Kitagawa Industries Co., Inc.

Toyota Jidosha Kabushiki Kaisha

Taichi Ishihara

Toru Matsuzaki

Akira Mori

Takashi Fujimaki

In a magnetic shield material including a magnetic layer containing a magnetic material and an electrically conductive layer containing an electrically conductive material, the electrically conductive layer is designed to have a thickness corresponding to a frequency band of electromagnetic wave to be shielded. More specifically, the thickness of the electrically conductive layer (thickness of the aluminum foil in the drawing) is designed to have a thickness to maximize magnetic field shield effect of the magnetic shield material (thickness of the aluminum foil corresponding to peak value frequency in curve E in the drawing) in a frequency band of electromagnetic wave to be shielded. This makes it possible to obtain good magnetic field shield effect of the magnetic shield material in the frequency band of electromagnetic wave to be shielded.

Magnetic shield material

Provided is an electromagnetic wave suppression sheet that contains from 400 to 600 parts by weight of a metal magnetic powder having an oxidized coating film formed on a surface thereof, from 1 to 15 parts by weight of a chelating agent, and from 1 to 10 parts by weight of an anti-aging agent, per 100 parts by weight of chlorinated polyethylene.

Electromagnetic wave suppression sheet

This power receiving device includes a magnetic shield, and the magnetic shield includes: a first magnetic sheet located beside the power receiving unit; a conductive sheet located opposite to the power receiving unit with the first magnetic sheet interposed therebetween; and a second magnetic sheet located opposite to the first magnetic sheet with the conductive sheet interposed therebetween.

Growing community of inventors

Kasugai, Japan

Taichi Ishihara