JPS627602B2 - - Google Patents
Info
- Publication number
- JPS627602B2 JPS627602B2 JP53095321A JP9532178A JPS627602B2 JP S627602 B2 JPS627602 B2 JP S627602B2 JP 53095321 A JP53095321 A JP 53095321A JP 9532178 A JP9532178 A JP 9532178A JP S627602 B2 JPS627602 B2 JP S627602B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic head
- control means
- head element
- same
- recording medium
- 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
- 238000006243 chemical reaction Methods 0.000 claims 2
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
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
- G11B5/584—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 for track following on tapes
- G11B5/588—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 for track following on tapes by controlling the position of the rotating heads
- G11B5/592—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 for track following on tapes by controlling the position of the rotating heads using bimorph elements supporting the heads
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Description
【発明の詳細な説明】
本発明は、回転２ヘツド型の映像信号記録再生
装置に用いる磁気ヘツド装置に関するもので、特
に記録媒体（磁気テープ）の速度を正常速度に比
べて遅く、または、停止させて再生画像を得る場
合、隣接したトラツクを交互に再生するために生
じる画面のちらつきをなくすとともに、磁気テー
プの速度を正常速度に比べ速くした場合、特に偶
数倍速にしたときに、再生するトラツクの間隔の
違いにより生じる画面上の不自然な動きをなくす
ことを目的とする。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head device used in a rotating two-head type video signal recording and reproducing device, and in particular, the present invention relates to a magnetic head device used in a rotating two-head type video signal recording and reproducing device. In order to obtain a playback image by adjusting the speed of the magnetic tape, it is possible to eliminate the screen flickering that occurs when adjacent tracks are played back alternately. The purpose is to eliminate unnatural movements on the screen caused by differences in the spacing between.
一般に２ヘツド型ヘリカルスキヤン方式の
VTRにおいては、帯状の磁気テープ上に不連続
に映像信号を記録し、しかも再生時における隣接
トラツクからのクロストークを除去するためアジ
ムス記録方式を採用している。 Generally, a two-head helical scan method is used.
VTRs record video signals discontinuously on a strip-shaped magnetic tape, and use the azimuth recording method to eliminate crosstalk from adjacent tracks during playback.
そのため、テープを停止させて再生する、いわ
ゆるスチル再生の場合、再生ヘツドの走査軌跡は
記録軌跡Ａ，Ｂとは傾斜角が異なり第１図１−２
のようになる。これを良好な画像になるように再
生するためにはヘツドが例えばＡヘツドである場
合には、始まりのヘツド位置はそのままであるが
走査していくにつれて１−３の矢印方向に再生ヘ
ツドを引き戻す必要があり、またＢヘツドの場合
には始点時に１−４の矢印方向に１トラツクピツ
チだけずらしておいて序々に元の位置に戻す操作
が必要となる。以上のような磁気ヘツドの変位方
法としては、例えばチタン酸バリウム磁器のよう
な非常に大きな圧電効果を有する材料を用いて電
気−機械変換器を作り、これを磁気ヘツドの支持
アームとして用い、磁気ヘツドの位置を電気的制
御し、位置決めを行うことが知られている。電気
−機械変換器としては、圧電素子の特質である、
或る方向に電界を加えるとその形状は電界方向に
延びて、これと直角の方向に縮む性質を利用し
て、第２図に示すように電解を介して２枚の圧電
素子は極性の逆の面で貼り合わせる、いわゆるバ
イモルフを構成し、一端を固定し、他端を自由端
にして磁気ヘツドをとりつける。このようにして
バイモルフの電極に所定の電圧を加えることによ
り、磁気ヘツドを正規の位置に位置せしめること
ができる。すなわち第２図ＡおよびＣにおいて圧
電素子板２−１の両側に電極２−２を設けこれを
２枚を貼り合わせてバイモルフ構造にし、固定具
２−３で一端を固定し、他方の先端に磁気ヘツド
２−４を装備し、磁気テープ２−５に接するよう
に設ける。そして端子２−６を基準にして端子２
−７と端子２−８に各々逆極性の電位を与えるこ
とにより、Ｂ図のようにバイモルフが変形し、磁
気ヘツド２−４は磁気ヘツドの回転方向に対して
直角に位置が移動する。したがつてこのバイモル
フに与える電位を適当に選ぶと磁気ヘツド２−４
を所定のトラツクに沿つてトレースさせることが
でき、スチル再生の場合、磁気ヘツドのギヤツプ
方向と磁気テープ上に記録されたトラツクのアジ
ムス角度が一致しないときに生じるノイズを防止
することができる。 Therefore, in the case of so-called still playback, in which the tape is stopped and played back, the scanning locus of the playback head has a different inclination angle than the recording loci A and B, as shown in Figure 1-1-2.
