Patent ID: 7834763
Filing Date: 2010-11-16
Classification: G06K

Abstract:
1. A wireless tag reader/writer control system including: a control apparatus for transmitting signals to and receiving signals from a plurality of wireless tag readers/writers, the control apparatus having an execution table storing an electromagnetic wave radiation execution timing arrangement including the time span authorized to radiate an electric wave at a time and the radiation time intervals between radiations of electric wave for each of the wireless tag readers/writers for each clock hour, and having a count table for storing the number of wireless tags each of the wireless tag readers/writers reads in each clock hour; and a plurality of wireless tag readers/writers, each having a reader/writer main body for transmitting a signal to and receiving a signal from a wireless tag and transmitting a signal to and receiving a signal from the control apparatus and a reader/writer side execution table storing the execution of radiation time intervals between radiations of electric wave for a wireless tag; the control apparatus being adapted to transmit the execution of radiation time intervals between radiations of electric wave to each of the wireless tag readers/writers; each of the wireless tag readers/writers being adapted to store the received execution of radiation time intervals in the reader/writer side execution table; each of the wireless tag readers/writers being adapted to radiate an electromagnetic wave according to the stored execution of radiation time intervals; each of the wireless tag readers/writers transmits the read number that is the number of wireless tag it reads to the control apparatus; whereas the control apparatus updates the count table according to the received read number; so that, when the control apparatus determines that the read number stored in the count table exceeds a predetermined threshold value for any of the wireless tag readers/writers, it transmits the execution of radiation time intervals modified by increasing the time span authorized to radiate an electromagnetic wave to the wireless tag reader/writer or each of the wireless tag readers/writers having a read number exceeding the predetermined threshold value; while the wireless tag reader/writer or each of the wireless tag readers/writers stores the received execution of radiation time intervals in the reader/writer side execution table; and each of the wireless tag readers/writers radiates an electromagnetic wave according to the stored execution of radiation time intervals.