Patent ID: 10948848

Abstract:
An image forming apparatus includes an image holding member, a charging unit, an electrostatic image forming unit, a developing unit that includes an electrostatic image developer and develops the electrostatic image with the electrostatic image developer, a transfer unit, a fixing unit, a replenishment toner container that includes a replenishment toner that is to be supplied into the developing unit and discharges the replenishment toner by rotation of the replenishment toner container, a replenishment toner container mounting unit that holds the replenishment toner container and rotates the replenishment toner container, and a toner supply pass that connects the replenishment toner container mounting unit to the developing unit. The replenishment toner includes toner particles and silica particles having a number average particle size of 110 nm to 130 nm, a large-diameter-side number particle size distribution index (upper GSDp) of less than 1.080, and an average circularity of 0.94 to 0.98, wherein 80 number % or more of the silica particles have a circularity of 0.92 or more.