッドの
テープ摺接面を損傷しないようにして両者を一体化しな
ければならないため、作業に種々の制約を受は作業能率
を向上することができないというような問題点があった
。In addition, when integrating the tape sliding surfaces of the recording head and playback head after processing them individually, not only does the number of steps increase and the work is labor-intensive, but it also damages the tape sliding surfaces of each head that has been processed. However, since the two must be integrated in such a way as to prevent them from occurring, there are problems in that various restrictions are placed on the work and work efficiency cannot be improved.
この発明は上記の事情を鑑みてなされたものであり、そ
の目的とするところは、従来の技術のをするこれらの問
題点を解決するとと６に、記録ヘッドと再生ヘッドの各
磁気ギャップ位置を両ヘッドのテープ摺接面の最適位置
に配置することができる磁気ヘッドを提供しようとする
しのである。This invention has been made in view of the above circumstances, and its purpose is to solve these problems of the conventional technology.6. The objective is to provide a magnetic head that can be placed at an optimal position between the tape sliding surfaces of both heads.
（ニ）課題を解決するための手段
この発明は、記録ヘッドと再生ヘッドとを一体化した磁
気ヘッドのテープ摺接面を磁気テープの走行（移動）方
向に円弧状に形成し、磁気ヘッドの磁気テープ進入側と
離脱側の各摺接端から記録ヘッドの磁気ギャップと再生
ヘッドの磁気ギャップまでのテープ走行方向の各水平距
離をそれぞれ３０〜１００μｍの範囲になるようにして
磁気ヘッドとしたものである。(d) Means for Solving the Problems This invention forms the tape sliding contact surface of a magnetic head that integrates a recording head and a reproducing head into an arc shape in the running (moving) direction of the magnetic tape, and A magnetic head in which each horizontal distance in the tape running direction from each sliding contact end on the magnetic tape entry side and exit side to the magnetic gap of the recording head and the magnetic gap of the reproducing head is in the range of 30 to 100 μm. It is.
磁気ヘッドの各摺接端から両ヘッドの各磁気ギャップま
でのテープ走行方向における各水平距離をそれぞれ３０
〜１００４ｍの範囲に４゛ると、磁気ヘッドの曲率や磁
気テープの巻き付けｍに影響されずに、磁気テープのへ
ラドタッチは良好に保たれる。Each horizontal distance in the tape running direction from each sliding end of the magnetic head to each magnetic gap of both heads is 30
When the distance is within the range of 4.about.1004 m, the held touch of the magnetic tape can be maintained well without being affected by the curvature of the magnetic head or the winding m of the magnetic tape.
（ホ）作用
記録ヘッドと再生ヘッドとを一体化した後にテープ摺接
面の加工を行えばよいので、両ヘッドのテープ摺接面を
先に加工した後に一体化する場合に比べて、テープ摺接
面の損傷を気にすることなく工程の簡略化がはかられる
。また、コンビヘッドのギャップは、テープ摺接面のほ
ぼ中心でなく最適位置にくるよう配置したため、磁気ヘ
ッドに対する磁気テープのへラドタッチは良好な状態に
保たれる。(E) Function Since the tape sliding contact surface can be processed after the recording head and the reproducing head are integrated, the tape sliding contact surface of both heads is processed first and then integrated. The process can be simplified without worrying about damage to the contact surface. In addition, since the gap of the combination head is arranged at an optimal position rather than approximately at the center of the tape sliding contact surface, the magnetic tape's contact with the magnetic head is maintained in a good condition.
（へ）実施例
この発明を第１図及び第２図（ａ）〜（ｄ）に示す実施
例に基づき詳述する。しかし、これによってこの発明が
限定されるものではない。(f) Example This invention will be described in detail based on the example shown in FIG. 1 and FIGS. 2(a) to (d). However, this invention is not limited thereby.
第１図において、ｌは記録ヘッドと再生ヘッドとをそれ
ぞれの磁気特性に従い所望の位置関係を保持するように
−・本化したコンビヘッドで、この＝Ｉンビヘッド１の
テープ摺接面２は、点Ｏを中心として゛１′、径Ｉｔの
円弧状となるように加工して形成される。テープ摺接面
２の曲率半径Ｒとしては、おおむね１．５〜ｌ０ｘｉの
範囲の値が採用される、。In FIG. 1, l is a combination head in which a recording head and a reproducing head are kept in a desired positional relationship according to their respective magnetic characteristics. It is formed by machining it into a circular arc shape centered on point O and having diameter It. As the radius of curvature R of the tape sliding surface 2, a value in the range of approximately 1.5 to 10xi is adopted.
