JPS634250B2 - - Google Patents
Info
- Publication number
- JPS634250B2 JPS634250B2 JP4290581A JP4290581A JPS634250B2 JP S634250 B2 JPS634250 B2 JP S634250B2 JP 4290581 A JP4290581 A JP 4290581A JP 4290581 A JP4290581 A JP 4290581A JP S634250 B2 JPS634250 B2 JP S634250B2
- Authority
- JP
- Japan
- Prior art keywords
- head
- bimorph
- recording
- envelope
- track
- 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
- 238000001514 detection method Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000758 substrate Substances 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
Description
【発明の詳細な説明】
本発明は、磁気記録再生装置において、再生時
に最適のトラツキングを得るための自動トラツキ
ング装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic tracking device for obtaining optimal tracking during reproduction in a magnetic recording and reproducing device.
従来、オートトラツキングを行なうためのずれ
検出法には、大別して、記録時パイロツト信号を
記録し再生時このパイロツト信号を検出してずれ
検出を行なう方式と、再生信号のエンベロープだ
けをみてずれを検出する方法がある。前者はずれ
検出の方法に自由度があり簡単な反面、従来の規
格化された記録フオーマツトに対してパイロツト
信号を入れることには無理がある。又、なるべく
映像信号以外の信号は妨害になるので入れたくな
いという考え方がある。一方後者は再生出力のエ
ンベロープだけを見るので従来の規格化された記
録フオーマツトのどれにでも使用できるという利
点があるが、ずれ検出の方法はおのずと限られて
くる。この後者の中で最有力と考えられているの
が所謂ウオブリング方式である。これは、圧電素
子からなるバイモルフ板に再生ヘツドを取りつけ
可動ヘツドとし、これをある一定の周波数で強制
振動させると、このヘツドの再生出力エンベロー
プはヘツドの振動に応じて変動することになる
が、この変動の位相はオントラツク時、オントラ
ツクより上方向にずれた時、オントラツクより下
にずれた時とで異なるため、元の強制振動の位相
と再生エンベロープの変動の位相を同期検波する
ことによりずれ方向及びずれ量がわかることにな
る。この方式は既に業務用のVTRでは実用化さ
れているが、これを民生用に適用する場合に問題
となるのは、再生エンペロープの平坦度である。
民生用VTRでは映像信号の輝度成分はFM記録
されているためエンベロープは理論的には平坦に
なるはずであるが実際にはかなりの変動成分があ
り、平坦度が悪い。業務用では記録トラツク幅が
100μｍ程度あるのに対して、民生用では高記録
密度化が進み19μｍ程度の狭トラツクが実現され
ている。このためエンベロープの平坦度はさらに
悪くなつている。このようにエンベロープ平坦度
が悪い条件のもとでヘツドを強制振動させても、
かなり振動振幅を大きくしないとエンベロープの
元々の変動と強制振動による振動が区別できな
い。この振幅は経験上少なくとも3μｍ程度以上
必要である。ところが、トラツク幅20μｍで±3μ
ｍ振幅で振動させると再生出力変動は15％にも及
び、低域変換された色信号に対してはフリツカー
が生じやすくなる上、輝度成分のＳ／Ｎの劣化も
目立つようになる等の不具合が生じてくる。 Conventional methods for detecting discrepancies for auto-tracking can be roughly divided into two methods: one is to record a pilot signal during recording and detect this pilot signal during playback to detect discrepancies, and the other is to detect discrepancies by looking only at the envelope of the reproduced signal. There is a way to detect it. The former method has a degree of freedom in detecting deviations and is simple, but on the other hand, it is difficult to input a pilot signal into the conventional standardized recording format. Also, there is a concept that it is desirable to avoid inputting signals other than video signals as they may cause interference. On the other hand, the latter has the advantage that it can be used with any of the conventional standardized recording formats because it only looks at the envelope of the playback output, but the method of detecting deviation is naturally limited. Among these latter methods, the so-called wobbling method is considered to be the most promising. This means that when a reproducing head is attached to a bimorph plate made of a piezoelectric element to make it a movable head, and this head is forced to vibrate at a certain frequency, the reproducing output envelope of this head will fluctuate in accordance with the vibration of the head. The phase of this fluctuation differs when on-track, when it deviates upward from on-track, and when it deviates below on-track, so by synchronously detecting the phase of the original forced vibration and the phase of the fluctuation of the reproduction envelope, we can detect the phase of the fluctuation in the direction of the deviation. and the amount of deviation. Although this method has already been put to practical use in commercial VTRs, the problem when applying it to consumer use is the flatness of the playback envelope.
