| 摘要 |
A non-magnetic one-component developer comprises a binder resin and a colorant, and has a volume-average particle diameter (dv) in a range of 5-15 mu m, a ratio (dv/dn) of the volume-average particle diameter (dv) to the number-average particle diameter (dn) in a range of 1.00-1.40, a quotient (Sc/Sr) obtained by dividing the area (Sc) of a circle supposing the absolute maximum length of a particle is a diameter by the real projected area (Sr) of the particle in a range of 1.00-1.30, a product (A*dn*D) of the specific surface area (A) (m<2>/g) as measured in accordance with the BET method, the number-average particle diameter (dn) ( mu m) and the true specific gravity (D) in a range of 5-10, and a ratio (Q/A) of the charge level (Q) ( mu c/g) to the specific surface area (A) in a range of 15-70. The developer is substantially spherical from both conditions of Sc/Sr and A*dn*D, and is suitable for use in a process for developing an electrostatic latent image formed on a photosensitive body with a developer by using a development apparatus equipped with a development roll and a development blade for controlling a layer of the developer supplied on the development roll to a uniform thickness. A development process making use of the non-magnetic one-component developer is also disclosed. |
