Color image forming apparatus and color image forming method having overlapping toners
AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
InventorsYoshiaki Okano, Masatsugu Hirayama
Life of this patent
Estimating the term…
Abstract
In a digital copying machine according to an image forming apparatus of the invention, when a “thick paper” mode is set through an operation panel, a main CPU sets a gradient of γ for “thick paper” in a γ correction unit of an image processing unit. Thus, a toner attachment amount is controlled and changed from 1.6 mg/cm2 to 1.0 mg/cm2, thereby widening a fixation temperature range for good fixation.
Claims7
An image forming apparatus that forms a color image by overlapping toners of a plurality of colors, on the basis of a plurality of image data corresponding to the plurality of colors, the apparatus comprising:
- setting means for setting a thick paper mode in which an image is to be formed on thick paper, in contrast to an ordinary paper mode in which an image is to be formed on ordinary paper, on the basis of the plurality of image data corresponding to the plurality of colors;
- and
- γ correction means for subjecting the plurality of image data to γ correction based on a γ correction value;
- image forming means for forming an image based on the image data subjected to the γ correction;
- and
- control means for executing a control to change a γ correction value for the ordinary paper mode to a γ correction value for the thick paper mode, to thereby reduce a maximum toner attachment amount of each of the toners of the plurality of toners, and set the same fixation temperature condition as in the ordinary paper mode.
Dependencies are inferred from the claim text.