Apparatus for positioning head of magnetic storage device

Details Apparatus for positioning head of magnetic storage device Apparatus for positioning head of magnetic storage device

1997-09-30

2000-09-12

Loomis, Paul

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7705, 360 7708, 360 7704, G11B 5596

Patent

active

061186155

ABSTRACT:
An enhancement of the precision of the positioning of the head in a magnetic recording device having a magnetoresistive head is provided. The burst pattern stored in a storage medium is read by the head, and the two triangular waves are demodulated in the demodulation portion through the read/write portion. The actual head position signal generated in the head position signal generation portion is compared in the comparison portion with the target position generated in the target position generation portion. The deviation .DELTA.P as the output is controlled and calculated in the proportional and integral control portion, and the resultant output is compensated with regard to the reading gain difference of the head in the gain difference compensation portion. An arc-sine function transformation is carried out in the linearity compensation portion to compensate for the linearity. The position of the head is adjusted by the voice coil motor based on the signal after the compensation. The gain difference compensation characteristic can be changed during the operation of the magnetic recording device by the gain difference compensation characteristic determination portion.

REFERENCES:
patent: 5576909 (1996-11-01), Dierkes et al.
patent: 5684650 (1997-11-01), Kadlec et al.
patent: 5847894 (1998-12-01), Blank et al.

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