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公开(公告)号：US20190171127A1
公开(公告)日：2019-06-06
申请号：US16321225
申请日：2018-06-08
发明人： Seiji TAKI
IPC分类号： G03G15/043 , G03G15/04 , H04N1/00 , H04N1/113
CPC分类号： G03G15/043 , G03G15/04072 , G03G15/5062 , G03G15/55 , H04N1/00087 , H04N1/1135
摘要： Provided is an image forming apparatus configured to acquire a density of a test print image at each position in the main scanning direction, which is read by the image reading unit after a first test print image is formed, to correct a setting value of an exposure amount of an exposure device to a first light amount, which is higher than a reference light amount that is an exposure amount when the first test print image is formed, in an area where the acquired density is lower than a target density, to correct the exposure amount of the exposure device to a second light amount, which is lower than the reference light amount, in an area where the acquired density is higher than the target density, and to form a second test print image. On the basis of the second test print image, density correction is performed.
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公开(公告)号：US20190204771A1
公开(公告)日：2019-07-04
申请号：US16328749
申请日：2018-05-25
发明人： Seiji TAKI
IPC分类号： G03G15/00
摘要： A density correction unit calculates a density change rate to a change in an exposure amount as a first density change rate based on a difference between a density of a part of reference patch images, in which a position in a main scanning direction is identical to a position of a first patch image. As for a second patch image, the density correction unit similarly calculates a second density change rate. A light amount when forming the first patch image is smaller than a reference light amount. A light amount when forming the second patch image is larger than the reference light amount. The density correction unit uses the first or the second density change rate based on whether a density of each position of the reference patch images in the main scanning direction higher or lower than a target density to correct the exposure amount
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