become that way. In order to reproduce this into a good image, if the head is, for example, the A head, the starting head position remains the same, but as it scans, the reproduction head is pulled back in the direction of arrows 1-3. In the case of the B head, it is necessary to shift the track by one track pitch in the direction of arrows 1-4 at the starting point and then gradually return it to the original position. To displace the magnetic head as described above, for example, an electro-mechanical transducer is made using a material with a very large piezoelectric effect, such as barium titanate porcelain, and this is used as a support arm of the magnetic head. It is known to perform positioning by electrically controlling the position of the head. As an electro-mechanical converter, the characteristics of piezoelectric elements are
Utilizing the property that when an electric field is applied in a certain direction, the shape extends in the direction of the electric field and contracts in the direction perpendicular to this, the two piezoelectric elements have opposite polarities through electrolysis, as shown in Figure 2. They are pasted together to form a so-called bimorph, with one end fixed and the other free to attach a magnetic head. By applying a predetermined voltage to the electrodes of the bimorph in this manner, the magnetic head can be positioned at the correct position. That is, in FIGS. 2A and 2C, electrodes 2-2 are provided on both sides of the piezoelectric element plate 2-1, and the two pieces are bonded together to form a bimorph structure, one end is fixed with a fixture 2-3, and the other end is fixed with an electrode 2-2. A magnetic head 2-4 is provided and placed in contact with a magnetic tape 2-5. Then, with terminal 2-6 as a reference, terminal 2
By applying potentials of opposite polarity to terminals -7 and 2-8, the bimorph is deformed as shown in Figure B, and the position of magnetic head 2-4 is moved perpendicular to the direction of rotation of the magnetic head. Therefore, if the potential applied to this bimorph is appropriately selected, the magnetic head 2-4
can be traced along a predetermined track, and in the case of still playback, it is possible to prevent noise that occurs when the gap direction of the magnetic head and the azimuth angle of the track recorded on the magnetic tape do not match.
しかし、このスチル再生の場合２つのヘツドの
アジムス角度は異るため、例えば第１図のA3→
B3→A3→B3……というふうに、ＡトラツクとＢ
トラツクを交互に再生することになるため、画像
が動いているときなどは、約30Hzで画面が振動す
る。そのため画面を見た場合、画面がちらついて
見えるという現象が起こる。 However, in this still playback, the azimuth angles of the two heads are different, so for example A 3 →
B 3 →A 3 →B 3 ...and so on, A track and B
Since tracks are played alternately, the screen vibrates at approximately 30Hz when the image is moving. Therefore, when looking at the screen, a phenomenon occurs in which the screen appears to flicker.
また、テープ速度が正常速度よりも遅い、いわ
ゆるスロー再生の場合は、再生ヘツドはＡトラツ
ク、Ｂトラツクを交互に何回か走査し、順次、次
のＡトラツク、Ｂトラツクを交互に何回か走査す
ることを繰返す、よつてこの場合もスチル再生の
ときと同様、画面がちらつく現象が起こる。 In addition, in the case of so-called slow playback, where the tape speed is slower than the normal speed, the playback head alternately scans the A track and B track several times, and then scans the next A track and B track alternately several times. Scanning is repeated, and in this case as well, the screen flickers, similar to when playing stills.
