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:
Nov. 26, 2019
Filed:
Jan. 18, 2017
Kabushiki Kaisha Tokai Rika Denki Seisakusho, Aichi, JP;
Tetsuya Egawa, Aichi, JP;
Toru Maeda, Aichi, JP;
KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO, Aichi, JP;
Abstract
This door locking device for a vehicle includes: an electronic key and an in-vehicle device. The electronic key stores a first threshold defining an extension of a first region in which an electric field intensity of a response request signal is strong and a second threshold for defining an extension of a second region in which an electric field intensity is weaker than the first region around the first region. The electronic key outputs, based on the electric field intensity of the response request signal and the first and second thresholds, a response signal including position information indicating whether the electronic key is in the first region, or is outside the first region but in the second region, or is outside the second region. Based on the received response signal, the in-vehicle device switches the door to an unlocked state or a locked state.