JPS63168814A - Performance test method for magnetic head to be tested and recorded test magnetic tape - Google Patents
Performance test method for magnetic head to be tested and recorded test magnetic tapeInfo
- Publication number
- JPS63168814A JPS63168814A JP31242986A JP31242986A JPS63168814A JP S63168814 A JPS63168814 A JP S63168814A JP 31242986 A JP31242986 A JP 31242986A JP 31242986 A JP31242986 A JP 31242986A JP S63168814 A JPS63168814 A JP S63168814A
- Authority
- JP
- Japan
- Prior art keywords
- test
- magnetic head
- recorded
- magnetic tape
- azimuth angle
- 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
- 238000012360 testing method Methods 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims description 7
- 238000011056 performance test Methods 0.000 title claims description 5
- 230000010355 oscillation Effects 0.000 abstract description 3
- 238000007796 conventional method Methods 0.000 description 5
- 238000010998 test method Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001720 vestibular Effects 0.000 description 1
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は製作された磁気ヘッドが、所要の再生能力を有
するかどうかをテストする性能試験方法と、当該試験方
法の実施に使用する試験用磁気テープに関する。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a performance test method for testing whether a manufactured magnetic head has the required reproducing ability, and a test method used to carry out the test method. Regarding magnetic tape.
（従来の技術）
従来のこの種性能試験方法は次のようにして実施されて
いる。(Prior Art) This type of conventional performance testing method is carried out as follows.
すなわち、第３図（ａ）の如き記録装置を用い、その記
録用磁気へラドＡによって、試験用磁気テープＢに所定
の試験信号を記録するのであるが、この際上記の記録用
磁気へラドＡの長袖線Ｃと試験用磁気テープＢの走行方
向りに直交する巾方向線Ｅとなす記録角度θ（アジマス
角度）は既知の通り一定に保持される。That is, using a recording device as shown in FIG. 3(a), a predetermined test signal is recorded on the test magnetic tape B by means of the recording magnetic head A. As is known, the recording angle θ (azimuth angle) between the long sleeve line C of A and the width direction line E perpendicular to the running direction of the test magnetic tape B is kept constant.
このようにして得られた記録済試験用磁気テープＢ°を
用い、これを第３図（ｂ）に示す如く、製作された被試
験磁気へラドＦに当接して、矢印Ｇ方向へ走行させ、こ
れにより、当該被試験磁気へラドＦが、記録済試験用磁
気テープＢ°の試験信号につき、どのような再生能力を
発揮するかを検知するのである。Using the thus obtained recorded magnetic test magnetic tape B°, it is brought into contact with the fabricated magnetic tape F to be tested and run in the direction of arrow G, as shown in FIG. 3(b). Through this, it is possible to detect what kind of reproducing ability the magnetic head F under test exhibits with respect to the test signal of the recorded test magnetic tape B°.
ところで、この場合前記した記録用磁気ヘッドＡについ
てのアジマス角度θと、被試験磁気へラドＦについての
アジマス角度が合致したとき、当該試験信号は最大の再
生信号として取り出すことができるが、両アジマス角度
の相差の大きくなるにつれて信号レベレが低下するので
、一般に内角度を合致させ、このときの最高信頼レベル
における再生信号を性能判別の対象としている。By the way, in this case, when the azimuth angle θ of the recording magnetic head A and the azimuth angle of the magnetic head F to be tested match, the test signal can be extracted as the maximum reproduction signal, but if both azimuths Since the signal level decreases as the angular difference increases, the inner angles are generally made to match, and the reproduced signal at the highest reliability level at this time is the target of performance determination.
そこで、上記の如く両アジマス角度を合致させるため手
段として、同図（ｂ）の如き再生試験装置を用い、その
被試験磁気へラドＦを、これが着脱自在である首振機構
Ｈにより、縦軸線０を中心としてθ゛なる所要回転角度
範囲にて往復動させ、５該往復動中にあって、記録用磁
気ヘッドＡのアジマス角度Ｏに、被試験磁気へラドＦの
アジマス角度を合致させるようにし、この時点における
試験信号の再生信号を良否判定の対象としているのであ
る。Therefore, in order to match both azimuth angles as described above, a reproducing test device as shown in FIG. 5. During the reciprocating movement, the azimuth angle of the magnetic head F to be tested is made to match the azimuth angle O of the recording magnetic head A. The reproduced signal of the test signal at this point in time is the target of the quality determination.
