IMAGE FORMATION DEVICE AND PROCESS CARTRIDGE

Japanese Patent JP2020079902

A

To provide an image formation device that can prevent generation of an image deletion by controlling isolation of an external additive even with a structure that maintains durability of a photoreceptor.SOLUTION: An image formation device comprises: an image carrier; latent image formation means for forming an electrostatic image on the image carrier; a developer carrier for developing the electrostatic image formed on the image carrier using a developer; a regulating member for regulating the developer carried by the developer carrier to develop the electrostatic image; and regulating bias application means for applying a regulating bias on the regulating member. The developer contains a toner having toner particles, inorganic silicon fine particles present on the surface of the toner particles, and metal soap. The amount of water washing transition of the inorganic silicon fine particle is 0.20 mass% or less. The range of the peripheral velocity ratio, which is a ratio in peripheral velocity of the developer carrier to the image developer, is 120% to 300%. The dark part potential Vd on the surface of the image carrier and the regulating bias Vb satisfy the relationship of Vd