Patent ID: 6999705

Claim:
A toner container for supplying and/or replenishing toner into a development apparatus provided in an image forming apparatus, by being engaged with a rotation transfer member of the development apparatus and being rotated about a center axis of the toner container integrally with the rotation transfer member; the toner container comprising: a cylindrical body having a toner outlet on one end of the cylindrical body, nearby a center axis of the cylindrical body, wherein the cylindrical body has a first portion having a diameter in outer periphery of the cylindrical body smaller than a diameter of a second portion in outer periphery of the cylindrical body; a convex spiral flute formed on the inner periphery of the cylindrical body; and a concave spiral flute formed on the outer periphery of the cylindrical body, wherein a ratio L/D of length L to diameter D of the cylindrical body is in a range of ½≦L/D≦10; a thickness of the cylindrical body t is 0.3 mm≦t≦5.0 mm; and a thickness deviation of the cylindrical body is Δt≦20% and wherein the first portion has the convex spiral flute and distance between the convex spiral flute in the first portion in longitudinal direction for the cylindrical body is narrower than that in the second portion.