JPS6288104A - Rotary head type magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce and eliminate a beat fault caused by a double recording, by switching and using successively one of other rotary heads running before a rotary head which is recording a signal, as an erasing head, among the rotary heads which have been placed at an equal angle. CONSTITUTION:Rotary heads R, L, R' and L' are placed at an equal angle, and a magnetic tape 2 is wound spirally to a head cylinder 1 extending over >=280 deg., and run. The head L which is positioned in front of the head R scans a part belong ahead by about 1/3 of a track length from a scanning position of the head R, in a state that it has been shifted from a scanning locus 8 of the head R, and the head R' scans a part being ahead by about 2/3 of the track length. An erasing current is switched and impressed successively to the head which is positioned in front of the head which is recording a signal, earlier by a period corresponding to length of 1/3 of the track length than a period in which the heads R, L, R' and L8 record a signal successively. In this way, a beat fault caused by a double recording can be reduced and eliminated.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、複数個の回転磁気ヘッドを順次切換えて使用
し、磁気テープの長手方向に対して傾斜した記録軌跡と
して、例えばテレピジョノ信号を順次記録再生する回転
ヘッド型磁気記録再生装置４に関するもので、特に記録
時における消去手段に特徴を有する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention uses a plurality of rotating magnetic heads that are sequentially switched to sequentially record and reproduce, for example, a television signal as a recording locus that is inclined with respect to the longitudinal direction of a magnetic tape. The present invention relates to a rotary head type magnetic recording/reproducing device 4, and is particularly characterized by erasing means during recording.

従来の技術 従来より、回転ヘッド型磁気記録再生装置の一方式とし
て、特公昭５３−２５６６４号公報に示されているよう
に、等角度に配置されたｎ個（ｎ≧３の整数）の回転磁
気ヘッドの回転軌跡に対して、磁気テープを（１−”）
Ｘ３６０度以上にわたってらせん状に巻き付けて走行せ
しめ、上記各回転磁気へ、ドの（１−−１−）Ｘ３６０
度の回転区間毎に順次回転磁気ヘッドを切換えて使用し
、磁気テープの長手方向に対して傾斜した記録軌跡を得
る方式が考えられている。BACKGROUND ART Traditionally, as a type of rotary head type magnetic recording/reproducing device, as shown in Japanese Patent Publication No. 53-25664, n pieces (an integer of n≧3) of rotations arranged at equal angles have been used. The magnetic tape is (1-”) relative to the rotation trajectory of the magnetic head.
The (1--1-)X360 of the
A method has been considered in which a rotating magnetic head is sequentially switched and used for each degree of rotation interval to obtain a recording locus that is inclined with respect to the longitudinal direction of the magnetic tape.

すなわち、第４図に示すように、４個の回転ヘッドＲ・
　Ｌ・　Ｒ’、Ｌ’、　　をヘッドシリンダ１に等間隔
に取り付け、磁気テープ２を前記回転ヘッドの回転軌跡
に対して２７０度以上らせん状に巻き付けて走行せしめ
、第４図に示す状態からヘットンリンダ１が２７０度回
転する区間は（ロ）転へ。That is, as shown in FIG. 4, four rotating heads R.
L and R', L' are attached to the head cylinder 1 at equal intervals, and the magnetic tape 2 is wound in a spiral shape of 270 degrees or more with respect to the rotation locus of the rotary head. The section where 1 rotates 270 degrees is a (b) rotation.

ドＲを使用し、次の２７０度の回転区間は回転へノドＬ
′を、更に次の２７０度の回転区間は回転ヘッドＲ′　
を使用するというように順次へ２．ドを切換えて使用し
、第５図に示すような記録軌跡３゜４．５．６を得るも
のである。For the next 270 degree rotation section, use the rotor L.
', and the next 270 degree rotation section is the rotating head R'
2. Use . By switching between modes, a recording trajectory of 3°4.5.6 as shown in FIG. 5 can be obtained.

なお、前記回転へ、ドＲとＲ′、またり、ｌ！：Ｌ’は
そ肛ぞれ同一アジマス角度を有し、ＲとＬは互いに異な
るアジマス角度に設定されており、甘た、これらヘッド
のトラック幅は最終的な記録パターンのトラックピッチ
ｔより約１．３３倍であり、先に記録された記録トラッ
クの一部に重複して、その部分を新たな記録・軌跡とし
て記録している。In addition, to the above rotation, do R and R', again, l! : L' has the same azimuth angle, R and L are set to different azimuth angles, and the track width of these heads is approximately 1 smaller than the track pitch t of the final recording pattern. .33 times, and overlaps a part of the previously recorded recording track, and that part is recorded as a new record/trajectory.

