| 摘要 |
PROBLEM TO BE SOLVED: To prevent the hands and fingers of an operator from touching and staining the reflecting surface of a return mirror when the operator replaces a process cartridge or handles a jam. SOLUTION: Nearby the return mirror 21, a protection plate 47 (protection member) is arranged which has a hole for passing at least either of the laser beam made incident on the return mirror 21 and the laser beam reflected by the return mirror 21 without shielding the optical path of the light beam L. |
