| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide toner which can prevent its degrading with its long time durability and suppress image flow failure in highly humid environments, damages on the cleaning blade, and contamination on the charging component, and can obtain excellent images even when using a more durable photo conductor. <P>SOLUTION: The toner particles having at least a magnetic substance and a binder resin is added with fine inorganic powder A of perovskite crystals in the shape of cubes and/or rectangular parallelepipeds of a number average size 80 nm or larger but 220 nm or smaller of the primary particles and containing aggregates 800 nm or larger in size at several% or less per piece. The number average size of the toner is 3.0 μm or larger but 10.0 μm or smaller, and the average roundness is 0.930 or larger but 0.995 or smaller. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
