JPS63253505A - Magnetic recorder - Google Patents

Abstract

PURPOSE:To prevent occurrence of noise due to superimposed writing at an erasing starting part and of an unrecorded part at an erasing terminating part, by starting erasing from the track, from which recording is started at the time of commencement of recording, and terminating erasing at the track, at which recording is terminated when the recording is terminated. CONSTITUTION:Upon receiving a recording start command A, a 1st recording control circuit 8 outputs a 1st signal D-REC1 during the period of the vertical synchronizing signal V of video signals to be recorded. When the 1st signal D-REC1 is detected, a 2nd recording control circuit 9 outputs a 2nd signal D-REC2 to oscillation circuits 21, 22...24 simultaneously with the rise of switching signals outputted from a recording head switching circuit 3. When the 2nd signal D-REC2 is outputted, recording currents are supplied to recording heads 51, 52...54. When the circuit 8 receives a recording terminate signal B thereafter, the circuit 8 stops the signal D-REC1 during the period of the vertical synchronizing signal of vide signals being recorded. When the signal D-REC1 disappears, the circuit 9 stops the signal D-REC2 simultaneously with the rise of the switching signals SW1 and, further stops the oscillation of the oscillation circuits 21-24 so as to terminate the recording.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は４個のヘッドを順次切換えて記録する磁気記録
装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording device that records data by sequentially switching four heads.

従来の技術 この種の磁気記録装置としてはビデオテープレコーダが
ある。第４図は従来のごデオテープレコーダの要部の構
成を示し、第５図はその要部の波形図を示す。第４図に
おいて、記録制御回路１が記録開始の指令Ａを受けると
、一定時間だけ遅延させたタイミングｔ１で信号Ｄ−Ｒ
ＦＣが４つの発振回路２１．２２．２３．２４に出力さ
れる。2. Description of the Related Art Video tape recorders are examples of magnetic recording devices of this type. FIG. 4 shows the configuration of the main parts of a conventional video tape recorder, and FIG. 5 shows a waveform diagram of the main parts. In FIG. 4, when the recording control circuit 1 receives a command A to start recording, a signal D-R is sent at a timing t1 delayed by a certain period of time.
FC is output to four oscillation circuits 21, 22, 23, and 24.

信号Ｄ−ＲＦＣの印加された４つの発振回路２１〜２４
は、記録ヘッドスイッチング回路３から順に出力される
スイッチング信＠ｓｗｉ〜ＳＷ４の期間に順に発振し、
回転する上シリンダ４に取り付けられたＲ１記録ヘッド
５１、Ｌ１記録ヘッド５２、Ｒ２記録ヘッド５３、Ｌ２
記録ヘッド５４に記録電流を順に供給する。次に記録制
御回路１が記録終了の指令Ｂを受けると、タイミングｔ
２に信＠Ｄ−ＲＥＣが止められ、発振回路２１〜２４の
発振が止まり、記録が終了する。なお上シリンダ４に取
り付けられたフライングイレースヘッド〔以下、ＦＥヘ
ッドと称す〕６には、前記信号Ｄ−ＲＦＣの期間だけ発
振する発振回路７の信号が印加されており、ＦＥヘッド
７には消去電流がタイミングｔ１〜ｔ２にわたりて常時
供給されている。Four oscillation circuits 21 to 24 to which signal D-RFC is applied
oscillate in order during the period of switching signals @swi to SW4 sequentially output from the recording head switching circuit 3,
R1 recording head 51, L1 recording head 52, R2 recording head 53, L2 attached to the rotating upper cylinder 4
A recording current is sequentially supplied to the recording head 54. Next, when the recording control circuit 1 receives a command B to end recording, the timing t
2, the signal @D-REC is stopped, the oscillations of the oscillation circuits 21 to 24 are stopped, and recording is completed. Note that a signal from an oscillation circuit 7 that oscillates only during the period of the signal D-RFC is applied to a flying erase head (hereinafter referred to as FE head) 6 attached to the upper cylinder 4; Current is constantly supplied from timing t1 to timing t2.

