Image forming apparatus capable of returning scattered toner at a portion where a developing roller and a supply roller face each other to a circulation path during an image forming operation
US11480893B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2022 |
| Grant date | Oct 25, 2022 |
| Priority date | — |
| Expiry date | Jan 21, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0907
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus includes an image carrier, an exposure device to expose the image carrier to form an electrostatic latent image on the image carrier, a conductive member, and a developing device having a rotatable developing roller and a rotatable toner supply roller. Polarity of direct-current components of biases applied during an image forming operation to the conductive member, the developing roller, and the toner supply roller are the same as a polarity of normally charged toner. An absolute value of the bias applied to the developing roller during the image forming operation is smaller than an absolute value of the bias applied to the toner supply roller during the image forming operation. The absolute value of the bias applied to the toner supply roller during the image forming operation is smaller than an absolute value of the bias applied to the conductive member during the image forming operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.