Circuit for detecting contact of MR head with disk surface
US5680265A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1996 |
| Grant date | Oct 21, 1997 |
| Priority date | — |
| Expiry date | Jan 16, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/09
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.