テープ摺接面２に沿って磁気テープ５が矢印方向に移動
するときのテープ進入側の摺接端をＰ、テープ離脱側の
摺接端をＱとすると、コンビヘッド１における記録ヘッ
ド側の磁気ギャップ３と摺接端１）とのテープ走行方向
における水平距離１１２、及び再生ヘッド側の磁気ギャ
ップ４と摺接端Ｑとの水平距離し、は、それぞれ約３０
〜１００４ｍに定められる。When the magnetic tape 5 moves in the direction of the arrow along the tape sliding contact surface 2, the sliding contact end on the tape entry side is P, and the sliding contact end on the tape leaving side is Q, then the magnetic tape on the recording head side of the combination head 1 The horizontal distance 112 in the tape running direction between the gap 3 and the sliding contact end 1) and the horizontal distance between the magnetic gap 4 on the playback head side and the sliding contact end Q are about 30, respectively.
~1004m.
上記水平圧＃［、、、ｒ、、は、以下に述べるようにし
て決定された。The above-mentioned horizontal pressure #[, , r, , was determined as described below.
即し、第１図に示すような円弧状のコンビヘッドｌに磁
気テープ５が巻き付けられている釣合い状態について、
テープの曲げ剛性、押し込み変形に対する表面剛性、及
びテープガイドぢン、ヘッドの曲率から力の釣合いの方
程式をたて、この方株式を解くことにより、テープ摺接
面２での磁気テープ５と磁気ヘッド間に働く圧力分布を
計算ｉ゛る。この計算においては、磁気テープ５と磁気
ヘッド間に働く圧力は、磁気ヘッドによる磁気テープ５
の押し込み変形ｍに比例するものと仮定した。That is, regarding the balanced state in which the magnetic tape 5 is wound around the arc-shaped combination head l as shown in FIG.
An equation for force balance is created from the bending rigidity of the tape, surface rigidity against indentation deformation, and curvature of the tape guide and head, and by solving this equation, the magnetic tape 5 and the magnetic head at the tape sliding surface 2 are determined. Calculate the pressure distribution between the two. In this calculation, the pressure acting between the magnetic tape 5 and the magnetic head is the pressure exerted on the magnetic tape 5 by the magnetic head.
It was assumed that the indentation deformation m is proportional to the indentation deformation m.
前記方程式を解いて得られた圧力分布は、第２図（ｓ＞
〜（ｄ）に示す通りである。第２図（ａ）〜（（［）に
おいて、横軸はコンビヘッドｌのトップ位置へからの距
離、縦軸は磁気テープ５と磁気ヘッド間に働く圧力であ
る。第２図（ａ）〜（ｄ）の圧力分布を求めるのに用い
られた各定数に対する数値は下表の通りである。The pressure distribution obtained by solving the above equation is shown in Figure 2 (s>
As shown in ~(d). 2(a) to (([), the horizontal axis is the distance from the top position of the combination head l, and the vertical axis is the pressure acting between the magnetic tape 5 and the magnetic head. The numerical values for each constant used to determine the pressure distribution in (d) are shown in the table below.
第２図に示す圧力分布から明らかなように、コンビヘッ
ド１の曲率半径が１．５〜１０１ｍの範囲では、磁気テ
ープ５の巻き付け…がコンビヘッド１のトップ位置へを
中心に左右に１００μｍずつ以上あると、磁気ヘッドと
磁気テープ５間の圧力分布はいずれら双極性を示し、特
に磁気テープ５の巻き付けｍがトップ位置への左右に２
００μｍずつ以上になると、双峰にはさまれた領域での
圧力はほぼ’ｒ／Ｉｔ（ここに′ｒはテープテンション
である）になってしまうごとがわかる。As is clear from the pressure distribution shown in Fig. 2, when the radius of curvature of the combination head 1 is in the range of 1.5 to 101 m, the winding of the magnetic tape 5 is 100 μm on the left and right around the top position of the combination head 1. If the above conditions exist, the pressure distribution between the magnetic head and the magnetic tape 5 will exhibit bipolar characteristics, and in particular, the winding m of the magnetic tape 5 will be 2 to the left and right of the top position.
