A method for supplying a granular raw material for reduced iron in which when the granular raw material is fed into a hopper and from there supplied onto a hearth of a movable hearth furnace through a material supplying device, the material supplying device is moved vertically to thereby adjust the gap between the lower end of the material supplying device and the hearth. One embodiment of a system may comprise memory that stores configuration data for a plurality of components of a computer system. A driving IC, which applies voltage to the piezoelectric element, is mounted on a piezoelectric element substrate which is formed so as to include the vibrating plate. The mirror can alternatively be mounted on other portions of a vehicle, e.