Semi-contact bias charge roller
US8897675B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2013 |
| Grant date | Nov 25, 2014 |
| Priority date | — |
| Expiry date | May 23, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0266
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
There is described an image forming apparatus including an imaging member having a charge retentive-surface for developing an electrostatic latent image thereon, a substrate and a photoconductive member disposed on the substrate. A bias charge roller for applying an electrostatic charge on the charge retentive surface to a predetermined electric potential is included in the image forming apparatus. The bias charge roller includes a first circumferential area in contact with the photoconductive member (CC[contact]), and a second circumferential area (CC[non-contact]) spaced a distance of from 1 μm to 1 mm from the photoconductive member. The image forming apparatus includes a power supply for supplying an oscillating voltage signal to the bias charge roller wherein the oscillating voltage signal has a frequency Am[fAC] and an amplitude Am[VAC]. The following relationship is met: (CC[contact]/CC[non-contact])≦(Am[fAC]/Am[VAC])≦(CC[non-contact]/CC[contact]) by the image forming apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.