It can be seen that when the distance increases to 00 μm or more, the pressure in the region sandwiched between the two peaks becomes approximately 'r/It (where 'r is the tape tension).
また、本来、磁気ヘッドと磁気テープとの間に生じるス
ペーシングと圧力との関係は逆比例に近くなると考えら
れる。Furthermore, it is thought that the relationship between the spacing and pressure generated between the magnetic head and the magnetic tape is essentially inversely proportional.
即し、スペーシングが大きくなる程圧力は小さく、逆に
スペーシングが小さくなる程圧力は大きくなる。それ故
、磁気ヘッドと磁気テープ５の間の圧力分布において、
圧力の高い新株スペーシングが小さくなって良好なヘッ
ドタッヂが得られる。That is, the larger the spacing, the lower the pressure, and conversely, the smaller the spacing, the higher the pressure. Therefore, in the pressure distribution between the magnetic head and the magnetic tape 5,
New stock spacing with high pressure is reduced and good head tadge can be obtained.
このような観点から第２図（ａ）〜（ｄ）の圧力分布を
調べてみると、磁気ヘッドの曲率半径Ｒや磁気テープ５
の巻き付は量にはほとんど関係なく、前記距離１７１と
り、とをそれぞれ約３０〜１００μｍに設定したときの
圧力が高くなっていることがわかる。Examining the pressure distributions in Figures 2(a) to (d) from this perspective, we find that the radius of curvature R of the magnetic head and the magnetic tape 5
It can be seen that the winding is almost unrelated to the amount, and the pressure becomes higher when the distance 171 and are set to about 30 to 100 μm, respectively.
したがって、この設定範囲内では圧力と反比例の関係に
あるスペーシングは小さくなっていて、磁気ヘッドと磁
気テープ５との１ｍに良好なヘッドタッヂが得られてい
るものと考えられる。Therefore, it is considered that within this setting range, the spacing, which is inversely proportional to the pressure, is small, and a good head tadge is obtained within 1 m between the magnetic head and the magnetic tape 5.
その上、記録ヘッドと再生ヘッドとを一体化した後に、
コンビヘッド１のテープ摺接面２を円弧状に仕上げる場
合には、記録ヘッドと再生ヘッドとを個別に加工した後
に両ヘッドの磁気ギャップをテープ摺接面のほぼ中心に
配置するような手間をかける必要がなくなるだけでなく
、両ヘッドの一体化のときに先に加工されているテープ
摺接面の損傷を気にしなくてよいため、製造工程を筒略
化し、製造に要する手数を少なくして作業能率を向上す
ることができる。Moreover, after integrating the recording head and the reproducing head,
When finishing the tape sliding surface 2 of the combination head 1 in an arc shape, it is necessary to process the recording head and the reproducing head separately and then positioning the magnetic gap between both heads approximately at the center of the tape sliding surface. Not only does it eliminate the need to apply tape, but it also eliminates the need to worry about damage to the tape sliding surface that is processed first when integrating both heads, which simplifies the manufacturing process and reduces the number of steps required for manufacturing. can improve work efficiency.
（ト）発明の効果
この発明によれば、記録ヘッドと再生ヘッドのテープ摺
接面を個別に加工することなく両者を一体化した後に加
工することができる上、記録ヘッドと再生ヘッドの各磁
気ギャップを良好なヘッドタッヂが得られる位置に配置
することができるため、製造工程の簡略化、作業効率の
向上をはかりながら、良好なヘッドタッヂを維持して磁
気ヘッドによる録音再生を円滑、かつ確実に行うことが
でさるというすぐれた実用的効果を奏する。(G) Effects of the Invention According to the present invention, the tape sliding contact surfaces of the recording head and the reproducing head can be processed after being integrated without processing them individually. Since the gap can be placed at a position where a good head touch can be obtained, the manufacturing process is simplified and work efficiency is improved, while maintaining a good head touch to ensure smooth and reliable recording and playback using the magnetic head. It has excellent practical effects.
