Patent ID: 7969283
Filing Date: 2011-06-28
Classification: G06K

Abstract:
1. An RFID tag information communicating device comprising: a device antenna for performing a transmitting/receiving operation in a radio communicating operation between a tag antenna of a specific RFID circuit element and the one antenna among a plurality of RFID circuit elements each having an IC circuit part for storing a predetermined information and said tag antenna connected to said IC circuit part and for transmitting/receiving information; a first information transmitting device for transmitting first access information which accesses RFID tag information of said IC circuit part via said device antenna to said tag antenna in a non-contact manner so as to access said RFID tag information of said IC circuit part; a first power control portion for setting a magnitude of transmission power from said first information transmitting device in response to said access operation; an access information producing device for producing said first access information; and a first judging portion for judging as to whether or not an access operation to said IC circuit part can succeed after said access operation has been executed; and wherein: said first information transmitting device transmits said first access information produced by said access information producing device via said device antenna to said tag antenna in the non-contact manner so as to access said RFID tag information of said IC circuit part; and said first power control portion controls the magnitude of the transmission power from said first information transmitting device in response to the access success/failure judging result obtained in said first judging portion, and the RFID tag information communication device further comprises: a first information receiving device operated in such a manner that after said first access information has been transmitted by said first information transmitting device, a first reply signal transmitted from said IC circuit part in response to said transmitted first access information is received via said tag antenna by said device antenna in the non-contact manner and the received first response signal is read; and an access confirmation instruction transmitting device for transmitting a confirmation instruction signal for confirming as to whether or not an access operation can access via said device antenna to said tag antenna in a non-contact manner after said first access information has been transmitted by said first information transmitting device; and wherein: said first information receiving device receives information read from said IC circuit part in response to said confirmation instruction signal via said tag antenna by said device antenna in the non-contact manner, and reads the received information; and said first judging portion inputs both the information which is produced by said access information producing device and transmitted by said first information transmitting device, and the information which is read from said IC circuit part and read by said first information receiving device, and judges as to whether or not said access operation can succeed by checking as to whether or not said transmitted information is coincident with said read information; and the RFID tag information communicating device further comprises: an instruction transmission power control portion for controlling the transmission power from said access confirmation instruction transmitting device.