Patent ID: 6278849
Filing Date: 2001-08-21
Classification: G03G

Abstract:
A developing apparatus for developing an electrostatic latent image formed on an image carrying member with developer, the developing apparatus comprising:a developer carrying member for carrying developer and conveying it to a developing region;a conductive contact member positioned to come into contact with the developer carrying member at an upstream side of the developing region with respect to the developer conveying direction; anda voltage applying member for applying the developer carrying member with a predetermined direct voltage as a developing voltage, applying the contact member with a direct voltage which has the same polarity as the developing voltage and has an absolute value larger than the developing voltage, and applying between the developer carrying member and the contact member an alternating voltage;wherein a ratio t.sub.1 /t.sub.2 of a time t.sub.1 for applying a voltage of absolute value larger than that of a center voltage of the alternating voltage to a time t.sub.2 for applying a voltage of absolute value smaller than that of the center voltage of the alternating voltage satisfies a relation of t.sub.1 /t.sub.2 >1.