Image forming apparatus and image forming method for controlling a secondary transfer bias according to recording sheet type
US10185255B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2017 |
| Grant date | Jan 22, 2019 |
| Priority date | — |
| Expiry date | Feb 14, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G5/147
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus includes an image bearer to bear a toner image, a nip forming member contacting the image bearer to form a transfer nip, and a transfer power source. The transfer bias has a transfer peak value to electrostatically move toner from the image bearer to the recording sheet and an opposite-peak value to electrostatically move less toner from the image bearer to the recording sheet than the transfer peak value. An opposite-peak duty of the transfer bias is less than 50%. The opposite-peak duty is tr/T×100% where T is one cycle of the transfer bias and tr is a time period during which the transfer bias is on a side of the opposite-peak value relative to an offset voltage of the transfer bias in the one cycle T.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.