Patent ID: 6226484
Filing Date: 2001-05-01
Classification: G03G

Abstract:
A developing unit, comprising:a case for accommodating toner which contains pigment by 5 wt %, or more, contained within said case;a developing roller rotatably supported by said case through a shaft;a supply roller rotatably supported by said case through a shaft and formed by an elastic member arranged to be pressed against said developing roller in such a manner as to supply toner to the surface of said developing roller; anda restraining blade for restraining a quantity of toner on said developing roller, whereinsaid toner contains a first and second additive, a covering ratio of said first additive and a covering ratio of said second additive in said toner to surfaces of matrices in said toner are not lower than 0.1, and an apparent density of the toner is 0.30 g/cc or higher.