Image forming apparatus for automatically setting image formation conditions
AssigneeCanon Kabushiki Kaisha
InventorsTetsuya Atsumi, Hisashi Fukushima, Nobuatsu Sasanuma
Life of this patent
Estimating the term…
Abstract
This invention relates an image forming apparatus capable of automatically adjusting image formation conditions. A transfer medium having a detecting pattern image formed by an apparatus main body is read by an original reading unit. A look-up table for setting latent image formation conditions is corrected on the basis of a read output, thereby correcting image densities in a main-scan direction and/or a sub-scan direction.
Claims11
An image forming apparatus capable of automatically adjusting image formation conditions, comprising:
- original reading means for reading an original image to output the read result as an electrical signal;
- pattern latent image forming means having a digital optical system for forming an electrostatic latent image based on a predetermined detecting pattern in an image formation region of an electrophotographic photosensitive body;
- developing means for developing the formed pattern latent image by using a toner;
- transferring means for transferring the pattern developed image formed on said photosensitive body onto a transfer medium;
- fixing means for finally fixing the pattern image on the transfer medium and outputting the fixed image;
- and
- correcting means for correcting a charging condition of latent image formation conditions on the basis of the read output from said original reading means,
- wherein the transfer medium having the detecting pattern image is read by said original reading means, and a charge quantity in a main-scan direction as a scan direction of said digital optical system is corrected on the basis of a read output.
An image forming apparatus capable of automatically adjusting image formation conditions, comprising:
- original reading means for reading an original image to output the read result as an electrical signal;
- pattern latent image forming means having a digital optical system for forming an electrostatic latent image based on a predetermined detecting pattern in an image formation region of an electrophotographic photosensitive body;
- developing means for developing the formed pattern latent image by using a toner;
- transferring means for transferring the pattern developed image formed on said photosensitive body onto a transfer medium;
- fixing means for finally fixing the pattern image on the transfer medium and outputting the fixed image;
- and
- correcting means for correcting developing conditions of said developing means on the basis of the read output from said original reading means,
- wherein the transfer medium having the detecting pattern image is read by said original reading means, and a developing power in a sub-scan direction as a scan direction of said digital optical system is corrected on the basis of a read output,
- wherein the correction of the developing power is performed by changing a distance between said photosensitive body and a developing roller of said developing means.
A density adjusting method for a copying apparatus, comprising the steps of:
- copying a test image;
- reading the test image on a copied recording member and outputting an electric signal group at a reader portion of said copying apparatus;
- providing a predetermined converting treatment to the electric signal group and converting the electric signal to density signal group;
- and
- correcting the converting treatment so as to reduce a variation of the density signal group.
Dependencies are inferred from the claim text.