Method and apparatus for forming two toner images in a single frame
US5985499A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 1993 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | May 20, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0497
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A composite toner image made up of first and second toners is formed on an image member. A first electrostatic image of a first polarity is formed on the image member. That electrostatic image is toned with a first toner of the first polarity. The image member is imagewise exposed to create a second electrostatic image also of the first polarity. Exposure is overlapped into the portion of the image member under the first toner image to prevent any charge on the photoconductor of the first polarity underneath the first toner image from repelling toner into the portions of the second electrostatic image that are discharged. Preferably, the second exposure is accomplished through the base of the image member in order to thoroughly expose portions of the electrostatic image underneath the first toner image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.