Patent ID: 7135262

Claim:
A method of forming a toner image, comprising: electrically charging a photoreceptor containing an organic photosensitive material; imagewise exposing the photoreceptor so that a latent image is formed on the photoreceptor; developing the latent image with toner so that a toner image is formed on the photoreceptor by a reversal development; wherein the photoreceptor comprises a charge generation layer containing an N-type charge generation material, a charge transportation layer containing a charge transportation material and has a thickness of from 5 to 15 μm and an interlayer; the toner contains colored particles comprising a resin and a colorant, and the colored particles have a ratio, Dv 50 /Dp 50 , of the 50% volume particle diameter Dv 50 to the 50% number particle diameter Dp 50 of from 1.0 to 1.15 and a ratio, Dv 75/ Dp 75 , of an accumulate of 75% volume average particle diameter from larger particle side to an accumulate of 75% number average particle diameter from larger particle side of from 1.0 to 1.20, and content of colored particles having a diameter of 0.7×Dp 50 is not more than 10 in number; and the reversal development is performed under condition satisfying the following expression: 50≦|E|≦100 Expression 1 E: Electrical field intensity applied to the organic photoreceptor that is a quotient of potential V in an unexposed area of the photoreceptor at a time of development divided by layer thickness of total thickness of the interlayer, charge generation layer and the charge transportation layer of the photoreceptor in V/μm.