Image forming apparatus providing an ideal contact pressure...

Details Image forming apparatus providing an ideal contact pressure... Image forming apparatus providing an ideal contact pressure...

2007-11-20

2007-11-20

Grainger, Quana (Department: 2852)

Electrophotography

Image formation

Transfer

C399S308000

Reexamination Certificate

active

11265174

ABSTRACT:
An image forming apparatus includes an image carrier that carries a toner image formed of toner, a transfer belt, a primary transfer unit that transfers the toner image from the image carrier to the transfer belt, and a secondary transfer unit that transfers the toner image from the transfer belt to a recording medium. A contact pressure P of the primary transfer unit, a thickness T of the transfer belt, and an average roundness R of the toner satisfy expression 1, and the thickness T of the transfer belt satisfies expression 2, a Young's modulus of the transfer belt being 2,500 MPa or more and 5,000 MPa or less,in-line-formulae description="In-line Formulae" end="lead"?1.5T−40≦P≦1.5T+Aexpression 1in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?40≦T≦200expression 2in-line-formulae description="In-line Formulae" end="tail"?where P is in g/cm2, T is in μm, and A=2,000R−1,800.

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