発明が解決しようとする問題点 しかしながら、上記のような構成において、記録時には
固定の消去ヘッド３により消去しながら記録するもので
あるが、既に記録されているテープに連続して記録する
場合、いわゆる継ぎ撮り時には、消去ヘッド３とヘッド
シリンダ１間のテープ長は消去されないこととなり、そ
の部分は既に記録さ−ｒ’ｂ２先信号□（νＬ跡の上に
重ねて新たな信号を記録することとなり、再生信号にビ
ートか生じる問題があ−た。Problems to be Solved by the Invention However, in the above configuration, recording is performed while erasing using the fixed erasing head 3, but when recording continuously on a tape that has already been recorded, the so-called During splicing, the tape length between the erasing head 3 and head cylinder 1 will not be erased, and a new signal will be recorded over the already recorded −r'b2 destination signal □ (νL trace). However, there was a problem with beats occurring in the reproduced signal.

この対策としては、各回転ヘッドＲ，Ｌ、　　Ｒ’。As a countermeasure for this, each rotating head R, L, R'.

Ｌ′の前にそ几ぞれ消去へ、ドを配置するフチイングイ
レース方式が考えら几ているが、この場合、４個の消去
ヘッドをシリンダ１に設ける必要があり、コストアップ
につながるものである。A bordering erase method is being considered in which each erase head is placed in front of L', but in this case, four erase heads must be installed in cylinder 1, which would lead to an increase in cost. It is.

本発明は、上記問題点にかんがみ、特に新たな消去へ、
ドを設けることなく、上述のフチイングイレース方式と
同様な効果を得んとするものである。In view of the above-mentioned problems, the present invention particularly aims at new erasure,
This method aims to obtain the same effect as the above-mentioned edge-in erase method without providing a pad.

問題点全解決するための手段 本発明の回転ヘッド型磁気記録再生装置は、記録再生に
使用される複数の回転ヘッドの内、信号を記録している
回転ヘッドに先だってテープ？走行する他の回転ヘッド
の１つを消去へ・ノドとして＋＋ｍ次切換え使用せんと
するものである。Means for Solving All Problems The rotary head type magnetic recording/reproducing apparatus of the present invention has a rotary head which is used for recording and reproducing, and which is connected to the tape prior to the rotary head recording the signal. One of the other rotating rotating heads is used for erasing and as a nod for ++m-order switching.

作用 上記構成によｊ、ば、新たに消去ヘッドを設けることな
く、回転ヘッドによって記録する走査直前に順次消去−
ウニ行なわれるため、インサート記録においてもビート
障害は群成除去されることとなる。Operation With the above configuration, for example, sequential erasing can be performed immediately before scanning by a rotary head without providing a new erasing head.
Since this is done in a uniform manner, beat disturbances can be removed in groups even in insert recording.

実施例 以下、本発明の一実施例を第４図に示す４個のヘッドを
使用した回転ヘッド型磁気記録再生装置に適用した場合
を例にあげ説明する。Embodiment Hereinafter, an embodiment of the present invention will be described, taking as an example a case in which it is applied to a rotary head type magnetic recording/reproducing apparatus using four heads shown in FIG.

今、４個のヘッドＲ，Ｌ、　　Ｒ’　、　　Ｌ’の各へ
。Now to each of the four heads R, L, R', L'.

ド幅が、記録トラックピッチｔと等しい場合を考えると
、第１のヘッドＲが走査を開始した時には第１図に示す
ように第１のヘッドＲの前に位置する第２のヘッドＬは
ヘッドＨの走査位置よりトランク長の略Ｗ（テープ巻付
は角で９６に相当）だけ先をヘッドＨの走査すべき軌跡
８に対してトラックの殆だけずれた状態で走査している
。また、第３の一＼ノドＲ′はトラ、り長の略％だけ先
をヘッドＨの走査すべき軌跡８に対してトラック幅の％
だけずれた位置にある。Considering the case where the recording track width is equal to the recording track pitch t, when the first head R starts scanning, the second head L positioned in front of the first head R is The head H is scanned from the scanning position of the head H by approximately the trunk length W (the tape winding corresponds to 96 corners) in a state where the head H is shifted by most of the track with respect to the locus 8 to be scanned. In addition, the third throat R' is approximately % of the track width with respect to the trajectory 8 to be scanned by the head H.
It is located at a different position.

すなわち、信号を記録しているヘッドの前に位置するヘ
ッドは、常に信号を記録しているヘッドよりトラック長
の略殆に相当するＩｔＪ１間だけ先行し〜、かつ、信号
を記録しているヘッドの走査すべき・１兆跡を、その軌
跡の係だけずｎた状態で走査する。In other words, the head that is located in front of the head that is recording the signal is always ahead of the head that is recording the signal by ItJ1, which corresponds to almost the entire track length, and the head that is recording the signal is The 1 trillion traces to be scanned are scanned not only in relation to the trajectory but also in different states.

