Developing bias power unit for use in an image forming apparatus
US5262828A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1992 |
| Grant date | Nov 16, 1993 |
| Priority date | — |
| Expiry date | Dec 9, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/065
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus accommodates a developing bias power unit for applying a bias voltage to a developing sleeve confronting a photosensitive member. The developing bias power unit includes a DC power source, an electricity storage element interposed between the DC power source and the developing sleeve, and a controller for on-off controlling the DC power source. When an output of the DC power source is activated, the electricity storage element is electrically charged by an output voltage of the DC power source, and a first voltage is applied to the developing sleeve. In contrast, when the output of the DC power source is deactivated, a second voltage of reverse polarity is applied to the developing sleeve by electric charge held in the electricity storage element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.