Patent ID: 8833901
Filing Date: 2014-09-16
Classification: B41J,H01L

Abstract:
1. A liquid ejection head, comprising: a chip comprising an ejection orifice member including an ejection orifice for ejecting liquid, a substrate including an energy generating element for generating energy for ejecting liquid from the ejection orifice, and an electrode terminal for receiving electric power; an electric wiring board including lead wiring electrically connected to the electrode terminal; a support member for supporting the electric wiring board, the support member having an opening which surrounds the chip; a chip periphery sealing member which fills a gap between the chip and the support member in the opening; and an electrically connecting portion sealing member which is disposed in contact with the chip periphery sealing member and which covers an electrically connecting portion between the chip and the electric wiring board, wherein the electrically connecting portion sealing member comprises a cured product of a material for forming the electrically connecting portion sealing member containing filler, the chip periphery sealing member comprises a cured product of a material for forming the chip periphery sealing member containing at least one kind of a polyether-modified polydimethylsiloxane, a polyester-modified polydimethylsiloxane, and an aralkyl-modified polymethylalkylsiloxane, and the chip periphery sealing member and the electrically connecting portion sealing member have a difference in coefficient of linear expansion of 50 ppm/° C. or more.