従って、第２図に示すように、各磁気へ、ドＲ９Ｌ、Ｒ
’、Ｌ’が順次信号を記録する期間’ｊＨ＋ｔＬ　＋　
　ｔ＋＋′、　　ｔ、ｒより、トラック長の発の長さに
相当する期間だけ早く、そ汎ぞれ信号を記録するヘッド
の前に位置するヘッドに順次消去電流を切換えて印加す
れば、記録に先立って、記録すべき軌跡を順次消去する
ことが出来るものである。Therefore, as shown in FIG.
', L' sequentially records signals 'jH+tL +
If the erasing current is sequentially applied to the head located in front of the head that records the signal earlier than t++', t, and r by a period corresponding to the length of the track length, recording can be started. In advance, the tracks to be recorded can be sequentially erased.

この結果、継ぎ撮り後の記録軌跡は第３図に示すように
各記録軌跡間にトラックピッチの発だけの幅の無記録帯
を有するパターンとなるが、テープの互換性には問題の
ないものである。As a result, as shown in Figure 3, the recording trajectory after splicing becomes a pattern with a blank band as wide as the track pitch between each recording trajectory, but there is no problem with tape compatibility. It is.

上記実施例では、ヘッドＲ，Ｌ、　　Ｒ’　、　　Ｌ’
のヘッド幅をぞ′！１．ぞれ記録ピッチｔと等しくした
場合を示したので、Ｖ３ｔだけ消え残りが生じる。この
為、実際にはヘッドトラック幅を略１．３３倍にし消え
残りが牛しないようにしている。In the above embodiment, the heads R, L, R', L'
Check out the head width! 1. Since the case where each of the recording pitches is made equal to the recording pitch t is shown, only V3t remains unerased. For this reason, the head track width is actually increased by about 1.33 times to prevent the remaining parts from disappearing.

発明の効果 以上のように本発明によｎば、新たに消去用の回転へノ
ドを設けることなく、記録に先だって記録すべき軌跡を
順次消去することが出来るため、簡単な構成により、二
重記録によるビート障害の軽減除去された継ぎ撮りが可
能となるものである。Effects of the Invention As described above, according to the present invention, the trajectory to be recorded can be sequentially erased prior to recording without providing a new rotation slot for erasing. It is possible to perform continuous shooting in which beat disturbances caused by recording are reduced and eliminated.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の回転ヘッド型磁気記録再生装置の一実
施例の回転ヘッドの走査軌跡を示す図、第２図は同実施
例のヘッドスイッチの夕°イミングを示す図、第３図は
同実施例での重ね書き後の記録パターンを示す図、第４
図は本発明が適用され得るシリンダのヘッド配置図、第
５図はその記録パターンを示す図である。 １・・・・・・ヘッドシリンダ、２・・・・・磁気テー
プ、３゜４、　５．　６・・・・・・記録軌跡。 代理人の氏名　弁理士　中　尾　敏　男　ほか１名＠　
１　図 ２−−−デー１゜FIG. 1 is a diagram showing the scanning locus of the rotary head of an embodiment of the rotary head type magnetic recording/reproducing apparatus of the present invention, FIG. 2 is a diagram showing the evening timing of the head switch of the same embodiment, and FIG. A fourth diagram showing the recording pattern after overwriting in the same embodiment.
The figure is a head arrangement diagram of a cylinder to which the present invention can be applied, and FIG. 5 is a diagram showing its recording pattern. 1...Head cylinder, 2...Magnetic tape, 3°4, 5. 6...Record trajectory. Name of agent: Patent attorney Toshio Nakao and 1 other person @
1 Figure 2 --- Day 1゜

Claims (1)

【特許請求の範囲】[Claims] 同一回転中心に対して等角度に配置されたｎ個（ｎ≧３
の整数）の回転磁気ヘッドの回転軌跡に対して磁気テー
プを［１−（１／ｎ）］×３６０度以上にわたってらせ
ん状に巻き付けて走行せしめ、前記各回転磁気ヘッドの
［１−（１／ｎ）］×３６０度の回転区間毎に順次前記
回転磁気ヘッドを切り換えて使用し、磁気テープの長手
方向に対して傾斜した記録軌跡として信号を記録すると
ともに、その記録動作中の回転磁気ヘッド以外の他の回
転磁気ヘッドの１つに消去電流を印加して消去ヘッドと
して動作せしめることを特徴とする回転ヘッド型磁気記
録再生装置。n pieces arranged at equal angles to the same rotation center (n≧3
A magnetic tape is spirally wound and run over [1-(1/n)] x 360 degrees or more with respect to the rotation locus of a rotating magnetic head with an integer of [1-(1/n)] of each rotating magnetic head. n)] The rotating magnetic head is sequentially switched and used for each rotation section of 360 degrees, and the signal is recorded as a recording locus inclined with respect to the longitudinal direction of the magnetic tape, and the rotating magnetic head other than the rotating magnetic head during the recording operation is used. A rotary head type magnetic recording/reproducing device characterized in that an erasing current is applied to one of the other rotating magnetic heads to cause it to operate as an erasing head.