In a consumer VTR, the luminance component of the video signal is recorded using FM, so the envelope should theoretically be flat, but in reality there is a considerable amount of fluctuation component and the flatness is poor. For business use, the recording track width is
While the track width is approximately 100 μm, as recording densities have increased in consumer use, narrow tracks of approximately 19 μm have been realized. As a result, the flatness of the envelope becomes even worse. Even if the head is forced to vibrate under conditions with poor envelope flatness,
Unless the vibration amplitude is considerably increased, it is not possible to distinguish between the original fluctuation of the envelope and the vibration caused by forced vibration. Based on experience, this amplitude is required to be at least about 3 μm or more. However, with a track width of 20 μm, the difference is ±3 μm.
When vibrating with an amplitude of m, the playback output fluctuation reaches as much as 15%, and problems such as flickering are more likely to occur for color signals that have been converted to low frequencies, and the deterioration of the S/N of the luminance component becomes noticeable. will arise.
本発明は上述した点にかんがみ、狭トラツク型
VTRのように再生信号のエンベロープ、平坦度
が余り良くない場合に、再生画像の質を劣化させ
ることなく良好なトラツキングを行なう自動トラ
ツキング装置を提供することを目的とする。 In view of the above points, the present invention provides a narrow track type
An object of the present invention is to provide an automatic tracking device that performs good tracking without deteriorating the quality of a reproduced image when the envelope and flatness of a reproduced signal are not very good as in a VTR.
以下、本発明の一実施例を図面を参照して説明
する。まずウオブリング方式の原理を第１図、第
２図、第３図、第４図を用いて簡単に説明する。
第１図に示すように再生時ヘツド１が記録トラツ
ク２を矢印の向きに走行する場合１′，１″に示す
ようにヘツドが記録トラツクからずれて走行する
場合がある。このずれを検知するのがウオブリン
グ方式である。そのためヘツドを記録トラツク方
向と直角方向に変位できるようにしておく。例え
ば、圧電素子を貼り合わせて作つたバイモルフ板
の一端にヘツドチツプを固定することにより電気
的にヘツドの変位を制御することができる。この
可動のヘツド１を再生時ある一定の周波数で強制
振動させてやると、記録トラツク幅とヘツド幅が
等しくしてあるので、ヘツドと記録トラツクの重
なり幅が時間的に変動することになる。そのた
め、ヘツド１の再生出力のエンベロープは例えば
第２図に示すようにヘツド１の振動に応じて変動
する。このヘツド１の振動の位相をヘツド１の再
生出力のエンベロープ変動の位相とが、ヘツドの
ずれ方向によつてある決まつた関係にあることを
示したのが第３図と第４図である。第３図ａ，
ｂ，ｃは各々ヘツド１の中心線４が記録トラツク
２の中心線３と一致している場合、即ちオントラ
