Patent ID: 8449370

Claim:
A game device comprising: a game table where a plurality of laying positions are disposed and a desired number of game media assigned with predetermined identification information can be placed at any of the laying positions; a plurality of readers that are disposed at the plurality of laying positions, each reader sequentially radiating electromagnetic waves with different power levels in a direction passing through a corresponding laying position and being used to read the identification information from the game media placed at the laying positions, wherein extents of magnetic fields of the electromagnetic waves are varied according to the power levels; a controller that performs the process of reading the identification information from the game media placed at the laying positions by driving and controlling the plurality of readers, changing the power levels of the electromagnetic waves, and causing the electromagnetic waves to be radiated from the readers; a storage unit that stores the identification information that has been read by the controller as data for each reader by relating the data to the power level of the electromagnetic waves radiated by the reader; and a collating unit that identifies the game medium placed at the laying position by using the data of the different readers stored in the storage unit in order to collate the data of the adjoining readers with each other, wherein each reader sequentially radiates the electromagnetic waves with the different power levels by radiating a first electromagnetic wave with a first power level at a first time and radiating a second electromagnetic wave with a second power level that is different from the first power level at a second time subsequent to the first time, wherein one of the first and second electromagnetic waves passes through at least one game medium placed on the corresponding laying position and does not pass through at least one game medium placed on a laying position adjacent to the corresponding laying position, and the other of the first and second electromagnetic waves passes through the at least one game medium placed on the corresponding laying position and passes through the at least one game medium placed on the laying position adjacent to the corresponding laying position, wherein the storage unit stores identification information read from the game media at each of the different power levels in each reader, and wherein the collating unit determines a power level at which the readers of the adjacent laying positions do not read overlapped identification information from among the different power levels, and identifies the game medium on each of adjacent laying positions based on identification information read at the determined power level.