Patent ID: 7100829
Filing Date: 2006-09-05
Classification: G06K,G06Q,G07F

Abstract:
1. A card reader comprising: a card entrance; a readout head for reading information recorded on a card inserted at the card entrance; an output circuit for outputting information read by the readout head; a card conveyance mechanism for discharging the card; an ultrasonic wave sensor comprising a transmitter to transmit ultrasonic waves outside the card entrance and a receiver to receive reflected waves of ultrasonic waves from a body when the body is present at the card entrance; a memory for storing as a reference duration a necessary duration from transmission of ultrasonic waves to reception in the case where a card is present outside the card entrance; and an abnormality determination unit to make a comparison between said necessary duration at the time of reception of ultrasonic waves transmitted from the transmitter when the card conveyance mechanism discharges the card and the reference duration stored in the memory, and to output presence or absence of an abnormality on the basis of results of the comparison.