Degauss control for magnetic disk-drive preamplifier
US7813068B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 14, 2008 |
| Grant date | Oct 12, 2010 |
| Priority date | — |
| Expiry date | Apr 4, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0018
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
One embodiment of the invention includes a preamplifier system for a magnetic disk-drive. The system includes a current distributor configured to generate a reference current and to decay the reference current from a first magnitude to a second magnitude during a degauss period to degauss a magnetic disk write head. The degauss period defines a transition from a write cycle to a read cycle of the magnetic disk-drive and has a predetermined time duration that is independent of the first magnitude of the reference current during the write cycle. An output driver is configured to provide a write current to the magnetic disk write head having a magnitude with an absolute value that is based on the reference current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.