Patent ID: 8436718
Filing Date: 2013-05-07
Classification: G06K

Abstract:
1. A noncontact communication apparatus comprising: an antenna resonance circuit configured to have a coil for communicating with an opposite party through electromagnetic coupling; changing means for changing a Q-factor of said antenna resonance circuit; control means for controlling said antenna resonance circuit to transmit and receive data to and from said opposite party at one of a plurality of communication speeds prepared beforehand, said control means further controlling said changing means to reduce said Q-factor the higher the communication speed in use; distance detection means for detecting a distance of communication with said opposite party by monitoring resonance characteristics of the antenna resonance circuit, wherein said control means controls said changing means to reduce said Q-factor the shorter the distance detected by said distance detection means; and a storage block configured to store correspondence table information indicating how distances of communication with said opposite party, said plurality of communication speeds, and Q-factors relative to combinations of said distances of communication with said communication speeds are interrelated, wherein said control means controls said changing means to change said Q-factor by referencing said correspondence table information stored in said storage block.