Patent ID: 9134643
Filing Date: 2015-09-15
Classification: G03G

Abstract:
1. An image forming apparatus that forms an image on a recording material, the image forming apparatus comprising: a plurality of image bearing members; a plurality of charging devices each configured to charge a corresponding image bearing member, by the same charging bias supplied from a mutually shared first power source, and to form a predetermined charging potential on a surface of the image bearing member; an exposure device configured to expose with a first laser power a non-image region to which a developer is not supplied from a developer bearing member, of a surface of the image bearing member to generate a non-image region potential, and to expose with a second laser power greater than the first laser power an image region to which developer is supplied from the developer bearing member to generate an image region potential; a plurality of developer bearing members each configured to supply a developer to an image region of a corresponding image bearing member, on a surface of which a predetermined development potential is formed; a storage device configured to acquire and store information about the plurality of image bearing members; and a control unit configured to control the charging bias, and the first laser power and the second laser power for each of the plurality of image bearing members, wherein the image forming apparatus is capable of executing a color mode for forming images of a plurality of colors using the plurality of developer bearing members, and a mono-mode for forming images of mono color using one developer bearing member of the plurality of developer bearing members, wherein the control unit, when the color mode is executed, determines the charging bias and, the first laser power and the second laser power for each of the plurality of image bearing members, based on information about the plurality of image bearing members, wherein the control unit, when the mono-mode is executed, determines the charging bias and, the first laser power and the second laser power for an image bearing member for the mono-mode, based on information about the image bearing member for the mono-mode, and wherein an absolute value of charging bias when the mono-mode is executed, is determined so as not to exceed an absolute value of charging bias when the color mode is executed.