JPS603909U

JPS603909U - video tape recorder

Info

Publication number: JPS603909U
Application number: JP9440883U
Authority: JP
Inventors: 駒水　秀一
Original assignee: Sanyo Electric Co Ltd
Current assignee: Sanyo Electric Co Ltd
Priority date: 1983-06-20
Filing date: 1983-06-20
Publication date: 1985-01-12

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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図および第２図はそれぞれ従来のビデオテープレコ
ーダのヘッドディスクの平面図、回路ブロック図、第３
図ａ〜ｇは第２図の動作説明用タイミングチャート、第
４図以下の図面はこの考案のビデオテープレコーダの１
実施例を示し、第４図はヘッドディスクの平面図、第５
図は回路ブロック図、第６図は第５図の論理ゲート回路
の詳細な結線図、第７図ａ−には第５図の動作説明用タ
イミングチャートである。１５・・・ヘッドディスク、１６ａ、１７ａ・・・一方
の対のヘッド、１６ｂ、１７ｂ・二・他方の対のヘッド
、１８ａ、　　１８ｂ−・・一方の対の磁石、１９ａ、
１９ｂ・・・他方の対の磁石、２６・・・シフトレジス
タ、２７・・・論理ゲート回路、２９・・・リセットセ
ット型フリップフロップ。Figures 1 and 2 are a plan view, a circuit block diagram, and a third diagram of a head disk of a conventional video tape recorder, respectively.
Figures a to g are timing charts for explaining the operation of Figure 2, and Figure 4 and the following figures are one example of the video tape recorder of this invention.
An example is shown, FIG. 4 is a plan view of the head disk, and FIG.
6 is a detailed wiring diagram of the logic gate circuit of FIG. 5, and FIG. 7 a is a timing chart for explaining the operation of FIG. 5. 15...Head disk, 16a, 17a...One pair of heads, 16b, 17b.Second.Other pair of heads, 18a, 18b-...One pair of magnets, 19a.
19b...The other pair of magnets, 26...Shift register, 27...Logic gate circuit, 29...Reset set type flip-flop.

Claims

[Scope of utility model registration request]

In a video tape recorder, a head disk is provided with two pairs of heads, and one or the other head of the pair is switched by one or the other selected from one set of head switching signals. Pairs of magnets with different polarities are provided at two symmetrical positions, and the proximity of each of the magnets is detected to
A pulse having a negative component is generated, and two pulses having different phases are generated depending on a time-series signal of the pulse based on the rotation of the disk.
A pulse generating coil section for forming and outputting a composite signal of the sets of position detection signals is provided near the disk, two pairs of magnets and the coil section form a head position detecting means, and , a shift register operated by a data input formed by the positive or negative component of the composite signal and a clock input formed by the positive and negative components of the composite signal, and a plurality of output signals of the shift register and a paired selection signal. a logic gate circuit which inputs a signal, forms two sets of set command signals and reset command signals, and selectively outputs one or the other set command signal or reset command signal according to the pair selection signal; A video tape recorder comprising a reset set type fritab flop that is operated by one or the other set command signal or reset command signal selectively output from a gate circuit and outputs one or the other head switching signal.