Patent ID: 7591546
Filing Date: 2009-09-22
Classification: B29C,B29L,B41J,Y10T

Abstract:
1. An ink jet recording head comprising: a liquid flow path along a path which communicates between a container in which liquid is accommodated and a discharge port from which the liquid is ejected; a container holding member for holding the container; and a flow path forming member; wherein a first one of the container holding member and the flow path forming member has a recess defining at least one surface of the liquid flow path and the second one of the container holding member and the flow path forming member has a counterpart surface defining another surface of the liquid flow path; wherein at a periphery of the recess, the first one of the container holding member and the flow path forming member has a protruded portion defining a junction surface between the container holding member and the flow path forming member; and wherein in a vicinity of the junction surface, one of the container holding member and the flow path forming member is composed of a resin that transmits laser beams while the other of the container holding member and the flow path forming member is composed of a resin that absorbs laser beams; said ink jet recording head further comprising: a welded joined portion between the container holding member and the flow path forming member, wherein the joined portion is formed at the junction surface, such that the recess of the first one of the container holding member and the flow path forming member faces the counterpart surface of the second one of the container holding member and the flow path forming member, and such that the joined portion is formed by laser welding of the container holding member to the flow path forming member by irradiating a laser beam through the resin that transmits laser beams towards the resin that absorbs laser beams; whereby the liquid flow path is formed between the recesses of the first one of the container holding member and the flow path forming member and the counterpart surface of the second one of the container holding member and the flow path forming member.