| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrophotographic apparatus and a method of detecting opening or closing of a cover of the apparatus capable of preventing various troubles caused by an incompletely closed state of a door by detecting the incompletely closed state of the door by the toner density detection sensor or a registration sensor. SOLUTION: A toner density detection sensor 23 for detecting a toner image formed on an image carrier 1 by a development unit 4 is provided. The toner density detection sensor 23 is arranged at the door 20 for opening and closing the neighborhood of the image carrier 1 and detects the toner image on the image carrier 1 in a state where the door 20 is closed. A density detection value detected by the toner density detection sensor 23 before the door 20 is opened and a density detection value detected by the toner density sensor 23 after the door 20 is opened and closed are compared with each other, and determination is made on the basis of a difference between the detection values about whether or not the closed position of the door after the opening and closing operations of the door is in a regular closing position. In stead of the toner density sensor 23, the registration sensor can also be used to discriminating the closed position of the door. |