発明が解決しようとする問題点 Ｒ１，Ｌｌ、Ｒ２，１２記録ヘツド５１〜５４とＦＥヘ
ッド６とは上シリンダ４に位置をずらせて取り付けられ
ているにもかかわらず、上記のような従来の構成では記
録と消去が同時に開始し、終了しているため、第６図に
示すようにＲ１゜Ｌｌ、Ｒ２，Ｌ２記録ヘッド５１〜５
４によるトラックＲ１，Ｌｌ、Ｒ２，Ｌ２に対して記録
開始時点では重ね書き部分ａが発生し、記録終了時点で
は未記録部分すが発生する。Problems to be Solved by the Invention Although the R1, Ll, R2, 12 recording heads 51 to 54 and the FE head 6 are attached to the upper cylinder 4 with their positions shifted, the above-mentioned conventional configuration Since recording and erasing start and end at the same time, as shown in FIG.
For the tracks R1, Ll, R2, and L2 of 4, an overwritten portion a occurs at the start of recording, and an unrecorded portion a occurs at the end of recording.

さらに、ＦＥヘッド６の幅が４／３トラックあるため、
記録σａ始のトラックより前のトラックの一部や、記録
終了のトラックより後のトラックの一部をも消去してし
まうという問題がある。Furthermore, since the width of the FE head 6 is 4/3 track,
There is a problem in that a part of the track before the track at the beginning of recording σa and a part of the track after the track at the end of recording are also erased.

本発明は記録開始部分での重ねＩきによるノイズの発生
や、記録終了部分での未記録部分の発生をなくすること
ができる記録再生装置を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a recording/reproducing apparatus that can eliminate the occurrence of noise due to overlapping I at the recording start portion and the occurrence of unrecorded portions at the recording end portion.

問題点を解決するための手段 本発明の記録再生装置は、消去ヘッドと第１〜第４の記
録ヘッドとを回転シリンダに取付けて、記録ヘッドスイ
ッチング回路から出力される第１〜第４のスイッチング
信号にしたがって１トラックごとに第１〜第４の記録ヘ
ッドを順次切換えて映像信号を記録し、第１〜第４の記
録ヘッドで記録された４トラックを前記消去ヘッドが３
回転で消去するよう構成するとともに、記録開始時には
前記映像信号の垂直同期信号中にステップ信号を発生し
て、記録終了時には前記垂直同期信号中に前記ステップ
信号をオフする第１の記録制御部と、前記ステップ信号
の検出後の第１のスイッチング信号のタイミングに第１
の記録ヘッドからの記録実行を指示し、前記ステップ信
号のオフの検出後の第１の記録ヘッドによる記録実行の
直前に記録終了を指示する第２の記録制御回路と、前記
ステップ信号の検出後の第４のスイッチング信号のタイ
ミングに消去ヘッドに消去の開始を指示し、ステップ信
号のオフの検出後の第４のスイッチング信号の直前に消
去ヘッドに消去の終了を指示する発振制御回路とを設け
たことを特徴とする。Means for Solving the Problems The recording and reproducing apparatus of the present invention has an erasing head and first to fourth recording heads mounted on a rotating cylinder, and the first to fourth switching output from a recording head switching circuit. The video signal is recorded by sequentially switching the first to fourth recording heads for each track according to the signal, and the erasing head erases the four tracks recorded by the first to fourth recording heads.
a first recording control unit configured to erase by rotation, generates a step signal during the vertical synchronization signal of the video signal at the start of recording, and turns off the step signal during the vertical synchronization signal at the end of recording; , a first switching signal at the timing of the first switching signal after the step signal is detected.
a second recording control circuit that instructs to execute recording from the first recording head and instructs to end recording immediately before the first recording head starts recording after detection of off of the step signal; and after detection of the step signal; and an oscillation control circuit that instructs the erasing head to start erasing at the timing of the fourth switching signal, and instructs the erasing head to end erasing immediately before the fourth switching signal after detection of off of the step signal. It is characterized by:

作用 この構成によると、第１〜第４の記録ヘッドをＲ１，Ｌ
’１．Ｒ２，Ｌ２記録ヘッドとした場合、記録は必ずＲ
１記録ヘッドから始められてＬ２記録ヘッドで終わり、
消去ヘッドはＲ１記録ヘッドが記録すべきトラックより
消去を始めてＬ２記録ヘッドが記録すべきトラックにて
消去を終えることとなり、これにより記録開始時には実
際の記録が始められるトラックから消去が始まり、終了
時には実際の記録が終えられるトラックで消去を終わら
せることができる。Operation According to this configuration, the first to fourth recording heads are connected to R1, L.
'1. When using R2, L2 recording heads, recording is always performed with R2 and L2 recording heads.
It starts with the 1 recording head and ends with the L2 recording head,
The erasing head starts erasing from the track where the R1 recording head should record and finishes erasing at the track where the L2 recording head should record, so that when recording starts, erasing starts from the track where actual recording starts, and when it ends, Erasing can be completed on the track where the actual recording ends.

