Patent ID: 7835656
Filing Date: 2010-11-16
Classification: G03G

Abstract:
1. A developing device comprising: a developer carrier that is rotated while holding a developer on a surface; a first housing chamber that houses the developer to be supplied to the developer carrier; a second housing chamber that has a bottom face that is lower than a bottom face of the first housing chamber in a gravitational direction; a first inflow portion that allows the developer to flow from the second housing chamber into the first housing chamber; a first conveying member that is provided in the first housing chamber, and that conveys the developer in the first housing chamber; a second conveying member that is provided in the second housing chamber, and that conveys the developer in the second housing chamber in a second conveying direction directed toward the first inflow portion; and a concentration detecting member that is provided in the bottom face of the second housing chamber upstream from the first inflow portion in the second conveying direction, and that detects a concentration of the developer housed in the second housing chamber, wherein: the second conveying member includes: the second housing chamber includes: wherein a part of the inner wall face of the second housing chamber, including the region where the concentration detecting member is provided, is projected from the region of the inner wall face opposed to the first inflow portion.