Method and apparatus of developing a latent image formed on...

Details Method and apparatus of developing a latent image formed on... Method and apparatus of developing a latent image formed on...

2006-04-25

2006-04-25

Beatty, Robert (Department: 2852)

Electrophotography

Image formation

Development

Reexamination Certificate

active

07035576

ABSTRACT:
In a magnet brush type image developing method of the present invention, at least one position where brush chains formed by magnetic carrier grains rise exists in a portion where an electric field formed between a facing zone where an image carrier and a developer carrier face each other has a strength E(V/m) expressed as:E≥(A·ρT·d·R)(3⁢B12·ɛ0·VSL)where B is representative of Tc·D3·ρc/(100−Tc)·d3·ρT, A denotes a mean amount of charge (C/kg) deposited on the toner grains Tcdenotes the content of toner grains (wt %), d denotes the mean grain size (m) of the toner grains, D denotes the mean grain size (m) of the magnetic carrier grains, ρTdenotes the specific weight (kg/m3) of the toner grains, ρcdenotes the specific gravity (kg/m3) of the carrier grains, εois 8.854×10−12(F/m), R denotes the diameter of the developer carrier, and VSLdenotes the linear velocity of the developer carrier.

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