A radiation detecting cassette includes an IC card detector which detects insertion of an IC card in a slot, outputs a detection signal representing that the IC card is inserted in the slot, and reads ID information stored in the IC card. When an input signal is entered into an nth register, a supply of power to at least a portion of registers other than the nth register is stopped. A communicating unit 1 sends and receives communication data including a length field and a data field. The edges of adjacent panels overlap to form seams with the overlapped edges of the panels being crimped to form recesses to receive the overlapping edge strip of an adjacent panel, thereby hiding the overlapping panel edge to reduce shadow lines and make the panel edges inconspicuous to viewers. The controlevaluation unit uses the frequencyphase curve ) of the unit which can oscillate to determine the viscosity of the medium. After that, a silicon nitride layer is formed on both the first spacer and the peripheral logic region.