PRINT HEAD

A print head includes a first emitting element on a substrate facing a lens. A light output level of the first element is controllable to be within a predetermined range. A second emitting element on the substrate has a light output level that is not controllable to be within the predetermined range. A first driving circuit is connected to the first emitting element. A capacitor is in the first driving circuit and the current supplied to the first emitting element is set by the capacitor voltage. A second driving circuit is connected to the second emitting element to supply current to the second emitting element. A memory stores correction values for the setting of the capacitor voltages for the first and second driving circuits. When capacitor voltage for the second driving circuit is set according to the stored correction value, the capacitor voltage is less than a predetermined threshold.