POTENTIAL CHANGE MEASURING METHOD AND POTENTIAL CHANGE MEASURING DEVICE

摘要

PROBLEM TO BE SOLVED: To improve measurement spatial resolution in terms of a measuring method and measuring device in which a photoreceptor is exposed with a minute spot of light to cause a surface potential change in the minute area, a dielectric current is measured using the potential change, and the level of the surface potential before the exposure is determined from the magnitude of its signal.;SOLUTION: The photoreceptor drum K to be measured is charged with a charger 6, the surface of the photoreceptor drum K is exposed with a laser beam light source 2 so that a surface potential change is caused in the minute area. After the exposure, a dielectric current is detected with an electrode 8 near the surface of the photoreceptor drum K. The electrode 8 is disposed within a plane formed by incident light and the normal at the position where exposure incident light is made incident on the photoreceptor drum K and out of an angle formed by the incident angle and a specular reflection angle, and out of a plane formed by the incident light and the normal.;COPYRIGHT: (C)2006,JPO&NCIPI