| 摘要 |
PURPOSE:To add appropriate triboelectric quantity to toner by making a shaped grain whose mean grain diameter is large collide so that a recessed part having a protruding surface which is made blunter than the protruding surface of a projecting part may be formed. CONSTITUTION:A developing device 3 is provided with a hopper 10 which is a container where the toner is contained and a non-magnetic developer carrier(sleeve) 7 which rotates outside a magnet 8. The surface of the sleeve 7 is formed to have the protruding surface which is roughed with the sharp projection at fine pitch by making a shapeless grain having a sharp angle collide with the surface of the sleeve 7 and to have the corrugated recessed and projecting part at large pitch by coming into collision with the shaped grain having the smooth surface, whose mean grain diameter is larger than that of the shapeless grain, and the protruding surface of the recessed part is blunter than that of the projecting part. Thus, the toner is prevented from being unevenly applied on the sleeve 7 and the appropriate triboelectric quantity is added to the toner, thereby obtaining a stable image without depending on environment. |
