Patent ID: 9696673
Date: 2017-07-04
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: a first image forming unit having a first photoreceptor and a first laser scanner including a first light source which emits a first laser light and a first rotating polygon mirror which reflects the first laser light such that the first laser light scans the first photoreceptor and, the first image forming unit is configured to form a first toner image, using a first toner, by developing an electrostatic latent image formed on the first photoreceptor by scanning the first laser light; a second image forming unit having a second photoreceptor and a second laser scanner including a second light source which emits a second laser light and a second rotating polygon mirror which reflects the second laser light such that the second laser light scans the second photoreceptor, the second image forming unit is configured to form a second toner image, using a second toner having a color which is different from a color of the first toner, by developing an electrostatic latent image formed on the second photoreceptor by scanning the second laser light; an intermediate transfer member to which the first toner image formed on the first photoreceptor and the second toner image formed on the second photoreceptor are transferred; a transfer unit configured to transfer the first toner image and the second toner image transferred to the intermediate transfer member to a recording medium; a conveyance unit configured to convey the recording medium to a transfer position at which toner images on the intermediate transfer member are transferred to the recording medium by the transfer unit; a first optical sensor configured to detect the first toner image and the second toner image transferred to the intermediate transfer member; a second optical sensor arranged at a position different from where the first optical sensor is arranged in a direction which crosses a direction in which the surface of the intermediate transfer member moves and configured to detect the first toner image and the second toner image formed on the intermediate transfer member; a storing unit configured to store data relating to the amount of skew of the recording medium to be conveyed to the transfer position by the conveyance unit in a conveying direction of the recording medium at the transfer position; and a control unit configured to control the first image forming unit and the second image forming unit,