Patent ID: 7804397
Filing Date: 2010-09-28
Classification: B60C

Abstract:
1. A valve-integrated transponder comprising: a detecting element that detects a condition inside a tire; an inverse F antenna element that outputs information detected by the detecting element to an outside; a synthetic-resin supporting member that supports the antenna element; and a synthetic-resin casing that houses the detecting element, the antenna element, and the supporting member, wherein the casing is joined to an end of an air valve fixed to a valve hole in a wheel rim, the end of the air valve being located inside the tire, and wherein a longitudinal direction of each of the antenna element and the supporting member is substantially perpendicular to an axial direction of the air valve, wherein the casing is provided with a partition-like reinforcement rib extending across a space in the casing that accommodates the antenna element, the reinforcement rib extending along an extension of an axis of the air valve, wherein a central section of the antenna element in the longitudinal direction thereof is provided with a feed terminal and a ground terminal, the antenna element having a substantially line symmetrical shape where a pair of radiation conductors extend symmetrically from the feed terminal and the ground terminal toward opposite longitudinal ends of the antenna element, and wherein the supporting member has a recessed slot in which the reinforcement rib is loosely fitted, the recessed slot being located between the pair of radiation conductors.