The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 05, 2004
Filed:
Sep. 15, 2003
Masaki Terashima, Tokyo, JP;
Yoshiteru Hirano, Tokyo, JP;
Makoto Takemoto, Kanagawa, JP;
Akihiro Inui, Kanagawa, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A road antenna apparatus includes a road antenna which is mounted on a post and at an elevated position on a road R and establishes radio communication with an on-vehicle radio device mounted in a vehicle which is traveling over the road; a controller controls a level of a transmission output signal of the antenna based on a receiving rate of the transmission output signal. A laser-beam emitting device is mounted on the road antenna and radiates a laser beam onto the surface of the road. A laser-beam receiving device mounted on the road receives the laser beam emitted from the laser-beam emitting device. The controller stops the operation of the antenna when the laser-beam receiver device cannot receive the laser beam.