Image forming apparatus with a controller to set transfer bias
US9864307B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2016 |
| Grant date | Jan 9, 2018 |
| Priority date | — |
| Expiry date | Mar 21, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0129
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus includes an image bearing member to bear a toner image charged with a predetermined polarity, and a power source to apply a bias to a transfer portion to transfer the toner image from the image bearing member to a recording medium, a polarity of the bias being changed alternately. The toner image formed with toner of a plurality of colors is transferred in a color mode and the toner image formed with toner of a single color is transferred in a monochrome mode. The bias includes a peak voltage with a polarity that returns toner from the recording medium to the image bearing member. An absolute value of the peak voltage in the color mode is equal to or greater than an absolute value of the peak voltage in the monochrome mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.