Patent ID: 8843006

Claim:
An image forming apparatus comprising: an image forming unit that forms an image using a developer; a carrier that carries and conveys the image formed by the image forming unit; a detecting unit that detects a first adjustment image based on a light reception result of reflection of light projected toward the carrier when the first adjustment image is formed on the carrier by the image forming unit, a length of the first adjustment image in an orthogonal direction, which is a direction orthogonal to a conveyance direction of the image, being a first orthogonal direction length; and an adjusting unit that adjusts a formation condition of an image to be formed on a sheet based on a result of the detection of the first adjustment image by the detecting unit, wherein the image forming unit forms a second adjustment image having a first mark on the carrier, a length of the first mark in the orthogonal direction being a second orthogonal direction length, wherein when the detecting unit detects the second adjustment image based on a light reception result of reflection of light projected toward the carrier, the adjusting unit adjusts a position of the first adjustment image to be formed on the carrier in the orthogonal direction by using the second orthogonal direction length, wherein the second orthogonal direction length of the first mark is smaller than the first orthogonal direction length of the first adjustment image, wherein the first mark is formed at a position on the carrier that is different from a position of the first adjustment image in the conveyance direction, and wherein a first length, which is a length between an intersection of the first mark and a virtual first straight line that extends in the conveyance direction from a first end portion of the first adjustment image in the orthogonal direction and a first end portion of the first mark, which is closer to a virtual second straight line that extends in the conveyance direction from a second end portion of the first adjustment image in the orthogonal direction than a second end portion of the first mark, is smaller than a length obtained by subtracting the second orthogonal direction length from the first orthogonal direction length.