Patent ID: 8660448

Claim:
An image forming apparatus, comprising: a photoreceptor; a developing device that forms a toner image by visualizing an electrostatic image formed on the photoreceptor; a developing bias supply power source; a control section that controls a developing bias supplied from the developing bias supply power source to the developing apparatus; a density sensor that detects a density of the toner image; and an arithmetic section that, for an image density adjustment operation, determines a print-time developing bias that the controlling section sets for printing, the arithmetic section determining the print-time developing bias in accordance with a detection result obtained by the density sensor by detecting a plurality of image density detection toner images that are formed by changing a developing bias, wherein: in a case where a previous print-time developing bias, which is a print-time developing bias having been set by a previous image density adjustment operation, falls within at least a low range of a predetermined range of the developing bias, the arithmetic section determines the print-time developing bias to a value between a reference developing bias for a target image density and the previous print-time developing bias.