Patent ID: 6749289
Filing Date: 2004-06-15
Classification: B41J

Abstract:
A liquid ejection apparatus comprising:a substrate having one side and another side; a plurality of nozzles formed in a member provided on said one side of said substrate; a plurality of droplet ejection units, each corresponding to one of said plurality of nozzles, said plurality of droplet ejection units being formed on a surface of said one side of the substrate; a plurality of individual flow paths, each feeding liquid to one of said plurality of nozzles, said plurality of individual flow paths being formed on said one side of the substrate; one or more front surface feed paths for feeding liquid correspondingly to said plurality of individual flow paths, said one or more front surface feed paths being formed by etching process from the surface of said one side of the substrate; and one or more back surface feed paths communicating with said one or more front surface feed paths, said one or more back surface feed paths being formed by sandblast process from a surface of said another side or the substrate, wherein: said plurality of individual flow paths are defined by a plurality of partition walls separating said plurality of nozzles from one another, said plurality of partition walls being formed on said one side of the substrate; and said plurality of nozzles are each bored in a member laminated on said plurality of partition walls and an expression: 5H+h&gE;L&gE;2H+h â€ƒis satisfied while H is 6 &mgr;m or less and h is 10 &mgr;m or less, wherein H stands for a height of each of said plurality of partition walls, h stands for a length of each of said plurality of nozzles, and L stands for a distance from an end portion of said one or more front surface feed paths that is toward each of said plurality of individual flow paths to each of said plurality of droplet ejection units.