前記画面のちらつきをなくすためには、スチル
再生、及びスロー再生の場合、同じトラツクすな
わちＡトラツクのみ、またはＢトラツクのみを何
回か続けて再生するフイールド再生にすることが
必要である。 In order to eliminate flickering on the screen, in the case of still playback and slow playback, it is necessary to use field playback in which the same track, ie, only the A track or only the B track, is played back several times in succession.
テープ速度が正常速度よりも速い、いわゆる、
倍速再生の場合、例えば２倍速再生のとき、再生
ヘツドは第１図の１−５，１−６の矢印方向に走
査する。これを良好な画像になるように再生する
ためには１−５をＡヘツドが走査する場合１−７
の矢印方向に１トラツクピツチだけずらしておい
て序々に元の位置に引き戻す操作が必要であり、
１−６をＢヘツドが走査する場合、始まりのヘツ
ド位置はそのままであるが走査していくにつれて
１−８の矢印方向に再生ヘツドを引き戻す必要が
ある。この場合の磁気ヘツドの変位方法は前述の
方法と同様である。しかし、この場合、再生ヘツ
ドはA1→B2→A3→B4……といつた具合に再生し
ていくため再生するトラツクの間隔が異なり、画
面として見た場合、不自然な倍速再生になつてし
まうことがある。 The tape speed is faster than the normal speed, so-called
In the case of double speed playback, for example, double speed playback, the playback head scans in the directions of arrows 1-5 and 1-6 in FIG. In order to reproduce this as a good image, if the A head scans 1-5, 1-7
It is necessary to shift it one track pitch in the direction of the arrow and then gradually pull it back to its original position.
When the B head scans 1-6, the starting head position remains the same, but as it scans, it is necessary to pull the reproducing head back in the direction of the arrow 1-8. The method of displacing the magnetic head in this case is the same as the method described above. However, in this case, since the playback head plays in the order of A 1 → B 2 → A 3 → B 4 ..., the intervals between the tracks to be played are different, and when viewed as a screen, the playback at double speed is unnatural. Sometimes I get used to it.
本発明は片側にアジムス角度が異る２つのヘツ
ドを設けることによりこのような問題点を解決せ
んとするものであり、以下その一実施例を説明す
る。 The present invention attempts to solve these problems by providing two heads with different azimuth angles on one side, and one embodiment thereof will be described below.
第３図および第４図に、本発明の一実施例にお
ける磁気ヘツド装置を示す、３−１，３−２は回
転シリンダー上に付けられたヘツドで、３−１が
Ａヘツド、３−２がＢヘツドである。Ａヘツド３
−１には或るアジムス角をもつたヘツド素子が一
つ取り付けられており、一方Ｂヘツド３−２に
は、Ａヘツドと同じアジムス角をもつたヘツド素
子と、異なるアジムス角をもつたヘツド素子が一
つずつ、計２個のヘツド素子が取り付けられてい
る。第４図Ａは前記Ｂヘツドの一例を示すもの
で、構成は第２図に示すヘツドとほとんど同じで
あり、３−２は圧電素子、３−３は電極、３−４
は固定具、３−５，３−６，３−７は端子、３−
１Ａ，３−１Ｂはそれぞれアジムス角度の異るヘ
ツド素子である。圧電素子の下側にもヘツドが取
り付けられているのが特徴である。第４図Ｂにテ
ープ接触面から見た、２個のヘツドの相対関係を
示している。Ｃは本発明の他の実施例であり、圧
電素子の上側にのみ（または下側のみ）にアジム
ス角度の異なる２個のヘツド素子３−１Ａ，３−
１Ｂを設けたものである。この場合ヘツドは重ね
ても、また、水平にずらせて設けても良いことは
言うまでもない。上記のような磁気ヘツドを用い
ることにより、圧電素子に加える偏向電圧を制御
してやれば、磁気ヘツドとテープの相対位置を制
御することができ、同じアジムス角度のヘツドの
みを使うことによつてそれに合致したトラツクの
みを再生できるためスチル再生の場合、フイール
ドスチルが可能であり、画面のちらつきを防止す
ることができる。また、スロー再生、偶数倍速時
には、例えばＡトラツクのみを選んで再生するこ
とができる。 3 and 4 show a magnetic head device according to an embodiment of the present invention, 3-1 and 3-2 are heads mounted on a rotating cylinder, 3-1 is an A head, and 3-2 is a head mounted on a rotary cylinder. is the B head. A head 3
One head element with a certain azimuth angle is attached to the head B-1, while a head element with the same azimuth angle as the A head and a head element with a different azimuth angle are attached to the B head 3-2. A total of two head elements are attached, one element for each element. FIG. 4A shows an example of the B head, and the configuration is almost the same as the head shown in FIG. 2, with 3-2 a piezoelectric element, 3-3 an electrode, and 3-4
