To provide an electromagnetic wave absorbing metallic material with excellent productivity capable of efficiently absorbing high frequency noise generated on the inner surface of the case of an electronic device and saving the adhesion work of an electromagnetic noise suppressing sheet, and to provide the case for the electronic device.
The surface treatment metallic material includes on at least a part of the metallic material surface: a layer which includes a magnetic body and has a thickness being ≥1 μm and ≤100 μm; and a frequency area where a reflection attenuation amount RL is ≤-10 dB and a frequency is within a range being ≥100 MHz and ≤80 GHz. The surface treatment metallic material is manufactured by performing electrolyzation with the metallic material as a cathode through the use of a metallic ion-containing treatment liquid where the magnetic body is distributed as fine particles, so as to form the layer containing the magnetic body on the metallic material surface.
COPYRIGHT: (C)2008,JPO&INPIT
YUASA KENSHO
| JP2005005641A | 2005-01-06 | |||
| JP2004006436A | 2004-01-08 | |||
| JP2002160924A | 2002-06-04 | |||
| JP2007088121A | 2007-04-05 |
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Nagasaka Tomoyasu
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