Bulk degausser with fixed arrays of magnetic poles configured for thick and small form factor, high coercivity media
US6714398B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 2002 |
| Grant date | Mar 30, 2004 |
| Priority date | — |
| Expiry date | Jun 7, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/0245
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A bulk degaussing apparatus and method for erasing magnetic media of various sizes. A media passage track is provided such that media passing therethrough is uniformly exposed to the magnetic fields provided through the gap. The bulk degaussing apparatus has fixed magnetic pole pairs predisposed for generating uniform magnetic field elements across a gap projecting magnetic flux across the gap for erasing various sizes of magnetic media, with the magnetic media receiving track positioned relative to the poles such that adjacent like poles are arranged on each side of the gap to counteract fringing effects. The bulk degaussing method for erasing various sizes of magnetic media provides a plurality of fixed magnetic pole pairs for generating uniform magnetic field elements on one or more sides of a degaussing region projecting magnetic flux into the region, and arranges the plurality of fixed poles so that adjacent poles counteract fringing effects. The described embodiments provide for generation of single uniform fields, and to non-interacting systems of such fields, through the application of arrays of magnetic poles having simple geometry. Specifically, the arrays address problem…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.