Patent ID: 8043081

Claim:
A mold for forming a developer blade having a belt-like metal plate and an elastic member adhering to the metal plate in parallel with the metal plate, wherein the mold comprises a plate accommodation space in which the metal plate is accommodated and a belt-like cavity for forming the elastic member adjacent to the plate accommodation space, and wherein at least a part of a cavity surface defining the cavity in the cross section taken along the cavity width direction is finished to have a surface roughness Ry of not more than 10 μm, and wherein when the cavity surface is divided into two sides in the cross section taken along the cavity width direction with a given point on the surface being as their border, each side having a different roughness, only one side is finished to have a surface roughness Ry of not more than 10 μm and the cavity surface of the other side has a surface roughness of not more than 1.5 μm, and border point ( 21 ) are arranged near point (Q) on the cavity surface corresponding to a development roller closet point (P) on the elastic member in a position where the developer blade is to be installed in a device, the border point on the cavity surface as a border is arranged such that the distance in either direction from the point (Q) on the cavity surface corresponding to the point (P) has a value of up to 2 mm in the cross section taken along the cavity width direction.