A magnetic brush developing apparatus.

摘要

A magnetic brush developing apparatus, comprising: a development container for containing a developer (4); a magnet (1b) stationarily located in the development container (7) and having magnetic poles radially provided on a plurality of points; a rotational sleeve (1a) arranged to cover the outer circumference of the magnet (1b) and rotatably driven to carry the developer (4) in the development container (7); and a blade (2) arranged opposite to the rotational sleeve (1a) to restrict the amount of the developer (4) which is carried by the rotational sleeve (1a). To obtain a uniform image quality without unevenness among different developing apparatus and a wider range of assembling precision to thus facilitate the installment of the apparatus, at the position (6a) facing the developer restriction member (2), and in its vicinity (6), there is formed a uniform magnetic flux density section (Z) having a magnetic flux density whose vertical component is substantially uniform on the periphery of the rotational sleeve (1a). <IMAGE>