Patent ID: 8368734

Claim:
An exposure device comprising: a plurality of light-emitting elements; a lighting driver that drives and lights up the light-emitting elements based on image data; a first storage that stores light amount unevenness correction values of the respective light-emitting elements; a reader that reads the light amount unevenness correction values stored in the first storage; a shading correction unit that executes shading correction for the light amount unevenness correction values read by the reader; and a second storage that stores correction values obtained by having the shading correction unit to execute the shading correction for the light amount unevenness correction values, wherein the lighting driver controls light power of the respective light-emitting elements based on the correction values stored in the second storage, wherein the shading correction unit is provided at a preceding stage of the second storage, wherein the shading correction unit executes shading correction for the light amount unevenness correction values read by the reader by using a first correction coefficient output from a correlation coefficient calculation section and a second correction coefficient output from a correction coefficient storage section, and the second correlation coefficient corrects at least one of the light amount evenness of the light-emitting elements and abrasion evenness on a surface of photosensitive bodies, wherein the correlation coefficient calculation section comprises: a first selector that selects a first intermediate selection signal from a plurality of correction coefficients based on a coefficient selection signal; a flip flop that outputs the second correction coefficient based on a second intermediate signal; an adder that adds the output of the flip flop with the first intermediate selection signal and outputs an added signal; and a second selector that selects one of an initial correction value and the added signal and sends the second intermediate signal to the flip flop.