| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming device that has both an inductance detection ATR system and a video count ATR system and is capable of switching toner concentration control in more detail and retaining appropriate toner concentration. SOLUTION: Developer concentration control is switched from inductance detection ATR to video count ATR or from video count ATR to inductance detection ATR, according to a difference between a detection signal value obtained by inductance detection ATR and a detection signal value, or a reference value, obtained by toner replenishment control. |
