| 摘要 |
PURPOSE:To prevent a bend of a scanning line of an optical scanner and ununiformity of a pitch between the scanning lines, and to record a distinct image by holding a long-sized optical path deviation correction cylindrical lens in a part of a member for supporting a photosensitive drum. CONSTITUTION:As for a photosensitive drum 14, axial parts 18 of both ends are fitted into bearing recessed parts 21 provided on both wall parts 20 of a main body frame 19 of a printer and brought to bearing horizontally. Between both the wall parts 20 of the main body frame 19, a horizontal plate 23 used as a cover plate of a housing of an optical unit, as well is racked and provided. On the upper face of the horizontal plate 23, a long-sized window frame 25 having a slit 24 is provided projectingly, and an optical path deviation correction cylindrical lens 16 is fitted into this window frame 25 and fixed. Accordingly, the cylindrical lens 16 is position with high accuracy in the lower prescribed position of the photosensitive drum 14, and the parallelism is held. In such a way, a bend of a scanning line of an optical scanner and ununiformity of a pitch between the scanning lines can be prevented, and a distinct image is recorded. |
