Developing process

摘要

Disclosed is a process for developing an electrostatic latent image, which comprises forming a magnetic brush of a two-component type developer comprising a toner and a magnetic carrier on a developing sleeve and bringing the magnetic brush into sliding contact with a photosensitive drum, wherein a spike-cutting plate is arranged along the developing sleeve to adjust the spike length of the magnetic brush, a detecting mechanism is arranged in a development apparatus to detect the concentration of the toner by measuring the permeability of the developer, the magnetic carrier used has a saturation magnetization not higher than 50 emu/g but not lower than 40 emu/g, and the ratio (do/dl) of the distance (do) between the spike-cutting plate and the developing sleeve to the distance (dl) between the photosensitive drum and the developing sleeve is set in the range of from 0.80 to 0.85, whereby the toner concentration is detected by the detecting mechanism and the development is carried out at a predetermined toner concentration.