| 摘要 |
PURPOSE:To obtain a distinct picture having high density by specifying a relation of resistivity between that in compressed state and chain-likely connected state with a carrier in a magnetic field. CONSTITUTION:A carrier having a relation between a resistivity X(ohm.cm) for 1,000V impressed voltage when compressed under a load and an impressed voltage Y(ohm.cm) when connecting the particles chain-likely in a magnetic field at 1,600 Gauss defined by an expression 1.7<=X/Y<=3.3, is used. Thus, a balance of a transferred amt. to a latent image of toner at either a fast copying speed and low copying speed with a scraped amt. of the excess toner or deposited toner to a nonimage part by a magnetic brush, is held in a satisfactory condition. Thus, a carrier for developer having superior characteristic for maintaining picture image density, causing no fog in the picture image nor brush mark nor carrier dragging, and forming a distinct picture image, is obtd. |
