Patent ID: 7873300

Claim:
A single component development device comprising: a toner comprising a resin, a coloring agent, a wax, a charge control agent and an inorganic particulate; a development roller which bears the toner on a surface of the development roller and transfers the toner to an image bearing member; and a thin layer forming member which regulates a thickness of a layer of the toner while in contact with the surface of the development roller via the toner borne thereon; wherein a regulating pressure A between the thin layer forming member and the development roller is between 25 to 60 (N/m), a content Z (weight %) of the charge control agent satisfies the following relationship (1) and an average dispersion particle diameter D (nm) of the charge control agent satisfies the following relationship (2): 0.029 ×A− 0.150 >Z> 0.013 ×A− 0.013 Relationship (1) D< 6.3 ×A− 106.3 Relationship (2).