JP2780176B2 - Magnetic head - Google Patents
Magnetic headInfo
- Publication number
- JP2780176B2 JP2780176B2 JP63206741A JP20674188A JP2780176B2 JP 2780176 B2 JP2780176 B2 JP 2780176B2 JP 63206741 A JP63206741 A JP 63206741A JP 20674188 A JP20674188 A JP 20674188A JP 2780176 B2 JP2780176 B2 JP 2780176B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic head
- gimbal
- recording
- core
- flying height
- 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 - Fee Related
Links
Classifications
-
- 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
- G11B5/58—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 with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/60—Fluid-dynamic spacing of heads from record-carriers
- G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion
-
- 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
- G11B5/54—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 with provision for moving the head into or out of its operative position or across tracks
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
- Supporting Of Heads In Record-Carrier Devices (AREA)
Description
【発明の詳細な説明】 〔概要〕 磁気ディスク装置等に用いられる磁気ヘッドに関し、 磁気ヘッドと媒体間の浮上マージンを増し、ヘッドク
ラッシュを回避するような磁気ヘッドを提供することを
目的とし、 スプリングアームの一端にバンジルを介し取付けられ
た磁気ヘッドであって、ジンバルと磁気ヘッドとの熱膨
張率の差による変形を生じさせるように、前記ジンバル
に少なくとも加熱手段を備え、再生／記録時には前記加
熱手段にて加熱し、媒体からの磁気ヘッドの浮上量を非
加熱状態より小さくさせるように構成する。DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a magnetic head used in a magnetic disk drive or the like, which aims to provide a magnetic head that increases a flying margin between the magnetic head and a medium and avoids a head crash. A magnetic head attached to one end of an arm via a bandil, wherein the gimbal is provided with at least a heating means so as to cause deformation due to a difference in coefficient of thermal expansion between the gimbal and the magnetic head; The magnetic head is heated by a means so that the flying height of the magnetic head from the medium is made smaller than in the non-heated state.
又、ジンバルに前記加熱手段と更に冷却手段とを備
え、再生／記録時には前記加熱手段にて加熱し、媒体か
らの磁気ヘッドの浮上量を非加熱状態より小さくさせ、
再生／記録しない時には前記冷却手段により冷却して、
該浮上量を非加熱状態より大きくさせるように構成す
る。Further, the gimbal is provided with the heating means and further a cooling means, and is heated by the heating means at the time of reproduction / recording, so that the flying height of the magnetic head from the medium is made smaller than the non-heated state.
When playback / recording is not performed, cooling is performed by the cooling means.
The flying height is configured to be larger than in the non-heated state.
本発明は、磁気ディスク装置等に用いられる磁気ヘッ
ドに関する。The present invention relates to a magnetic head used for a magnetic disk device and the like.
磁気ディスク装置は大記憶容量、高速データ転送速度
を実現するために、現在ではすべて浮上型磁気ヘッドが
用いられている。In order to realize a large storage capacity and a high data transfer speed, all magnetic disk devices use a floating magnetic head at present.
浮上型磁気ヘッドは、記録媒体が高速で相対的に移動
する時、空気の粘性によって発生する動圧を利用して浮
上し、磁気ヘッドと記録媒体の間に微小な隙間を保ち、
磁気ヘッドの読取部の媒体の情報を再生／記録する。The floating magnetic head floats using the dynamic pressure generated by the viscosity of air when the recording medium moves relatively at high speed, keeping a small gap between the magnetic head and the recording medium,
Reproduces / records information on the medium in the reading section of the magnetic head.
最近は高密度記録化に伴い、磁気ヘッドの浮上隙間が
益々小さくなり、磁気ヘッドと媒体間の浮上マージンが
少なくなりヘッドクラッシュを起こし易い。そのため浮
上マージンの大きい磁気ヘッドが要求されている。Recently, as the recording density has increased, the flying gap of the magnetic head has become smaller and smaller, and the flying margin between the magnetic head and the medium has been reduced, so that a head crash is likely to occur. Therefore, a magnetic head having a large flying margin is required.