ここで因に、再生信号の信号レベル（ｄＢマ）と、アジ
マス角度０に対する被試験磁気へラドＦのアジマス角度
ｄθとの関係は、試験用磁気テープＢの巾（同テープの
トラック巾Ｗ）や試験信号の記録波長によって異なるの
であり、第２図がトラック巾Ｗ＝０．ｔ３ｍｍ、記録波
長が周波数１０ＫＨ２、同上テープの走行速度４．７５
ｃｍ／ｓｅｃである場合における上記関係を表わした図
表で、これによりｄθ＝ＯのときのＰＬに対し、ｄθが
±３０°、±８０’ といった僅かな角度であっても、
その信号レベルが大きく曲線的に低下してしまうことが
理解される。Incidentally, the relationship between the signal level (dB) of the reproduced signal and the azimuth angle dθ of the magnetic head F under test with respect to the azimuth angle 0 is the width of the test magnetic tape B (track width W of the same tape). Figure 2 shows the track width W=0. t3mm, recording wavelength is frequency 10KH2, running speed of the same tape is 4.75
This is a chart showing the above relationship in the case of cm/sec. This shows that even if dθ is a small angle such as ±30° or ±80' with respect to PL when dθ=O,
It is understood that the signal level drops significantly and in a curved manner.
このため、−上記従来法によるときは、これを実施する
ために用いられる再生試験装置中に、どうしても被試験
磁気ヘッドＦのアジマス角度変化手段である首振機構を
組込んでおかねばならないこととなり、このため当該試
験装置が可成り高価につき、また故障もおこしかねない
こととなるだけでなく、以下の如き諸難点を指摘するこ
とができる。For this reason, - when using the above conventional method, it is necessary to incorporate a swinging mechanism, which is a means for changing the azimuth angle of the magnetic head F under test, into the reproduction test equipment used to carry out the test. For this reason, the test equipment is quite expensive, and not only is there a possibility of failure, but also the following problems can be pointed out.
（イ）上記首振機構Ｈは、多数の製品につきテストの都
度頻繁に被試験磁気へラドＦを着脱しなければならない
ので、可成り複雑なアジマス角度の変化機構に、耐久性
と高精度との両立を強いられることとなるが、これを満
足させることが極めて難事となってくること。(b) The above-mentioned oscillation mechanism H requires a fairly complicated azimuth angle changing mechanism to be durable and highly accurate, as it is necessary to frequently attach and detach the rad F to the magnetic field under test each time a test is performed for a large number of products. However, it will be extremely difficult to satisfy both of these requirements.
（ロ）第３図（ｂ）に示されている通り、一般に被試験
磁気へラドＦには、テープガイドＴＧ、ＴＧ’が二対だ
け設けられ、この間を記録済試験用磁気テープＢ°が走
行することとなるから、前記首振機構Ｈによる被試験磁
気へラドＦの回動によって、当該磁気テープＢ′の両端
縁す、ｂがテープガイドＴＧ、ＴＧ’と摺接し、これに
より同上磁気テープＢ′が変形してしまうこととなるの
であって、この結果正確な性能試験を行なうことが、極
めて難しくなってしまうこと。(b) As shown in Fig. 3(b), generally only two pairs of tape guides TG and TG' are provided on the magnetic head F to be tested, and the recorded test magnetic tape B° is inserted between them. Since the magnetic tape to be tested F is rotated by the swinging mechanism H, both ends of the magnetic tape B' are brought into sliding contact with the tape guides TG and TG', and as a result, the same magnetic tape as described above is moved. The tape B' would be deformed, and as a result, it would be extremely difficult to conduct accurate performance tests.
