| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a density sensor capable of effectively preventing toner or the like from sticking thereto, and also, achieving the cost reduction, and to provide an image forming apparatus. <P>SOLUTION: Regarding the image forming apparatus 1, in the case of detecting the density of a toner image as a reference patch A formed on the surface of a primary transfer belt 40 by the density sensor 83, an electric field having the same polarity as that of the toner is generated on the surface facing the primary transfer belt 40, of the density sensor 83, then, Coulomb force is generated in the toner constituting the toner image and scattering from the surface of the primary transfer belt 40, then, the toner is repelled to move away from a thin film member 83c. Consequently, the toner is prevented from sticking to the density sensor 83, and the density is accurately detected. <P>COPYRIGHT: (C)2009,JPO&INPIT |