第４図は磁気ディスク装置の概略を説明する図であ
る。FIG. 4 is a diagram schematically illustrating a magnetic disk drive.
図において、密閉容器１内でスピンドル２に保持され
た複数のディスク円板３に対し、磁気ヘッド４は回転軸
５に固定された固定アーム６に、図示しないスプリング
アームを介して取付けられ、ディスク円板３の回転によ
り浮上する構成である。なお、７はスピンドル２を駆動
するモータである。In the figure, a magnetic head 4 is attached to a fixed arm 6 fixed to a rotating shaft 5 via a spring arm (not shown) with respect to a plurality of disk disks 3 held by a spindle 2 in a closed container 1. It is configured to float by the rotation of the disk 3. Reference numeral 7 denotes a motor for driving the spindle 2.
第５図（イ）〜（ハ）は従来の磁気ヘッドを保持する
スプリングアーム構造図で、（イ）は平面図、（ロ）は
正面図、（ハ）は磁気ヘッド部の詳細図である。5A to 5C are structural views of a spring arm for holding a conventional magnetic head, wherein FIG. 5A is a plan view, FIG. 5B is a front view, and FIG. 5C is a detailed view of a magnetic head portion. .
図において、10はスプリングアームで、図示しないキ
ャリッジに固定された固定アーム６に、スペーサ15を介
して取付けられる。磁気ヘッド４はジンバル11を介して
スプリングアーム10に保持される。磁気ヘッド４からリ
ード線12はチューブ13に通して、スプリングアーム面に
あるチューブ押え14で固定してリード線12の動きを押
え、図示しない再生／記録回路へ導いている。なお、15
はスペーサ、16はフランジであり、剛性を得るため両側
をヘッドの取付面と反対面に折曲げて形成する。In the figure, reference numeral 10 denotes a spring arm, which is attached via a spacer 15 to a fixed arm 6 fixed to a carriage (not shown). The magnetic head 4 is held on a spring arm 10 via a gimbal 11. The lead wire 12 from the magnetic head 4 passes through a tube 13 and is fixed by a tube retainer 14 on the spring arm surface to suppress the movement of the lead wire 12 and lead it to a reproducing / recording circuit (not shown). In addition, 15
Is a spacer, and 16 is a flange, which is formed by bending both sides to the surface opposite to the head mounting surface in order to obtain rigidity.
磁気ヘッド４はコンタクト・スタート・ストップ（CS
S）型であり、ディスク円板３に接している磁気ヘッド
４は、ディスク円板３の回転より第５図（ハ）のように
浮上し再生／記録を行い、回転停止により降下して止ま
る。磁気ヘッド４の浮上量Ａは0.2〜0.3μｍと僅かであ
り、今後益々小さくなる傾向にある。The magnetic head 4 has a contact start / stop (CS
The magnetic head 4 which is of the S) type and is in contact with the disk 3 floats and performs reproduction / recording as shown in FIG. . The flying height A of the magnetic head 4 is as small as 0.2 to 0.3 μm, and tends to be smaller in the future.
そのため、磁気ヘッド４の浮上量Ａが微小で、磁気ヘ
ッド４と媒体間の浮上マージンが少ないことより、ゴ
ミ、振動等によりヘッドクラッシュが起こり易い問題が
あった。For this reason, the flying height A of the magnetic head 4 is very small, and the flying margin between the magnetic head 4 and the medium is small.
そこで、本発明は磁気ヘッドと媒体間の浮上マージン
を増し、ヘッドクラッシュを回避するような磁気ヘッド
を提供することを目的とする。Accordingly, it is an object of the present invention to provide a magnetic head that increases the flying margin between the magnetic head and the medium and avoids a head crash.