ツクの状態、ヘツド１が進行方向に向かつて左側
にｘだけずれた状態、ヘツド１が進行方向に向か
つて右側にｘだけずれた状態の３態様を示してい
る。第３図ａのような走行状態の時、第４図ａに
示すような振動状態でヘツド１を振動させると、
ヘツド１はどちら側にはみだしてもエンベロープ
出力が減ることから第４図ｂに示すようなエンベ
ロープ検波出力が得られる。但し、零レベルはヘ
ツド１が記録トラツク２と完全に重なつた瞬間の
エンベロープ検波レベルを表わしている。第３図
ｂのようにヘツド１が進行方向に向かつて左にず
れている場合には、ヘツド１の振動によつて左に
ずれるとエンベロープ出力は減り、右にずれると
増えるため、エンベロープ検波出力は第４図ｃの
ようになる。一方ヘツドが右にずれた第３図ｃの
ような状態で振動させると、ヘツド１が左に変位
したときエンベロープ出力は増え、右に変位した
とき出力は減ることになるため第４図ｄに示すよ
うなエンベロープ検波出力が得られる。第４図
ａ，ｂ，ｃ，ｄを比較するとわかるようにヘツド
１の振動の位相とエンベロープ変動を検波した信
号の位相との関係は、ヘツド１が右にずれた場合
と、左にずれた場合とで逆になつている。即ち、
第４図ａ，ｂ，ｃ，ｄの各波形振幅に＋、−の符
号をつけ、ヘツドの振動の符号に、これに対応す
るエンベロープ変動検波出力の符号をかけ合わせ
たものとつくると、第４図ｅ，ｆ，ｇのようにな
る。つまり、オントラツク時には、第４図ｅのよ
うに＋、−の符号が交互に出てくるのに対して、
左側にずれた場合、第４図ｆのように一符号だけ
になり、右側にずれた場合には第４図ｇのように
＋符号だけとなる。これらの出力を各々平滑する
と点線で示すようにオントラツク時には０、左側
にずれた場合には−、右側にずれた場合には＋の
直流出力が得られ、これによりヘツド１とトラツ
ク２のずれを検出することができる。具体的には
ヘツド振動信号（第４図ａ）を用いてエンベロー
プ検波出力（第４図ｂ，ｃ，ｄを同期検波すれば
第４図ｅ，ｆ，ｇの出力が得られ、これをローパ
スフイルタに通して平滑すれば、ずれ検出信号が
得られる。この信号を前記バイモルフ板にフイー
ドバツクしてやり、ずれ検出出力が零になるまで
行なえば最適トラツキングが得られたことにな
る。 Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, the principle of the wobbling method will be briefly explained using FIGS. 1, 2, 3, and 4.
As shown in FIG. 1, when the head 1 travels along the recording track 2 in the direction of the arrow during reproduction, the head may run deviated from the recording track as shown at 1' and 1''.This deviation is detected. This is the wobbling method.For this reason, the head is made to be able to move in a direction perpendicular to the direction of the recording track.For example, by fixing the head chip to one end of a bimorph plate made by bonding piezoelectric elements, the head can be moved electrically. The displacement can be controlled.If this movable head 1 is forced to vibrate at a certain frequency during reproduction, since the recording track width and the head width are made equal, the overlapping width of the head and recording track will change over time. For this reason, the envelope of the reproduction output of head 1 varies according to the vibration of head 1, as shown in FIG. Figures 3 and 4 show that the phase of the envelope fluctuation has a certain fixed relationship depending on the direction of head displacement.
