Printhead, printhead substrate, ink cartridge, and printing apparatus having printhead

摘要

A printhead includes a plurality of switching elements which are arranged in correspondence with respective printing elements and control energization to the respective printing elements, a reference voltage circuit which generates a reference voltage, a current generation circuit which generates a reference current (I_ref) on the basis of a reference voltage (V_ref) generated by the reference voltage circuit, and a plurality of constant current sources which supply, in accordance with the reference current (I_ref) generated by the current generation circuit, constant currents via the switching elements arranged in correspondence with the respective printing elements.