Patent attributes
A developer regulating member abutting against a developer carrying member carrying a mono-component developer to regulate the layer thickness of the developer on the developer carrying member has a supported portion supported by a support member, and an abutting portion abutting against the developer carrying member, the surface roughness parameters of this abutting portion satisfying the following expressions (1) to (5):0.30≦Sm≦0.170 (1)Rpk≦2.0 (2)Rp≦5.0 (3)0.10≦Rvk×(100−Mr2)/100≦1.30 (4)Rpk<Rvk, (5)where Sm is a mean spacing [mm] of profile irregularities prescribed by JIS-B0601-1994, Rp is a maximum profile peak height [μm] prescribed by ISO4287-1997, Rpk is an initial wear height [μm] prescribed by DIN4776, Rvk is an oil retaining depth [μm] prescribed by DIN4776, and Mr2 is a profile bearing length ratio 2 [%] prescribed by DIN4776.
