Light Source Control Circuit, Image Forming Apparatus, And Light Source Control Method

A light source control circuit of an optical writing device that admits connection of any one of a plurality of different types of light sources and that forms an electrostatic latent image on a photosensitive element by a connected light source controlled by the light source control circuit, the light source control circuit comprising:

• a skew correction unit that corrects a skew of a main scanning line of an electrostatic latent image formed by the light source relative to the photosensitive element by acquiring image data of an image to be formed as the electrostatic latent image and by performing a predetermined process;
• a pattern generating unit that outputs image data for forming a predetermined pattern in an electrostatic latent image to be formed by acquiring image data in which the skew has been corrected and by performing a predetermined process;
• a local deviation correction unit that corrects a local deviation of an electrostatic latent image formed by the light source on the main scanning line by acquiring image data processed to form the pattern and by performing a predetermined process;
• a light source control unit that causes the light source to emit light based on image data in which the local deviation has been corrected;
• and
• a setting value input unit that inputs setting values which are referred to in an operation of each of the above units, wherein
• the skew correction unit corrects the skew between the light source and the photosensitive element by storing pixel data that includes information of each of pixels configuring the image data in a first line memory for each main scanning line, and by reading, at a position on the main scanning line corresponding to an input setting value, the pixel data after shifting a main scanning line stored in the first line memory in a sub-scanning direction,
• the pattern generating unit outputs image data for forming a predetermined pattern in the electrostatic latent image by converting pixel data corresponding to an input setting value among the pixel data read from the first line memory and by outputting the converted image data, and
• the local deviation correction unit corrects the local deviation by
• storing the pixel data converted and output for forming the predetermined pattern in a second line memory for each main scanning line,
• dividing the main scanning line and increasing a resolution in the sub-scanning direction by successively reading the pixel data from each main scanning line in the second line memory a number of times corresponding to an input setting value,
• shifting the main scanning line for reading the pixel data in the sub-scanning direction at a position, on the main scanning line, corresponding to a setting value input according to the connected light source,
• and reading the pixel data.