Patent ID: 8081908

Claim:
A toner bottle comprising a cylindrical toner container having therein a toner comprising at least a resin, a colorant and an external additive, the toner container having a toner discharge port on an end thereof and a rotation axis along the cylindrical toner container, and the toner container being installable in an image forming apparatus, wherein the toner container has plural protrusions which are intermittently provided in an interior of the cylindrical container, the protrusions having a function to convey the toner toward the toner discharge port when the toner container is rotated around the rotation axis; an X-ray intensity ratio of titanium to silicon (Ti/Si) determined via X-ray fluorescence spectrometry of the toner is 1.0 to 3.0; a conveyance index of the toner is 2.0 to 10.0 mg/sec; and 5 to 50% of toner particles have a ratio of (a 2 nd short axis):(a 1 st short axis) being 1.1:1 to 1.6:1, provided that: 1) a maximum length of a line segment between points A 1 and A 2 is designated as a long axis of a toner particle when a closed curve to form a contour of a projection plane of at least one of the toner particles is held between two parallel lines so as to make contact with points A 1 and A 2 ; 2) a line segment between points B 1 and B 2 is designated as the 1 st short axis of the toner particle when a midpoint of the line segment between points A 1 and A 2 is represented by point B, and points at the intersections of a perpendicular bisector of the line segment between points A 1 and A 2 passing through point B with the closed curve are represented by points B 1 and B 2 , respectively; and 3) a longer length of either a line segment between points C 11 and C 12 or a line segment between points C 21 and C 22 is designated as the 2 nd short axis of the toner particle when a midpoint of a line segment between points A 1 and B is represented by point C 1 , and points at the intersections of a perpendicular bisector of the line segment between points A 1 and B passing through point C 1 with the closed curve are represented by points C 11 and C 12 , respectively, and also a midpoint of a line segment between points A 2 and B is represented by point C 2 , and points at the intersections of a perpendicular bisector of the line segment between points A 2 and B passing through point C 2 with the closed curve are represented by points C 21 and C 22 , respectively.