To increase the size and density of the irregularities of a rubber surface, to improve abrasion resistance by irradiating a specific ultraviolet ray to the surface of an elastic semicondutor layer composed of silicone rubber.
In a semiconductive roll, a non-foam elastic semiconductor layer 2a, composed of semiconductive silicone rubber, is formed on the outer peripheral surface of a conductive spindle body 1, and a surface treating layer 3 is formed on the layer 2a, by irradiating an ultraviolet ray, having a main frequency of 253.7nm and 184.9nm, by an integrating light quantity of 1.2-76J/cm2 uniformly by a low-pressure mercury lamp. The semiconductive roll displays a function such as the development of an electrostatic latent image, caused injecting an electric charge to a toner, and carrying the toner to an electrostatic latent image carrier; by earthing one end or both the ends of the spindle body 1, or applying bias voltage. Consequently, the abrasion resistance of the surface layer 3 can be improved, and also fine irregularities can be caused at a high density, to keep an excellent printing characteristic despite long time use.
OGUCHI SHUJI
IKEDA MASAHIRO
