| 摘要 |
A magnet roll assembly for use in an apparatus developing an electrostatic latent image has a permanent magnet member providing a plurality of circumferentially spaced magnetic poles and a non-magnetic sleeve surrounding the permanent magnet member, the non-magnetic sleeve having a roughened surface region terminating at both ends inward relative to both ends of the permanent magnet member, a distance which can be proportional to the pitch of the magnetic poles at the sleeve surface whereby a magnetic developer layer of substantially uniform height is formed along the length of the sleeve surface. The surface roughness of the roughned surface region of the sleeve lies preferably within the range of from 0.5 mu m to 3 mu m (Rz). The magnet roll assembly is applicable to both magnetic brush-type and jumping-type developing apparatuses.
|
