Electronic apparatus case having an electro-magnetic wave shielding structure
US5539148A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 17, 1994 |
| Grant date | Jul 23, 1996 |
| Priority date | — |
| Expiry date | Aug 17, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K9/0088
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
As for an electric apparatus having a case formed of electro-magnetic wave passing-through material, in order to provide an electro-magnetic wave shielding structure being capable to effectively prevent the leakage therefrom of an electro-magnetic wave generated therein, an electro-magnetic wave reflecting layer, namely, a conductive layer is formed on an inner face of the case and further, on a surface of the conductive layer, a magnetically losing layer containing Mn--Mg--Zn group soft ferrite particles having 1 to 20 .mu.m average diameter by 70 to 90 weight % at a thickness exceeding 80 .mu.m is formed, so as to repeatedly absorb the inner generated undesired electro-magnetic wave therein through repeated reflection between the conductive layer and the absorbing layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.