Patent ID: 7676184
Filing Date: 2010-03-09
Classification: G03G

Abstract:
1. A developing apparatus including a developer carrier, a supplying chamber configured to supply the developer to the developer carrier, and a storing chamber positioned above the supplying chamber and configured to store the developer; the developing apparatus comprising: a partitioning member positioned between the supplying chamber and the storing chamber, the partitioning member having a supplying port configured to supply the developer from the storing chamber to the supplying chamber and a returning port configured to return the developer from the supplying chamber to the storing chamber; a first rotating member that is provided in the storing chamber and that is configured to convey the developer in an axial direction; a second rotating member that is provided in the supplying chamber and that is configured to convey the developer in the axial direction, wherein the second rotating member is positioned directly below the returning port; wherein the second rotating member has a plurality of wings having inclinations that are inverted at an area directly below the returning port; and wherein when a distance between a bottom tip of the second rotating member and the partitioning member is “G”, a maximum width of the returning port in the axial direction is “Wp”, and a repose angle of the developer is “θ”, the width of the returning port satisfies a relationship of “θ>tan−1(2G/Wp).