An arithmetic control circuit stores a set of coordinate values of a plurality of points for defining a coordinate input area in an arbitrary space in advance, and determines whether a three-dimensional coordinate value as the position coordinates of the indicating tool belongs to the coordinate input area defined by the stored set of coordinate values. The reverse fluid bypass circuit may restrict or stop the flow of fluid through the fluid passageway as long as the pressure differential across the fluid passage is below a. The blocking wall extends in a direction intersecting with a conveyance direction of a recording medium.