Brush contact type charging unit in an image forming apparatus
US5012282A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1989 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | Jan 11, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0283
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A brush type charging unit having a constant-current regulated power supply for supplying a constant current to a moving photosensitive medium through a conductive brush fiber contacting the moving photosensitive medium for charging the photosensitive medium uniformly such that the charged potential varies within a range smaller than 10 V when an atmospheric condition changes from 5.degree. C.-20% RH to 35.degree. C.-80% RH. The constant-current regulated power supply has a pulse removing circuit for charging the moving photosensitive medium uniformly even when a few pin-holes exist in the photosensitive medium. A fiber element has a resistance between 4.5.times.10.sup.7 ohm and 1.times.10.sup.13 ohm when the fiber element has 1 denier in size and 1 mm in length, for charging the photosensitive medium and avoiding burning of the fiber element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.