| 摘要 |
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: <maths id="MATH-US-00001" num="00001"> <MATH OVERFLOW="SCROLL"> <MROW> <MI>E</MI> <MO>>=</MO> <MROW> <MO></MO> <MFRAC> <MROW> <MO>(</MO> <MROW> <MI>A</MI> <MO>.</MO> <MSUB> <MI>rho</MI> <MI>T</MI> </MSUB> <MO>.</MO> <MI>d</MI> <MO>.</MO> <MI>R</MI> </MROW> <MO>)</MO> </MROW> <MROW> <MO>(</MO> <MROW> <MN>3</MN> <MO></MO> <MROW> <MSUP> <MI>B</MI> <MFRAC> <MN>1</MN> <MN>2</MN> </MFRAC> </MSUP> <MO>.</MO> <MSUB> <MI>ɛ</MI> <MN>0</MN> </MSUB> <MO>.</MO> <MSUB> <MI>V</MI> <MI>SL</MI> </MSUB> </MROW> </MROW> <MO>)</MO> </MROW> </MFRAC> <MO></MO> </MROW> </MROW> </MATH> </MATHS> where B is representative of T<SUB>c</SUB>.D<SUP>3</SUP>.rho<SUB>c</SUB>/(100-T<SUB>c</SUB>).d<SUP>3</SUP>.rho<SUB>T</SUB>, A denotes a mean amount of charge (C/kg) deposited on the toner grains T<SUB>c</SUB>denotes 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, rho<SUB>T </SUB>denotes the specific weight (kg/m<SUP>3</SUP>) of the toner grains, rho<SUB>c </SUB>denotes the specific gravity (kg/m<SUP>3</SUP>) of the carrier grains, epsilon<SUB>o </SUB>is 8.854x10<SUP>-12 </SUP>(F/m), R denotes the diameter of the developer carrier, and V<SUB>SL </SUB>denotes the linear velocity of the developer carrier.
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