Image forming apparatus
US6195524A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2000 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Jan 27, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0161
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The purpose of the present invention is to provide an image forming apparatus capable of excellent detection of the position of a toner mark on a transfer member without being influenced by transfer member thickness variation or position oscillation, and capable of high precision detection by eliminating errors due to differences in measurement timing by directly detecting the overlay dislocation of a plurality of toner layer with the same timing. The image forming apparatus of the present invention attains these goals by detecting the distance from the sensor to the transfer member 6, and the distance from the sensor to the toner mark P, and determining the position of the toner mark P via the difference in the distances. In this way the positional dislocation of the toner mark P can be detected with excellent precision.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.