| abstract |
Provided is a replenishment developer and an image forming method that achieve high image quality and durability by high-speed printing. A developing device having a developer layer thickness regulating member for forming two developer carriers and a developer layer in the rotation direction of an image carrier is used to develop a replenishment developer having toner and a carrier. A developer for replenishment in a two-component developing method that develops while replenishing the apparatus and discharges the excess carrier inside the developing apparatus from the developing apparatus as necessary. The replenishment developer is added to 1 part by mass of the carrier. On the other hand, the toner containing a binder resin and a colorant is contained at a blending ratio of 2 parts by weight or more and 50 parts by weight or less, and the 50% particle size (D 50 ) based on the volume distribution of the carrier is 15 μm or more and 70 μm or less. And the true specific gravity of the carrier is 2.5 g / cm 3 or more and 4.2 g / cm 3 or less, and the magnetization intensity of the carrier is 40 Am 2 / kg under a magnetic field of 1000 / 4π (kA / m). more than 70Am 2 / k A replenishment developer, wherein the or less. [Selection figure] None |