JPS63193202U

JPS63193202U -

Info

Publication number: JPS63193202U
Application number: JP8378787U
Authority: JP
Priority date: 1987-05-29
Filing date: 1987-05-29
Publication date: 1988-12-13

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例である８ミリＶＴＲ
のための消去信号及び記録信号発生回路の回路図
、第２図は第１図の回路の動作を示すタイミング
チヤート、第３図は従来例及び実施例の８ミリＶ
ＴＲの回転ドラム付近の平面図、第４図Ａ及びＢ
はそれぞれ記録開始時及び記録終了時における固
定消去ヘツドを用いたＶＴＲのビデオテープの記
録トラツクの消去状態及び記録状態を示す平面図
、第５図Ａ及びＢはそれぞれ記録開始時及び記録
終了時における回転消去ヘツドを用いたＶＴＲの
ビデオテープの記録トラツクの消去及び記録状態
を示す平面図である。ＦＦ１，ＦＦ２…フリツプフロツプ、ＩＮＶ…
インバータ。 Figure 1 shows an 8mm VTR that is an embodiment of the present invention.
2 is a timing chart showing the operation of the circuit in FIG. 1, and FIG. 3 is a circuit diagram of the erase signal and recording signal generation circuit for
Plan view of the vicinity of the rotating drum of the TR, Figure 4 A and B
5A and 5B are plan views showing the erasing state and recording state of a recording track of a VTR videotape using a fixed erasing head at the start and end of recording, respectively. FIG. 2 is a plan view showing the erasing and recording state of a recording track of a video tape of a VTR using a rotary erasing head. FF1, FF2...Flip-flop, INV...
inverter.

Claims

[Scope of Claim for Utility Model Registration] A magnetic tape is wound around a rotating drum at a predetermined angle of 180° or more and 270° or less and runs,
a rotary erasing head, wherein the rotating drum is provided at a position approximately midway between the magnetic heads with respect to the center of rotation, and is driven by an erasing signal to erase signals recorded on two adjacent recording tracks on the magnetic tape; It has two magnetic heads which are provided at substantially symmetrical positions with respect to the center of rotation and are driven by a recording signal to record one field of signals on one recording track. In the tape recorder of the helical scanning system, the tape recorder records a second signal in synchronization with a head switching signal that is synchronized with a synchronization signal of the first signal that is successively reproduced on the magnetic tape on which the signal of After the recording instruction signal is input, a first one generates the erasing signal synchronized with the head switching signal.
and a second flip-flop that generates the recording signal delayed by a half cycle of the head switching signal from the output of the erasure signal generated by the first flip-flop. An erase signal and recording signal generation circuit device for a helical scanning tape recorder.