Patent ID: 9164456
Filing Date: 2015-10-20
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image forming unit that forms a patch image on a recording material, the patch image including patches of a plurality of gradations; a fixing unit that fixes the patch image formed by the image forming unit; a measurement unit that irradiates light onto the patch image fixed by the fixing unit, and measures reflected light from the patch image; a reference plate provided to oppose to the measurement unit; and a control unit that controls a density or a chromaticity of an image based on a result obtained by measuring the patch image and a result obtained by measuring the reference plate by the measurement unit, wherein the control unit corrects information for controlling a density or a chromaticity of an image based on a result obtained by measuring a patch of a predetermined lightness and a result obtained by measuring the reference plate by the measurement unit, and wherein the control unit performs a first measurement of the reference plate by the measurement unit before a recording material reaches the measurement unit, and performs a second measurement of the reference plate by the measurement unit after the recording material passes through the measurement unit.