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:
Jun. 20, 2017
Filed:
May. 20, 2015
Alps Electric Co., Ltd., Tokyo, JP;
Akira Miyazawa, Miyagi-ken, JP;
Ichiro Nakahara, Miyagi-ken, JP;
Katsuhiro Seino, Miyagi-ken, JP;
Yoshio Sampei, Miyagi-ken, JP;
ALPS ELECTRIC CO., LTD., Tokyo, JP;
Abstract
An electronic key device includes a portable device capable of being carried by a user, and a vehicle-mounted device configured to perform mutual communication with the portable device to perform predetermined control. The vehicle-mounted device includes a plurality of antennas that is provided in different positions of a vehicle and is configured to transmit radio waves every predetermined time. A response signal based on the reception strength of the radio waves transmitted from the plurality of antennas is transmitted from the portable device to the vehicle-mounted device. The vehicle-mounted device determines that a moving direction of the portable device heads for any one of the antennas based on the response signal, and when it is determined that a distance between the vehicle and the portable device is equal to or less than a predetermined threshold, control is performed such that a door becomes unlocked.