Patent ID: 9177180
Filing Date: 2015-11-03
Classification: G06K

Abstract:
1. An RF tag reader comprising: a communication section having a first communication mode in which processing of acquiring identification ID of an RF tag, is executed for an RE tag whose identification ID is not acquired yet in a predetermined group; an omission-in-reading determining section determining that an RF tag belonging to the group might be unread when identification ID is not acquired by the communication section from the RF tag, within a predetermined time after identification ID of any one of other RF tags belonging to the group is acquired; a marking section matching identification information, which is stored in advance in a predetermined storage region and corresponds to the RF tag that might be unread, to mark information, which indicates that there is a possibility of an omission in reading, when the omission-in-reading determining section determines that there is a possibility of an omission in reading; a common information generator generating tag selection data used for performing selective communication with an RF tag, in which the identification information is matched to the mark information, on the basis of the identification information of the RE tag, in response to a user's request; an omission-in-reading reference acquisition section which acquires an information regarding an omission-in-reading reference, which is a reference for the number of RF tags whose identification ID might be unread; an omission-in-reading number determining section which determines whether or not the number of RF tags in which the identification ID is matched to the mark information, in one group is smaller than the omission-in-reading reference using the information regarding the omission-in-reading reference acquired by the omission-in-reading reference acquisition section; wherein communication section further has a second communication mode in which identification ID acquisition processing is selectively executed for an RF tag which belongs to the one group and in which the identification ID is matched to the mark information, and an RF tag which belongs to another group associated with the one group and in which the identification ID is matched to the mark information, using the tag selection data, if the omission-in-reading number determining section determines that the number of RF tags in which the identification ID is matched to the mark information, in the one group is smaller than the omission-in-reading reference; and wherein the RF tag reader further comprises a last acquisition marking section which marks an identification ID acquired last in the first communication mode before the second communication mode is executed, wherein the communication section acquires an identification ID as tag information of an RF tag.