Patent ID: 7880922

Claim:
An image forming apparatus comprising: a first toner image forming section that forms a visible toner image; a second toner image forming section that forms an invisible toner image, a resolution of the invisible toner image is lower than a resolution of the visible toner image; and a transfer section that transfers to a medium the visible toner image and the invisible toner image; wherein the resolution of the visible toner image in a main scanning direction is higher than the resolution of the invisible toner image in the main scanning direction, wherein the first toner image forming section and the second toner image forming section include a first scanning section and a second scanning section scanning a laser light on a photoreceptor, respectively, and the first scanning section and the second scanning section are configured to satisfy the following relation: Fv/Vv>Fi/Vi where Fv and Fi are a laser light modulation frequency in the first scanning section and the second scanning section, respectively, and Vv and Vi are a scanning speed of the first scanning section and the second scanning section, respectively.