Image forming apparatus controlling voltage applied to toner transfer units

Patent metadata

Field	Value
Publication number	US-9014584-B2
Application number	US-201213644834-A
Country	US
Kind code	B2
Filing date	Oct 4, 2012
Priority date	Oct 7, 2011
Publication date	Apr 21, 2015
Grant date	Apr 21, 2015

Abstract

An image forming apparatus includes a first image bearing member (drum); a second drum; a belt; a first transfer unit; a second transfer unit; a first voltage applying unit; a second voltage applying unit; a detecting unit, connected to the first transfer unit, for detecting a value of a current passing through the first voltage applying unit; and a controller for controlling the first voltage applying unit and the second voltage applying unit. The controller controls the first voltage applying unit during image formation on the basis of a detection result of the value of the current detected by the detecting unit at timing before and after the voltage applied to the second voltage applying unit is changed plural times before the image formation.

First claim

What is claimed is:

1. An image forming apparatus comprising:
a first image bearing member for bearing a toner image;
a second image bearing member for bearing a toner image;
a movable belt;
a first transfer unit for transferring the toner image from said first image bearing member onto said belt or a toner image receiving material conveyed by said belt;
a second transfer unit for transferring the toner image from said second image bearing member onto said belt or the tone…

Assignees

• Canon Kk

Inventors

• Murata Naofumi
• Suzuki Masahiro

Classifications

• G03G15/1675

  Physics · mapped topic

• G03G15/1605 Primary

  Physics · mapped topic