Method and apparatus to improve registration in a black first printing machine
US5537190A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1994 |
| Grant date | Jul 16, 1996 |
| Priority date | — |
| Expiry date | Dec 12, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/017
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for achieving optimum optical contrast for detecting registration marks in a multicolor print black first color electrophotographic printing machine. A black mask having voids in the shape of a registration mark is formed on the photoreceptor. A high contrast color is then overwritten on the mask forming marks which indicate the position of the black image. A second method utilizes only the first recharge unit and the last developer unit. A registration mark is imaged by each imager and all of the latent image registration marks are developed with a single color high contrast toner. A sensor is then used to determine the relative position of the various color imagers and to send signals to the controller to make appropriate corrections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.