Igniter assembly and gas generator using the same

An igniter assembly, comprising

• an igniter main body having an ignition portion and an electroconductive pin, a resin portion enclosing a periphery of the igniter main body, a metallic collar being arranged on a periphery of the resin portion and being integrated with the resin portion, and a cup-like shaped igniter housing enclosing at least the ignition portion and being filled therein with a gas generating agent or a transfer charge,
• the metallic collar including a combination of a cylindrical collar and an annular collar,
• the cylindrical collar including
• a first inner wall surface on the side of a first end positioned on the side of the ignition portion, a second inner wall surface on the side of a second end positioned on the side of the electroconductive pin, and an inner annular step surface between the first inner wall surface and the second inner wall surface, an inner diameter of the first inner wall surface being larger than an inner diameter of the second inner wall surface, and the second inner wall surface abutting against an outer surface of the resin portion,
• the annular collar including
• a first annular surface, a second annular surface on the opposite side of the first annular surface in a thickness direction, an inner circumferential surface and an outer circumferential surface, part of the first annular surface and part of the second annular surface including the inner circumferential surface and a center hole being embedded in the resin portion, and the remaining part of the first annular surface and the remaining part of the second annular surface including the outer circumferential surface protruding outward in a radial direction of the resin portion,
• the outer circumferential surface of the annular collar abutting against the first inner wall surface of the cylindrical collar, and the second annular surface on the side of the outer circumferential surface of the annular collar abutting against the inner annular step surface of the cylindrical collar,
• the cup-like shaped igniter housing including a smaller-diameter circumferential wall portion provided on the side of a bottom surface, a larger-diameter circumferential wall portion provided on the side of an opening and being larger than the smaller-diameter circumferential wall portion, and an annular step portion between the smaller-diameter circumferential wall portion and the larger-diameter circumferential wall portion,
• in the cup-like shaped igniter housing, an annular end surface at the opening abutting against the first annular surface of the annular collar, an outer surface of the larger-diameter circumferential wall portion abutting against the first inner wall surface of the cylindrical collar, and an outer surface of the annular step portion and part of an outer surface of the smaller-diameter circumferential wall portion contiguous to the outer surface abutting against a portion of the cylindrical collar where a diameter on the side of the first end is reduced, so that the cup-like shaped igniter housing is fixed from the outside.