Patent ID: 7127196

Claim:
An image forming apparatus comprising: a photoreceptor comprising, an electroconductive substrate, and a photosensitive layer located overlying the electroconductive substrate and comprising a charge generation material, a charge transport material and an inorganic filler such that the photosensitive layer is a single mixture photosensitive layer that comprises the charge generation material, the charge transport material and the inorganic filler and the inorganic filler has a gradient-like concentration with a highest concentration at a surface side of the photosensitive layer farthest from said electroconductive substrate and a lowest concentration at a bottom side of the photosensitive layer near the electroconductive substrate, wherein an outermost layer of the photoreceptor has a water vapor permeability not greater than 50 g·m −2 ·24 h −1 , wherein the photosensitive layer is the outermost layer, and wherein the single mixture photosensitive layer has a thickness of from 5 μm to 50 μm; a charger configured to charge the photoreceptor; an image irradiator configured to irradiate the photoreceptor with imagewise light to form an electrostatic latent image on the photoreceptor; an image developer configured to develop the electrostatic latent image with a developer including a toner to form a toner image on the photoreceptor; and an image transfer device configured to transfer the toner image onto a receiving material.