Abstract: An image forming apparatus which performs exposure for “n” lines in one scan by scanning “n” light rays from “n” light sources in a main scanning direction of an image carrier, where “n” is an integer greater than 1, including: a laser driving section; and a control section which, corresponding to density unevenness generated in an adjoining section of a nth exposure in a Nth scan and a first exposure in a N+1th scan, determines a correction value of exposure amount to resolve the density unevenness for the nth exposure amount in the Nth scan and the first exposure amount in the N+1th scan, along with that, determines a correction value of each exposure amount for the “n” lines, based on the correction values of the first and nth exposure amount.

Abstract: An image forming apparatus for simultaneously conducting multiple lines of exposure by scanning multiple laser beams from multiple light sources onto an image carrier in a main scanning direction, including: multiple light sources which are driven to emit laser beams based on image data; and a control section capable of controlling an image formation in two types of image forming modes of a first image forming mode where an image is formed at a first image forming speed by using all the multiple light sources, and a second image forming mode where the image is formed without using at least one of the multiple light sources at a second image forming speed slower than the first image forming speed, wherein the control section controls a light source which is not used in the second image forming mode to emit a laser beam onto outside of an image area.

Abstract: An image forming apparatus which performs exposure for “n” lines in one scan by scanning “n” light rays from “n” light sources in a main scanning direction of an image carrier, where “n” is an integer greater than 1, including: a laser driving section; and a control section which, corresponding to density unevenness generated in an adjoining section of a nth exposure in a Nth scan and a first exposure in a N+1th scan, determines a correction value of exposure amount to resolve the density unevenness for the nth exposure amount in the Nth scan and the first exposure amount in the N+1th scan, along with that, determines a correction value of each exposure amount for the “n” lines, based on the correction values of the first and nth exposure amount.

Abstract: An image forming apparatus for simultaneously conducting multiple lines of exposure by scanning multiple laser beams from multiple light sources onto an image carrier in a main scanning direction, including: multiple light sources which are driven to emit laser beams based on image data; and a control section capable of controlling an image formation in two types of image forming modes of a first image forming mode where an image is formed at a first image forming speed by using all the multiple light sources, and a second image forming mode where the image is formed without using at least one of the multiple light sources at a second image forming speed slower than the first image forming speed, wherein the control section controls a light source which is not used in the second image forming mode to emit a laser beam onto outside of an image area.

Abstract: A laser optical unit in a laser optical apparatus having a scanner for scanning a beam in a main scanning direction, includes: a laser light source including two light-emitting elements, time for which one light-emitting element lights overlapping with time for which the other light-emitting element lights; a collimating lens located for two beams emitted from the light source; and a slit located for the two beams for limiting travel of the two beams from the collimating lens to the scanner, wherein 0.9 ?cos?? (w·d)/(0.872·f·?) where ?(°) is an angle at which a direction in which the two light-emitting elements are arranged and a sub scanning direction meet, d(?um) is distance between the two light-emitting elements, ?(nm) is wavelength of laser light, f(mm) is focal length of the collimating lens, and w(mm) is width of the slit.