Image forming apparatus configured to reduce the number of sheets to be output for gradation correction while maintaining gradation stability
US8553300B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 4, 2011 |
| Grant date | Oct 8, 2013 |
| Priority date | — |
| Expiry date | Feb 2, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6033
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image forming apparatus includes: an image forming section; a first density sensor; a second density sensor; and a control section to control the image forming section to form a first gradation pattern image including patches having different densities on the image carrier, to execute gradation correction of the image forming section based on a detection result obtained with the first density sensor, to control the image forming section to print a second gradation pattern image including patches having different densities on the sheet, and to execute the gradation correction based on a detection result obtained with the second density sensor, and wherein the control section adds a gradation correction result by the first density sensor to a gradation correction result by the second density sensor according to a predetermined ratio, and executes the gradation correction based on an addition result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.