Electrical connection structure, liquid ejection head, method of manufacturing same, and image forming apparatus

摘要

The electrical connection structure includes: a first substrate which has a first electrode part; a second substrate which has a second electrode part opposing the first electrode part, and a wiring pattern connected to the second electrode part; an insulating cavity substrate which is disposed between the first substrate and the second substrate and has a through hole in a position corresponding to the first electrode part, the through hole being deeper that a sum of a height of the first electrode part and a height of the second electrode part and having an opening surface area not smaller that an area of the first electrode part; and conductive material which is filled in the through hole.