Electronic apparatus case having an electro-magnetic wave shield

Details Electronic apparatus case having an electro-magnetic wave shield Electronic apparatus case having an electro-magnetic wave shield

1994-08-17

1996-07-23

Kincaid, Kristine L.

Electricity: conductors and insulators

Anti-inductive structures

Conductor transposition

361800, 361818, 455300, H05K 900

Patent

active

055391486

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.

REFERENCES:
patent: 3742176 (1973-06-01), Ishino et al.
patent: 4116906 (1978-09-01), Ishino et al.
patent: 4681712 (1987-07-01), Sakakibara et al.
patent: 5170009 (1992-12-01), Kadokura
patent: 5198138 (1993-03-01), Yamamoto et al.
patent: 5260128 (1993-11-01), Ishii et al.
patent: 5285007 (1994-02-01), Deluca et al.

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