| 摘要 |
PROBLEM TO BE SOLVED: To execute evaluation with high reliability by evaluating the sensitivity characteristic of a photoreceptor in the time of the same scale as the scale of a digital machine having a laser scan optical system. SOLUTION: An electrostatic charger 2, destaticizer 4, first surface electrometer 5 and second surface electrometer 6 arranged around the photoreceptor 1 are arbitrarily moved with respect to the electrophotoreceptor 1, by which the characteristics of the photoreceptor 1 are evaluated from the outside diameter of the electrophotoreceptor 1, the line speed of the photoreceptor, the resolution of a laser scan sub-scanning direction, electrostatic charge time, exposure time, the arrangement position information in the peripheral direction of the electrostatic charger 2 and the surface potentials of the photoreceptor 1 before and after exposure measured by the first surface electrometer 5 and the second surface electrometer 6. |
