US 2007/0183817 A1 · Image forming apparatus

Abstract

An image forming apparatus in which image warp and shift are able to be more precisely suppressed to prevent the deterioration of image quality, including a fluctuation amount detection device for detecting at a fixed cycle sampling point the belt fluctuation amount of an intermediate transfer body from a reference position in the direction orthogonal to the running direction of the intermediate transfer body or the main scanning direction, and a control unit which, in accordance with belt fluctuation amount data that expresses the belt fluctuation amount detected by the fluctuation amount detection device, corrects start position data that expresses the write start position data in the main scanning direction of the write device, and alters the fixed cycle sampling point when the amount of change in the belt fluctuation amount data in adjacent sampling points of the fixed cycle sampling points is greater than a value set in advance.

Claims22

Dependent claims

An image forming apparatus for forming a superposed image by writing an electrostatic latent image on an image carrier by scanning-type write means, forming a toner image by developing said electrostatic latent image using toner, and transferring said toner image to an intermediate transfer body, comprising:

fluctuation amount detection means for detecting the fluctuation amount of said intermediate transfer body from a reference position in the direction orthogonal to the running direction of said intermediate transfer body (hereinafter referred to as a main scanning direction);
start position data correction means for correcting start position data that expresses the write start position in the main scanning direction of said write means in accordance with fluctuation amount data that expresses the fluctuation amount detected by said fluctuation amount detection means;
and
detection position altering means for altering said predetermined detection position when the amount of change of the fluctuation amount data in adjacent detection positions of said predetermined detection position is larger than a predetermined value.

1 more element

An image forming apparatus for forming a superposed image by writing an electrostatic latent image on an image carrier by a scanning-type write device, forming a toner image by developing said electrostatic latent image using toner, and transferring said toner image to an intermediate transfer body, comprising:

a fluctuation amount detection device configured to detect the fluctuation amount of said intermediate transfer body from a reference position in the direction orthogonal to the running direction of said intermediate transfer body (hereinafter referred to as a main scanning direction);
a start position data correction device configured to correct start position data that expresses the write start position in the main scanning direction of said write device in accordance with fluctuation amount data that expresses the fluctuation amount detected by said fluctuation amount detection device;
and
a detection position altering device configured to alter said predetermined detection position when the amount of change of the fluctuation amount data in adjacent detection positions of said predetermined detection position is larger than a predetermined value.

1 more element

Dependencies are inferred from the claim text.

Image forming apparatus

Life of this patent

Image forming apparatus

Life of this patent

Abstract

Claims22