| 摘要 |
PURPOSE:To ameliorate gradation by using at least 2 kinds of carriers different in electric conductivity and triboelectrifying them with a toner. CONSTITUTION:A charge is generated on each surface by triboelectrifying the toner and the carrier. When the carrier high in conductivity is used, the surface potential generated by triboelectrification is gradually lowered from the initial potential by diffusion into the inside of the carrier or discharging out of the carrier as the time elapses. In the case of the carrier low in conductivity, it is difficult to diffuse the charge or discharge, and the surface potential is not so much lowered. Therefore, when the conductivity of the carrier is high, the toner holding force is weak, and when low, the holding force is storing, thus permitting the distribution width of the toner holding forces to be set wide by using various kinds of carriers different in conductivity. |
