Image forming apparatus and developer for developing electrostat

Details Image forming apparatus and developer for developing electrostat Image forming apparatus and developer for developing electrostat

1993-08-19

1996-07-09

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355219, 430109, G03G 1508

Patent

active

055349811

ABSTRACT:
An image forming apparatus includes a member to be charged for carrying an electrostatic image, a contact-charging means for charging the member to be charged in contact with the member to be charged, and a developing means for developing the electrostatic image carried on the member to be charged. The developing means includes a developer for developing the electrostatic image comprising a toner and hydrophobic inorganic fine powder. The hydrophobic fine powder has a hydrophobicity of 60% or higher and the toner has a volume average particle size of 4-8 microns. The hydrophobic inorganic fine powder not only improves the fluidity of the developer and adjusts the chargeability of the developer but also prevents difficulties due to interaction between the member to be charged and the contact charging means in the presence of residual developer, such as damages of the member to be charged and toner-sticking onto the member to be charged.

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