| 摘要 |
It is an exemplified object of the present invention to provide a developer, a development device and its elements, and an image-forming device that can more stably form a high-quality image by a relatively inexpensive and easy means. A noncontact-type development method according to the present invention utilizes a nonmagnetic and single component toner having a volume average particle diameter D (mum) and an average specific charge q/m (muC/g), a development roller having a ten-point average surface roughness Rz (mum), and a blade keeping in contact with the development roller at a blade line pressure Pb (gf/cm). In order to stably form a uniform toner layer dt (mum) on the development roller, the following relationship is to be met: dt=1.8x{q/mxRz/(Pb-1)}½xD±0.25 D, and 1.5 D<=dt<=3.5 D.
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