Fujikura Limited

Masaaki Yamamoto

Moritaka Goto

Kenji Furuichi

Kazutoshi Fukada

Saiichiro Ohshita

A tire pressure detector of an automobile, comprises a magnet having N and S poles and rotated in accordance with a pneumatic pressure in a tire, the N and S poles being rotatable in reverse, detecting means, arranged opposite to the magnet, for detecting magnetism and outputting a voltage signal changed to different magnetism level in accordance with rotation of the magnet, and determining means for comparing the voltage signal with a positive or negative threshold value and determining whether the pneumatic pressure in the tire is within a suitable range, based on a polarity of the voltage signal represented by a comparison result.

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Kamagaya, Japan

Masaaki Yamamoto