Patent ID: 7070267
Filing Date: 2006-07-04
Classification: B41J

Abstract:
1. A liquid jet recording head comprising: a recording liquid flow path communicating with a plurality of discharge ports for discharging recording liquid; a common liquid storing chamber provided with a chamber for directly storing the recording liquid supplied to said recording liquid flow path; an upper plug member as an expelling path for expelling air in said common liquid storing chamber; a lower plug member as a supply path for supplying the recording liquid into said chamber from the outside; and a filter held at an end portion of said common liquid storing chamber to remove dust particles and other matter in the recording liquid supplied from said chamber to said recording liquid flow path, wherein in use of said liquid jet recording head said filter is provided in a leading end of a filter holding member projecting above a bottom portion of said chamber, and said filter is provided close to said lower plug member so that the distance between said filter and said lower plug member is shorter than the distance between said filter and a surface opposed to a side face of said common liquid storing chamber where said lower plug member is provided, wherein a surface of said filter is extruded to be (i) spherical in a flow-in direction of the recording liquid into said filter and (ii) convex with respect to said filter holding member, wherein, in said common liquid storing chamber, said leading end of said filter holding member which supports said filter has a projecting shape toward said common liquid storing chamber, and wherein, when the recording liquid is supplied through said lower plug member into said chamber, a flow of the recording liquid is induced in the chamber in a direction from said lower plug member toward said upper plug member, the flow going over said surface of said filter, whereby colorant of the recording liquid deposited on said surface of said filter is agitated so as to be separated from said surface of said filter, and to float in the recording liquid and/or to drop toward the bottom portion of said chamber.