b and c are respectively shown when the center line 4 of the head 1 coincides with the center line 3 of the recording track 2, that is, on-track state, when the head 1 is oriented in the direction of travel and shifted by x to the left, and when the head 1 is Three modes are shown in which the vehicle is shifted by x to the right in the direction of travel. When the head 1 is vibrated in the vibration state shown in Fig. 4a while the head is in a running state as shown in Fig. 3a,
Since the envelope output of the head 1 decreases no matter which side it extends to, an envelope detection output as shown in FIG. 4b is obtained. However, the zero level represents the envelope detection level at the moment when head 1 completely overlaps recording track 2. When head 1 deviates to the left in the direction of travel as shown in Figure 3b, the envelope output decreases when it deviates to the left due to the vibration of head 1, and increases when it deviates to the right, so the envelope detection output is as shown in Figure 4c. On the other hand, if the head is vibrated in the state shown in Fig. 3 (c) with the head shifted to the right, the envelope output will increase when head 1 moves to the left, and the output will decrease when it moves to the right, so as shown in Fig. 4 (d). The envelope detection output as shown is obtained. As can be seen by comparing Figure 4 a, b, c, and d, the relationship between the phase of the vibration of head 1 and the phase of the signal detected by the envelope fluctuation is different when head 1 shifts to the right and when it shifts to the left. The situation is reversed. That is,
If we add + and - signs to each waveform amplitude in Figure 4 a, b, c, and d, and multiply the sign of the vibration of the head by the sign of the corresponding envelope fluctuation detection output, we get It will look like Figure 4 e, f, g. In other words, during on-tracking, + and - signs appear alternately as shown in Figure 4e, whereas
If it deviates to the left, there will be only one sign as shown in FIG. 4f, and if it deviates to the right, there will be only a + sign as shown in FIG. 4g. When each of these outputs is smoothed, as shown by the dotted line, a DC output of 0 is obtained when the track is on track, - when it is shifted to the left, and + when it is shifted to the right. can be detected. Specifically, if the head vibration signal (Fig. 4 a) is used to synchronously detect the envelope detection output (Fig. 4 b, c, d), the outputs shown in Fig. 4 e, f, g are obtained, which are then low-pass detected. By passing it through a filter and smoothing it, a deviation detection signal is obtained.If this signal is fed back to the bimorph plate and the process is continued until the deviation detection output becomes zero, optimal tracking will be obtained.
本発明による自動トラツキング装置のヘツド構
造の一例を第５図ａ，ｂを用いて説明する。 An example of the head structure of an automatic tracking device according to the present invention will be explained using FIGS. 5a and 5b.
同図ａはヘツド取り付け構造の上面図、同図ｂ
は同図ａを太い矢印の方向から見た側面図であ
る。映像信号用録再兼用ヘツド１は圧電素子より
なるバイモルフ板８に貼り付けられ、バイモルフ
板８は基板１２にねじ１０で固定されている。バ
イモルフ板８の先端部は電極１３，１４に電圧を
加えることにより、同図ｂの矢印１７の向きに変
位する。一方、バイモルフ板８は二重構造になつ
ており、その一部が削られ、別のバイモルフ板９
がバイモルフ板８の上の固定台１１に貼りつけら
れている。このバイモルフ板９の先端部にはヘツ
ド１と高さを揃えて補助ヘツド７が取り付けられ
ている。バイモルフ板９には電極１５，１６が取
り付けてあり、この電極に電圧を加えることによ
り、バイモルフ板９の先端部に取り付けられたヘ
ツド７は、ヘツド１と独立に矢印１７の方向に変
位することができる。 Figure a is a top view of the head mounting structure, Figure b
2 is a side view of the same figure a viewed from the direction of the thick arrow. The video signal recording/reproducing head 1 is attached to a bimorph plate 8 made of a piezoelectric element, and the bimorph plate 8 is fixed to a substrate 12 with screws 10. By applying a voltage to the electrodes 13 and 14, the tip of the bimorph plate 8 is displaced in the direction of the arrow 17 in FIG. On the other hand, the bimorph plate 8 has a double structure, and a part of it is shaved off to form another bimorph plate 9.
is attached to a fixed base 11 on top of the bimorph board 8. An auxiliary head 7 is attached to the tip of the bimorph plate 9 at the same height as the head 1. Electrodes 15 and 16 are attached to the bimorph plate 9, and by applying a voltage to these electrodes, the head 7 attached to the tip of the bimorph plate 9 is displaced in the direction of the arrow 17 independently of the head 1. Can be done.
以上の構造をもつバイモルフ板（以下、二重構
造バイモルフ板と呼ぶ）をエンドレステープを用
いた固定ヘツド型磁気記録再生装置に取り付けて
オートトラツキングを行なつた例について第６
図、第７図を用いて説明する。 Part 6 describes an example in which a bimorph plate with the above structure (hereinafter referred to as a double structure bimorph plate) is attached to a fixed head type magnetic recording/reproducing device using endless tape to perform auto-tracking.
