Image forming apparatus

An image forming apparatus comprising:

• an image carrying member that includes a photosensitive layer formed on a surface thereof;
• a charging device that charges the image carrying member to a prescribed surface potential;
• an exposure device that exposes the surface of the image carrying member charged by the charging device so as to form an electrostatic latent image with attenuated electrostatic charge;
• a developing device that includes:
• a development container which contains a non-magnetic one-component developer composed only of a toner;
• a developer carrying member which is brought into pressure contact with the image carrying member at a prescribed pressing force and carries the toner on an outer circumferential surface to form a toner layer;
• and
• a regulation blade which makes contact with the outer circumferential surface of the developer carrying member so as to regulate a thickness of the toner layer formed on the outer circumferential surface of the developer carrying member, the developing device supplying the toner to the image carrying member on which the electrostatic latent image has been formed;
• a development voltage power supply that applies a development voltage to the developer carrying member;
• and
• a control section that controls driving of the developing device and the development voltage power supply,
• wherein the developer carrying member includes a rotary shaft and a roller portion stacked on an outer circumferential surface of the rotary shaft,
• a resistance value of the roller portion is 9 to 11 [Log Ω], and
• when an amount of the toner conveyed on the developer carrying member and regulated by the regulation blade is Md [g/m2], an amount of the toner adhered on the image carrying member in a solid image by movement of the toner from the developer carrying member to the image carrying member due to the development voltage is Mp [g/m2], a peripheral speed of the developer carrying member is Sd [mm/sec], and a peripheral speed of the image carrying member is Sp [mm/sec], formulae (1) and (2) below are satisfied,
• 0.8×Sd/Sp<Mp/Md (1)
• 0.8≤Sd/Sp≤1.2. (2)