Image forming apparatus

Details Image forming apparatus Image forming apparatus

2011-03-22

2011-03-22

Gray, David M (Department: 2852)

Electrophotography

Control of electrophotography process

Control of developing

C399S285000

Reexamination Certificate

active

07912389

ABSTRACT:
An image forming apparatus, wherein the following formulae are satisfied:0.22≤(M/S)L≤0.4,⁢(QM)L=Vc(Lt2⁢ɛ0⁢ɛt+Ldɛ0⁢ɛd)×(MS)L(Dt⁢⁢max-Dt0.1){λ×(MS)L-0.1}⁢(Lt2⁢ɛ0⁢ɛt+Ldɛ0⁢ɛd)×(MS)L500≤αβ≤(Dt⁢⁢max-Dt0.1){λ×(MS)L-0.1}⁢(Lt2⁢ɛ0⁢ɛt+Ldɛ0⁢ɛd)×(MS)L150αβ≥(Dt⁢⁢max-Dt0.1){λ×(MS)L-0.1}150where (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-Dt0.1){λ×(MS)L-0.1},⁢and⁢⁢β=1/(Q/M)L.

REFERENCES:
patent: 2005/0089340 (2005-04-01), Yamamoto
patent: 2005/0142478 (2005-06-01), Matsumura et al.
patent: 2007/0071473 (2007-03-01), Haraguchi et al.
patent: 2005-195674 (2005-07-01), None

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