| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent an ID from changing even after printing 1000 sheets, and a stripe-shaped uneven density or a missing of an image from occurring, by means of letting magnetic toner directly soar onto a recording medium by the DC electric field, without adopting a photoreceptor. SOLUTION: As for this method, the image formation by means of letting the magnetic toner 4 on a toner carrier 2 directly soar in accordance with the image pattern is performed by forming a thin layer of the magnetic toner 4 by a controlling member 3 on the toner carrier 2 including a magnetic material 1, and equipping a controlling electrode 7 controlling passing of the toner 4 between this toner carrier 2 and a recording medium 6 arranged along a rear side electrode 5. In such a case, the magnetic toner 4 on the toner carrier 2 is provided with powders consisting of at least binding resin, a magnetic powder and the electric charge controlling agent, hydrophobic silica is at least, stack and/or fixed on the surface of the powder, and this hydrophobic silica in its particle size distribution, the particle ratio of <=5.04μm volume reference grain size is >=60 volume %, and the ratio <=20.2μm volume reference grain size is >=90 volume %.</p> |
