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AssigneeMita Industrial Co., Ltd.
InventorsMasahide Inoue, Mamoru Kato, Koichi Tsuyama, Koji Murata, Yutaka Aso
Estimating the term…
A developing method using a compact machine such as a copying machine for personal use, etc., employs a two component-type magnetic developing agent with small diameter photosensitive drum and small diameter developing sleeve. In order to eliminate toner falling from the drum and/or sleeve to increase toner transfer efficiency and reduce fogging, the developing agent conveying sleeve is provided with a curvature (mm.sup.-1) of from 0.2 to 0.05. The toner is specifically designed for use in the method and includes magnetic fine particles having a saturation magnetization of not smaller than 70 emu/g and hydrophobic fine silica particles added to fixing resin particles containing a coloring agent.
A developing method which uses a photosensitive drum of a small diameter, a developing agent conveying sleeve of a small diameter and a two component-type magnetic developing agent, wherein the developing agent conveying sleeve has a curvature (mm.sup.-1) of from 0.2 to 0.05, and a toner in the two component-type magnetic developing agent is one that is obtained by externally adding magnetic fine particles having a saturation magnetization of not smaller than 70 emu/g and hydrophobic fine silica particles to fixing resin particles that contain at least a coloring agent.
A toner for a two component-type magnetic developing agent which is adapted to a developing method using a photosensitive drum of a small diameter and a developing agent conveying sleeve of a small diameter, characterized in that said toner comprises fixing resin particles which contain at least a coloring agent, and particles of an externally added agent, wherein the added agent particles comprise:
Dependencies are inferred from the claim text.