This will be explained using FIG.
当装置では、記録トラツクは第６図に示す如く
磁気テープ５の長手方向に下から順番に形成され
てゆく。２は記録トラツクであり、６は記録トラ
ツク間のガードバンド（無記録部分）を示してお
り、記録トラツクの幅Twは録再ヘツド１および
補助ヘツド７のトラツク幅と等しくなつている。
この装置LVRではヘツドは固定され、磁気テー
プ５がピンチローラによつて駆動され走行する
が、その走行方向を太い矢印で示してある。 In this apparatus, recording tracks are sequentially formed in the longitudinal direction of the magnetic tape 5 from the bottom as shown in FIG. Reference numeral 2 indicates a recording track, and 6 indicates a guard band (unrecorded portion) between the recording tracks, and the width Tw of the recording track is equal to the track width of the recording/reproducing head 1 and the auxiliary head 7.
In this device LVR, the head is fixed and the magnetic tape 5 is driven and travels by a pinch roller, and the direction of travel is shown by a thick arrow.
また、この装置では、テープが１周するとヘツ
ドは、１トラツク分、テープの幅方向へ移動され
る。再生時ある一定の周波数0で発振する発振器
１８の出力は補助ヘツド７の取り付けられたバイ
モルフ板９の駆動回路１９に加えられ、補助ヘツ
ド７は周波数0で振動する。このため、補助ヘツ
ド７の再生出力をエンベロープ検波器２０でエン
ベロープ検波した出力は、前記周波数0に対応し
て変動する。この変動出力を前記ウオブリング方
式で説明したように、元の発振器１８の出力と、
同期検波器２１で検波すれば、その出力が補助ヘ
ツド７のオントラツクからのずれ、即ち、ヘツド
１とヘツド７の高さを揃えていることから、録再
ヘツド１のずれを示していることになるので、こ
の出力をローパスフイルタ２２を通した後バイモ
ルフ板８の駆動回路２３に加えれば、バイモルフ
板９はバイモルフ板８に取り付けられているた
め、ヘツド１，７は同じ量だけ動くことになり、
両ヘツド１，７は同時に最適トラツキング状態に
することができる。 Further, in this device, when the tape goes around once, the head is moved by one track in the width direction of the tape. During reproduction, the output of the oscillator 18 which oscillates at a certain frequency of 0 is applied to the drive circuit 19 of the bimorph plate 9 to which the auxiliary head 7 is attached, causing the auxiliary head 7 to vibrate at a frequency of 0 . Therefore, the output obtained by envelope detection of the reproduced output of the auxiliary head 7 by the envelope detector 20 fluctuates corresponding to the frequency 0 . As explained in the wobbling method, this fluctuating output is the original output of the oscillator 18,
If detected by the synchronous detector 21, the output will indicate a deviation from the on-track of the auxiliary head 7. In other words, since the heights of heads 1 and 7 are the same, it can be determined that the output indicates a deviation of the recording/reproducing head 1. Therefore, if this output is applied to the drive circuit 23 of the bimorph board 8 after passing through the low-pass filter 22, since the bimorph board 9 is attached to the bimorph board 8, the heads 1 and 7 will move by the same amount. ,
Both heads 1, 7 can be brought into optimum tracking condition at the same time.
