Patent ID: 9383675
Filing Date: 2016-07-05
CPC Classification: G03G

Claim Text:
1. An image processing device comprising: an image forming section comprising: a conveyer configured to convey a sheet in a sheet conveying direction; a bearing member configured to bear an image; and a light-emitting-element array having a plurality of light emitting elements arranged linearly in an arrangement direction that is perpendicular to the sheet conveying direction, the image forming section being configured to form an image on the bearing member by using the plurality of light emitting elements to form the image on a sheet; a reader configured to read an image formed on the sheet; a processor; and a memory storing instructions, the instructions, when executed by the processor, causing the processor to perform: a pattern writing process of controlling the image forming section to form a pattern image on the sheet, the pattern image being an image for detecting positional deviation of the light-emitting-element array; a pattern reading process of controlling the reader to read as image data the pattern image formed on the sheet by the pattern writing process; a dividing process of dividing the pattern image read in the pattern reading process into a plurality of blocks in the arrangement direction of the plurality of light emitting elements; and a deviation calculating process of calculating an amount of positional deviation of the light-emitting-element array in the sheet conveying direction, for each of the plurality of blocks, wherein the light-emitting-element array comprises a plurality of light-emitting-element arrays, wherein the processor is configured to, in the deviation calculating process, calculate the amount of positional deviation of each of the plurality of light-emitting-element arrays in the sheet conveying direction, wherein the processor is configured to, in the pattern writing process, control the image forming section to form, on a sheet, the pattern image formed by neighboring ones of the plurality of light-emitting-element arrays, at positions different from each other with respect to the sheet conveying direction, and wherein the processor is configured to, in the pattern writing process, control the image forming section to form mark images for position recognition on the sheet, the mark images being formed by using a same light emitting element as the pattern image and located at an upstream side and a downstream side of the pattern image in the sheet conveying direction so that the pattern image is interposed between the mark images.