Image forming apparatus

Details Image forming apparatus Image forming apparatus

2006-09-18

2008-12-30

Lee, Susan S (Department: 2852)

Electrophotography

Control of electrophotography process

Control of developing

C399S285000

Reexamination Certificate

active

07471909

ABSTRACT:
An image forming apparatus including: an image bearing member having a photoconductive layer of a capacitance per unit area of 1.7×10−6(F/m2) or more; and a developing device having a developer carrying member to which development voltage is applied for developing a latent image to form a toner image on the image bearing member, wherein the following expression is satisfied:QM≥0.95×Vcont(MS)×(Lt2⁢ɛ0⁢ɛt+Ldɛ0⁢ɛd)where Q/M (C/g): an electric charge quantity per unit weight of the toner image, Vcont: a potential difference between a surface potential of the image bearing member and a direct current component of the development voltage, M/S (g/m2): a toner weight per unit area of the maximum density portion, Lt(m): a toner layer thickness in the maximum density portion, Ld(m): a photoconductive layer thickness, εt: a relative permittivity of the toner layer, εd: a relative permittivity of the photoconductive layer, and ε0(F/m): a vacuum permittivity.

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