前記問題点は、第１図（イ）（ロ）に示されるように
スプリングアーム10の一端にジンバル11を介し取付けら
れた磁気ヘッド４であって、 ジンバル11と磁気ヘッド４との熱膨張率の差による変
形を生じさせるように、前記ジンバル11に少なくとも加
熱手段18を備え、再生／記録時には前記加熱手段18にて
加熱し、媒体からの磁気ヘッド４の浮上量を非加熱状態
より小さくさせる磁気ヘッド４により解決される。The problem is the magnetic head 4 attached to one end of the spring arm 10 via the gimbal 11 as shown in FIGS. 1 (a) and 1 (b), and the coefficient of thermal expansion between the gimbal 11 and the magnetic head 4 The gimbal 11 is provided with at least a heating means 18 so as to cause deformation due to the difference between the magnetic head 4 and the heating means 18 during the reproduction / recording so that the flying height of the magnetic head 4 from the medium is made smaller than that in the non-heated state. The problem is solved by the magnetic head 4.
又、ジンバル11に前記加熱手段18と更に冷却手段17と
を備え、再生／記録時には前記加熱手段18にて加熱、媒
体３からの磁気ヘッド４の浮上量を非加熱状態より小さ
くさせ、再生／記録しない時には前記冷却手段17により
冷却して、該浮上量を非加熱状態より大きくさせる磁気
ヘッド４により達成される。Further, the gimbal 11 is provided with the heating means 18 and the cooling means 17. During reproduction / recording, the heating means 18 heats the magnetic head 4 from the medium 3 so that the flying height of the magnetic head 4 becomes smaller than that in the non-heated state. When the recording is not performed, the magnetic head 4 is cooled by the cooling means 17 to make the flying height larger than that in the non-heated state.
コアスライダ19にコア20を固定してなる磁気ヘッド４
は、ジンバル11に接着されている。本発明は、ジンバル
11（金属材）とコアスライダ19（非金属材或いは焼成金
属材）及びコア20（非金属材或いは焼成金属材）の熱膨
張率の差を利用したものであり、先ず、加熱も冷却も行
わない状態にて磁気ヘッドは、第３図（イ）の如く、媒
体３に対しＡの浮上量となるとする。Magnetic head 4 having core 20 fixed to core slider 19
Is bonded to the gimbal 11. The present invention provides a gimbal
This utilizes the difference in the coefficient of thermal expansion between 11 (metal material), the core slider 19 (non-metal material or fired metal material) and the core 20 (non-metal material or fired metal material). In this state, the magnetic head has a flying height of A with respect to the medium 3 as shown in FIG.
そこで、加熱手段18によりジンバル11を加熱し高温に
すると、熱膨張率の大きいジンバル11が伸び、第３図
（ロ）のように、コアスライダ19及びコア20が変形させ
られ、コア20のR/Wギャップ21は、第３図（イ）の状態
より媒体３に近づき、浮上量A1が小さくなる。Then, when the gimbal 11 is heated by the heating means 18 to a high temperature, the gimbal 11 having a large coefficient of thermal expansion is extended, and the core slider 19 and the core 20 are deformed as shown in FIG. / W gap 21 approaches the medium 3 from the state of FIG. 3 (b), the flying height a 1 is reduced.
逆に、冷却手段17により冷却して低温にすると、第３
図（ハ）のように、ジンバル11は縮み、コア20のR/Wギ
ャップが媒体３から遠ざかる方向に変形し、第３図
（イ）及び（ロ）の何れよりも媒体３との浮上量A2が大
きくなる。Conversely, if the temperature is lowered by cooling by the cooling means 17,
As shown in FIG. 3C, the gimbal 11 shrinks, the R / W gap of the core 20 is deformed in a direction away from the medium 3, and the flying height with respect to the medium 3 is higher than in any of FIGS. 3A and 3B. A 2 increases.