実＃ｉ例 以下、本発明の一実施例を第１図〜第３図に基づいて説
明する。なお、従来例を示す第４図と同様の作用をなす
ものには同一符号を付けて説明する。ACTUAL EXAMPLE #i Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 3. Components having the same functions as those in FIG. 4 showing the conventional example will be described with the same reference numerals.

第１図は本発明の磁気記録装置を示し、第１の記録制御
回路８が記録開始の指令Ａを受けると、記録すべき映像
信号の垂直同期信号Ｖの期間中に第１の信号Ｄ−ＲＥＣ
１を出力する。この第１の信号Ｄ−ＲＥＣ１を検出した
第２の記録１ｌＩＩＪ１１１回路９は記録ヘッドスイッ
チング回路３から出力されるスイッチング信号ＳＷ１の
立上りと同時に第２の信号Ｄ−ＲＦＣ２を４つのｙｌ振
回路２ｔ　、　２２　。FIG. 1 shows a magnetic recording apparatus of the present invention, in which when a first recording control circuit 8 receives a command A to start recording, a first signal D- REC
Outputs 1. The second recording 1lIIJ111 circuit 9 that detected this first signal D-REC1 sends the second signal D-RFC2 to the four yl oscillator circuits 2t, at the same time as the switching signal SW1 outputted from the recording head switching circuit 3 rises. 22.

２３．２４に出力する。この第２の信号Ｄ−ＲＥＣ２の
印加された４つの発振回路２１〜２４は、記録ヘッドス
イッチング回路３から順に出力されるスイッチング信号
ＳＷ１〜ＳＷ４の期間に順に発振し、回転する上シリン
ダ４に取り付けられたＲ１記録ヘッド５１、［１記録ヘ
ツド５２、Ｒ２記録ヘッド５１、Ｌ２記録ヘッド５４に
記録電流を順に供給する。前記第１の信号Ｄ−ＲＥＣ１
は発振１！１ｌＪ１１］回路１０にも印加されており、
この第１の信号［）−ＲＥＣｌを検出した発振制御回路
１０は、第１の信号Ｄ−ＲＥＣ１の立上りを検出した債
のスイッチング信号ＳＷ４の立上りを検出したタイミン
グに第３の信号ＦＥ−ＯＮを発振回路７に出力し、発振
回路７は第３の信号ＦＥ−ＯＮが印加されると発振を始
めて、上シリンダ４に取り付けられたＦＥヘッド６に消
去電流が供給される。Output on 23.24. The four oscillation circuits 21 to 24 to which the second signal D-REC2 is applied sequentially oscillate during the period of the switching signals SW1 to SW4 sequentially output from the recording head switching circuit 3, and are attached to the rotating upper cylinder 4. A recording current is sequentially supplied to the R1 recording head 51, the [1 recording head 52, the R2 recording head 51, and the L2 recording head 54 that have been installed. Said first signal D-REC1
is also applied to the oscillation 1!1lJ11] circuit 10,
The oscillation control circuit 10 that has detected the first signal [)-REC1 outputs the third signal FE-ON at the timing when it detects the rising edge of the switching signal SW4 that has detected the rising edge of the first signal D-REC1. The oscillation circuit 7 starts oscillating when the third signal FE-ON is applied, and the erase current is supplied to the FE head 6 attached to the upper cylinder 4.

第１の記録制御回路８が記８１！了の指令Ｂを受は付け
ると、記録中の映像信号の垂直同期信号の期間中に第１
の信号Ｄ−ＲＥＣ１を止める。第１の信号０−ＲＥＣｌ
がなくなると、第２の記録制御回路９はスイッチング信
号ＳＷ１の立上りと同時に第２の信号Ｄ−ＲＥＣ２を止
め、これによって発振回路２１〜２４の発振が停止して
記録が終了する。第１の信号Ｄ−ＲＥＣ１が前述のよう
になくなると、発振制御回路７はスイッチング信号ＳＷ
４の立上りと同時に第３の信号ＦＥ−ＯＮを止め、これ
によって発振回路７の発振が停止して消去が終了する。The first recording control circuit 8 is 81! When the completion command B is accepted, the first
The signal D-REC1 is stopped. First signal 0-RECl
When the second recording control circuit 9 stops the second signal D-REC2 at the same time as the switching signal SW1 rises, the oscillation of the oscillation circuits 21 to 24 stops and the recording ends. When the first signal D-REC1 disappears as described above, the oscillation control circuit 7 outputs the switching signal SW
The third signal FE-ON is stopped at the same time as the signal 4 rises, whereby the oscillation of the oscillation circuit 7 is stopped and erasing is completed.

