Patent ID: 8903266
Filing Date: 2014-12-02
Classification: G03G

Abstract:
1. A developing device comprising: a housing; a developer supporting rotator disposed inside the housing, including, a toner supporting rotator disposed inside the housing including, a voltage application unit configured to apply a developing bias voltage between the toner supporting rotator and an image carrier, such that the toner supported by the toner supporting rotator flies to an electrostatic latent image on a surface of the image carrier to cause the electrostatic latent image to be developed into a toner image, wherein a longitudinal end portion of each of the pulurality of developer supporting side magnetic members is positioned more longitudinal outside than a longitudinal end portion of the toner supporting side magnetic member, a magnetic force generated in a vicinity of both longitudinal end portions is greater than a magnetic force generated at a longitudinally inner portion, with respect to an opposing magnetic member facing the toner supporting side magnetic member and a downstream magnetic member disposed more downstream in a rotational direction than the opposing magnetic member, among the plurality of developer supporting side magnetic members, the housing includes a sealing portion that projects from a position of the housing facing a longitudinal end face of the developer supporting rotator toward the longitudinal end face, such that the toner in a space between the longitudinal end face and an inner face of the housing is prevented from scattering outside the space, and the housing includes a concave portion that is positioned more longitudinally inside than the sealing portion and is configured to more recede in a direction away from a surface of the developer supporting rotator than the inner face of the housing that is located more longitudinally inside than the concave portion.