Omron Corporation

Tomohiro Nishimura

Hidekatsu Nogami

Yoshimitsu Nakano

A controller in an interrogation device performs, for each RF tag passing through an interrogation zone that is defined near an interrogation unit, an integration process of integrating a strength of a reception signal from the RF tag received by the interrogation unit. The integration process includes weighting of an integral value of the strength of the reception signal in a manner to cause an integrate value calculated for each reception signal to be larger than an integral value calculated for a preceding reception signal. When an RF tag moves to a predetermined position in the interrogation zone, the controller transmits, to a host device, an identifier of an RF tag having a maximum integral value selected from the integrated value calculated for each RF tag.

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Otsu, Japan

Tomohiro Nishimura