Patent ID: 8175474
Filing Date: 2012-05-08
Classification: G03G

Abstract:
1. An image forming apparatus that forms a toner image on an endless belt driven by a driving roller, the apparatus comprising: a detector that detects light from the endless belt or the toner image formed on the endless belt; a determination unit that determines whether a foreign substance is adhered to the driving roller; a decision unit that, in the case where said determination unit determines that the foreign substance is adhered, decides a moving amount of a surface of the endless belt when the driving roller rotates once by a first decision method deciding the moving amount and corresponding to a case wherein the foreign substance is adhered, and in the case where said determination unit determines that no foreign substance is adhered, decides the moving amount by a second decision method deciding the moving amount and corresponding to a case wherein no foreign substance is adhered; and a calculator that calculates a dynamic characteristic of the image forming apparatus based on a detection result of said detector that complies with the moving amount decided by said decision unit according to the first decision method or the second decision method.