| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the fogging of the background part of printing by constituting developer of insulating toner and conductive carrier and specifying the tensile rupture stress of an insulating toner powder layer. SOLUTION: The developer is constituted of the insulating toner and the conductive carrier, and the tensile rupture stress of the insulating toner powder layer is set to 0.1 to 1g weight/cm<2> . In such a case, the tensile rupture stress is the maximum stress in rupturing a toner cake, which is obtained by pressuring the toner powder with appropriate pressure. By using a photoreceptor formed by successively laminating a conductive layer formed of material having light transmissivity, a photoconductive layer and a surface insulating layer, nonmagnetic toner, especially, nonmagnetic color toner can be used. Furthermore, it is desirable that the surface insulating layer contains a composed electrified to have the same polarity as the toner to the carrier.</p> |
