Patent ID: 9010649
Filing Date: 2015-04-21
Classification: G06K,H02J,H04B

Abstract:
1. In an IC card which performs contactless communication with an external device, the external device having a first battery and a first carrier wave output device to output carrier wave using electric power of the first battery, the IC card, comprising: a second battery; a second carrier wave output device which outputs carrier wave using electric power of the second battery, to supply electric power to the external device; a battery remaining capacity reading processor to acquire information indicating a remaining capacity of the first battery from the external device; a comparing processor to compare the remaining capacity of the first battery with a remaining capacity of the second battery; and a carrier wave switching request processor which requests switching of the output of the carrier wave to the external device so that the first carrier wave output device outputs the carrier wave, when the second carrier wave output device outputs the carrier wave and the remaining capacity of the first battery is larger than the remaining capacity of the second battery.