（ハ）カセットオーデオの場合にあっては、録音済試験
用磁気テープＢ′と被試験磁気へラドＦとの密着性をよ
くしなければならないため、同上磁気ヘッドＦ上に当該
磁気テープＢ°を押圧するため、既知の如く図示しない
テープパッドを使用しているが、従来法ではアジマス角
度を変化させるため、前記の如く当該磁気テープＢ′も
変動することとなり、この結果同上磁気テープＢ′が被
試験磁気へラドＦの表面に吸着を起してしまうこともあ
り、この場合には同テープＢ′の走行障害を起すことに
もなること。(c) In the case of cassette audio, the adhesion between the recorded test magnetic tape B' and the magnetic head F to be tested must be good, so the magnetic tape B° is placed on the same magnetic head F. As is known, a tape pad (not shown) is used to press the magnetic tape B'. However, in the conventional method, the azimuth angle is changed, so the magnetic tape B' also changes as described above. As a result, the magnetic tape B' may be attracted to the surface of the magnetic tape F to be tested, and in this case, it may cause trouble in running the tape B'.
（ニ）上記の通り、録音済試験用磁気テープＢ°が首振
機構Ｈによって、アジマス角度の変化に伴ない変動する
から、この際当該磁気テープＢ′の巾方向中央部分のト
ラックは、上記変動によっても。(d) As mentioned above, since the recorded test magnetic tape B° fluctuates as the azimuth angle changes due to the oscillation mechanism H, at this time, the track in the widthwise center portion of the magnetic tape B' is Also due to fluctuations.
それほど回動しないが、両端部分におけるトラックは上
記アジマス角度の変動によって、可成りの曲率半径で円
運動をすることとなり、これにより当該トラックに変位
（ずれ）が生じ易く、このことで信頼性の高い性能試験
の実現が期待できなくなること。Although it does not rotate much, the track at both ends moves in a circular motion with a considerable radius of curvature due to the fluctuation of the azimuth angle, which tends to cause displacement (slip) in the track, which reduces reliability. It is no longer possible to achieve high performance tests.
（発明が解決しようとする問題点）
本願は上記従来法の欠陥に鑑み検討の結果、その第１発
明にあっては、同上従来手段の発想を転換して、当該試
験方法につき、試験用磁気テープに試験信号を磁気的に
記録しようとする際、記録用磁気ヘッドを首振りさせて
、そのアジマス角度を変化させるようにし、このように
して得られた記録済の試験用磁気テープを用いて被試験
磁気ヘッドＦのアジマス角度は変化させることなく、当
該試験信号の再生を行なうようにして、再生試験装置に
おける首振機構を前庭させ、これにより前記従来法によ
る各種の難点を解消しようとしている。(Problems to be Solved by the Invention) The present application has been studied in view of the deficiencies of the above-mentioned conventional method, and in its first invention, the idea of the above-mentioned conventional means has been changed, and the test method has a magnetic field for testing. When trying to magnetically record a test signal on a tape, the recording magnetic head is oscillated to change its azimuth angle, and the recorded test magnetic tape thus obtained is used to The test signal is reproduced without changing the azimuth angle of the magnetic head F to be tested, and the swinging mechanism in the reproducing test device is moved to the vestibular position, thereby solving the various drawbacks of the conventional method. .
さらに本願第２発明は、上記第１発明に係る方法の実施
に用いられる、前記記録済の試験用磁気テープに関し、
従来の如く一定のアジマス角度を変化させて試験信号を
記録することにより、この試験用磁気テープを用いるこ
とで、テストを行なう側の装置を簡素化するのはもちろ
ん、その操作能率を向上し、かつテスト結果の信頼性を
も大幅に向上させ、かつ当該テープを長期間使用可能と
するのが、その目的である。Furthermore, a second invention of the present application relates to the recorded test magnetic tape used for carrying out the method according to the first invention,
By recording test signals by changing a fixed azimuth angle as in the past, using this test magnetic tape not only simplifies the testing equipment but also improves its operational efficiency. The purpose is to significantly improve the reliability of the test results and to enable the tape to be used for a long period of time.
