Patent ID: 9213293
Filing Date: 2015-12-15
Classification: G01J,G03G,H04N

Abstract:
1. An image forming apparatus comprising: an image forming unit configured to form a measurement image on a sheet; a measurement unit configured to irradiate the measurement image with light and measure light reflected from the measurement image; a white reference plate arranged to be movable to a first position opposed to the measurement unit and a second position being far away from the measurement unit than the first position; a shielding unit arranged to be movable to a third position where the shielding unit blocks the light with which the measurement unit irradiates the white reference plate and a fourth position where the shielding unit does not block the light; a conveyance unit arranged to be movable to a fifth position opposed to the measurement unit and a sixth position being farther away from the measurement unit than the fifth position, and convey the sheet; and a control unit configured to control positions of the white reference plate and the shielding unit and the conveyance unit, wherein, in a case where the measurement unit measures the white reference plate, the shielding unit is at the fourth position, the white reference plate is at the first position, and the conveyance unit is at the sixth position, wherein, in a case where the measurement unit measures the measurement image, the white reference plate is at the second position, the shielding unit is at the third position, and the conveyance unit is at the fifth position, wherein, in a print operation, the shielding unit is at the third position, the white reference plate is at the second position, and the conveyance unit is at a seventh position between the fifth and sixth positions, wherein the print operation is performed without a measurement of the white reference plate performed by the measurement unit, and wherein the print operation is performed without a measurement of the measurement image performed by the measurement unit.