Liquid container, manufacturing method, ink jet cartridge, and ink jet recording apparatus

Abstract

A liquid container includes a polyhedron outer wall having a substantial air vent and having a corner portion defined by extensions of two surfaces thereof; an inner wall forming a liquid containing portion for containing liquid therein, the inner wall including an outer surface having a shape equivalent or similar to an inner shape of the outer wall, and having a corner portion corresponding to the corner portion of the outer wall; a liquid supply portion for supplying the liquid from the liquid containing portion to outside; wherein the inner wall and outer wall have major surfaces having maximum areas and not provided with the liquid supply portion; wherein when the liquid is discharged through the liquid supply portion, the inner wall deforms such that at least one of angles formed between one side constituting a polygonal shape in a plane perpendicular to the major surface of the inner wall of the liquid container and sides adjacent thereto, decreases, and such that angles formed between the sides forming the decreasing angle and sides which are adjacent to the decreasing angle forming sides and which are not the decreasing angle forming sides, increases.