| 摘要 |
An image forming device and method improves image quality by detecting the density of a pattern and adjusting the voltage applied to a developer supply member if necessary in response to the detected density. The pattern can be a medium duty tone pattern, which is relatively sensitive to environmental changes that can affect image density. The density detection pattern can be produced and detected after every predetermined number of sheets are printed, to maintain an acceptable image density during large print jobs. The pattern is formed on the surface of a transferring unit, which transfers the sheets. |