（問題点を解決するための手段）
本願第１発明に係る方法は、上記の目的を達成するため
、記録用磁気ヘッドと、これにより試験信号が記録され
る試験用磁気テープの走行方向とのなすアジマス角度を
、所望範囲で周期的に変化させることで、当該試験用磁
気テープに、上記試験信号を磁気的に記録した後、この
試験用磁気テープを再生ヘッドとしての被試験磁気ヘッ
ドに、一定のアジマス角度で走行させることにより、当
該試験信号を取り出し、所定信号レベルにおいる当該再
生信号によって、被試験用磁気ヘッドの性能が判定され
るようにしたことを特徴とする被試験磁気ヘッドの性能
試験方法を提供したものであり本願第２発明では、上記
方法の実施するに当り使用して、前記の目的を達成する
ために、記録用磁気ヘッドと、これにより試験信号が記
録される試験用磁気テープの走行方向とのなすアジマス
角度を、上記記録用磁気ヘッドの回動により、所定範囲
にて周期的に変化させることで、上記試験用信号が磁気
的に記録された試験用磁気テープを得たものである。(Means for Solving the Problems) In order to achieve the above-mentioned object, the method according to the first invention of the present application has the following advantages: After magnetically recording the test signal on the test magnetic tape by periodically changing the azimuth angle within a desired range, the test magnetic tape is transferred to the magnetic head under test as a reproducing head. A magnetic head under test, characterized in that the test signal is extracted by running at a constant azimuth angle, and the performance of the magnetic head under test is determined based on the reproduction signal at a predetermined signal level. In the second invention of the present application, in order to achieve the above object by implementing the above method, a recording magnetic head and a test signal are recorded using the recording magnetic head are provided. By periodically changing the azimuth angle formed with the running direction of the test magnetic tape within a predetermined range by rotating the recording magnetic head, a test magnetic tape in which the test signal is magnetically recorded is produced. This is what I got the tape from.
（実 施 例）
本発明を図面によって詳細に説示すれば、第１図に示す
通り、その左側に示された記録装置１と、右側の再生試
験装置２とを用意するが、これらの両装置１．２は、別
体として構成されていても、また一つの試験装置とし一
体に構成されたものであってもよい。(Example) To explain the present invention in detail with reference to drawings, as shown in FIG. 1, a recording device 1 shown on the left side and a reproduction test device 2 on the right side are prepared. 1.2 may be configured as a separate body or may be configured as one test device.
先ず本願第２発明である記録済の試験用磁気テープ３を
、上記記録装置１によって作成するものであるが、同図
中４が記録用磁気ヘッドであり、これは所望機構を具備
させた首振機構５によって、当該磁気へラド４の縦軸心
４ａを中心として、試験用磁気テープ３の走行方向口ｌ
と直交する巾方向基準線４ｂを基準として、左右方向へ
夫々角度αだけ往復回転自在となっている。First, a recorded test magnetic tape 3, which is the second invention of the present application, is created using the recording apparatus 1, and 4 in the figure is a recording magnetic head, which is a neck equipped with a desired mechanism. The vibration mechanism 5 causes the test magnetic tape 3 to move in the running direction around the vertical axis 4a of the magnetic head 4.
With reference to the width direction reference line 4b orthogonal to the width direction reference line 4b, it is reciprocatingly rotatable in the left and right directions by an angle α, respectively.
そこで１本発明では上記記録装置１を稼動させることで
、試験用磁気テープ３に所定の試験信号を磁気的に記録
するのであるが、この際首振機構５による記録用磁気へ
ラド４の回動により、記録角度であるアジマス角度が２
αにわたって変化することになる。Therefore, in the present invention, by operating the recording device 1, a predetermined test signal is magnetically recorded on the test magnetic tape 3. At this time, the recording magnetic tape 4 is rotated by the oscillating mechanism 5. Due to the movement, the azimuth angle, which is the recording angle, is 2.
will vary over α.
このようにして得られた試験信号の記録済である試験用
磁気テープ３が１本願第２発明であり、これを入手して
テスト側で用意した再生試験装置２により被試験用磁気
へラド８をテストしたり、同上装２ｔ２と記録装２ｉ１
とが一体に形成されているのであれば、記録装置ｌから
導出される記録済の試験用磁気テープ３を、そのまま再
生試験装置２へ導入すればよい。The test magnetic tape 3 on which the test signal obtained in this manner has been recorded is the second invention of the present application, and the test magnetic tape 3 is obtained and used as the test magnetic tape 8 by the reproducing test device 2 prepared by the test side. or test the upper case 2t2 and recording device 2i1.
If both are integrally formed, the recorded test magnetic tape 3 taken out from the recording device 1 may be directly introduced into the playback test device 2.
