| 摘要 |
PROBLEM TO BE SOLVED: To form a test patch without lowering density and causing density irregularity by an image forming device. SOLUTION: This image forming device is provided with a test patch forming means 110 producing the image data of the test patch, an image carrier on which the latent image of the test patch is formed based on the image data produced by the forming means 110, a developing means supplying toner to the latent image by using a developing roller, developing the latent image and making it into a toner image, a concentration sensor 25 detecting the toner concentration of the developed toner image of the test patch and a concentration correction means 41 correcting the concentration based on the output value of the sensor 25. Then, the test patch is formed by the forming means 40 after the toner as much as one round of the roller 1 is consumed. |
