Shading correction method for a sensor, and color image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorToshiki Nakayama
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Abstract
Disclosed are a shading correction method for a sensor capable of accurately detecting color tint of a toner patch without using any white-color reference to execute shading correction in the sensor, a shading correction apparatus for a sensor, and a color image forming apparatus. In the shading correction, light reflected by a rich K toner patch formed on a transferring material is detected, a shading correction value for the sensor is calculated based on detected data, and correction is executed using the shading correction value during operation for detecting a toner patch for color stabilization.
Claims9
A color image forming apparatus comprising:
- a sensor adapted to detect chromaticity of a patch to be formed on a transferring medium;
- a correcting unit that performs shading correction of an output from said sensor;
- an adjusting unit that adjusts the color image forming conditions based on a corrected output from said correcting unit when said sensor detects a patch for adjustment of color image forming conditions to be formed on a transferring medium;
- and
- a calculating unit that calculates a shading correction value of said correcting unit based on a detected value when said sensor detects a patch for calculation of the shading correction value.
A shading correction method for a sensor for detecting chromaticity of a patch to be formed on a transferring medium by a color image forming apparatus, said shading correction method comprising:
- a first detecting step of detecting, by the sensor, a patch for calculation of a shading correction value to be formed on a transferring medium by the color image forming apparatus;
- a calculating step of calculating the shading correction value of a correcting unit based on a detected output obtained in said first detecting step;
- a second detecting step of detecting, by the sensor, a patch for adjustment of color image forming conditions;
- a correcting step of correcting an output of the sensor obtained in said second detecting step based on the shading correction value;
- and
- an adjusting step of adjusting the color image forming conditions based on a corrected output obtained in said correcting step.
Dependencies are inferred from the claim text.