| 摘要 |
An image density control method for electrophotography which controls at least one of various image density parameters in response to values detected from different pattern areas. The image density parameters include an amount of charge deposited on a photoconductive element by a charger, bias voltage for development, toner density in a developer, amount of toner supply to a developing unit and transfer potential. At least two pattern areas having different potentials are formed on the surface of the photoconductive element by at least one of various means for forming charge patterns which include controlling the energization of the charger, controlling an illuminating lamp and projecting an image pattern. At each of the pattern areas, at least one of values associated with an image density is detected which include a surface potential of the pattern area before development, toner density of the pattern area after development, a surface potential of the pattern area after development and an image density of an area of a transferred image which corresponds to the pattern area. The value associated with an image density is compared with a predetermined value and matched with specific one of the pattern areas. |
