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    • 3. 发明授权
    • Image forming apparatus
    • 图像形成装置
    • US07912389B2
    • 2011-03-22
    • US12022575
    • 2008-01-30
    • Takeshi YamamotoManami HaraguchiKenta KuboYoshinobu BabaKoh Ishigami
    • Takeshi YamamotoManami HaraguchiKenta KuboYoshinobu BabaKoh Ishigami
    • G03G15/08
    • G03G15/065G03G5/04G03G15/0806G03G15/5037G03G15/5062G03G2215/00037G03G2215/0607
    • An image forming apparatus, wherein the following formulae are satisfied: 0.22 ≤ ( M / S ) L ≤ 0.4 , ⁢ ( Q M ) L = Vc ( Lt 2 ⁢ ɛ 0 ⁢ ɛ t + Ld ɛ 0 ⁢ ɛ d ) × ( M S ) L ( Dt ⁢ ⁢ max - Dt 0.1 ) { λ × ( M S ) L - 0.1 } ⁢ ( Lt 2 ⁢ ɛ 0 ⁢ ɛ t + Ld ɛ 0 ⁢ ɛ d ) × ( M S ) L 500 ≤ αβ ≤ ( Dt ⁢ ⁢ max - Dt 0.1 ) { λ × ( M S ) L - 0.1 } ⁢ ( Lt 2 ⁢ ɛ 0 ⁢ ɛ t + Ld ɛ 0 ⁢ ɛ d ) × ( M S ) L 150 αβ ≥ ( Dt ⁢ ⁢ max - Dt 0.1 ) { λ × ( M S ) L - 0.1 } 150 where (M/S)L: a toner bearing amount in a maximum density image portion of a photosensitive drum, (Q/M)L: an average charge amount of the toner in the maximum density portion, Vc: an absolute value of a potential difference between a DC-component of a developing bias and the maximum density portion, Lt: a toner layer thickness of the maximum density portion, Ld: a drum thickness, εt: a relative permittivity of the toner layer, εd: a relative permittivity of the drum, ε0: a vacuum permittivity, Dtmax: a transmission density in a maximum density image portion on the paper after fixation, Dt0.1: a transmission density in an image on the paper when the toner bearing amount on the paper after fixation is 0.1 mg/cm2, and λ: a transfer efficiency of the toner, α = ( Dt ⁢ ⁢ max - Dt 0.1 ) { λ × ( M S ) L - 0.1 } , ⁢ and ⁢ ⁢ β = 1 / ( Q / M ) L .
    • 图像形成装置,其中满足以下公式:0.22≤(M / S)L≤0.4,(QM)L = Vc(Lt2ε0εt + Ldεεεε)×(MS )L(Dt·最大 - Dt 0.1){λ×(MS)L-0.1}(Lt2ε0εt + Ldε0εd)×(MS)L 500≤α&bgr; ≤(Dt·最大 - Dt 0.1){λ×(M S)L -0.1}(Lt2ε0εt + Ld∈0εd)×(M S)L 150α&bgr; ≥(Dt·最大 - Dt 0.1){λ×(MS)L-0.1} 150其中(M / S)L:感光鼓的最大浓度图像部分中的调色剂承载量(Q / M)L :最大密度部分中的调色剂的平均电荷量,Vc:显影偏压的DC分量与最大浓度部分之间的电位差的绝对值,Lt:最大密度部分的调色剂层厚度, Ld:鼓厚度,t:调色剂层的相对介电常数,e:鼓的相对介电常数; e:真空介电常数Dtmax:最大密度图像部分的透射密度 固定后的纸张,Dt0.1:固定后纸张上的调色剂承载量为0.1mg / cm 2时在纸张上的图像中的透射密度,λ:调色剂的转印效率,α=(Dt + max - Dt 0.1){λ×(MS)L-0.1},和ü&bgr; = 1 /(Q / M)L。