なお、ジンバル11を加熱、冷却しない通常状態では、
第３図（イ）のようにコアスライダ19及びコア20が変形
されないので、通常の浮上量Ａである。従って、再生／
記録するときは、ジンバル11を加熱しコア20の浮上量を
小さくし、、再生／記録しないときには、ジンバル11を
冷却してコア20の浮上量を大きくすることにより、高密
度の再生／記録が行えると共に、浮上マージンが大きく
なり、ヘッドクラッシュが回避される。In the normal state where the gimbal 11 is not heated or cooled,
Since the core slider 19 and the core 20 are not deformed as shown in FIG. Therefore, playback /
When recording, the gimbal 11 is heated to reduce the flying height of the core 20, and when not reproducing / recording, by cooling the gimbal 11 to increase the flying height of the core 20, high-density reproduction / recording is achieved. In addition to the above, the flying margin is increased, and a head crash is avoided.
第１図は本発明の一実施例の説明図であり、第２図は
本発明を適用したスプリングアーム構造図である。な
お、全図を通し共通する符号は同一対象物を示す。FIG. 1 is an explanatory view of one embodiment of the present invention, and FIG. 2 is a structural view of a spring arm to which the present invention is applied. Note that the same reference numerals throughout the drawings indicate the same object.
第１図において、スプリングアーム10の一端にジンバ
ル11を溶接し、該ジンバル11に磁気ヘッド４を接着する
（磁気ヘッド４のコアスライダ19はジンバル11のダボ22
と反対側で、スリット22′で区切られた中央部Ｂに接着
され、コア20はジンバル11の先端部Ｃで接着される）。In FIG. 1, a gimbal 11 is welded to one end of a spring arm 10 and a magnetic head 4 is bonded to the gimbal 11 (the core slider 19 of the magnetic head 4 is a dowel 22 of the gimbal 11).
On the other side, the core 20 is bonded to the center portion B separated by the slit 22 ', and the core 20 is bonded to the tip portion C of the gimbal 11).
上記ジンバル11に、ジンバル11を冷却する冷却手段
（冷却パイプ）17と加熱する加熱手段（電熱線）18とを
設ける。実施例では例えば冷却パイプ17をφ0.5mm径の
アルミチューブ、電熱線18をニクロム線φ0.1〜0.2mmを
用い、それをジンバル11に接して図示のように這わせ、
フランジ16の両側の切欠23よりスプリングアーム10の内
側へ入れ、チューブ13と一緒に固定アーム側に導く。な
お、冷却パイプ17は冷却用流体を循環させるように図示
しないポンプに接続され、電熱線18は電源に接続されて
おり、制御部により冷却、加熱のオン、オフが制御され
る構造である。その他の構造は、第５図（イ）（ロ）で
説明したと同様であり、説明は省略する。The gimbal 11 is provided with a cooling means (cooling pipe) 17 for cooling the gimbal 11 and a heating means (heating wire) 18 for heating. In the embodiment, for example, the cooling pipe 17 is an aluminum tube having a diameter of 0.5 mm, the heating wire 18 is a nichrome wire having a diameter of 0.1 to 0.2 mm, and it is crawled in contact with the gimbal 11 as shown in the drawing.
It is inserted into the inside of the spring arm 10 through the notches 23 on both sides of the flange 16 and guided together with the tube 13 to the fixed arm side. The cooling pipe 17 is connected to a pump (not shown) so as to circulate a cooling fluid, the heating wire 18 is connected to a power supply, and the control unit controls cooling and heating on and off. Other structures are the same as those described with reference to FIGS. 5A and 5B, and a description thereof will not be repeated.
