DEVELOPING DEVICE PROVIDED WITH DEVELOPING ROLLER AND THICKNESS REGULATION BLADE

摘要

In a developing device, a developing roller has an outer peripheral surface movable in a moving direction upon rotation of the developing roller to transfer developing agent to a developing region having a width in an axial direction of the developing roller. A thickness regulation blade includes a rubber portion. The rubber portion provides a contact region in contact with the outer peripheral surface to provide a nip region relative to the developing roller. The contact region includes a first region; and a second region. The first region and the second region each extends in the axial direction by a length at least equal to or greater than the width of the developing region. The first region has a first surface roughness. The second region is positioned downstream of the first region in the moving direction and has a second surface roughness finer than the first surface roughness.

主权项

1. A developing device comprising:
a developing roller that is rotatable about a rotation axis defining an axial direction, the developing roller having an outer peripheral surface movable in a moving direction upon rotation of the developing roller to transfer developing agent to a developing region having a width in the axial direction; and a thickness regulation blade comprising:
a support portion; anda rubber portion supported by the support portion and providing a contact region in contact with the outer peripheral surface to provide a nip region relative to the developing roller, the contact region including:
a first region extending in the axial direction by a length at least equal to or greater than the width of the developing region, and positioned in alignment with the developing region in the moving direction, the first region having a first surface roughness; anda second region extending in the axial direction by a length at least equal to or greater than the width of the developing region, and positioned in alignment with the developing region in the moving direction, the second region being positioned downstream of the first region in the moving direction and having a second surface roughness finer than the first surface roughness.