Patent ID: 9411292
Filing Date: 2016-08-09
CPC Classification: G03G,H04N

Claim Text:
1. An image forming apparatus comprising: a controller including a Central Processing Unit (CPU); and a memory from which data is read by the CPU; wherein the CPU executes an image forming process including forming an image on a first recording medium based on image data; measuring a size of the first recording medium; calculating an expansion ratio of the first recording medium based on a first size of the first recording medium obtained before the first recording medium is passed through and a second size of the first recording medium obtained after the first recording medium is passed through; and correcting the image data that is used for forming another image on a second recording medium conveyed after the first recording medium based on the expansion ratio of the first recording medium, wherein the measuring includes measuring a length of the first recording medium in a sheet-conveyance direction of the first recording medium, detecting a passing of an end of the first recording medium, detecting a passing of a first end part of the first recording medium and detecting a passing of a second end part of the first recording medium on the opposite side of the first end part, wherein the calculating includes calculating the average of expansion ratios of the plurality of other recording media according to “Lram=(Lr1+Lr2+ . . . +Lrm)/m” and “Wram=(Wr1+Wr2+ . . . +Wrm)/m”, wherein “m” is the number of the plurality of other recording media, “Lr” is an expansion ratio based on a length of each of the plurality of other recording media, and “Wr” is an expansion ratio based on a width of each of the plurality of other recording media, and wherein the correcting includes correcting the image data based on the calculated average of expansion ratios of the plurality of other recording media.