Image forming apparatus

An image forming apparatus comprising:

• an image carrying member that has an amorphous silicon photosensitive layer formed on a surface thereof;
• a charging device that electrostatically charges the surface of the image carrying member;
• an exposure device that exposes the surface of the image carrying member electrostatically charged by the charging device to light to form an electrostatic latent image with reduced electrostatic charge;
• a development device including a developer carrying member that carries two-component developer containing toner and carrier, the development device supplying the image carrying member with the toner in the developer carried on the developer carrying member to develop the electrostatic latent image into a toner image;
• and
• a development voltage power supply that applies to the developer carrying member a development voltage resulting from superposing an alternating-current voltage Vac on a direct-current voltage Vdc;
• wherein
• when a blank part potential on the image carrying member is V0 [V], a peak-to-peak value of the alternating-current voltage Vac is Vpp [kV], and a gap between the image carrying member and the developer carrying member is Ds [mm], then formulae (1) and (2) below are fulfilled:
• 10
• ≤
• V
• ⁢
• 0
• -
• Vdc
• ≤
• 90
• (
• 1
• )
• 1.2
• ≤
• Vpp
• /
• Ds
• ≤
• 3.5
• .
• (
• 2
• )