Patent attributes
A board box 80 includes an upper lid portion 80a made of transparent resin, and a lower lid portion 80c made of transparent resin. A main control board 41 for performing main control to a pachinko game machine 1 is provided on the lower lid portion 80c. A thin and rectangular IC tag 86 is provided at the backside of the upper lid portion 80a. A coil-shaped antenna 68 for making RF transmission and reception with the IC tag 86 is provided at the lower right end portion of the main control board 41. The distance between the antenna 68 and the IC tag 86 is set to about 3 mm in the state that the upper lid portion 80a and the lower lid portion 80c are assembled. A R/W unit always polls the IC tag 86 via the antenna 68. If the upper lid portion 80a is opened and the distance between the antenna 68 and the IC tag 86 exceeds about 5 mm, the communication becomes unavailable and a fact that the upper lid portion 80a has been opened is immediately detected.