ここで、図中７は被試験磁気ヘッド６が着脱可能とした
装填箇所を示しており、この装填箇所で被試験磁気へラ
ド６は固定であるから、アジマス角度は一定不変となっ
ている。Here, reference numeral 7 in the figure indicates a loading location where the magnetic head 6 to be tested is removably attached, and since the magnetic head 6 to be tested is fixed at this loading location, the azimuth angle remains constant.
この再生試験装置２を稼動させて、記録済の試験用磁気
テープ３を矢印Ｄ２方向に走行させ、これにより同上テ
ープ３の試験信号を当該被試験磁気へラド６により再生
して取り出せば、当該試験信号は、前記のように２αの
範囲にてアジマス角度が変化した条件下で、同上テープ
３に記録されているから、この変化するアジマス角度の
何れかの或角度が、被試験磁気へラド６のアジマス角度
と合致する時点を得ることができ、この際のＰＬである
信号レベルにあって、試験信号に基づく如何なる再生信
号が得られたかを検知することで、当該被試験磁気へラ
ド６の性能を判定することが可能となる。This reproducing test device 2 is operated to run the recorded test magnetic tape 3 in the direction of arrow D2, thereby reproducing the test signal of the same tape 3 by the magnetic tape 6 to be tested and taking it out. Since the test signal is recorded on the same tape 3 under the condition that the azimuth angle changes in the range of 2α as described above, any one of the changing azimuth angles will be rad to the magnetic field under test. By detecting what kind of reproduction signal is obtained based on the test signal at the signal level which is the PL at this time, it is possible to obtain the time point that matches the azimuth angle of 6. It becomes possible to judge the performance of
上記の如＜ＰＬにおける再生信号を判別の対象とするこ
とが最も望ましいが、もちろんＰＬではなく両アジマス
角度が所定の僅少相差角度をもつ時点における再生信号
を判定対象とすることも可能である。Although it is most desirable to determine the reproduced signal at <PL as described above, it is of course also possible to determine the reproduced signal at a point in time when both azimuth angles have a predetermined slight phase difference angle instead of PL.
（発明の効果）
本願第１発明は以上のようにして実施できるものである
から、記録装置１にのみ首振機構を設けておけばよいこ
よいこととなり、従って各所で行なわれるべきテストサ
イドでは、記録済の試験用磁気テープを入手すれば、首
振機構のない安価な再生試験装置だけを用意して、これ
を用いれば事足り、既知の如く試験信号の記録に際して
は、再生の場合のようにテープを設けたりする必要なく
、またカセットオーディオの場合でも再生のときの如く
テープバットの必要がないから、従来法の実施に際して
生ずる前掲線欠陥を悉く解消することができ、再生試験
装置の装填箇所へ頻繁に被試験磁気ヘッドを出入させて
も、故障の生ずる虞れが殆どなくなり、テストを迅速か
つ容易に処理することが可能となる。(Effects of the Invention) Since the first invention of the present application can be implemented as described above, it is sufficient to provide a swing mechanism only in the recording device 1. Therefore, in the test side that should be carried out at various locations, If you obtain a recorded magnetic tape for testing, you only need to prepare an inexpensive playback test device without a swing mechanism and use it. Since there is no need to install a tape, and in the case of cassette audio, there is no need for a tape butt as in the case of playback, all of the above-mentioned line defects that occur when implementing the conventional method can be eliminated, and the loading point of the playback test equipment can be eliminated. Even if the magnetic head under test is moved in and out frequently, there is almost no risk of failure, and tests can be performed quickly and easily.
また本願第２発明に係る試験用磁気テープにより上記第
１発明を実施することで、当該試験方法を安価な費用に
て能率よく容易に実施でき、かつその判定につき高い信
頼性を期待できることとなる。Furthermore, by carrying out the first invention using the test magnetic tape according to the second invention of the present application, the test method can be carried out efficiently and easily at low cost, and high reliability can be expected in the judgment. .
