| 摘要 |
The present invention achieves a configuration that, while minimizing the impact on the degree of freedom of layout of magnetic poles, can suppress at low cost changes in the distribution of the magnetic flux density in the vicinity of a regulating blade (9) for a developer regulation pole opposing the regulating blade (9). The position on the outer circumferential surface of a development sleeve at which the magnetic flux density in the direction normal to the outer circumferential surface of the development sleeve is maximized is the maximum value position. The position on the outer circumferential surface of the development sleeve corresponding to the center position in the range of the half-value of the magnetic flux density distribution of the developer regulation pole is the half-value center position. In such case, the developer regulation pole is formed such that the maximum value position is offset by at least three degrees in the circumferential direction of the development sleeve with respect to the half-value center position, and the position on the outer circumferential surface of the development sleeve opposing the regulating blade (9) is at the same side of the maximum value position as the half-value center position. |
