Toyoda Gosei Co., Ltd.

Toru Kanto

Shinichiro Fuki

Minoru Shibata

Yuji Kuriyama

Makoto Sato

Toshiaki Watanabe

Jun Imai

Shin-Ichiro Matsuzawa

Provided is a power transmission device that has a simple structure and suppresses magnetic field leakage from a power transmission coil while suppressing excessive increase in the outer shape and the weight of the power transmission device. A power transmission deviceincludes: a power transmission portionincluding a power transmission coiland a housingmade of metal and having a peripheral wallsurrounding the power transmission portion. A shielding portionprotruding inward of the peripheral wallis integrated with, of the peripheral wall, a top endlocated on a power reception coilplacement side.

Power transmission device

To realize a vertical type wireless charging device capable of detecting a metal foreign object. The wireless charging device comprises a holder, a power transmission coil, a thermal sensor, a controller, and a warning device. The power transmission coil is disposed outside the side part of the holder. The thermal sensor is disposed at the bottom part of the holder. When the temperature rising rate is not less than 20&#xb0; C. per five minutes, the controller judges that a metal foreign object exists between the power transmission coil and the electronic device, and the foreign object generates unusual heat. The controller stops wireless charging from the power transmission coil to the electronic device. The controller starts the warning device to alert the user that a foreign object is mixed in the holder and generates unusual heat.

Wireless charging device

A wireless power feeder includes a power feeding circuit, two or more power receiving circuits, and an electromagnetic field coupling circuit. Each power receiving circuit includes a resonant circuit having a load, a power receiving coil, and a capacitor connected in series to each other. The power feeding circuit includes a resonant circuit having a power feeding coil and a capacitor connected in series to the power feeding coil. The power feeding coil includes surrounding portions equal in number to the power receiving coils. The surrounding portions are disposed such that one surrounding portion surrounds one power receiving coil. Adjacent surrounding portions are connected to each other.

Wireless power feeder

A light emitting display device, which is applied to a vehicle provided with an airbag device having an airbag accommodated in a folded state and an airbag cover with a shape of covering a vehicle interior of the airbag, the light emitting display device includes: a light emitting display part provided to the airbag cover, the light emitting display part configured to emit light using supplied power; a power feeding device including a power reception coil and a power transmission coil, the power feeding device configured to supply power to the light emitting display part in a non-contact manner, wherein: the power reception coil is provided to the airbag cover in a state of being integrated with the light emitting display part; and the power transmission coil is arranged at a position out of a range, in which the airbag is deployed, when the airbag device is operated.

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Kiyosu, Japan

Toru Kanto