Electrophotographic image forming apparatus comprising means for automatically adjusting image reproduction density
US5453773A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1991 |
| Grant date | Sep 26, 1995 |
| Priority date | — |
| Expiry date | Nov 27, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00037
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an electrophotographic image forming apparatus including a charger for electrically charging the photoconductor to a predetermined initial electric potential, a laser projects a light onto the photoconductor so as to form an electrostatic latent image thereon, and a developing device develops the latent image with toner so as to form a toner image thereon. Further, a charger controller controls the charger based on a detection result of a detector for detecting a state of the photoconductor so that the initial electric potential of the photoconductor changes in a predetermined range, and a selection controller selects one of the plurality of gradation correction data stored in a storage unit based on the detection result of the detector when the initial electric potential of the photoconductor is an upper or lower limit value of the predetermined range. Moreover, a light projecting controller controls the laser to change a light amount of the light projected, based on the gradation correction data selected by the selection controller, according to an image density signal for representing densities of respective pixels of an image to be formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.