Image forming apparatus for setting an electrification voltage
US9261847B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2015 |
| Grant date | Feb 16, 2016 |
| Priority date | — |
| Expiry date | Feb 11, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0283
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus includes photoconductors. Electrifiers uniformly electrify surfaces of the photoconductors. A power source applies an electrifying voltage to the electrifiers. A current measurer measures alternating current caused to flow by application of AC voltage by the power source. A controller calculates discharge starting voltage. Environment detectors detect an environment inside of the apparatus. The controller operates the current measurer at each predetermined timing to acquire the discharge starting voltage. When acquiring the discharge starting voltage, the controller changes peak-to-peak voltage at pre-discharge voltage and at post-discharge voltage. The current measurer measures alternating current at measurement points of each of the pre-discharge and post-discharge voltages. The controller calculates a voltage value at an intersection of a first line and a second line. After acquiring the discharge starting voltage, the controller calculates environment-correction discharge starting voltage, and sets electrification voltage based on the calculated voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.