JPS6336957U

JPS6336957U -

Info

Publication number: JPS6336957U
Application number: JP12986186U
Authority: JP
Priority date: 1986-08-26
Filing date: 1986-08-26
Publication date: 1988-03-09

Description

[Brief explanation of the drawing]

第１図は本考案に係る磁気ヘツド位置制御回路
の一例をそれが適用されたデイスク装置の一部と
共に示すブロツク図、第２図は第１図に示される
例の動作説明に供される波形図である。図中、１は磁気デイスク、２は磁気ヘツド、５
はフオトエンコーダ、１０及び１８は比較部、１
２はモータ駆動部、１３は速度／位置信号形成部
、１９は制御特性切換部、２０は積分器、２５は
コントロール・ユニツトである。 FIG. 1 is a block diagram showing an example of the magnetic head position control circuit according to the present invention together with a part of a disk device to which the circuit is applied, and FIG. 2 is a waveform used to explain the operation of the example shown in FIG. It is a diagram. In the figure, 1 is a magnetic disk, 2 is a magnetic head, and 5 is a magnetic disk.
is a photo encoder, 10 and 18 are comparison parts, 1
2 is a motor drive section, 13 is a speed/position signal forming section, 19 is a control characteristic switching section, 20 is an integrator, and 25 is a control unit.

Claims

[Claims for Utility Model Registration] A magnetic head for writing and reading information to and from a magnetic disk on which a large number of annular recording tracks are formed is moved in a direction across the annular recording tracks while facing the magnetic disk. a magnetic head drive unit that detects the position of the magnetic head with respect to the magnetic disk, and a position detection unit that generates a detected position signal according to the detected position; a reference position signal generating means for transmitting a reference position signal corresponding to the target position; a comparison output signal is obtained by comparing the detected position signal and the reference position signal; a magnetic head drive control unit that controls the operation of the magnetic head drive unit in order to reach the target position; a variation detection unit that detects a variation in the comparison output signal; and a variation detected by the variation detection unit that detects the variation detected by the variation detection unit. When the comparison output signal is within a predetermined value within one period, the low frequency region gain in the control system including the magnetic head drive section, position detection section, reference position signal generation means, and magnetic head drive control section is determined. A magnetic head position control circuit comprising: gain control means for increasing the gain;