Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Image forming apparatus providing an ideal contact pressure of a primary transfer unit
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,1.5T−40≦P≦1.5T+Aexpression 140≦T≦200expression 2where P is in g/cm2, T is in μm, and A=2,000R−1,800.
Ricoh Company, Ltd.
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Yoshida