Mitsumi Electric Company Ltd.

Akemi Kato

Tsutomu Ito

Yoshiaki Imano

Akira Yoneya

Junichi Noro

An antenna device that can surely prevent water from coming into the part where the transmission table is introduced and allows the number of parts to be reduced so that the cost can be reduced. The antenna device includes an antenna module that receives radio waves transmitted from a satellite, a cover member having a sufficient internal space to store the antenna module and its bottom opened, and a bottom plate to close the open bottom of the cover member. The transmission cable is connected to the antenna module. The transmission cable is inserted from the hole provided at the cover member and sealed by a seal material including silicon resin in the hole. The bottom plate is made of a metal plate and a magnet plate and the magnet plate has projections to position the magnet. After the bottom plate is attached, a composite resin material is filled and the cover member has its bottom side sealed.

Antenna device

An antenna device that can suitably be provided on the exterior of a vehicle is provided with low cost. An antenna case includes a top cover and a bottom plate joined with each other. The top cover stores an antenna module that receives a signal and a packing member provided at the joining part between the top cover and the bottom plate to keep the antenna case tightly sealed. The antenna case has a notch positioned at the joining part through which a signal line is externally extended, and the packing member integrally forms a base part that covers the entire surface of the antenna module and a gasket part that covers the outer periphery of the signal line connected to the antenna module in the position of the notch.

In an antenna unit ( ) comprising a circuit board ( ) having a principal surface ( ) and a back surface ( ) and an antenna element ( ) mounted on the principal surface of the circuit board, a helical antenna having an axial direction extending in substantially parallel with the principal surface is used ad the antenna element ( ). A shield cover ( ) is added to the circuit board at the back surface ( ) so as to cover circuit elements ( ) and shields the circuit elements arranged on the back surface of the circuit board. An output cable ( ) is connected to the circuit elements inside the shield cover and is pulled out of the shield cover. The circuit elements include a low-noise amplifier (LNA) circuit ( ).

Growing community of inventors

Akita, Japan

Akemi Kato