is a fixture, 3-5, 3-6, 3-7 are terminals, 3-
1A and 3-1B are head elements having different azimuth angles. The feature is that a head is also attached to the bottom of the piezoelectric element. FIG. 4B shows the relative relationship of the two heads as viewed from the tape contact surface. C is another embodiment of the present invention, in which two head elements 3-1A and 3-1 with different azimuth angles are provided only on the upper side (or only on the lower side) of the piezoelectric element.
1B is provided. In this case, it goes without saying that the heads may be placed one on top of the other or may be provided horizontally offset. By using a magnetic head like the one described above and controlling the deflection voltage applied to the piezoelectric element, it is possible to control the relative position of the magnetic head and the tape, and by using only heads with the same azimuth angle, it is possible to match the deflection voltage applied to the piezoelectric element. Since only the recorded tracks can be played back, field still playback is possible in the case of still playback, and flickering on the screen can be prevented. Furthermore, during slow playback or even-numbered speed, only the A track can be selected and played back, for example.
以上のように本発明によればテープが停止して
いるスチル再生時には同じアジムス角度の２つの
ヘツド素子を交互にテープと接触でき、一つのＡ
トラツクのみを連続して再生できるため、画像が
動いている途中であつても、ちらつきのない良好
な再生画像が得られる。 As described above, according to the present invention, during still playback when the tape is stopped, two head elements having the same azimuth angle can be brought into contact with the tape alternately.
Since only the tracks can be reproduced continuously, a good reproduced image without flickering can be obtained even when the image is in motion.
またテープが正常速度よりも遅いスロー再生時
においては、例えば半速スロー再生のときは、Ａ
トラツクを４回再生し、Ｂトラツクをとばして次
のＡトラツクを４回再生するといつたことを、順
次、繰返して行うことができるため、スチル再生
時と同様、ちらつきのない再生画像を得ることが
できる。この場合、画像がきわめてゆつくり動い
ているときは分解写真のように見える。 Also, when the tape is played back in slow motion at a speed slower than the normal speed, for example, in half-speed slow playback, the A
Since it is possible to repeat the process of playing a track four times, skipping the B track, and playing the next A track four times in sequence, it is possible to obtain a flicker-free playback image just like when playing stills. I can do it. In this case, when the image moves very slowly, it looks like an exploded photograph.
またテープが正常速度より速い倍速再生の場
合、特に偶数倍速時においては、例えば、第１図
の１−５の軌跡はA1トラツクへ、１−６の軌跡
はA2トラツクへとずらして再生することがで
き、再生するトラツクの間隔を等しくできるの
で、きわめて正常な倍速再生を行うことができ
る。 Also, when the tape is played back at a double speed that is faster than the normal speed, especially when the tape is played at an even number of speeds, for example, the trajectory 1-5 in Figure 1 is shifted to the A1 track, and the trajectory 1-6 is played back to the A2 track. Since the intervals between the tracks to be played back can be made equal, extremely normal double speed playback can be performed.