二重構造バイモルフ板を使用すると、従来のウ
オブリング方式と異なり、録再ヘツドは振動させ
ないので、ウオブリングさせることによる色のフ
リツカー輝度信号のＳ／Ｎの低下等がなく狭トラ
ツク記録の際有利である。また、補助ヘツド７を
録再ヘツドと関係なく振動させられるので、かな
り大きな振幅で変動させられる。よつて狭トラツ
ク比によつてエンベロープ平坦度が悪くなつても
同期検波の精度がよくなり、引いてはトラツキン
グ精度が向上する。また、補助ヘツドを常時振動
させておけるので、「トラツキングがずれた時だ
けウオブリングさせてオントラツク状態に戻し、
その後は行なわない」ということではなく、再生
中常時、最適トラツキングを保つことができる。
これはLVRのように長手方向に記録する場合非
常に有利である。二重構造バイモルフ板は第５図
以外の構造でも可能である。また、これは、
LVRだけでなくヘリカルスキヤン型VTRにも原
理的には使用できる。 Unlike the conventional wobbling method, when a double-structured bimorph board is used, the recording/reproducing head is not vibrated, so there is no drop in S/N of the color flicker luminance signal due to wobbling, which is advantageous for narrow track recording. . Furthermore, since the auxiliary head 7 can be vibrated independently of the recording/reproducing head, it can be vibrated with a considerably large amplitude. Therefore, even if the envelope flatness deteriorates due to the narrow track ratio, the accuracy of synchronous detection is improved, and the tracking accuracy is improved. In addition, since the auxiliary head can be kept vibrating at all times, it is possible to wobble it only when the tracking goes out of alignment and return it to the on-track state.
Optimum tracking can be maintained at all times during playback, rather than saying that it will not be performed after that.
This is very advantageous when recording in the longitudinal direction like LVR. The double structure bimorph plate can also have a structure other than that shown in FIG. Also, this is
In principle, it can be used not only for LVRs but also for helical scan VTRs.
二重構造バイモルフ板は全体として閉ループの
自動制御になつているので、バイモルフ板８，９
の材質を同じくしておけば、バイモルフ板の経時
変化、温度変化に対してもトラツキング精度が落
ちることはない。 The double-structured bimorph board has closed-loop automatic control as a whole, so bimorph boards 8 and 9
If the same material is used, the tracking accuracy will not deteriorate even if the bimorph plate changes over time or changes in temperature.
録再ヘツド１が取り付けられたバイモルフ板８
と、補助ヘツド７が取り付けられたバイモルフ板
９とは、固定台１１を介して一体になされたが、
初めから一枚のバイモルフ板を用いて、先端辺か
ら切込み形のスリツトを設け、各々のバイモルフ
板の先端に録再ヘツドと補助ヘツドを取り付けて
もよい。さらに、このトラツキング装置は、その
本来の機能のみならず、補助ヘツドを消去ヘツド
として兼用することができる。つまり記録モード
においては、補助ヘツドがトラツク上を先行する
配置関係としておくことによつて、補助ヘツドに
消去信号を加えれば、さらに機能を拡大し得るも
のである。 Bimorph board 8 with recording/playback head 1 attached
and the bimorph plate 9 to which the auxiliary head 7 was attached were integrated via a fixing base 11.
Alternatively, a single bimorph board may be used from the beginning, a cut-shaped slit may be provided from the leading edge, and a recording/reproducing head and an auxiliary head may be attached to the leading end of each bimorph board. Furthermore, in addition to its original function, this tracking device can also use the auxiliary head as an erasing head. That is, in the recording mode, by arranging the auxiliary head in a leading position on the track, and applying an erase signal to the auxiliary head, the function can be further expanded.
以上述べたように本発明によれば、二重構造バ
イモルフ板を使用することにより、狭トラツク記
録VTRのように再生出力のエンベロープ平坦度
の悪い場合にも、ウオブリング方式の自動トラツ
キングが精度よく行なえ、かつ再生画像にはウオ
ブリングによる影響がないという利点を有した自
動トラツキング装置を提供できる。 As described above, according to the present invention, by using a double-structured bimorph board, automatic tracking using the wobbling method can be performed with high accuracy even when the flatness of the playback output envelope is poor, such as in a narrow track recording VTR. An automatic tracking device can be provided which has the advantage that the reproduced image is not affected by wobbling.
