Patent ID: 8204412
Filing Date: 2012-06-19
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image bearing member that bears an electrostatic image thereon; a charging device that charges said image bearing member; an exposure device that forms said electrostatic image by exposing a surface of said image bearing member, which has been charged to a dark potential V a developing device that has a developer carrying member on which a developer including a toner and a magnetic carrier is carried; and a power supply that applies a developing bias on said developer carrying member; wherein said developing bias is an oscillating voltage having a first peak voltage V a duty ratio Du (%), denoted by (T said magnetic carrier has a characteristic that: said magnetic carrier has a resistivity ρ which decreases in accordance with an increasing electric field strength, and a relative dielectric constant ∈ which increases in accordance with an increasing electric field strength; a product of a time constant ∈ said time constant ∈