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Electromagnetic wave absorbing sheet
| Details |
Inventors: Matsumura, Kazuhito; Yoshida, Kenichi; Iwai, Tohru; Nakata, Hidekazu; Yoshizawa, Masato;
Assignee: Japan Science and Technology Corporation (Saitama Prefecture, JP); Sumitomo Electric Industries, Ltd. (Osaka Prefecture, JP); Kanto Wire Products Corporation (Tochigi Prefecture, JP); Matsumura; Kazuhito (Tochigi Prefecture, JP)
Primary Examiner: Dinkins; Anthony
Assistant Examiner: Oliva; Carmelo
Attorney, Agent or Firm: Wenderoth, Lind & Ponack, L.L.P.
An electromagnetic wave absorbing sheet S is disclosed. The absorbing sheet S includes a laminated-structural layer of a nonwoven fabric sheet 10 and a metallic layer 22 such as iron, aluminums, copper or their alloy which is disposed on a bottom surface of the metallic layer 22. The nonwoven fabric sheet 10 includes non-metallic fibers 16 having no binding faculty, non-metallic binding fibers 14 having binding faculty which are melted by heat to bind neighboring fibers, and metallic fibers 12 having an irregular cross-section and being produced by shaving a metallic wire or rod, that are dispersed uniformly in the nonwoven fiber layer or layers. |
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DETAILED DESCRIPTION A principal object of this invention is to provide an electromagnetic wave absorbing sheet which, comprises a nonwoven fabric sheet including one or a plurality of nonwoven fiber layers, each layer comprising non-metallic fibers having no binding faculty, non-metallic binding fibers having binding faculty which are melted by heat to bind neighboring fibers, and metallic fibers having an irregular shape in cross-section and being produced by shaving a metallic wire or rod, that are dispersed uniformly in the nonwoven fiber layer or layers; and a metallic layer having electromagnetic wave reflecting faculty and disposed on an outer bottom surface of the nonwoven fiber layer or layers.
Another object of this invention is to provide an electromagnetic wave absorbing sheet, which can be provided at a given radiator of electromagnetic waves.
Still another object of this invention is to provide an electromagnetic wave absorbing sheet, which can be fabricated at a low cost.
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