US 2023/0400804 A1Published application

Image forming apparatus that forms image on sheet using tone correction condition corresponding to process speed

AssigneeCanon Kabushiki Kaisha

InventorsTatsuomi MURAYAMA, Tadashi FUKUDA, Akihito YOKOTE

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Abstract

An image forming apparatus includes a storage unit configured to store first conversion information for converting a density of an image formed on an image carrier at a process speed into a density at another process speed among a plurality of process speeds; and a control unit configured to form a plurality of first patch images of different densities on the image carrier, with respect to each of the plurality of process speeds, determine respective densities of the plurality of first patch images based on a process speed at the time of formation of each of the plurality of first patch images and the first conversion information, and generate pieces of the tone correction condition that respectively correspond to the plurality of process speeds.

Claims12

Dependent claims

An image forming apparatus that forms an image on a sheet using a tone correction condition corresponding to a process speed, the image forming apparatus comprising:

an image forming unit configured to form an image on an image carrier;
a first detection unit configured to detect a density of the image formed on the image carrier;
a storage unit configured to store first conversion information for converting the density of the image formed on the image carrier by the image forming unit into a density at a process speed that is different from a process speed at the time of formation of the image among a plurality of process speeds;
and
a control unit configured to
while the image is formed on the sheet in accordance with a print job, form a plurality of first patch images of different densities on the image carrier by controlling the image forming unit,
with respect to each of the plurality of process speeds, determine respective densities of the plurality of first patch images based on respective densities of the plurality of first patch images detected by the first detection unit, a process speed at the time of formation of each of the plurality of first patch images, and the first conversion information, and
generate pieces of the tone correction condition that respectively correspond to the plurality of process speeds based on the respective densities of the plurality of first patch images that have been determined with respect to each of the plurality of process speeds.

5 more elements

An image forming apparatus that forms an image on a sheet using a tone correction condition corresponding to a process speed, the image forming apparatus comprising:

an image forming unit that includes a photosensitive member, a charging unit configured to charge the photosensitive member, an exposure unit configured to form an electrostatic latent image on the photosensitive member by exposing the charged photosensitive member to light at an exposure intensity indicated by the tone correction condition, a development unit configured to form the image on the photosensitive member by developing the electrostatic latent image, and a transfer unit configured to transfer the image formed on the photosensitive member to a sheet either directly or via the image carrier;
a detection unit configured to detect a density of the image formed on the image carrier or the photosensitive member;
a storage unit configured to store conversion information indicating a relationship among the exposure intensities at a plurality of process speeds with which a difference between a potential on an exposed region of the photosensitive member exposed by the exposure unit and a development potential of the development unit becomes the same;
and
a control unit configured to
while the image is formed on the sheet in accordance with a print job, form a patch image on the image carrier or the photosensitive member by controlling the image forming unit, and
determine a first exposure intensity used at a first process speed at the time of formation of the patch image by adjusting the exposure intensity at the time of formation of the patch image based on a difference between a density of the patch image detected by the detection unit and a target density of the patch image, and determine a second exposure intensity used at a second process speed among the plurality of process speeds based on the first exposure intensity and the conversion information, the second process speed being different from the first process speed.

4 more elements

An image forming apparatus that forms an image on a sheet using a tone correction condition corresponding to a process speed, the image forming apparatus comprising:

an image forming unit that includes a photosensitive member, a charging unit configured to charge the photosensitive member, an exposure unit configured to form an electrostatic latent image on the photosensitive member by exposing the charged photosensitive member to light at an exposure intensity indicated by the tone correction condition, a development unit configured to form the image on the photosensitive member by developing the electrostatic latent image, and a transfer unit configured to transfer the image formed on the photosensitive member to a sheet either directly or via the image carrier;
a storage unit configured to store conversion information indicating a relationship among the exposure intensities at a plurality of process speeds with which a difference between a potential on an exposed region of the photosensitive member exposed by the exposure unit and a development potential of the development unit becomes the same;
a detection unit configured to detect a potential on a surface of the photosensitive member;
and
a control unit configured to
form a first exposed region on the photosensitive member by exposing the photosensitive member to light by way of control on the image forming unit while the image is formed on the sheet in accordance with a print job, and
determine a first exposure intensity used at a first process speed at the time of formation of the first exposed region by adjusting the exposure intensity at the time of formation of the first exposed region based on a difference between a potential on the first exposed region detected by the detection unit and a target potential of the first exposed region, and determine a second exposure intensity used at a second process speed among the plurality of process speeds based on the first exposure intensity and the conversion information, the second process speed being different from the first process speed.

4 more elements

Dependencies are inferred from the claim text.