Patent ID: 9527281
Filing Date: 2016-12-27
CPC Classification: B41J

Claim Text:
1. A liquid ejection head comprising: a first recording element substrate and a second recording element substrate, each including: an electric wiring substrate including wiring for supplying electric power to the first recording element substrate and the second recording element substrate, wherein the plurality of sets of electroconductive protective films from the first recording element substrate and the second recording element substrate are further electrically connected to each other in parallel through the electric wiring substrate via at least one electrode terminal of each opposing end of each of the first recording element substrate and the second recording element substrate, and wherein when anodization of a portion of the electroconductive protective film in the liquid ejection head occurs due to a defect, anodization is then also caused to occur with all remaining other portions of the electroconductive protective film, thereby causing thermal characteristics of the plurality of sets of electroconductive protective films to be made uniform.