| 摘要 |
PURPOSE:To prevent an image floating phenomenon generated when the image is left in environment of high temperature and high humidity by a method wherein an amount of adding silica added to toner positively charged is specified. CONSTITUTION:Adding amount of silica 12 added to toner positively charged is set to 0.2wt% or more. Hydrophobic silica 12 in developer agent added to improve flowability is increased by 0.2wt% or more, resulting in that the silica 12 is adhered to an image background part positively charged at the time of development with a developer roller 3, thereby a degree of closeness of a sheet 100 to a photo-sensitive member 1 is decreased when a transferring operation with a transferring charger 4 is carried out and adhesion of paper powder or the like onto a surface of the photo-sensitive member 1 can be prevented. With such an arrangement, it is possible to prevent an image floating phenomenon generated when the image is left in environment of high temperature and high humidity. |
