Liquid eject head, cartridge and image forming apparatus, and manufacturing method of liquid eject head

摘要

In order to avoid damages or deformations of eject energy generating elements formed on a substrate or a grooved plate, when the substrate and the grooved plate are joined, a liquid eject head for an image forming apparatus comprises as follows is proposed: the substrate having electro-thermal energy conversion elements thereon, the grooved plate where grooves are formed at corresponding positions to the above-mentioned electro-thermal energy conversion elements and eject ports communicated to the respective grooves are formed, wherein liquid paths communicated to the above-mentioned eject ports are formed so as to form the liquid eject head where liquid droplets are ejected from the above-mentioned liquid paths wherein; at least two protrusions formed on the substrate apart from each other and corresponding engaging recessed portions formed on the grooved plate for engaging with the above-mentioned protrusions, wherein; a height from the surface of the substrate to upper ends of the above-mentioned protrusions is set higher than a height from the surface of the substrate to upper ends of the above-mentioned micro processed portion.