なお、第３図は記録トラックと消去トラックの関係を示
し、Ｒ１，Ｌｌ、Ｒ２，Ｌ２記録ヘッド５１〜５４によ
って記録された４つのトラックをＦＥヘッド６が３回転
で消去していることがわかる。ただし、これは従来例に
おいても同様である。Note that FIG. 3 shows the relationship between recording tracks and erased tracks, and it can be seen that the FE head 6 erases four tracks recorded by the R1, Ll, R2, and L2 recording heads 51 to 54 in three rotations. . However, this also applies to the conventional example.

このように、記録開始時にはＲ１記録ヘッド５１より記
録が始められ、記録終了時にはし２記録ヘツド５４で終
わり、消去はＲ１記録ヘッド５１で記録が始められるト
ラックからあらかじめ消去が始まり、Ｌ２記録ヘッド５
４で記録が終えられるトラックを消去した時点で消去を
終えるため、記録開始部分での重ね出きによるノイズの
発生や、記録終了部分での未記録部分の発生を防ぐこと
ができる。In this way, when recording starts, recording is started from the R1 recording head 51, and when recording ends, it ends at the second recording head 54, and erasing starts in advance from the track where recording is started by the R1 recording head 51, and from the L2 recording head 54.
Since the erasing ends when the track on which recording ends in step 4 is erased, it is possible to prevent the occurrence of noise due to overlapping in the recording start part and the occurrence of unrecorded parts in the recording end part.

発明の効果 以上のように本発明によれば、記録開始時には前記映像
信号の垂直同期信号中に、ステップ信号を発生して、記
録終了時には前記垂直同期信号中に前記ステップ信号を
オフする第１の記録ｖＪ御部と、前記ステップ信号の検
出後の第１のスイッチング信号のタイミングに第１の記
録ヘッドからの記録実行を指示し、前記ステップ信号の
オフの検出後の第１の記録ヘッドによる記録実行の直前
に記録終了を指示する第２の記録制御回路と、前記ステ
ップ信号の検出後の第４のスイッチング信号のタイミン
グに消去ヘッドに消去の開始を指示し、ステップ信号の
オフの検出後の第４のスイッチング信りの直前に消去ヘ
ッドに消去の終了を指示する発振１！ｉｌｌ　１１１１
回路とを設けたため、記録開始時には記録が始められる
トラックから消去を開始して、記録終了時には記録が終
えられるトラックで消去を終了し、記録開始部分での重
ね出きによるノイズの発生や、記録終了部分での未記録
部分の発生を防ぐことができるといった、すぐれた効果
を得ることができるものである。Effects of the Invention As described above, according to the present invention, a step signal is generated during the vertical synchronization signal of the video signal at the start of recording, and the step signal is turned off during the vertical synchronization signal at the end of recording. a recording VJ control unit, which instructs the first recording head to execute recording at the timing of the first switching signal after the detection of the step signal, and by the first recording head after the detection of the off-state of the step signal. a second recording control circuit that instructs to end recording immediately before recording execution; a second recording control circuit that instructs the erasing head to start erasing at the timing of a fourth switching signal after the detection of the step signal; and after detecting that the step signal is turned off; Just before the fourth switching signal, oscillation 1! instructs the erasing head to finish erasing. ill 1111
Since the circuit is equipped with a circuit, when recording starts, erasing starts from the track where recording starts, and when recording ends, erasing ends at the track where recording can be finished. It is possible to obtain excellent effects such as being able to prevent the occurrence of unrecorded portions at the end portions.

