Image forming apparatus using trapezoidal shaped electric field and method for forming image
US7689150B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2007 |
| Grant date | Mar 30, 2010 |
| Priority date | — |
| Expiry date | Apr 29, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0813
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An object of the present invention is to provide an image forming apparatus and a method for forming an image that are capable of controlling the consumption of opposite polarity particles and suppressing the reduction of toner charge amount due to the carrier deterioration and can form high quality images over a long period of time even in the case where large quantities of images with small image area ratio are printed. The image forming device includes a developer further including the opposite polarity particles, a developer carrying member, a toner carrying member, and a voltage applying section for applying bias voltage overlapped with alternating current between the toner carrying member and the image carrying member, wherein the bias voltage overlapped with alternating current is a vibrating waveform including a trapezoidal wave, or a vibrating waveform in which a blank is inserted during application of a reverse development side voltage component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.