JPS62120486U

JPS62120486U -

Info

Publication number: JPS62120486U
Application number: JP691286U
Authority: JP
Priority date: 1986-01-20
Filing date: 1986-01-20
Publication date: 1987-07-30

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例に係る回転磁気ヘツ
ドの配置を示す図、第２図はビデオテープの記録
パターンおよび回転磁気ヘツドのトレース状態を
模式的に示す図、第３図はスチル再生時の回転磁
気ヘツドのトレース状態を模式的に示す図、第４
図は第１図の実施例の要部のブロツク図、第５図
は正常記録時の回転磁気ヘツドのトレース状態を
模式的に示す図、第６図は正常記録時のタイムチ
ヤート、第７図は第１回転磁気ヘツドＲによる記
録が正常に行なわれていないときの第５図に対応
する図、第８図は第１回転磁気ヘツドＲによる記
録が正常に行なわれていないときの第６図に対応
するタイムチヤート、第９図は第２回転磁気ヘツ
ドＬによる記録が正常に行なわれていないときの
第５図に対応する図、第１０図は第２回転磁気ヘ
ツドＬによる記録が正常に行なわれていないとき
の第６図に対応するタイムチヤートである。Ｒ，Ｌ，Ｒ′……第１〜第３回転磁気ヘツド、
２……ビデオテープ、６……検出手段、９……第
１ＡＮＤ回路、１０……比較器、１２……第２Ａ
ＮＤ回路。 FIG. 1 is a diagram showing the arrangement of a rotating magnetic head according to an embodiment of the present invention, FIG. 2 is a diagram schematically showing the recording pattern of a video tape and the tracing state of the rotating magnetic head, and FIG. 3 is a still reproduction diagram. FIG. 4 schematically shows the trace state of the rotating magnetic head when
The figure is a block diagram of the main part of the embodiment shown in Figure 1, Figure 5 is a diagram schematically showing the trace state of the rotating magnetic head during normal recording, Figure 6 is a time chart during normal recording, and Figure 7 is a diagram showing the trace state of the rotating magnetic head during normal recording. is a diagram corresponding to FIG. 5 when recording by the first rotating magnetic head R is not performed normally, and FIG. 8 is a diagram corresponding to FIG. 6 when recording by the first rotating magnetic head R is not being performed normally. 9 is a diagram corresponding to FIG. 5 when recording by the second rotating magnetic head L is not performed normally, and FIG. 10 is a diagram corresponding to FIG. 5 when recording by the second rotating magnetic head L is not performed normally. This is a time chart corresponding to FIG. 6 when the test is not performed. R, L, R'...first to third rotating magnetic heads,
2... Videotape, 6... Detection means, 9... First AND circuit, 10... Comparator, 12... Second A
ND circuit.

Claims

[Scope of claims for utility model registration] (1) A pair of first and second azimuths that differ from each other
A magnetic head comprising a rotating magnetic head, and a third rotating magnetic head having the same azimuth as the first rotating magnetic head and having a wider head width than both of the rotating magnetic heads, and disposed adjacent to the second rotating magnetic head. In the recording/reproducing apparatus, when the first and second rotating magnetic heads record on the magnetic tape, the first and second rotating magnetic heads record on the magnetic tape based on the playback output from the third rotating magnetic head. What is claimed is: 1. A magnetic recording and reproducing apparatus characterized in that a detecting means is provided for detecting the presence or absence of and outputting a corresponding detection signal. (2) The detection means includes a first AND circuit to which the reproduction output from the third rotating magnetic head and a head switching pulse are applied, and a comparator for comparing the level of the reproduction output from the third rotating magnetic head with a reference level; The magnetic recording and reproducing apparatus according to claim 1, which includes an inverter that inverts the output of the comparator, and a second AND circuit to which the outputs of the first AND circuit and the inverter are applied.