Patent ID: 7764888
Filing Date: 2010-07-27
Classification: G03G

Abstract:
1. An image formation apparatus comprising: a photoconductor that comprises a photoconductive layer having a surface on which an electrostatic latent image is formed; a charging roll to which a bias with an AC component superposed on a DC component is applied for charging the photoconductor at a predetermined potential; a film thickness detector that detects a film thickness of the photoconductive layer of the photoconductor without applying the AC component; an environment measuring section that measures at least one of ambient temperature and humidity; an AC component setting section that sets a value of the AC component of the bias based on detection results of the film thickness detector and the environment measuring section; and a charging controller that controls the voltage or current applied to the charging roll based on the value of the AC component set by the AC component setting section; wherein the AC component setting section sets the AC component of the bias based on the product of a value of the film thickness detected by the film thickness detector to the (−½)th power and an environmental compensation coefficient based on at least one of an ambient temperature and humidity measured by the environment measuring section.