Patent ID: 7298999

Claim:
An image forming apparatus, comprising: at least one image carrier that carries a toner image formed of toner according to image data; a transfer belt that is stretched over a plurality of rollers and pressed against the image carrier; at least one 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, wherein 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, 1.5 T −40 ≦P≦ 1.5 T+A expression 1 40 ≦T≦ 200 expression 2 where P is expressed in a unit of g/cm 2 , T is expressed in a unit of μm, and A=2,000R−1,800.