JPS6211267U

JPS6211267U -

Info

Publication number: JPS6211267U
Application number: JP10255785U
Authority: JP
Priority date: 1985-07-05
Filing date: 1985-07-05
Publication date: 1987-01-23
Also published as: JPH0413792Y2

Description

[Brief explanation of the drawing]

図面はこの考案の実施例を示し、第１図はヘツ
ドキヤリツジの送り機構の平面図、第２図ａは要
部の平面図、第２図ｂは正面図、第２図ｃは第２
図ａのＡ―Ａ線に沿つてみた図、第３図はスクリ
ユーシヤフトのねじ部とピンとの係合状態を示す
概略説明図、第４図はトラツキングサーボのため
の制御回路の一実施態様を示す回路図、第５図は
第４図に基づくタイミングチヤート、第６図ａ，
ｂは他の実施例を示し、第６図ａは平面図、第６
図ｂは第６図ａのＢ―Ｂ線に沿つてみた図である
。１，２……支持板、３，４……ガイドシヤフト
、５……スクリユーシヤフト、５ａ……ねじ部、
６……ステツピングモータ、７，８……歯、９…
…ヘツドキヤリツジ、１０……磁気ヘツド、１１
……係合ピン、１２……ばね、２０……積層圧電
セラミツク、２１……ピンホルダー、２２……切
欠き、２３……ねじ、２４……ばね板、３０……
プリアンプ、３１……ＦＭ復調・同期信号分離回
路、３２……検波回路、３３……積分回路、３４
……ピークホールド回路、３５……比較回路、３
６……定電流源、３７……アナログスイツチ、３
８……スイツチ、３９……コンデンサ、ＳＣ……
スクリユー係合部。 The drawings show an embodiment of this invention; FIG. 1 is a plan view of the head carriage feeding mechanism, FIG. 2 a is a plan view of the main parts, FIG. 2 b is a front view, and FIG.
A view taken along line A-A in Figure a, Figure 3 is a schematic explanatory diagram showing the state of engagement between the threaded part of the screw shaft and the pin, and Figure 4 is an implementation of the control circuit for the tracking servo. FIG. 5 is a timing chart based on FIG. 4, FIG. 6 a,
6b shows another embodiment, FIG. 6a is a plan view, and FIG.
FIG. 6b is a view taken along line BB in FIG. 6a. 1, 2...Support plate, 3, 4...Guide shaft, 5...Screw shaft, 5a...Threaded part,
6... Stepping motor, 7, 8... Teeth, 9...
...Head carriage, 10...Magnetic head, 11
... Engagement pin, 12 ... Spring, 20 ... Laminated piezoelectric ceramic, 21 ... Pin holder, 22 ... Notch, 23 ... Screw, 24 ... Spring plate, 30 ...
Preamplifier, 31...FM demodulation/synchronization signal separation circuit, 32...Detection circuit, 33...Integrator circuit, 34
... Peak hold circuit, 35 ... Comparison circuit, 3
6... Constant current source, 37... Analog switch, 3
8...Switch, 39...Capacitor, SC...
Screw engagement part.

Claims

[Claims for Utility Model Registration] (1) A head carriage loaded with a magnetic head and transported along the radial direction of a magnetic disk, a guide shaft for guiding the head carriage, and a head carriage installed substantially parallel to the guide shaft. a screw shaft rotated by a motor; a screw engaging portion of the head carriage having an engaging pin provided on the head carriage and engaging with the screw shaft; and an engaging pin of the screw engaging portion. a spring that biases the head carriage in one direction so as to bring the screw shaft into contact with the wall surface of the threaded portion of the screw shaft; an electric actuator for moving the head carriage in a predetermined direction, the head carriage can be moved by a small amount in the direction of movement by the operation of the electric actuator, and the head carriage is coarsely fed by the motor at least during playback;
1. A head drive device for a magnetic disk, characterized in that minute feeding of the head carriage is performed by driving the electric actuator based on a servo signal. (2) The head drive device for a magnetic disk according to claim 1, wherein the electric actuator is displaceable in a direction substantially perpendicular to the axis of the screw shaft when the electric actuator is operated. (3) The head drive device for a magnetic disk according to claim 1, wherein the electric actuator is displaceable in the direction of movement of the head carriage when activated.