Patent ID: 9457573
Filing Date: 2016-10-04
CPC Classification: B41J

Claim Text:
1. A method of manufacturing a liquid ejection head having an ejection port through which liquid is ejected, the method comprising: (a) forming a hole in an SOI substrate including a first silicon layer, a second silicon layer, and a silicon oxide layer interposed between the first and second silicon layers such that the hole extends through the first silicon layer and the silicon oxide layer to the second silicon layer; (b) forming a first protective film on the first silicon layer and an inner wall of the hole to protect the first silicon layer against the liquid; (c) forming a water-repellent film on the first protective film; (d) attaching a support substrate to part of the water-repellent film facing away from the first silicon layer; (e) removing the second silicon layer to remove a bottom of the hole; (f) removing part of the water-repellent film disposed on the inner wall of the hole; and (g) releasing the support substrate from the water-repellent film.