Electrostatic printer support with controlled electrostatic surface voltage
US4068585A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 29, 1975 |
| Grant date | Jan 17, 1978 |
| Priority date | — |
| Expiry date | Aug 29, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S101/37
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A line printing apparatus in which spot patterns of ink or toner particles are formed on a moving paper sheet. A modulator defined by a corona source and an electric shield which has a multiplicity of linearly arranged apertures is spaced from one side of the paper. The voltage at each aperture is individually controlled so that ions from the corona are permitted or prevented from passing through preselected apertures. The passing ions impinge certain particles in a toner particle cloud between the modulator and the one side of the paper sheet. A paper support bar is positioned on the other side of the paper and constructed of an insulator and an elongate electrode is secured to the back side of the insulator and positioned parallel to the aperture array. Lateral sides of the insulator are grounded and a high voltage applied to the electrode results in a high surface voltage on the paper support surface of the insulator which gradually drops off to zero or opposite potential from a maximum along a line aligned with the aperture array to the lateral sides of the insulator. Those toner particles impinged by ions are attracted to the high surface voltage on the insulator and deposited…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.