第１図は本願第１発明の方法を実施するのに用い得る記
録装置と再生試験装置と、さらに第２発明に係る試験用
磁気テープをも表示した平面説明図、第２図は磁気テー
プの記録時と再生時におけるアジマス角度の相差角度ｄ
θと、再生信号の信号レベルとの関係を示す図表、第３
図の（ａ） （ｂ）は従来の被試験磁気ヘッド性能試験
方法を実施するのに用いられている記録装置と再生装置
とを示した各平面説明図である。
３・・・・・・試験用磁気テープ
４・・・・・・記録用磁気ヘッド
６・・・・・・被試験磁気ヘッド
Ｄｌ・・・・・・試験用磁気テープの走行方向代理人
弁理士 斎 藤 義 雄
１２ｍFIG. 1 is an explanatory plan view showing a recording device and a playback test device that can be used to carry out the method of the first invention of the present application, as well as a test magnetic tape according to the second invention, and FIG. 2 is a plan view of the magnetic tape. Phase difference angle d between azimuth angles during recording and playback
Chart showing the relationship between θ and the signal level of the reproduced signal, Part 3
Figures (a) and (b) are explanatory plan views showing a recording device and a reproducing device used to carry out the conventional performance testing method for a magnetic head under test. 3...Magnetic tape for test 4...Magnetic head for recording 6...Magnetic head under test Dl...Representative of the running direction of the magnetic tape for test
Patent attorney Yoshio Saito 12m
Claims (3)
される試験用磁気テープの走行方向とのなすアジマス角
度を、所望範囲で周期的に変化させることで、当該試験
用磁気テープに、上記試験信号を磁気的に記録した後、
この試験用磁気テープを再生ヘッドとしての被試験磁気
ヘッドに、一定のアジマス角度で走行させることにより
、当該試験信号を取り出し、所定信号レベルにおいる当
該再生信号によって、被試験用磁気ヘッドの性能が判定
されるようにしたことを特徴とする被試験磁気ヘッドの
性能試験方法。(1) By periodically changing the azimuth angle between the recording magnetic head and the running direction of the test magnetic tape on which the test signal is recorded, within a desired range, the above-mentioned After recording the test signal magnetically,
The test signal is extracted by running this test magnetic tape at a fixed azimuth angle against the magnetic head under test as a playback head, and the playback signal at a predetermined signal level determines the performance of the magnetic head under test. A method for testing the performance of a magnetic head under test, characterized in that the performance of a magnetic head under test is determined.
時のアジマス角度との合致時におけるものである特許請
求の範囲第１項記載の被試験磁気ヘッドの性能試験方法
。(2) A performance testing method for a magnetic head under test according to claim 1, wherein the predetermined signal level is a level when the azimuth angle during recording and the azimuth angle during reproduction match.
される試験用磁気テープの走行方向とのなすアジマス角
度を、上記記録用磁気ヘッドの回動により、所定範囲に
て周期的に変化させることで、上記試験用信号が磁気的
に記録されていることを特徴とする被試験磁気ヘッドの
性能試験に用いられる記録済の試験用磁気テープ。(3) The azimuth angle between the recording magnetic head and the running direction of the test magnetic tape on which test signals are recorded is periodically changed within a predetermined range by rotating the recording magnetic head. A recorded test magnetic tape used for a performance test of a magnetic head under test, characterized in that the test signal is magnetically recorded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31242986A JPS63168814A (en) | 1986-12-30 | 1986-12-30 | Performance test method for magnetic head to be tested and recorded test magnetic tape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31242986A JPS63168814A (en) | 1986-12-30 | 1986-12-30 | Performance test method for magnetic head to be tested and recorded test magnetic tape |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63168814A true JPS63168814A (en) | 1988-07-12 |
Family
ID=18029103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31242986A Pending JPS63168814A (en) | 1986-12-30 | 1986-12-30 | Performance test method for magnetic head to be tested and recorded test magnetic tape |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63168814A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100619689B1 (en) * | 2000-02-02 | 2006-09-08 | 엘지전자 주식회사 | Magnetic recording and reproducing apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52145202A (en) * | 1976-05-29 | 1977-12-03 | Yaskawa Denki Seisakusho Kk | Device for measuring oblique angle of magnetic head gap |
-
1986
- 1986-12-30 JP JP31242986A patent/JPS63168814A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52145202A (en) * | 1976-05-29 | 1977-12-03 | Yaskawa Denki Seisakusho Kk | Device for measuring oblique angle of magnetic head gap |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100619689B1 (en) * | 2000-02-02 | 2006-09-08 | 엘지전자 주식회사 | Magnetic recording and reproducing apparatus |
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