公开(公告)号：US20170199480A1

公开(公告)日：2017-07-13

申请号：US15296542

申请日：2016-10-18

申请人： Mutsuki MORINAGA ,  Tadashi KASAI ,  Jun HITOSUGI ,  Takamasa OZEKI ,  Makoto YASUDA ,  Kunio HASEGAWA ,  Emiko SHIRAISHI ,  Hitoshi YAMAMOTO ,  Masahiko SHAKUTO ,  Tetsuya MUTO ,  Keiko KAJIMURA ,  Tomoya OHSUGI

发明人： Mutsuki MORINAGA ,  Tadashi KASAI ,  Jun HITOSUGI ,  Takamasa OZEKI ,  Makoto YASUDA ,  Kunio HASEGAWA ,  Emiko SHIRAISHI ,  Hitoshi YAMAMOTO ,  Masahiko SHAKUTO ,  Tetsuya MUTO ,  Keiko KAJIMURA ,  Tomoya OHSUGI

IPC分类号： G03G15/08

CPC分类号： G03G15/0131 ,  G03G15/0189 ,  G03G15/0849 ,  G03G15/5058 ,  G03G15/55 ,  G03G15/556 ,  G03G2215/00059 ,  G03G2215/0164

摘要： An image forming apparatus includes a toner pattern bearer to bear a first toner pattern having a first image area rate and a second toner pattern having a second image area rate different from the first image area rate. A toner adhesion amount detector detects a toner adhesion amount of toner of each of the first toner pattern and the second toner pattern. A toner degradation rate calculator calculates a first deviation in the toner adhesion amount of the first toner pattern and a second deviation in the toner adhesion amount of the second toner pattern based on the toner adhesion amount detected by the toner adhesion amount detector. The toner degradation rate calculator compares the first deviation with the second deviation and calculates a toner degradation rate based on a comparison result.