Patent ID: 9211715
Filing Date: 2015-12-15
Classification: B41J

Abstract:
1. A liquid ejection head comprising: a recording element substrate provided with a substrate and a flow-path-forming member forming a flow path in a principal surface of the substrate; a support member supporting the recording element substrate; and an underfill material covering at least a joint portion at which the substrate and the support member are joined to each other, wherein the recording element substrate is arranged in a depressed portion of the support member to form a space between a side surface of the recording element substrate and a side wall of the support member forming the depressed portion opposing the side surface, wherein the underfill material does not completely fill the space between a side surface of the recording element substrate and a side wall of the support member forming the depressed portion opposing the side surface, wherein the flow-path-forming member has an end portion which projects from at least one side surface of the substrate, and wherein the underfill material covers an external surface of the joint portion and covers the at least one side surface of the substrate in such a manner that the underfill material reaches the projecting end portion of the flow-path-forming member.