Developing device and image forming apparatus provided with same

摘要

A developing device includes a housing, a developer carrier, a conveying member and a surface layer. The developer carrier carries a developer on a circumferential surface. The conveying member is rotatably arranged in a first conveying portion and conveys the developer in the first conveying direction and supplies the developer to the developer carrier. The surface layer is formed on a surface of a predetermined cylindrical base member. The surface layer is formed by an immersion method of immersing the base member in a predetermined immersion tank so that an axial direction of the base member extends along a vertical direction. A lower end side of the base member at the time of the immersion is arranged in an upstream side of the housing and an upper end side of the base member at the time of the immersion is arranged in a downstream side of the housing.

主权项

1. A developing device, comprising:
a housing; a developer carrier formed into a cylindrical shape, supported in the housing rotatably about an axis and configured to carry a developer on a circumferential surface; a developer container arranged in the housing to face the developer carrier and including a first conveying portion in which the developer is conveyed in a first conveying direction from one end side toward the other end side in an axial direction of the developer carrier, and a second conveying portion which communicates with the first conveying portion at opposite end parts in the axial direction and in which the developer is conveyed in a second conveying direction opposite to the first conveying direction; a conveying member rotatably arranged in the first conveying portion and configured to convey the developer in the first conveying direction and supply the developer to the developer carrier; and a surface layer arranged on or arranged to face the circumferential surface of the developer carrier and formed on a surface of a predetermined cylindrical base member; wherein: the surface layer is formed by an immersion method of immersing the base member in a predetermined immersion tank so that an axial direction of the base member extends along a vertical direction; and a lower end side of the base member at the time of the immersion is arranged in an upstream side of the housing in the first conveying direction and an upper end side of the base member at the time of the immersion is arranged in a downstream side of the housing in the first conveying direction.