JP2006162698A5

JP2006162698A5 -

Info

Publication number: JP2006162698A5
Application number: JP2004350302A
Authority: JP
Filing date: 2004-12-02
Publication date: 2008-01-24

Claims

An image carrier, an exposure unit for exposing and scanning on the image bearing member, and an image forming unit having a developing unit for visualizing the recording material with electrostatic latent image generated by exposure, along the conveying direction of the recording medium Image forming apparatuses arranged side by side,
An image data storing means for storing the images data,
Exposure deviation amount storage means for storing exposure deviation amount information indicating the deviation amount with respect to the exposure scanning direction on the image carrier of each image forming unit;
Coordinate conversion means for converting the coordinates of the read address to the image data storage means based on the exposure deviation amount information stored in the exposure deviation amount storage means , and reading out the pixel data in accordance with the converted address information;
Correction means for correcting the gradation of the pixel data read by the coordinate conversion means based on the converted address information;
Halftone means for Halftone processing on the pixel data obtained by the correction means,
An image forming apparatus comprising: output means for outputting pixel data obtained by the halftone means as an exposure control signal of an exposure section of a corresponding image forming section.

The exposure deviation amount storage means includes
Storing position information relating to a plurality of positions in the main scanning direction, which is an ideal scanning exposure direction of the image carrier, and distance information relating to the distance between the ideal scanning exposure and the actual exposure at each position. The image forming apparatus according to claim 1.

The coordinate conversion means includes
Calculation means for calculating inclination information of exposure deviation in each region indicated by each position information based on the position information stored in the exposure deviation amount storage means and the distance information;
And X address generating means for generating an X address in the main scanning direction is exposed direction from the image data storage means,
Determination means for determining in which region the X address is calculated by the calculation means each time the X address is updated by the X address generation means;
Selection means for selecting relevant inclination information based on the result determined by the determination means;
Adding means for accumulatively adding the inclination information selected by the selecting means;
And a Y address generation means for generating a Y address to the integer part of the value resulting from adding by said adding means and an offset value of the Y address,
Wherein the correction means is characterized by generating pixel data after tone correction on the basis of the data of two successive pixels in the sub-scanning direction based on the decimal value of the cumulative added value by the adding means The image forming apparatus according to claim 2.

An image carrier, an exposure unit for exposing and scanning on the image bearing member, and an image forming unit having a developing unit for visualizing the recording material with electrostatic latent image generated by exposure, along the conveying direction of the recording medium A method for controlling image forming apparatuses arranged side by side,
And storing the images data in the image data storage means,
A step of reading out the exposure shift amount information from a predetermined exposure shift amount storage means for storing exposure shift amount information indicating the shift amount with respect to the exposure scanning direction on the image carrier of each image forming unit;
A coordinate conversion step of converting the coordinates of the read address to the image data storage means based on the read exposure deviation amount information, and reading the pixel data according to the converted address information;
A correction step of correcting the gradation of the pixel data read by the coordinate conversion step based on the converted address information;
A halftone step of performing Halftone processing on the pixel data obtained by the correction process,
An output step of outputting the pixel data obtained in the halftone step as an exposure control signal of an exposure unit of the corresponding image forming unit.

The exposure deviation amount storage means includes
Storing position information relating to a plurality of positions in the main scanning direction, which is an ideal scanning exposure direction of the image carrier, and distance information relating to the distance between the ideal scanning exposure and the actual exposure at each position. The method of controlling an image forming apparatus according to claim 4.

The coordinate conversion step includes
And position information stored in said exposure shift amount storage means, based on the distance information, a calculation step of calculating an inclination information of the exposure deviation in the area indicated by the position information,
And X address generation step of generating the X addresses in the main scanning direction is exposed direction from the image data storage means,
A determination step of determining in which region the X address is calculated in the calculation step each time the X address is updated by the X address generation step;
A selection step for selecting the corresponding inclination information based on the result determined in the determination step;
An addition step of cumulatively adding the slope information selected in the selection step;
A Y address generating step for generating a Y address using the integer part of the value obtained by the addition step as an offset value of the Y address,
Wherein the correction process, and generates the pixel data after tone correction on the basis of the data of two successive pixels in the sub-scanning direction based on the decimal value of the accumulated sum by the adding process values The method for controlling an image forming apparatus according to claim 5.