Degaussing apparatus with highly uniform magnetic field
US8345402B2 · kind B2 · utility
1Cited by
4References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 18, 2010 |
| Grant date | Jan 1, 2013 |
| Priority date | — |
| Expiry date | Jan 17, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/0245
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Generation of an intense magnetic field to erase high coercivity magnetic media uses delivery of energy to a degaussing cavity. To conserve energy storage and delivery requirements and to obtain a desired magnetic strength generally uniformly within the cavity, strategic placement of supplemental turns at ends of the magnetic field generating coil wound around the cavity can promote uniformity. Construction of at least cavity ends from an adequate quantity of magnetically soft ferrous material can also promote uniformity. A combination of both approaches is possible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.