| 摘要 |
PURPOSE:To prevent change of erection of a magnetic brush due to environmental variation, and to develop an electrostatic latent image without deteriorating the image due to change of toner concentration, by using a developer consisting of a magnetic toner and 70-300mum magnetic resin particles. CONSTITUTION:A photosensitive drum 5 is developed with a magnetic brush and a developer 7 consisting of a 5-50mum magnetic toner 3 and a 70-300mum particle diameter brush erection-accelerating component 4. When the developer 7 is carried on a sleeve 2, the component 4 is larger than the toner 3 in particle diameter, and higher in moving speed on the sleeve, stirring the toner 3 on the sleeve. A good high concentration toner image to be formed almost likewise in the wide range of the component/the toner wt. ratio of 80:20-10:90. |
