| 摘要 |
PURPOSE:To enable to obtain an image with high resolution, by a method wherein a magnetic brush of a magnetic toner is provided on a linear form member by a magnet provided in a non-magnetic sleeve, and an image signal pulse voltage is impressed on stripe form electrodes to produce a toner image on a recording member. CONSTITUTION:The toner 17 is supplied to the linear form member 18 by rotating a magnet roller 11, and while rotating an electrode drum 19, pulse voltages are impressed selectively on annular stripe electrodes 20, whereby electric charges are induced in a belt form magnetic brush provided on the member 18 at tip parts located on the stripe electrodes 20, a toner image is formed on an insulating layer 28, is transferred by a transferring device 23 onto a paper provided in a paper-supplying tray 22 synchronized with the rotation of the drum 19, and residual toner is cleaned by a device 24. In this case, the electric charges are induced only in the toner present at the magnetic brush part on the electrodes on which the pulses are impressed, and no electric current is leaked to the toner present on the insulating layer. Accordingly, an image with resolution approximately equal to the density of the stripe electrodes can be obtained without any lowering in the toner concentration, and the device can be constructed in a highly reliable simple construction. |
