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US 2014/0233049 A1Published application
Test chart used for calibration in image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorTaichi Takemura
Life of this patent
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Abstract
Multiple measurement images are formed in a test chart. Reflected light from the test patterns is received by light receiving elements of a color sensor for an accumulation time that is determined for the respective test patterns. The lengths of the test patterns in the conveyance direction of the test chart are determined according to the lengths of the accumulation times for the respective test patterns.
Claims15
An image forming apparatus comprising:
- an image forming unit configured to create a test chart including a plurality of measurement images by forming a plurality of measurement images on a sheet;
- a conveying unit configured to convey the test chart;
- and
- a measuring unit configured to measure the plurality of measurement images that are formed on the test chart conveyed by the conveying unit,
- wherein the measuring unit comprises a light receiving element for receiving reflected light from the plurality of measurement images for accumulation times of the reflected light that are defined for the respective measurement images, and
- the image forming unit is further configured to form the measurement images of which lengths in the conveyance direction of the test chart correspond to the defined accumulation times for the respective measurement images.
3 more elements
A test chart for calibration of an image forming apparatus, the test chart comprising:
- a plurality of measurement images formed on a sheet,
- wherein the measurement images are arranged so that the lengths of the measurement images in the conveyance direction of the test chart are proportional to accumulation times defined for said respective measurement images, and wherein the defined accumulation times are accumulation times of a light receiving element of an image forming apparatus for accumulating reflected light from the plurality of measurement images of the test chart.
Dependencies are inferred from the claim text.