磁気ヘッド４はジンバル11に接着されており、本発明
ではジンバル11材とコアスライダ19材の膨張率の差を利
用する。即ち、加熱手段18によりジンバル11を加熱し高
温にすると、ジンバル11はコアスライダ19より膨張率が
大きいので、ジンバル11が伸び第３図（ロ）のようにコ
アスライダ19が変形する。この結果、コア20のR/Wギャ
ップ21が媒体３に近ずき、浮上量A1が小さくなる。逆
に、冷却手段によりジンバル11を冷却すると、ジンバル
11が縮むので第３図（ハ）のようにコアスライダ19が変
形する。この結果、コア20のR/Wギャップ21が媒体３か
ら遠ざかり、浮上量A2が大きくなる。The magnetic head 4 is adhered to the gimbal 11, and in the present invention, the difference in expansion coefficient between the gimbal 11 and the core slider 19 is used. That is, when the gimbal 11 is heated to a high temperature by the heating means 18, the gimbal 11 has a larger expansion coefficient than the core slider 19, so that the gimbal 11 expands and the core slider 19 is deformed as shown in FIG. As a result, R / W gap 21 of core 20 Ki not a close to medium 3, the flying height A 1 is reduced. Conversely, when the gimbal 11 is cooled by the cooling means,
Since 11 contracts, the core slider 19 is deformed as shown in FIG. As a result, R / W gap 21 of the core 20 away from the medium 3, the flying height A 2 becomes large.
なお、ジンバル11を加熱、冷却しない通常状態では、
コアスライダ19が変形のないので第３図（イ）のような
通常の浮上量Ａが得られる。In the normal state where the gimbal 11 is not heated or cooled,
Since the core slider 19 is not deformed, a normal flying height A as shown in FIG.
従って、再生／記録するときは、ジンバル11を加熱し
コア20の浮上量を小さくし高密度の再生／記録を行い、
再生／記録しないときは、ジンバル11を冷却しコア20の
浮上量を大きくすることにより大幅な浮上マージンを確
保することができる。これにより磁気ヘッドは低浮上で
再生／記録でき、再生／記録しない時は高浮上とするこ
とにより、ヘッドクラッシュが回避され高密度な再生／
記録を可能にする。Therefore, when reproducing / recording, the gimbal 11 is heated to reduce the flying height of the core 20 and perform high-density reproduction / recording.
When reproduction / recording is not performed, a large floating margin can be secured by cooling the gimbal 11 and increasing the floating amount of the core 20. As a result, the magnetic head can be reproduced / recorded with a low flying height, and when the reproducing / recording is not performed, the magnetic head is made to have a high flying height.
Enable recording.
以上説明したように本発明によれば、高温時に再生／
記録し、リードライトしない時は常温又は低温にするこ
とにより大幅な浮上マージンを確保することがてき、ヘ
ッドクラッシュ防止を寄与するところが大きい。As described above, according to the present invention, reproduction /
When recording and reading / writing are not performed, a large flying margin can be secured by setting the temperature to room temperature or low temperature, which greatly contributes to prevention of head crash.
第１図（イ）（ロ）は本発明の一実施例の説明する図、 第２図（イ）〜（ハ）は本発明を適用したスプリングア
ーム構造図、 第３図（イ）〜（ハ）は本発明の温度変化時のコア変形
状態図、 第４図は磁気ディスク装置の概略を説明する図、 第５図（イ）〜（ハ）は従来の磁気ヘッドを保持するス
プリングアーム構造図である。 図において、 ４は磁気ヘッド、 10はスプリングアーム、 11はジンバル、 17は冷却パイプ（冷却手段）、 19はコアスライダ、 20はコア、 21はR/Wギャップ、 22はダボ、 23は切欠、 24は変形領域を示す。FIGS. 1 (a) and 1 (b) are views for explaining an embodiment of the present invention, FIGS. 2 (a) to 2 (c) are structural views of a spring arm to which the present invention is applied, and FIGS. FIG. 4C is a diagram showing the state of deformation of the core when the temperature changes according to the present invention. FIG. 4 is a diagram schematically illustrating the magnetic disk drive. FIGS. 5A to 5C are spring arm structures for holding a conventional magnetic head. FIG. In the figure, 4 is a magnetic head, 10 is a spring arm, 11 is a gimbal, 17 is a cooling pipe (cooling means), 19 is a core slider, 20 is a core, 21 is a R / W gap, 22 is a dowel, 23 is a cutout, 24 indicates a deformation area.