第１図は、スチル再生時並びに２倍速再生時に
おけるアジムス記録トラツク上の再生ヘツドの軌
跡を示す図、第２図Ａ，Ｂ，Ｃは、圧電素子を用
いた従来の磁気ヘツド装置を示す図、第３図Ａは
本発明の一実施例における磁気ヘツド装置の平面
図、同Ｂは同断面図、第４図Ａは本発明同磁気ヘ
ツド装置の具体構成例を示す断面図、同Ｂは同正
面図、同Ｃは他の実施例の正面図である。
３−１Ａ，３−１Ｂ……ヘツド素子、３−２…
…圧電素子、３−３……電極、３−４……固定
具。
FIG. 1 is a diagram showing the trajectory of the reproducing head on an azimuth recording track during still playback and double speed playback, and FIGS. 2A, B, and C are diagrams showing a conventional magnetic head device using piezoelectric elements. , FIG. 3A is a plan view of a magnetic head device according to an embodiment of the present invention, FIG. 3B is a sectional view thereof, FIG. The same front view, and the same figure C is a front view of another example. 3-1A, 3-1B...Head element, 3-2...
...Piezoelectric element, 3-3... Electrode, 3-4... Fixture.
Claims (1)
生装置に使用される磁気ヘツド装置であつて、一
端を固定し、他端を自由端とした第１及び第２の
電気−機械変換素子と、前記第１の電気−機械変
換素子の自由端に配された第１の磁気ヘツド素子
と、前記第２の電気−機械変換素子の自由端には
近接して配され前記第１の磁気ヘツド素子と同一
のアジムス角度を有する第２の磁気ヘツド素子
と、前記第１の磁気ヘツド素子と異なるアジムス
角度を有する第３の磁気ヘツド素子とを有し、記
録媒体の走行速度を制御する速度制御手段と、前
記第１及び第２の電気−機械変換素子に電圧を印
加して前記第１及び第２の磁気ヘツド素子が前記
記録媒体の第１の磁気ヘツド素子と同一のアジム
ス角度で記録された記録トラツク上を走査するよ
うに制御する走査制御手段とを有することを特徴
とする磁気ヘツド装置。 ２ 速度制御手段が記録媒体を停止させる停止手
段からなり、走査制御手段が第１及び第２の電気
−機械変換素子に電圧を印加して前記第１及び第
２の磁気ヘツド素子を前記停止手段により停止さ
れた記録媒体の第１の磁気ヘツド素子と同一のア
ジムス角度で記録された同一の記録トラツク上を
走査するように制御する制御手段からなることを
特徴とする特許請求の範囲第１項記載の磁気ヘツ
ド装置。 ３ 速度制御手段が記録媒体の移動速度を規準速
度より遅く移動させる低速制御手段からなり、走
査制御手段が第１及び第２の電気−機械変換素子
に電圧を印加して第１及び第２の磁気ヘツド素子
が前記低速制御手段により低速で移動する記録媒
体の第１の磁気ヘツド素子と同一アジムス角度で
記録された同一の記録トラツク上を走査すると共
に、順次、前記記録トラツクと並設され同一アジ
ムス角度で記録された記録トラツク上を走査する
ように制御する制御手段からなることを特徴とす
る特許請求の範囲第１項記載の磁気ヘツド装置。 ４ 速度制御手段が記録媒体の移動速度を規準速
度より速く移動させる高速制御手段からなり、走
査制御手段が第１及び第２の電気−機械変換素子
に電圧を印加して、第１及び第２の磁気ヘツド素
子が前記高速制御手段により高速で移動する記録
媒体の第１の磁気ヘツド素子と同一アジムス角度
で記録された同一の記録トラツク上を走査すると
共に、順次、前記記録トラツクと並設され同一ア
ジムス角度で記録された記録トラツク上を走査す
るように制御する制御手段からなることを特徴と
する特許請求の範囲第１項記載の磁気ヘツド装
置。[Scope of Claims] 1. A magnetic head device used in a video signal recording and reproducing device that performs tilted azimuth recording, which comprises first and second electrical machines with one end fixed and the other end free. a first magnetic head element disposed at the free end of the first electro-mechanical transducer; and a first magnetic head element disposed close to the free end of the second electro-mechanical transducer; a second magnetic head element having the same azimuth angle as the magnetic head element; and a third magnetic head element having an azimuth angle different from that of the first magnetic head element, and controlling the running speed of the recording medium. a speed control means for applying a voltage to the first and second electro-mechanical transducers so that the first and second magnetic head elements have the same azimuth angle as the first magnetic head element of the recording medium; 1. A magnetic head device comprising: a scanning control means for controlling scanning over a recording track recorded by a magnetic head; 2. The speed control means includes a stop means for stopping the recording medium, and the scan control means applies a voltage to the first and second electro-mechanical transducers to cause the first and second magnetic head elements to stop. Claim 1 further comprising a control means for controlling the first magnetic head element of the recording medium to scan on the same recording track recorded at the same azimuth angle as the first magnetic head element of the recording medium stopped by the first magnetic head element. The magnetic head device described. 