| 摘要 |
<P>PROBLEM TO BE SOLVED: To maintain an appropriate image density even if the abrasions change on a photoreceptor drum by setting up an appropriate applied charging voltage matching the abraded photoreceptor drum. <P>SOLUTION: When forming images by using a photoreceptor drum following the operation conditions matching the image forming mode selected from various candidates, the total number of the actually printed sheets Pi is corrected and recorded based on the image forming mode (monochrome mode, or color mode, low-temperature low-humidity environmental mode, or other environmental modes) selected when forming images (S7). Then, the correction value (ko×Pia) is calculated to set up the static charging voltage Ey based on the total number Pia of sheets to print after the above correction (S4). Thus, the voltage Ey is changed to apply to the charging device following the total number of printing at a pace controlled, based on the image forming mode. <P>COPYRIGHT: (C)2007,JPO&INPIT |
