Patent ID: 8843038
Filing Date: 2014-09-23
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a first detection unit that receives first reflected light reflected from a first region irradiated with first irradiation light and that detects a signal indicating the amount of the first reflected light; at least one second detection unit that receives second reflected light reflected from a second region irradiated with second irradiation light having an irradiation range smaller than an irradiation range of the first irradiation light, and that detects a signal indicating the amount of the second reflected light; a first image forming unit that forms a plurality of first images having a predetermined length in a predetermined direction, in a first portion of a medium moving in the predetermined direction, the first portion passing through the first region, the plurality of first images being configured in such a manner as to be spaced apart from each other at predetermined first intervals in the predetermined direction; a second image forming unit that forms a plurality of second images having a length in the predetermined direction which is shorter than the length of the plurality of first images, in a second portion of the medium, the second portion passing through the second region, the plurality of second images being configured in such a manner as to be spaced apart from each other at second intervals shorter than the first intervals in the predetermined direction; a third image forming unit that forms a third image used to specify density deviation amounts by using a predetermined density as a reference, in the first portion; a first specifying unit that specifies a misregistration amount of the plurality of first images formed in the first portion, on the basis of the signal detected by the first detection unit when the plurality of first images pass through the first region; a second specifying unit that specifies a misregistration amount of the plurality of second images formed on the second portion, on the basis of the signal detected by the at least one second detection unit when the plurality of second images pass through the second region; and a third specifying unit that specifies the density deviation amounts on the basis of the signal detected by the first detection unit when the third image passes through the first region.