| 摘要 |
A device is provided with a reader/writer that wirelessly communicates with an RFID module in a con-contact manner that resides within a wireless communications area of the device, and an optical transmitter transmitting a signal receivable by the RFID module in an area in the vicinity of the device within the wireless communication area of the device, the signal receivable area being narrower than the wireless communication area. The device determines whether an ID of an RFID currently performing wireless-communication is stored in its storage as an authorized ID, or not. The optical transmitter initiates signal transmission on the condition of the determination that the corresponding ID is stored. Upon receipt of the signal from the optical transmitter by a photoreceptor, the RFID module wirelessly transmits an authentication request signal to the device. Having received the authentication request signal from the RFID module, the device authenticates the ID and authorizes the use of the device based on the establishment of the authentication. Thus, the use of the device by unspecified users can be excluded at a high ratio without impairing the convenience of users of the device. |
