Electrophotographic apparatus and method for preventing the lowering of a charging voltage at a photoreceptor
US4785324A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1987 |
| Grant date | Nov 15, 1988 |
| Priority date | — |
| Expiry date | Mar 13, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G21/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photoreceptor of amorphous silicon is provided on the surface of a cylindrical drum. A charger, exposing unit, developing unit, transfer charger, separation charger, discharger and cleaning blade are located, in that order, around the cylindrical drum. A light shielding plate is located close to that surface of the discharger where the first-mentioned charger is positioned. The surface of the photoreceptor is charged, while the cylindrical drum is rotated, and then exposed to light to form an electrostatic latent image on that surface. A toner is supplied from the developing unit to the surface of the photoreceptor to develop the latent image into a visual image. The visual image is transferred by the transfer charger to a copying sheet, and the copying sheet is separated by the separation charger off the photoreceptor. Thereafter, the image transfer area of the photoreceptor is discharged by light from a discharging lamp in the discharger and the toner remaining on the surface of the phtotreceptor is removed by a cleaning blade.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.