Developing apparatus

Details Developing apparatus Developing apparatus

2007-04-24

2007-04-24

Beatty, Robert (Department: 2852)

Electrophotography

Image formation

Development

C430S111400

Reexamination Certificate

active

11090282

ABSTRACT:
A developing apparatus including: a developer carrying member for carrying a developer, the developer carrying member being provided with an elastic layer and adapted to develop, with a developer, an electrostatic image formed on an image bearing member; wherein the developer includes a toner, the toner has a shape factor SF-1 of 100 or more but less than 130, the toner has a storage modulus G′ (140° C.) at 140° C. of 2.0×103dN/m2or more but less than 2.0×104dN/m2, the toner has a temperature, when the toner has a viscosity of 1.0×103Pa·s in a flow tester temperature elevation method, of 115° C. or more but less than 130° C., and, in a surface roughness of the developer carrying member, a center-line mean roughness Ra, a ten-point mean roughness Rz and a mean spacing Sm of irregularities satisfy following relationships (1):0.06≤Rz/Sm≤0.40.8≤Ra≤2.0⁢⁢(μ⁢⁢m)}.(1)

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