| 摘要 |
PURPOSE:To enable the quality of copy images to be adjusted rapidly at the initial state by detecting the image densities in the process of obtaining a copy picture by copying a reference original and copying this copy image, and resetting developing characteristics with this detection signal. CONSTITUTION:A grey scale 2 obtained by copying a reference original and a comparing reference grey scale 3 are placed on a contact glass 1 and copying process is done, whereby the electrostatic latent images 2a, 3a of both 2, 3 are formed on a photoreceptor 4. By respectively detecting the potentials of the electrostatic latent images 2a, 3a with potential detecting circuits 7, 8 using detectors 5, 6, the optical densities of both 2, 3 are detected as potentils and these are compared in a comparator 9, thence the correction quantity of the toner concentration is operated in an arithmetic circuit 10 and is displayed in a correction quantity display device 12 through a correction quantity indicating circuit 11. If a toner density setting dial 13 is corrected by this correction quantity, the toner concentration may be corrected to the original value. |
