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. 20, 2018
Filed:
Mar. 05, 2018
Beken Corporation, Shanghai, CN;
Mingsheng Ao, Shanghai, CN;
Jiazhou Liu, Shanghai, CN;
BEKEN CORPORATION, Shanghai, CN;
Abstract
A card detector configured to be communicatively coupled to a card reader comprises: a first comparator configured to output periodically a first comparison result by comparing a voltage for a device under test with a first reference; a second comparator outputs periodically a second comparison result by comparing a second reference voltage with the first reference voltage, wherein the second reference voltage is adjustable; a decision circuit communicatively coupled to both the first comparator and the second comparator, and decides whether a card is in proximity to the card detector by comparing the time delay relationship between the first comparison result and the second comparison result respectively at a first time point and a second time point different from the first time point, and further wakes up the card reader if the decision circuit decides that the card is in proximity to the card detector.