LIQUID DISCHARGE HEAD, METHOD FOR CLEANING LIQUID DISCHARGE HEAD, LIQUID DISCHARGE DEVICE, AND LIQUID DISCHARGE HEAD SUBSTRATE

摘要

PROBLEM TO BE SOLVED: To suppress increase in size of a liquid discharge head due to arrangement of an electrode used for cleaning an upper protective film.SOLUTION: A liquid discharge head substrate 100 includes an upper protective film 107 for covering at least an area corresponding to a thermal energy generating element 104. To an upper protective film 107a and at least one upper protective film 107b of the upper protective film 107 adjacent to the upper protective film 107a in the liquid chamber 120, voltage can be respectively applied via different external electrodes different from each other.