Circuit for detecting contact of MR head with disk surface

Details Circuit for detecting contact of MR head with disk surface Circuit for detecting contact of MR head with disk surface

1996-01-16

1997-10-21

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 67, 360113, 327 37, 327173, G11B 509, G11B 502

Patent

active

056802650

ABSTRACT:
A circuit for detecting contact of a magneto-resistive (MR) head with a disk surface by properly sensing disturbance signals without being effected by noises using a simple configuration. The circuit for detecting contact of the MR head with the disk surface by sensing a disturbance waveform generated by MR head contact with the disk surface comprises a comparator for comparing a signal read out by MR head with a threshold level V.sub.th ; a pulse width limiting circuit for restricting a pulse width x, which is wider than the predetermined pulse width x.sub.1, to a pulse width x.sub.1 ; and a D flip-flop circuit in which an output signal of the comparator being applied to both D terminal and R terminal, and an output signal from the pulse width limiting circuit being applied to T terminal, and an output signal being obtained from an inverted output terminal QC.

REFERENCES:
patent: 3906379 (1975-09-01), Tuhro
patent: 4165491 (1979-08-01), Geoffon
patent: 4371900 (1983-02-01), Huber
patent: 4760472 (1988-07-01), Minuhin et al.
patent: 5027340 (1991-06-01), Yumura et al.
patent: 5424668 (1995-06-01), Kohsaka
patent: 5440433 (1995-08-01), Yun

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