Patent ID: 8028922

Claim:
An electronic device, comprising: a card reader into which a card is inserted and which reads out information carried on the card; a power supply unit which supplies power to the card reader; a detection unit which detects insertion of a card into the card reader and ejection of a card from the card reader; a control unit which controls the power supply unit; a main body in which at least the power supply unit and the control unit are housed; a first interface provided in the card reader; a second interface provided in the main body; and a transmission cable which connects the first interface and the second interface; wherein the supply of power from the power supply unit to the card reader is performed by using a power line included in the transmission cable; and wherein the control unit: causes the power supply unit to start a supply of power to the card reader when the detection unit detects the insertion of a card; and causes the power supply unit to shut off the supply of power to the card reader when the detection unit detects the ejection of the inserted card.