3. The speed control means includes a low speed control means for moving the recording medium at a speed slower than the reference speed, and the scan control means applies voltage to the first and second electro-mechanical conversion elements to convert the first and second electromechanical transducers. The magnetic head element scans over the same recording track recorded at the same azimuth angle as the first magnetic head element of the recording medium moving at low speed by the low speed control means, and sequentially scans the same recording track which is parallel to the recording track and is the same. 2. The magnetic head device according to claim 1, further comprising a control means for controlling the recording track to be scanned at an azimuth angle. 4. The speed control means includes high-speed control means for moving the recording medium faster than the standard speed, and the scan control means applies voltage to the first and second electro-mechanical conversion elements to The first magnetic head element scans the same recording track recorded at the same azimuth angle as the first magnetic head element of the recording medium moving at high speed by the high-speed control means, and is sequentially arranged in parallel with the recording track. 2. The magnetic head device according to claim 1, further comprising a control means for controlling the recording track to be scanned at the same azimuth angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9532178A JPS5522284A (en) | 1978-08-03 | 1978-08-03 | Magnetic head device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9532178A JPS5522284A (en) | 1978-08-03 | 1978-08-03 | Magnetic head device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5522284A JPS5522284A (en) | 1980-02-16 |
| JPS627602B2 true JPS627602B2 (en) | 1987-02-18 |
Family
ID=14134469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9532178A Granted JPS5522284A (en) | 1978-08-03 | 1978-08-03 | Magnetic head device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5522284A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01113801U (en) * | 1987-09-19 | 1989-07-31 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57111188A (en) * | 1980-12-27 | 1982-07-10 | Canon Inc | Magnetic recorder and reproducer |
| JPS60143106A (en) * | 1983-12-29 | 1985-07-29 | Bridgestone Corp | Pneumatic radial tire for heavy load |
| JPS61239788A (en) * | 1985-04-16 | 1986-10-25 | Nec Kansai Ltd | Vtr head structure |
| JPH0391113A (en) * | 1989-09-01 | 1991-04-16 | Hitachi Ltd | Rotary magnetic head device and magnetic recording and reproducing device using the same |
-
1978
- 1978-08-03 JP JP9532178A patent/JPS5522284A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01113801U (en) * | 1987-09-19 | 1989-07-31 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5522284A (en) | 1980-02-16 |
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