Image forming apparatus, method of controlling the same, and storage medium
AssigneeCanon Kabushiki Kaisha
InventorAtsushi Shoji
Life of this patent
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Abstract
An image forming apparatus obtains a number of pixels to be developed on a downstream side in a sub-scanning direction from the each one of the predetermined pixels, in order to correct a density increase that occurs at the trailing edge of an image to be formed in accordance with a peripheral speed difference between a photosensitive drum and a developing roller, determines a correction amount of light amount for each one of the predetermined pixels in accordance with the obtained number of pixels, and generates image formation data.
Claims6
An image forming apparatus, comprising:
- a photosensitive drum;
- an exposure unit configured to expose the photosensitive drum to form an electrostatic latent image on a surface of the photosensitive drum;
- a developing roller configured to develop the electrostatic latent image formed on the surface of the photosensitive drum by using a developer;
- a memory device that stores a set of instructions;
- and
- at least one processor that executes the instructions to:
- for each predetermined pixel of a plurality of pixels of image data to be formed, obtain a number of pixels to be developed on a downstream side in a sub-scanning direction from the predetermined pixel,
- in order to correct a density increase that occurs at a trailing edge of an image to be formed in accordance with a peripheral speed difference between the photosensitive drum and the developing roller, determine a correction amount of light amount for each predetermined pixel of the plurality of pixels in accordance with the obtained number of pixels, and generate image formation data using the correction amount of light amount determined for each predetermined pixel,
- wherein the correction amount of light amount is determined to be a fixed correction amount of light amount at a trailing region of the image where the density increase occurs, and is determined so that it smoothly reduces from the fixed correction amount of light amount in a predetermined region width from a leading edge side of the trailing region toward the leading edge side of the image.
A method of controlling an image forming apparatus provided with a photosensitive drum, an exposure unit operable to expose the photosensitive drum to form an electrostatic latent image on a surface of the photosensitive drum, and a developing roller operable to develop the electrostatic latent image formed on the surface of the photosensitive drum by using a developer, the method comprising:
- for each predetermined pixel of a plurality of pixels of image data to be formed, obtaining a number of pixels to be developed on a downstream side in a sub-scanning direction from the predetermined pixel,
- in order to correct a density increase that occurs at a trailing edge of an image to be formed in accordance with a peripheral speed difference between the photosensitive drum and the developing roller, determining a correction amount of light amount for each predetermined pixel of the plurality of pixels in accordance with the obtained number of pixels, and
- generating image formation data using the correction amount of light amount determined for each predetermined pixel,
- wherein the correction amount of light amount is determined to be a fixed correction amount of light amount at a trailing region of the image where the density increase occurs, and is determined so that it smoothly reduces from the fixed correction amount of light amount in a predetermined region width from a leading edge side of the trailing region toward the leading edge side of the image.
A computer-readable storage medium storing a computer program for causing a computer to execute each step of a method of controlling an image forming apparatus provided with a photosensitive drum, an exposure unit operable to expose the photosensitive drum to form an electrostatic latent image on a surface of the photosensitive drum, and a developing roller operable to develop the electrostatic latent image formed on the surface of the photosensitive drum by using a developer, the method comprising:
- for each predetermined pixel of a plurality of pixels of image data to be formed, obtaining a number of pixels to be developed on a downstream side in a sub-scanning direction from the predetermined pixel,
- in order to correct a density increase that occurs at a trailing edge of an image to be formed in accordance with a peripheral speed difference between the photosensitive drum and the developing roller, determining a correction amount of light amount for each predetermined pixel of the plurality of pixels in accordance with the obtained number of pixels, and
- generating image formation data using the correction amount of light amount determined for each predetermined pixel,
- wherein the correction amount of light amount is determined to be a fixed correction amount of light amount at a trailing region of the image where the density increase occurs, and is determined so that it smoothly reduces from the fixed correction amount of light amount in a predetermined region width from a leading edge side of the trailing region toward the leading edge side of the image.
Dependencies are inferred from the claim text.