IMAGE FORMING APPARATUS

摘要

An image forming apparatus includes: an image forming unit including a rotating member; a rotation position detecting unit that detects a rotation position of the rotating member; an image density detecting unit that detects density of an image; an image information analysis unit that analyzes image information; a density profile management unit that manages a density profile; a correction data generation unit that generates correction data; a density correction unit that performs density correction; and a density correction control unit that sets a density correction level, wherein when the density correction level is set at reference accuracy, the density correction unit corrects density, and when the density correction level is set at accuracy higher than the reference accuracy, the density profile management unit forms a corrective patch image and generates a new density profile, the correction data generation unit updates the correction data, and the density correction unit corrects density.

主权项

1. An image forming apparatus comprising:
an image forming unit that includes a rotating member as a constituent, and forms an image on a sheet based on print job data; a rotation position detecting unit that detects a rotation position of the rotating member; an image density detecting unit that detects density of an image formed on an image holding member by the image forming unit; an image information analysis unit that analyzes image information included in the print job data; a density profile management unit that manages a density profile indicating density variations in a subscanning direction in such a way that a phase of the density profile corresponds to a rotation position of the rotating member; a correction data generation unit that generates correction data corresponding to a rotation position of the rotating member based on the density profile; a density correction unit that performs density correction with the correction data; and a density correction control unit that sets a density correction level based on image information of an image to be formed, wherein when the density correction level is set at reference accuracy, the density correction unit performs density correction using existing correction data, and when the density correction level is set at accuracy higher than the reference accuracy, the density profile management unit forms, on the image holding member, a corrective patch image longer than a period length of the rotating member, and generates a new density profile based on a detection result of the image density detecting unit regarding the corrective patch image, the correction data generation unit updates the correction data based on the new density profile, and the density correction unit performs density correction using the updated correction data.