Image forming apparatus and control method therefor
AssigneeCanon Kabushiki Kaisha
InventorHidehiko Kinoshita
Life of this patent
Estimating the term…
Abstract
An image forming apparatus image which is capable of accurately correcting the magnification of an image without degrading the quality of the formed image or reducing productivity, to thereby make it possible to cope with an increase in the operating speed of the apparatus. The image forming apparatus is comprised of an image processing section having an image area-separating section, and an image forming section having an exposure control section. The image area-separating section separates image data into at least two kinds of areas. The exposure control section performs magnification correction on at least one area of the image data separated by the image area-separating unit.
Claims4
An image forming apparatus comprising:
- a rotational image carrier;
- an image forming unit configured to form a latent image on the image carrier in a main scanning direction substantially perpendicular to a rotational direction of the image carrier, to develop the latent image as a toner image, and to transfer the toner image onto a recording medium, to thereby form an image on the recording medium;
- a determining unit configured to determine a position of a margin region, on which the toner image is not formed in the main scanning direction with respect to a rotational direction of the image carrier, based on input image data;
- and
- a magnification correcting unit configured to correct the input image data in order to correct magnification of the image with respect to the rotational direction of the image carrier,
- wherein the magnification correcting unit is configured to increase a width of the margin region with respect to the rotational direction of the image carrier in order to expand the magnification of the image with respect to the rotational direction of the image carrier, and to reduce the width of the margin region with respect to the rotational direction of the image carrier in order to reduce the magnification of the image with respect to the rotational direction of the image carrier.
A method of controlling an image forming apparatus including a rotational image carrier, the method comprising:
- an image forming step of forming a latent image on the image carrier in a main scanning direction substantially perpendicular to a rotational direction of the image carrier, developing the latent image as a toner image, and transferring the toner image onto a recording medium, to thereby form an image on the recording medium;
- a determining step of determining a position of a margin region, on which the toner image is not formed in the main scanning direction with respect to a rotational direction of the image carrier, based on input image data;
- and
- a magnification correction step of correcting the input image data in order to correct magnification of the image with respect to the rotational direction of the image carrier,
- wherein the magnification correcting step includes increasing a width of the margin region with respect to the rotational direction of the image carrier in order to expand the magnification of the image with respect to the rotational direction of the image carrier, and reducing the width of the margin region with respect to the rotational direction of the image carrier in order to reduce the magnification of the image with respect to the rotational direction of the image carrier.
Dependencies are inferred from the claim text.