Nitto-denko Corporation

Toda Kogyo Corporation

Masataka Tada

Kenichi Ikeda

Katsumi Okayama

Kazuhiro Ikemura

Kazumi Yamamoto

Tomohiro Dote

Takashi Wano

Yuuki Fukuda

Shigehisa Yamamoto

Osamu Hashimoto

Masaharu Abe

Kazumasa Igarashi

Kaoru Kobayashi

Toshiaki Masaki

Takuya Eto

Osamu Maekawa

Yasuo Nakatasuka

Kazushi Nishimoto

An electromagnetic wave absorber includes a dielectric layer, a divided conductive film layer and an electromagnetic wave reflective layer, wherein a ratio of thickness 'd' and wavelength '&#x3bb;' satisfies a condition of [0.01&#x2266;d/&#x3bb;0.03], weight per unit area of the electromagnetic wave absorber falls within a range of 1000 g/mand 3000 g/m. The divided conductive film layer is configured such that each side's length of conductive films is dimensioned within a range of 0.5 mm and 4.8 mm and arrangement distance between adjoining conductive films is taken within a range of 0.01 mm and 3 mm.

Electromagnetic wave absorber

A flowable insulating resinis placed in a sheet-like molding die space and conductive magnetic particlesare dispersed in the insulating resin. A first magnetic field Gis acted in the sheet thickness direction on the position where a conductive path is to be formed in the die space, and conductive magnetic particlesare locally collected together to form a conductive path. Simultaneously, a second magnetic field Gis acted in the sheet thickness direction on the intermediate region and the magnetic field Gis moved in the lateral direction to move conductive magnetic particlesleft in the intermediate region to join the collection forming the conductive path. As a result, the number of the conductive magnetic particles left in the insulating resin becomes smaller.

Production method of anisotropic conductive sheet

Growing community of inventors

Ibaraki, Japan

Masataka Tada