Image forming apparatus, control method of image forming apparatus and program
AssigneeCanon Kabushiki Kaisha
InventorJunya Arakawa
Life of this patent
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Abstract
In an image forming apparatus for making a position deviation correction, a position deviation amount can be accurately calculated by stabilizing the detection result at position deviation detecting and considering an ideal correction amount and an actual correction amount to make the position deviation correction accurately. A forming unit forms a pattern for position deviation detection without making the position correction for less than one pixel by an image position correcting unit, to a pattern formed in the vicinity of a detection region of a detecting unit, and the position deviation amount is calculated by using a value of a position correction which is not made to the pattern for position deviation detection to be formed.
Claims6
An image forming apparatus comprising:
- an image position correcting unit for making a position correction of an image in a sub scan direction to image data, the position correction including a position correction for less than one pixel and a position correction in one pixel unit;
- an image forming unit for forming a pattern for position deviation detection as the image data to which the position correction is made;
- a detecting unit for detecting the formed pattern for position deviation detection;
- a position deviation amount calculating unit for calculating a position deviation amount of the image data based upon the detected pattern for position deviation detection;
- and
- a control unit for controlling the forming unit to form the pattern for position deviation detection without making the position correction of the image for less than one pixel by the image position correcting unit to a pattern formed in the vicinity of a detection region of the detecting unit, and for controlling the position deviation amount calculating unit to calculate the position deviation amount using a value of a position correction which is not made to the formed pattern for position deviation detection.
A control method in an image forming apparatus provided with a detecting unit for detecting a pattern for position deviation detection as formed image data comprising:
- an image position correcting step for making a position correction of an image in a sub scan direction to image data, the position correction including a position correction for less than one pixel and a position correction in one pixel unit and not making the position correction of the image for less than one pixel to the pattern for position deviation detection formed in the vicinity of a detection region of the detecting unit;
- an image forming step for forming a pattern for position deviation detection to which the position correction is made by the image position correcting step;
- a detecting step for detecting the formed pattern for position deviation detection;
- and
- a position deviation amount calculating step for calculating the position deviation amount based upon the detected pattern for position deviation detection using a value of a position correction which is not made to the formed pattern for position deviation detection.
Dependencies are inferred from the claim text.