Abstract
Scattering of toner particles contaminates the inside of PPC(Plain Paper Copier) and degrades copied picture quality. The copier is required to have a structure that prevents particles from scattering and controls air flow. However, as there exist moving elements, exothermic elements and electromagnetic field, air flow and particle behaviour become complicated.
In this report, we show a laser using prototype device by which the particle behaviour in a narrow space of developing unit of PPC can be visualized. The optimal design data for space gap were obtained.
