Image forming apparatus performing image concentration stabilization control

摘要

An image forming apparatus includes an image carrier that carries a toner image, an image forming device that forms the toner image on the image carrier, a sensing device that senses a toner concentration of the image carrier and a control device that makes the image forming device form a test toner image on the image carrier, and determines necessity to execute each adjustment operation for adjusting a plurality of kinds of driving conditions for the image forming device at the time of forming the toner images, based upon a toner concentration of the test toner image.

主权项

1. An image forming apparatus, comprising:
an image carrier that carries a toner image; an image forming device that forms the toner image with a plurality of colors on the image carrier; a sensing device that senses a toner concentration of the toner image carried by the image carrier; a control device that makes the image forming device form a test toner image on the image carrier, and individually determines, for each of a plurality of adjustment operations, whether to execute each adjustment operation for adjusting driving conditions for the image forming device, based upon a toner concentration of the test toner image; wherein at least one of the driving conditions is a condition concerning superimposition of the toner images with the plurality of colors; wherein the test toner image is conveyed by the image carrier in a predetermined direction, the test toner image being formed of toner images with a plurality of colors aligned in the predetermined direction and boundaries arranged between the toner images, the boundaries including portions not orthogonal to the predetermined direction; and wherein the toner images of the test toner image are arranged without any gap or overlap on the boundaries when the driving conditions do not require correction.