Patent ID: 7403735

Claim:
An image formation apparatus comprising; a photoconductor, a charging means for charging a surface of the photoconductor at a desired electric potential, a light-writing means for performing light-writing having a resolution of equal to or more than 1200 dpi using a laser light beam with a beam diameter of equal to or less than 25 μm to form a latent image on the surface of the photoconductor, and said light writing being performed based on image data obtained by applying a halftone processing at a line frequency of equal to or more than 200 lpi to an input image, wherein said photoconductor comprises a conductive support, a charge generating layer comprising a charge generating material, and a charge transfer layer comprising a charge transfer material, said charge generating layer and said charge transfer layer being laminated on said conductive support, and the ionization potential of said charge generating material Ip(CG) and the ionization potential of said charge transfer material Ip(CT) satisfy relationship (I); Ip ( CG )≧ Ip ( CT ) (I), said light-writing is performed based on image data formed by applying said halftone processing to said input image, wherein said charge transfer material is selected from the group consisting of said charge generating material is selected from the group consisting of wherein the photoconductor provides an image quality tone of 0.980 or greater.