Printing apparatus
US6049690A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1998 |
| Grant date | Apr 11, 2000 |
| Priority date | — |
| Expiry date | Mar 12, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0141
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A drum phase correction unit for detecting rotational positions of a plurality of photosensitive drums by means of a plurality of drum position sensors and corrects to set rotational phases of the drums to predetermined phases in such a manner that transfer positions on drum circumferential surfaces relative to a belt when employing the thus detected rotational positions as their respective references have a specific relationship including coincidence. A positional offset detection unit detects positional offsets of transfer image on recording paper attributable to the wow and flutter in a drive system including the belt and the photosensitive drums. On the basis of the thus detected positional offsets, a wow and flutter correction unit corrects the positional offsets of the transfer images on the recording paper attributable to the wow and flutter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.