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

第１図は本発明の磁気記録装置の一実施例のブロック図
、第２図は同装置の要部波形図、第３図は記録トラック
と消去トラックの関係を示した模式図、第４図は従来の
磁気記録装置を示すブロック図、第５図は同装置の要部
波形図、第６図は同装置におけるトラックの関係を示し
た模式図である。 ２１〜２４．７・・・発振回路、３・・・記録ヘッドス
イッチング回路、５１・・・Ｒ１記録ヘッド〔第１の記
録ヘッド〕、５２・・・Ｌ１記録ヘッド〔第２の記録ヘ
ッド〕、５３°・・・Ｒ２記録ヘッド〔第３の記録ヘッ
ド）、５４・・・Ｌ２記録ヘッド〔第４の記録ヘッド〕
、６・・・フライングイレースヘッド〔消去ヘッド〕、
８・・・第１の記録制御回路、９・・・第２の記録制御
回路、１０・・・発振制御回路、ＳＷ１〜ＳＷ４・・・
スイッチング信号（第１〜第４のスイッチング信号）　
、Ｄ−ＲＥＣｌ・・・第１の信号〔ステップ信号〕。 代理人　　　森　　本　　義　　弘 第を図 ５ｎ−Ｒ１ｌｚ＊へ７ド（Ｈｔｔｈ　ｇど録ヘッド］ｈ
−ｔｔ　ｉ２ａヘッドＣ７１２ｔｈ　３２１１　ヘｙ　
ＦＪｓ３−ｙｚ　！ｃ’１ｉｚ−ド（Ｒ３のｇ？ｕ　へ
−ｔドＪ５４・・・Ｌ２；？録”Ｓ、−ｔド【第４のＶ
雲ゑへ・シト１６・・−フライシグイレスＡ−ソド（ｉ
１４五へ９ドｌ第２図 ４Ｅ振Ｏ銘（？） 第３図 第４図FIG. 1 is a block diagram of an embodiment of the magnetic recording device of the present invention, FIG. 2 is a waveform diagram of essential parts of the device, FIG. 3 is a schematic diagram showing the relationship between recording tracks and erasing tracks, and FIG. 4 5 is a block diagram showing a conventional magnetic recording device, FIG. 5 is a waveform diagram of essential parts of the same device, and FIG. 6 is a schematic diagram showing the relationship between tracks in the same device. 21 to 24.7... Oscillation circuit, 3... Recording head switching circuit, 51... R1 recording head [first recording head], 52... L1 recording head [second recording head], 53°...R2 recording head [third recording head], 54...L2 recording head [fourth recording head]
, 6...Flying erase head [erase head],
8... First recording control circuit, 9... Second recording control circuit, 10... Oscillation control circuit, SW1 to SW4...
Switching signal (first to fourth switching signals)
, D-RECl...first signal [step signal]. Agent Yoshihiro Morimoto to Figure 5n-R1lz*7 (Htth g record head) h
-tt i2a head C712th 3211 Hey
FJs3-yz! c'1iz-do (R3's g?u to -t de J54...L2;? record"S, -t de [4th V
Kumoehe Shito 16...-Fly Shiguires A-Sodo (i
145 to 9 dollars l Fig. 2 4E O inscription (?) Fig. 3 Fig. 4

Claims (1)

【特許請求の範囲】[Claims] １、消去ヘッドと第１〜第４の記録ヘッドとを回転シリ
ンダに取付けて、記録ヘッドスイッチング回路から出力
される第１〜第４のスイッチング信号にしたがって１ト
ラックごとに第１〜第４の記録ヘッドを順次切換えて映
像信号を記録し、第１〜第４の記録ヘッドで記録された
４トラックを前記消去ヘッドが３回転で消去するよう構
成するとともに、記録開始時には前記映像信号の垂直同
期信号中にステップ信号を発生して、記録終了時には前
記垂直同期信号中に前記ステップ信号をオフする第１の
記録制御部と、前記ステップ信号の検出後の第１のスイ
ッチング信号のタイミングに第１の記録ヘッドからの記
録実行を指示し、前記ステップ信号のオフの検出後の第
１の記録ヘッドによる記録実行の直前に記録終了を指示
する第２の記録制御回路と、前記ステップ信号の検出後
の第４のスイッチング信号のタイミングに消去ヘッドに
消去の開始を指示し、ステップ信号のオフの検出後の第
４のスイッチング信号の直前に消去ヘッドに消去の終了
を指示する発振制御回路とを設け、記録開始時には記録
が始められるトラックから消去を開始して、記録終了時
には記録が終えられるトラックで消去を終了するよう構
成した磁気記録装置。1. Attach the erasing head and the first to fourth recording heads to a rotating cylinder, and perform the first to fourth recording for each track according to the first to fourth switching signals output from the recording head switching circuit. The head is sequentially switched to record the video signal, and the erasing head is configured to erase the four tracks recorded by the first to fourth recording heads in three rotations, and when recording starts, the vertical synchronization signal of the video signal is a first recording control unit that generates a step signal during recording and turns off the step signal during the vertical synchronization signal when recording is completed; a second recording control circuit that instructs the recording head to execute recording, and instructs the first recording head to terminate recording immediately before the recording execution after detection of the off-state of the step signal; an oscillation control circuit that instructs the erasing head to start erasing at the timing of the fourth switching signal and instructs the erasing head to end erasing immediately before the fourth switching signal after detection of off of the step signal; A magnetic recording device configured to start erasing from a track where recording starts when recording starts, and end erasing from a track where recording ends when recording ends.