Web conditioning charging station
US6745001B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 2002 |
| Grant date | Jun 1, 2004 |
| Priority date | — |
| Expiry date | Jul 26, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/168
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method and apparatus for conditioning a moving transport web for neutralizing or modifying polar charge density and net charge density on the moving transport web included, for example, in an electrostatographic printer. The web conditioning includes a charging station which has a first stage including two open-wire AC corona chargers facing one another across the transport web, and downstream, a second stage including two gridded AC corona chargers facing one another across the transport web. The grids of the gridded AC corona chargers are preferably grounded, the AC waveforms for energizing the corona wires of the open-wire chargers and the gridded chargers are preferably quasi trapezoidal with no applied DC offsets, with preferably preselected asymmetries in the spacings from the web in the first and second stages. The first stage accomplishes at least about 80% of said neutralizing of said polar charge density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.