Image forming apparatus
US7557960B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2005 |
| Grant date | Jul 7, 2009 |
| Priority date | — |
| Expiry date | Aug 25, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4015
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Uneven image density produced by photoreceptors, in which uneven electrification and sensitivity coexist, is limited economically and space efficiently. For each segment of the surface of the photoreceptor, individual memorizing of slope information K1 defining the slope of when a pixel gradation is approximately linear-transformed into exposure amount and, based upon K1 per segment, individual transforming of pixel gradation into the exposure amount (individual exposure amount transformation) is performed. The slope information which, with a reference electric potential Vs1 , matches the electric potential after the exposure of when the exposure amount, obtained by transforming a reference pixel gradation Is1 by means of the individual exposure amount transformation, is applied to the approximately-linear exposure property excepting the converging region to a residual potential VL, or to the exposure property extended by extrapolation operation, among exposure property g01 showing correspondence between the exposure amount and the electric potential after exposure per segment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.