Image forming apparatus capable of predicting the level of occurrence of a transfer memory and the cause of occurrence thereof
US11067923B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 2020 |
| Grant date | Jul 20, 2021 |
| Priority date | — |
| Expiry date | Aug 4, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/55
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus includes an image forming portion, a high-voltage generation circuit, a current detection portion and a control portion. The image forming portion includes an image carrying member, a charging device, an exposure device and a developing device which includes a developer carrying member for carrying a two-component developer. The control portion can perform a transfer memory prediction mode that includes a step of estimating, when a first reference image is formed, the level of occurrence of transfer memory based on the direct-current component of a development current flowing through the developer carrying member and a step of measuring, when the measured direct-current component of the development current is larger than a predetermined value, the amount of charge of the toner within the developing device and estimating the cause of occurrence of the transfer memory based on the measured amount of charge of the toner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.