US 7,583,281 B2 · Image forming apparatus

Abstract

An image forming apparatus capable of decreasing the image unevenness of a superimposed image at the time of forming starting (head) lines of the images in respective colors with different beams in order to decrease a shift of a superimposed image. Let a position, where an image in a first color is formed with a beam A as a leading beam, be (a). Let a starting position of formation of an image in a second color be (b), and one dot (line) of shift arises in the superimposed image. In order to decrease the shift of the superimposed image, image formation is performed with selecting a beam B as a beam which writes a head of the image (c). When image formation is performed for color shift reduction with changing a leading beam for each color image, tonality correction is performed to each beam for subsequent images so as to decrease image unevenness due to the difference between shapes and exposure power of respective beams.

Claims30

Dependent claims

An image forming method for generating a toner image from a latent image formed on an image carrier by a scan type writer and developer, the method comprising:

concurrently performing scans to form a latent image with a plurality of beams, the beams being adjacent in a subscanning direction;
selecting from the plurality of beams a beam which forms a headline at a time of formation of an image in each color to perform tonality correction on each beam to change beam emission characteristics of each beam to beam emission characteristics of the selected beam;
developing the latent image to form a toner image;
transferring the toner image onto an intermediate transfer member once for each respective color;
and
forming a color image by superimposing the toner images one at a time for each respective color.

3 more elements

An image writing apparatus comprising:

a writing mechanism including a plurality of beams, the beams being adjacent in a subscanning direction and configured to perform concurrent scans, the writing mechanism configured to select from the plurality of beams a beam which forms a headline at a time of formation of an image in each color to perform tonality correction on each beam to change beam emission characteristics of each beam to beam emission characteristics of the selected beam.

An image writing method for forming a latent image on an image carrier by a scan type writer, the method comprising:

concurrently performing scans to form a latent image with a plurality of beams, the beams being adjacent in a subscanning direction;
and
selecting from the plurality of beams a beam which forms a headline at a time of formation of an image in each color to perform tonality correction on each beam to change beam emission characteristics of each beam to beam emission characteristics of the selected beam.

Dependencies are inferred from the claim text.

Image forming apparatus

Life of this patent

Image forming apparatus

Life of this patent

Abstract

Claims30