A circuit board includes a metal core having a plate shape, an insulation section covering a surface of the metal core, and a heat radiation section in which the metal core is exposed and which is provided at a circumference of the metal core. The sense node is selectively connected to a memory cell to generate the sensed voltage on the sense node to represent the data stored in the selected memory cell. And an area light emitter column configured by arranging area light emitters corresponding to each color of R, G and B in the sub scanning direction, or a monochrome area light emitter is arranged repeatedly in the main scanning direction. The permeable layer enables essentially uniform distribution of the fluid into the underlying waste or contaminated area.