第１図はこの発明の一実施例の断面図、第２図（ａ）〜
（ｄ）はこの発明の範囲内の磁気ヘッドと磁気テープと
の間の圧ツノ分布の計算例を示すグラフ、第３図は従来
例の断面図である。
！・・・・・・磁気ヘッド（コンビヘッド）、２・・・
・・・テープ摺接面、
３・・・・・・記録ヘッドの磁気ギャップ、４・・・・
・・再生ヘッドの磁気ギャップ、５・・・・・・磁気テ
ープ、
Ｐ・・・・・・磁気テープ進入側の摺接端、Ｑ・・・・
・・磁気テープ離脱側の摺接端、Ｌ−１・・・・・・記
録ヘッドの磁気ギャップと摺接端Ｐとの磁気テープ走行
方向における水平距離、し、・
ｆ主ヘツドの磁気ギャップと摺接端Ｑとの磁気テープ走
行方向におけろ水平圧部、。
ＴＤＩＳＴＡＮＣＥ融○ＭＨ脚ＴＯＰ ［Ｅ−３１ＮＣ
Ｈ］笛
図
（Ｃ）
第
図
（ｄ）FIG. 1 is a sectional view of an embodiment of the present invention, and FIGS.
(d) is a graph showing an example of calculating the pressure horn distribution between the magnetic head and the magnetic tape within the scope of the present invention, and FIG. 3 is a cross-sectional view of a conventional example. ! ...Magnetic head (combi head), 2...
... Tape sliding contact surface, 3 ... Magnetic gap of recording head, 4 ...
...Magnetic gap of playback head, 5...Magnetic tape, P...Sliding end on magnetic tape entry side, Q...
・・Sliding contact end on the magnetic tape detachment side, L-1 ・・Horizontal distance in the magnetic tape running direction between the magnetic gap of the recording head and the sliding contact end P, ・・f Magnetic gap of the main head and A horizontal pressure section with the sliding end Q in the running direction of the magnetic tape. TDISTANCE Fusion MH Legs TOP [E-31NC
H] Flute diagram (C) Figure (d)
Claims (1)
のテープ摺接面を磁気テープの移動方向に円弧状に形成
し、磁気ヘッドの磁気テープ進入側と離脱側の各摺接端
から記録ヘッドの磁気ギャップと再生ヘッドの磁気ギャ
ップまでの磁気テープ走行方向の各水平距離をそれぞれ
３０〜１００μｍの範囲になるようにしたことを特徴と
する磁気ヘッド。1. The tape sliding contact surface of the magnetic head that integrates the recording head and the reproducing head is formed in an arc shape in the moving direction of the magnetic tape, and the recording head is connected from each sliding contact end of the magnetic head on the magnetic tape entry side and the magnetic tape exit side. 1. A magnetic head characterized in that each horizontal distance in the running direction of the magnetic tape between the magnetic gap of the read head and the magnetic gap of the read head is set to be in the range of 30 to 100 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32240688A JPH02166607A (en) | 1988-12-20 | 1988-12-20 | Magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32240688A JPH02166607A (en) | 1988-12-20 | 1988-12-20 | Magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02166607A true JPH02166607A (en) | 1990-06-27 |
Family
ID=18143310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32240688A Pending JPH02166607A (en) | 1988-12-20 | 1988-12-20 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02166607A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0518649A2 (en) * | 1991-06-11 | 1992-12-16 | Matsushita Electric Industrial Co., Ltd. | Bi-directional tape recording/reproducing device |
| US5436780A (en) * | 1991-06-03 | 1995-07-25 | Matsushita Electric Industrial Co., Ltd. | Thin film magnetic head device |
| EP0773534A3 (en) * | 1995-11-13 | 1997-05-28 | Eastman Kodak Company | Patterned multi-track thin film heads for image area record/reproduce on magnetics-on-film |
-
1988
- 1988-12-20 JP JP32240688A patent/JPH02166607A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5436780A (en) * | 1991-06-03 | 1995-07-25 | Matsushita Electric Industrial Co., Ltd. | Thin film magnetic head device |
| EP0518649A2 (en) * | 1991-06-11 | 1992-12-16 | Matsushita Electric Industrial Co., Ltd. | Bi-directional tape recording/reproducing device |
| EP0518649A3 (en) * | 1991-06-11 | 1994-04-27 | Matsushita Electric Ind Co Ltd | |
| EP0773534A3 (en) * | 1995-11-13 | 1997-05-28 | Eastman Kodak Company | Patterned multi-track thin film heads for image area record/reproduce on magnetics-on-film |
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