Patent ID: 7289756

Claim:
A developer regulating member, which abuts against a developer carrying member, which carries a mono-component developer to regulate a layer thickness of the developer on the developer carrying member, said developer regulating member comprising: a supported portion to be supported by a support member; and an abutting portion, which abuts against the developer carrying member, surface roughness parameters of said abutting portion satisfying the following expressions (1) to (5): 0.030 ≦Sm≦ 0.170 (1) Rpk≦2.0 (2) Rp≦5.0 (3) 0.10 ≦Rvk ×(100− Mr 2 )/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 Mr 2 is a profile bearing length ratio [%] corresponding to the lower limit value of a level difference Rk of a roughness core.