Patent ID: 8843019

Claim:
A development device comprising: a development casing; a developer bearer to carry by rotation two-component developer including toner and carrier, the developer bearer disposed facing a latent image bearer through an opening formed in the development casing; a magnetic field generator disposed inside the developer bearer; a developer regulator to adjust an amount of developer carried on the developer bearer, the developer regulator extending in an axial direction of the developer bearer perpendicular to a direction of rotation of the developer bearer and disposed with an end face thereof facing the developer bearer across a predetermined regulation gap; and a first axial end seal provided in an axial end portion of the development device outside an image range, the first axial end seal disposed in contact with an upstream face of the developer regulator in the direction of rotation of the developer bearer to reduce a size of a clearance (C 1 ) between the developer regulator and the development casing.