JPS5917012U

JPS5917012U - Video signal recording and playback device

Info

Publication number: JPS5917012U
Application number: JP10950982U
Authority: JP
Inventors: 貫井　勝義
Original assignee: 株式会社ケンウッド
Priority date: 1982-07-21
Filing date: 1982-07-21
Publication date: 1984-02-01

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図ａおよびｂは従来のＶＴＲにおける回転ヘッドド
ラムの説明図および磁気ヘッドの接続を示す接続図。第
２図ａおよびｂは本考案の一実施例におけるＶＴＲの回
転ヘッドドラムと磁気ヘッドと磁気テープとの関係を示
す平面図および磁気ヘッドの切替を示す概念図。第３図
は本考案の一実施例における磁気ヘッドを切替える切替
スイッチ回路および制御回路の一例を示す回路図。第４
図■および■は第３図に示す切替スイッチ回路お　・よ
び制御回路の作用の説明に供するタイムチャート。第５
図は本考案の一実施例における磁気ヘッドの切替周期を
示す説明図。第６図は本考案の一実施例による磁気テー
プ上の記録フォーマットを示す説明図。４・・・磁気テープ、９・・・回転ヘッドドラム、１０
゜１１．１２および１３・・・磁気ヘッド、１４．１４
−１．１４−２．１４−３．１４−１および４５・・・
切替スイッチ回路。１６・・・回転円板体、１７〜２１
・・・穴、２２・・・光源、２３および２４・・・ホト
トランジスタ、２５および３２・・・波形整形回路、２
６および２８・・・単安定マルチバイブレータ、２９お
よび３４・・・３進カウンタ、３０・・・４順カウンタ
、３１・・・デコーダ、４６，４７．４８および４９・
・・パルス幅選択回路。FIGS. 1a and 1b are diagrams illustrating a rotary head drum and a connection diagram showing the connection of a magnetic head in a conventional VTR. FIGS. 2a and 2b are a plan view showing the relationship between the rotary head drum, magnetic head, and magnetic tape of a VTR in an embodiment of the present invention, and a conceptual diagram showing switching of the magnetic head. FIG. 3 is a circuit diagram showing an example of a changeover switch circuit and a control circuit for switching magnetic heads in an embodiment of the present invention. Fourth
Figures ■ and ■ are time charts for explaining the operation of the changeover switch circuit and control circuit shown in FIG. 3. Fifth
The figure is an explanatory diagram showing the switching period of the magnetic head in one embodiment of the present invention. FIG. 6 is an explanatory diagram showing a recording format on a magnetic tape according to an embodiment of the present invention. 4... Magnetic tape, 9... Rotating head drum, 10
゜11.12 and 13...magnetic head, 14.14
-1.14-2.14-3.14-1 and 45...
Changeover switch circuit. 16...Rotating disk body, 17-21
... hole, 22 ... light source, 23 and 24 ... phototransistor, 25 and 32 ... waveform shaping circuit, 2
6 and 28... monostable multivibrator, 29 and 34... ternary counter, 30... 4 sequential counter, 31... decoder, 46, 47.48 and 49...
...Pulse width selection circuit.

Claims

[Scope of utility model registration request]

In a video signal recording and reproducing device having a magnetic head and using a helical scanning inclined azimuth recording method, a magnetic tape is wound around the rotary head drum at least 38 times, and the magnetic tape is provided at 90 degree intervals on the rotary head drum. 4 magnetic heads, a detection means for detecting the relative position and absolute position of the magnetic head during rotation of the head drum, and the output of the detection means is supplied to detect the length of the 38 rotation period of the rotary head drum. switching signal generating means for sequentially outputting output pulses of a certain width; delay means for delaying the output pulse from the switching signal generating means by a predetermined period during reproduction; a pulse width selection circuit which expands and outputs the output pulse width from the switching signal generating means at the time of reproduction, and outputs an output pulse having the same width as the output pulse from the switching signal generating means delayed by the delaying means at the time of reproduction; 1. A video signal recording and reproducing apparatus, comprising: a magnetic head that sequentially switches magnetic heads in accordance with output pulses from the switching signal generating means.