A substrate is prepared that includes substrate segments arranged in series in the X and Y directions. The element is made from a material having a greater linear thermal expansion coefficient than the foil material. In particular, the progression of kidney disease essentially can be halted and the severity of kidney disease can be reduced by the administration of iron chelators to humans afflicted with a progressive kidney disease. By using the current-mirror circuit and the switching element to allow a current to flow into or from a junction of the heating resistors, the amounts of currents supplied to the heating resistors are controlled and the direction of ejected liquid is controlled. A shielding projection that shields the reflected light from the reflector deflected by the horizontal plane is formed in a position of the horizontal plane that is apart from the front end edge of the upward reflecting surface to a rear side. The support assembly is configured as a single support, which only holds a single piezoelectric stack with two associated connection pins.