A memory card has a plurality of non-volatile memories and a main controller for controlling the operation of the non-volatile memories. The layered formation or a printing plate includes an intermediate layer having two or more kinds of oxide semiconductors or a solid acid between a substrate and the photocatalyst layer. The preheating circuit provides a continuous small current to the multiple LED elements to preheat the LED elements when the preheating circuit detects the temperature environment is low. The fixed element is fixed to the track, and the movable element is slidably disposed on the track.