| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an image formation device capable of forming a halftone toner image having a more stable image density for a long term while suppressing increase in down time of the device.SOLUTION: In halftone condition update processing, a plurality of halftone toner images having different gradation to each other are prepared and based on detection results of each image density a gradation correction table is corrected so as to be able to obtain a desired image density for each halftone toner image. In a configuration where a controller is made to perform the halftone condition update processing, control means is configured such that a toner image having a predetermined gradation is prepared and based on the detection results of the image density, halftone condition correction processing for correcting each of the plurality of halftone imaging conditions is performed independent of the halftone condition update processing.</p> |
