Patent ID: 7261397

Claim:
An ink jet recording head comprising: a container holding member to which a liquid accommodating container for accommodating a liquid is attached; and a flow path forming member connected to said container holding member, wherein a plurality of liquid flow paths communicating with said liquid accommodating container are formed between said container holding member and said flow path forming member that have been connected together, wherein at least one of said container holding member and said flow path forming member is formed with a recessed portion for forming said liquid flow path, wherein at least one of a junction surface portion of said container holding member and a junction surface portion of said flow path forming member has a protruded portion assuming a protruded shape from non-connected surfaces of said members having said junction surface portions, and wherein said flow path forming member is composed of a resin exhibiting transmissivity of laser beam, wherein a non-transmissive material exhibiting none of transmissivity of the laser beam exists in at least a junction area of said container holding member between said container holding member and said flow path forming member, wherein the non-transmissive material emits heat by irradiating a periphery of said ink flow path with the laser beam from the side of said flow path forming member in a state where said flow path forming member is pressure-welded to said container holding member, and wherein said junction surface portion of said container holding member and said junction surface portion of said flow path forming member are welded, thereby forming said liquid flow path; and wherein at least one of said junction surface portions has a laser beam absorptive agent heated when irradiated with the laser beam and melting said junction surface portion of said container holding member and said junction surface portion of said flow path forming member.