Claims (2)
（11）を介し取付けられた磁気ヘッド（４）であって、 ジンバル（11）と磁気ヘッド（４）との熱膨張率の差に
よる変形を生じさせるように、前記ジンバル（11）に加
熱手段（18）を備え、 再生／記録時には前記加熱手段（18）にて加熱し、媒体
（３）からの磁気ヘッド（４）の浮上量を非加熱状態よ
り小さくさせることを特徴とする磁気ヘッド。A magnetic head (4) attached to one end of a spring arm (10) via a gimbal (11), wherein the deformation is caused by a difference in coefficient of thermal expansion between the gimbal (11) and the magnetic head (4). The gimbal (11) is provided with a heating means (18) so that the magnetic head (4) floats from the medium (3) during reproduction / recording. A magnetic head characterized by being smaller than a non-heated state.
（11）を介し取付けられた磁気ヘッド（４）であって、 ジンバル（11）と磁気ヘッド（４）との熱膨張率の差に
よる変形を生じさせるように、前記ジンバル（11）に加
熱手段（18）と冷却手段（17）とを備え、 再生／記録時には前記加熱手段（18）にて加熱し、媒体
（３）からの磁気ヘッド（４）の浮上量を非加熱状態よ
り小さくさせ、 再生／記録しない時には前記冷却手段（17）により冷却
して、該浮上量を非加熱状態より大きくさせることを特
徴とする磁気ヘッド。2. A magnetic head (4) attached to one end of a spring arm (10) via a gimbal (11), wherein the gimbal (11) and the magnetic head (4) are deformed due to a difference in coefficient of thermal expansion. The gimbal (11) is provided with a heating means (18) and a cooling means (17) so as to cause the magnetic head from the medium (3) during reproduction / recording. The magnetic head according to (4), wherein the flying height is made smaller than that in the non-heated state, and when no reproduction / recording is performed, cooling is performed by the cooling means (17) to make the flying height larger than in the non-heated state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63206741A JP2780176B2 (en) | 1988-08-19 | 1988-08-19 | Magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63206741A JP2780176B2 (en) | 1988-08-19 | 1988-08-19 | Magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0254417A JPH0254417A (en) | 1990-02-23 |
| JP2780176B2 true JP2780176B2 (en) | 1998-07-30 |
Family
ID=16528334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63206741A Expired - Fee Related JP2780176B2 (en) | 1988-08-19 | 1988-08-19 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2780176B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5508863A (en) * | 1991-04-10 | 1996-04-16 | Hitachi Metals, Ltd. | Flying-type magnetic head comprising a slider/gimbal connection which suppresses slider height differences |
| JPH0589445A (en) * | 1991-09-27 | 1993-04-09 | Matsushita Electric Ind Co Ltd | Floating type magnetic head |
| JP2960621B2 (en) * | 1992-12-26 | 1999-10-12 | キヤノン株式会社 | Rubbing apparatus, rubbing method, liquid crystal device manufacturing apparatus, and liquid crystal device manufacturing method |
| US7362533B2 (en) | 2004-07-30 | 2008-04-22 | Hitachi Global Storage Technologies Netherlands B.V. | Disk drive with slider burnishing-on-demand |
| JP2013137846A (en) * | 2011-12-28 | 2013-07-11 | Nitto Denko Corp | Suspension board with circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5148318A (en) * | 1974-10-23 | 1976-04-26 | Hitachi Ltd | FUDOGATAJIKI HETSUDO FUDOHOSHIKI |
| JPS62180373U (en) * | 1986-05-07 | 1987-11-16 |
-
1988
- 1988-08-19 JP JP63206741A patent/JP2780176B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0254417A (en) | 1990-02-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |