| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming apparatus that carries out an image density adjustment stably while preventing the detection function of an optical sensor from being damaged due to the action failure of an optical path blocking member and suppressing the enlargement in size and a price rise. SOLUTION: The image forming apparatus which records a toner image formed on an image carrier 2 and carries out printing has an openable/closable light path blocking member 17 which shields the light path of an optical sensor 16 arranged at the upper side of an intermediate transfer member 7 and which interrupts the light path at an arbitrary timing; and a light path blocking member opening and closing action means 18 which moves the light path blocking member 17 between the unblocking position and a blocking position. In the condition where the light path blocking member 17 is in the blocking state and the light path is shielded, the output of the optical sensor 16 is detected and whether the opening and closing action of the light path blocking member 17 is normal is determined according to the detection results. COPYRIGHT: (C)2009,JPO&INPIT
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