Patent ID: 8781366

Claim:
An image formation apparatus for forming an image comprising: a photoreceptor including a surface comprising a photosensitive layer; a charge unit configured to charge the surface of the photoreceptor; an exposure unit configured to emit light to the surface of the photoreceptor charged by the charge unit and to form an electrostatic latent image on the surface of the photoreceptor; a development unit configured to feed a developer to the electrostatic latent image and thereby develop a developer image on the surface of the photoreceptor; and a transfer unit configured to transfer the developer image onto a transfer target, wherein the photoreceptor satisfies both of the following formulae: 0.9≦(| V 0 (2)− VL |)/(| V 0 (1)− VL |)≦1.0, and 2.0≦| VL|/L≦ 3.5 where VL denotes a post-exposure surface potential value [V] of a surface portion of the photoreceptor exposed by the exposure unit in a first image formation cycle, V 0 ( 2 ) denotes a charge potential value [V] in a second image formation cycle of a surface portion of the photoreceptor exposed by the exposure unit in the first image formation cycle, V 0 ( 1 ) denotes a charge potential value [V] in a second image formation cycle of a surface portion of the photoreceptor not exposed by the exposure unit in the first image formation cycle, and L denotes a film thickness [μm] of the photosensitive layer.