Back to results
US 10,289,046 B2Granted
Image forming apparatus with periodic non-uniformity correction and computer-readable recording medium storing program
AssigneeKonica Minolta, Inc.
InventorsMakoto Ikeda, Shunichi Takaya
Life of this patent
Estimating the term…
Abstract
With reference to a correction value revision parameter table, a periodic non-uniformity correction value corresponding to changed rotational speed is obtained from the correction value revision parameter table, and set as a new periodic non-uniformity correction value corresponding to the rotational speed of a rotary component, and thereby a gradation which is an image formation parameter of image data is corrected.
Claims6
An image forming apparatus, comprising:
- a density measuring portion configured to measure a periodic density non-uniformity of an image caused in a sub-scan direction perpendicular to a main scan direction;
- a reference position detecting portion configured to detect a reference position of a rotary component which is a correction target;
- a periodic non-uniformity correction value setting portion configured to set a periodic non-uniformity correction value based on a measurement result of the density measuring portion and a detection result of the reference position detecting portion;
- a correction portion configured to correct an image formation parameter using the periodic non-uniform correction value, wherein;
- image formation is performed using the image formation parameter corrected by the correction portion, and;
- a periodic non-uniformity correction value revising portion configured to revise the periodic non-uniformity correction value when speed of the rotary component is changed, according to the changed speed, wherein;
- the image formation is performed using the image formation parameter which is determined by a periodic non-uniformity correction value after revision in the periodic non-uniformity correction value revising portion,
- wherein the rotary component is a development sleeve, and wherein;
- the periodic non-uniformity correction value revising portion revises the periodic non-uniformity correction value originating in the development sleeve, according to change of a rotational speed ratio of the development sleeve with respect to process linear speed.
6 more elements
A non-transitory computer-readable recording medium storing a computer program of a computer provided for an image forming apparatus:
- the image forming apparatus comprising;
- a density measuring portion configured to measure a periodic density non-uniformity of an image caused in a sub-scan direction perpendicular to a main scan direction;
- a reference position detecting portion configured to detect a reference position of a rotary component which is a correction target;
- a periodic non-uniformity correction value setting portion configured to set a periodic non-uniformity correction value based on a measurement result of the density measuring portion and a detection result of the reference position detecting portion, and;
- a correction portion configured to correct an image formation parameter using the periodic non-uniform correction value, wherein;
- the computer provided for the image forming apparatus which performs image formation using the image formation parameter corrected by the correction portion, stores;
- the computer program causing the computer to execute processing comprising;
- a periodic non-uniformity correction value revision step of revising the periodic non-uniformity correction value when speed of the rotary component is changed, according to the changed speed, and;
- a step of performing image formation using the image formation parameter which is determined by a periodic non-uniformity correction value after revision in the periodic non-uniformity correction value revision step,
- wherein the rotary component is a development sleeve, and wherein:
- a computer program is further stored for executing the step of revising the periodic non-uniformity correction value originating in the development sleeve according to change in a rotational speed ratio of the development sleeve with respect to process linear speed.
8 more elements
Dependencies are inferred from the claim text.