JP2017219758A5 - - Google Patents

Claims (10)

Image forming means for forming an image on an image carrier;
Density detection means for detecting the density of the image on the image carrier;
A reference density image of a predetermined density is formed on the image carrier, the density of the reference density image is detected, and an image used when the image forming unit forms an image based on the detection result and the target density. An image forming condition changing unit that changes the forming condition;
Gradation correction to be used when forming a multi-gradation image by the image forming means, forming a gradation pattern image on the image carrier, detecting the density of the gradation pattern image, and based on the detection result An image forming apparatus including tone correction information changing means for changing information;
When forming the gradation pattern image, the reference density image is formed on the image carrier, the density of the reference density image is detected, and the detection result is set to the target density. Forming device. In the image forming apparatus according to claim 1,
Said image forming means includes charging means for charging the surface of the latent Zo担 lifting member to a predetermined charging potential, and exposure means for exposing the charged surface of the latent image bearing member, the latent image carrier by the exposure And developing means for developing the latent image formed on the developing agent by the developer carried on the developer carrier to which a predetermined developing bias is applied.
The image forming apparatus is characterized in that the image forming conditions include at least one of a charging potential by the charging unit, an exposure amount by the exposure unit, and a developing bias applied to the developer carrier. The image forming apparatus according to claim 1 or 2
The image forming unit is formed on the image carrier by the charging unit for charging the surface of the image carrier to a predetermined charging potential, the exposure unit for exposing the charged surface of the image carrier, and the exposure. Developing means for developing the latent image with a developer containing toner and a carrier carried on a developer carrier to which a predetermined development bias is applied;
And toner density control means for controlling the toner density of the developer in the developing means.
The image forming apparatus, wherein the image forming conditions include a target value of toner density in the toner density control unit. The image forming apparatus according to any one of claims 1 to 3,
The image forming apparatus, wherein the reference density image is a maximum density image. The image forming apparatus according to any one of claims 1 to 4,
The image forming condition changing means controls the image forming means to form a plurality of the reference density images, calculates an average value of detection results of the density of each of the plurality of reference density images, and calculates the average value An image forming apparatus, wherein the image forming condition is determined based on a target density. The image forming apparatus according to any one of claims 1 to 4,
That calculates an average value of a plurality of detection results of the density of the reference density image density before Kikaicho pattern image is detected within the time that is detected, the average value is set to the target density Image forming apparatus characterized by The image forming apparatus according to any one of claims 1 to 4,
A detection result of the concentration before Symbol reference density image, and characterized by calculating an average value of the detection result of the concentration of the previous one or a plurality of the reference density image, the average value is set to the target density Image forming device. The image forming apparatus according to any one of claims 1 to 7,
The image forming condition changing means detects image forming condition correction data created in advance by correlating the amount of change in density of the reference density image with the amount of correction of the image forming condition, and detecting the density of the reference density image An image forming apparatus, wherein the image forming condition is determined based on the result. The image forming apparatus according to any one of claims 1 to 8,
Image information acquisition means for acquiring image information of an output image;
Area search means for searching an area which can be used as the reference density image or the gradation pattern image in the output image;
When there is a region which can be used as the reference density image or the gradation pattern image in the output image, the density of the region is detected as the density of the reference density image or the gradation pattern image. An image forming apparatus characterized by being used for control. The image forming apparatus according to any one of claims 1 to 9.
And calculating means for calculating a density prediction value corresponding to each gradation based on the detection result of the density of the gradation pattern image.
The image forming apparatus, wherein the gradation correction information changing unit determines the gradation correction information based on a gradation characteristic obtained from a density prediction value corresponding to each gradation calculated by the calculation unit.