| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an image of high quality, having proper solid filling by enhancing the development contribution ratio of a toner, regardless of the size of the diameter of a photoreceptor and making image density in a solid part high. <P>SOLUTION: When the height of a head of a developer on a developing sleeve 111a at a magnetic field zero point, in which magnetic force of a developing main magnetic pole is zero, is h and a developing gap at the nearest distance between the developing sleeve 111a and a photoreceptor drum 1 is a, a=h is satisfied. Image quality evaluation is performed, in combination with the photoreceptor drum 1 changing the outside diameter and the developing sleeve 111a, by changing h and an angle from the developing gap to the magnetic field zero point, and a proper or optimum value or range is selected from the result of the image quality evaluation to set various conditions. When a distance from the magnetic field zero point on a line segment b, passing through the magnetic field zero point to the photoreceptor drum 1, by passing through the rotation center of the developing sleeve 111a and in parallel with a magnetic field center line e, combined to the magnetic field center of the developing main magnetic pole is L, the size of L is measured to make the measured value cope with the image quality evaluation, and a proper or optimum value or the range for the size of L is selected. <P>COPYRIGHT: (C)2003,JPO |
