Image forming apparatus, control method therefor, and program for implementing the control method
US7196717B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2005 |
| Grant date | Mar 27, 2007 |
| Priority date | — |
| Expiry date | Oct 28, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/5037
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus which is capable of eliminating density irregularities of an image formed caused by potential irregularities of the photosensitive member when the drum is irradiated by a beam of constant luminous intensity. A laser driver irradiates a beam modulated based on an image signal onto a photosensitive member. A current controller variably controls a driving current for driving the laser driver. A PWM pulse width converter modulates a pulse width of the beam based on the image signal. A potential sensor measures the potential of the photosensitive member after the photosensitive member is irradiated by a beam having a predetermined luminous intensity. A selector causes the current controller to correct the driving current based on low frequency components of irregularities of the potential and changes a modulation coefficient used for modulating the pulse width based on high frequency components of the irregularities of the potential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.