| CPC G03G 15/5041 (2013.01) [G03G 15/5037 (2013.01); G03G 15/5058 (2013.01)] | 6 Claims |
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1. An image forming apparatus comprising:
an image carrier having a photosensitive layer formed on its outer circumference surface;
a charging unit configured to charge the outer circumference surface of the image carrier at a predetermined surface potential;
an exposing unit configured to expose the outer circumference surface of the image carrier charged by the charging unit, so as to form an electrostatic latent image whose charge is decreased;
a developing unit configured to supply toner to the electrostatic latent image on the image carrier so as to form a toner image;
a density detection unit configured to output a detection value of toner density of the toner image on the image carrier; and
a control unit configured to control the image carrier, the charging unit, the exposing unit, and the developing unit, wherein
the density detection unit includes a light emitting unit configured to emit light to the toner image when being applied with a predetermined voltage, and a single light receiving unit configured to receive reflection light reflected by the toner image,
the control unit is capable of performing a density correction mode, in which reference images as the toner image for density correction are formed with density gradations changed sequentially in a plurality of steps, toner densities of the formed reference images are each detected by the density detection unit, and the toner density is corrected on the basis of detection results,
on the basis of the detection values of the toner density detected in the density correction mode, the control unit detects presence or absence of a change in the voltage in each density gradation, and
if the density gradation has a specific density gradation in which a change in the voltage is detected, the control unit corrects the toner density of the specific density gradation, using the detection values of density gradations before and after the specific density gradation.
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