Kazuhiro Okubo

8472823, Jun 25, 2013

Jan 29, 2010

12/696283

Kazuhiro Okubo - Meridian ID, US
Masahiro Yoshida - Tokyo, JP
Kazunori Hashimoto - Numazu, JP
Masahiro Shibata - Numazu, JP
Hisashi Yamauchi - Numazu, JP

Canon Kabushiki Kaisha - Tokyo

G03G 15/08
G03G 15/00

399 53, 399 43, 399257

An image forming apparatus includes first and second developer carrying members and a control device. The apparatus is operable in a first mode where an image of a single color is formed using the first developer carrying member and is operable in a second mode, wherein an image of a plurality of colors is formed using the first and second developer carrying members. The control device controls a first discharging operation for discharging developer from the first developer carrying member and a second discharging operation for discharging developer from each of the first and second developer carrying members. When the apparatus executes only the first mode, the control device performs more image formations, in a period between completion of the second discharging operation and start of the first discharging operation, compared to a period between completion of the first discharging operation and start of a subsequent first discharging operation.

20100303486, Dec 2, 2010

Jun 1, 2010

12/791412

Masahiro Shibata - Numazu-shi, JP
Masahiro Yoshida - Tokyo, JP
Kazunori Hashimoto - Numazu-shi, JP
Kazuhiro Okubo - Meridian ID, US
Hisashi Yamauchi - Numazu-shi, JP

CANON KABUSHIKI KAISHA - Tokyo

G03G 15/08
G03G 15/00

399 43, 399 55, 399 44

An image forming apparatus includes a toner carrying member for supplying toner to the image bearing member to visualize the latent image; a rotatable toner supply member, contacted to the toner carrying member, for supplying the toner to the toner carrying member, the toner supply member including a surface foam layer; a voltage applying device for applying voltages to the toner carrying member and the toner supply member; a controller for controlling the voltage application apparatus such that A and B have a polarity which is the same as a regular charging polarity of the toner, where A=Vs−Vd; B=(Vs−Vd)−(Vs−Vd); Vd is a voltage applied to the toner carrying member during a period in which the latent image is visualized; Vs is a voltage applied to the toner supplying member during the period; vd is a voltage applied to the toner carrying member during at least a part of a period which is after the visualization of the latent image and before stoppage of rotation of the toner supplying member; and Vs is a voltage applied to the toner supplying member during the at least the part of the period.