Magnetic shielding members
US4632250A · kind A · utility
9Cited by
9References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1984 |
| Grant date | Dec 30, 1986 |
| Priority date | — |
| Expiry date | Jul 19, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/928
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic shielding device, adapted to protect a magnetic recording member against external magnetic fields, includes a plurality of spaced apart sheets of ferromagnetic material and the total thickness of the spacings between adjacent sheets of ferromagnetic material is selected to be larger than 0.5 mm. In a modification, the spaced sheets are covered with covers and the peripheral portions thereof are welded together. In another modification a sheet of insulating material having a surface area larger than those of the sheets of ferromagnetic material is interposed therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.