第１図はトラツク再生時のトラツクとヘツドの
ずれ状況を示した図、第２図はヘツド再生出力の
エンベロープの一例を示す図、第３図ａ〜ｃ、第
４図ａ〜ｇはウオブリング方式によるトラツキン
グずれ検出法を説明するのに示した信号波形図、
第５図ａ，ｂは本発明に係る二重バイモルフ板の
例を示す図、第６図は磁気テープパターンの説明
図、第７図は本発明による自動トラツキング装置
の一実施例を示すブロツク図である。
１……録再ヘツド、２……記録トラツク、５…
…磁気テープ、７……補助ヘツド、８，９……バ
イモルフ板、１１……固定台、１８……発振器、
１９，２３……駆動回路、２０……エンベロープ
検波器、２１……同期検波器、２２……ローパス
フイルタ。
Fig. 1 shows the deviation between the track and the head during track playback, Fig. 2 shows an example of the envelope of the head playback output, Figs. 3 a-c and 4 a-g show the wobbling method. The signal waveform diagram shown to explain the tracking deviation detection method by
5a and 5b are diagrams showing an example of a double bimorph plate according to the present invention, FIG. 6 is an explanatory diagram of a magnetic tape pattern, and FIG. 7 is a block diagram showing an embodiment of an automatic tracking device according to the present invention. It is. 1...recording/playback head, 2...recording track, 5...
... Magnetic tape, 7 ... Auxiliary head, 8, 9 ... Bimorph board, 11 ... Fixed stand, 18 ... Oscillator,
19, 23... Drive circuit, 20... Envelope detector, 21... Synchronous detector, 22... Low pass filter.
Claims (1)
イモルフ板と、前記録再ヘツドと高さを揃えるよ
うに補助ヘツドが先端に取り付けられ、本体は前
記第１のバイモルフ板に取り付けられた第２のバ
イモルフ板と、前記補助ヘツドを取り付けた第２
のバイモルフ板を変位させることにより該補助ヘ
ツドのトラツキングずれを検知し、その検知信号
を前記第２のバイモルフ板にフイードバツクする
ことによりトラツキングを得る手段とを具備した
ことを特徴とする自動トラツキング装置。 ２ 前記第１、第２のバイモルフ板は一体的に造
られ両者間は切込み状のスリツトによつて区分さ
れたことを特徴とする特許請求の範囲第１項記載
の自動トラツキング装置。[Scope of Claims] 1. A first bimorph plate with a recording head attached to the tip, an auxiliary head attached to the tip so as to be at the same height as the previous recording head, and a main body attached to the first bimorph plate. a second bimorph plate attached and a second bimorph plate attached with the auxiliary head;
An automatic tracking device comprising means for detecting a tracking deviation of the auxiliary head by displacing the second bimorph plate, and obtaining tracking by feeding back the detection signal to the second bimorph plate. 2. The automatic tracking device according to claim 1, wherein the first and second bimorph plates are integrally formed and are separated by a cut-like slit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4290581A JPS57158012A (en) | 1981-03-24 | 1981-03-24 | Automatic tracking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4290581A JPS57158012A (en) | 1981-03-24 | 1981-03-24 | Automatic tracking device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57158012A JPS57158012A (en) | 1982-09-29 |
| JPS634250B2 true JPS634250B2 (en) | 1988-01-28 |
Family
ID=12649042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4290581A Granted JPS57158012A (en) | 1981-03-24 | 1981-03-24 | Automatic tracking device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57158012A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59160825A (en) * | 1983-03-02 | 1984-09-11 | Mitsubishi Electric Corp | Bimorph type head for vtr |
| JPS59177025U (en) * | 1983-05-12 | 1984-11-27 | 三洋電機株式会社 | rotating head device |
| JPS6074214U (en) * | 1983-10-25 | 1985-05-24 | ソニー株式会社 | magnetic head device |
| JPH02260108A (en) * | 1989-03-30 | 1990-10-22 | Toshiba Corp | Magnetic head device |
-
1981
- 1981-03-24 JP JP4290581A patent/JPS57158012A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57158012A (en) | 1982-09-29 |
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