Nippon Sheet Glass Company, Limited

Tatsumi Tokuda

Kosuke Tanaka

Hideaki Oshima

Daisuke Arai

Ryokichi Doi

Yuji Baba

Hiromasa Morishita

A rear glass according to the invention is for attachment to a lift-up backdoor that closes an opening in a rear portion of a vehicle, and includes a glass plate, a defogger disposed in a vicinity of a center of the glass plate in an up-down direction, and a shared antenna installed on the glass plate upward or downward of the defogger, the shared antenna including a power supply unit, an AM antenna connected to the power supply unit, and an FM antenna connected to the power supply unit, and a relationship between an element length Lof the AM antenna, a center wavelength &#x3bb;corresponding to a reception frequency band of the FM antenna and a wavelength shortening coefficient &#x3b1; of the glass plate satisfying 0.49&#xd7;&#x3b1;&#xd7;&#x3bb;&#x2264;L&#x2264;0.67&#xd7;&#x3b1;&#xd7;&#x3bb;.

Rear glass

A rear glass according to the present invention is a rear glass that is attachable to a resin lift-up back door in a rear of a vehicle, the rear glass including a glass plate, a defogger that is arranged in the vicinity of a center of the glass plate in an up-down direction, and an AM antenna that is arranged upward of the defogger on the glass plate, in which the AM antenna includes a power supply part and an antenna element that extends from the power supply part.

A glass antenna with improved reception sensitivity was provided. A glass antenna formed on a surface of a window of a motor vehicle includes: an FM antenna element; and a heater that is capacitively coupled to the FM antenna element, and includes a plurality of heating wires, wherein a distance S between the FM antenna element and the heater is more than 40 mm.

Glass antenna

A glass antenna device having an AM and FM antennas provided on a rear window glass panel on which a defogger is formed is provided, the sensitivity and directivity of the device being improved. The device comprises a defogger provided on a rear window glass panel of the motor vehicle, an AM antenna provided in a space other than the defogger on the rear window glass panel, an FM antenna provided in a space between the defogger and the AM antenna on the rear window glass panel, a two-input amplifier for amplifying signals received by the AM and FM antennas, an AM lead wire for connecting between a feeding terminal of the AM antenna and the amplifier, an FM lead wire for connecting between a feeding terminal of the FM antenna and the amplifier, and an inductor inserted in the AM lead wire near to the AM feeding terminal.

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Tokyo, Japan

Tatsumi Tokuda