| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure which effectively absorbs stress caused in the fitted part of a polygon mirror and a rotor boss which are shrink-fitted in a polygon mirror scanner motor used for a laser scanning of such a copy machine as a laser beam printer or a laser beam copy machine. SOLUTION: The rotor boss 2 and the mirror 3 both have a fitting interference, the mirror 3 is heated to be expanded and inserted into the rotor boss 2 to be shrink fitted. In this case, stress is generated in the fitted part 4 due to the fitting interference, but the fitting part 4 is easily elastically deformed by providing flutes 3c at the central hole part of the polygon mirror. Thus, the influence of the stress at the fitted part 4 to the strain of the whole mirror is prevented and the strain of a mirror face 3a which affects laser scanning accuracy is effectively reduced. Further, the strain of the whole mirror is more effectively suppressed by providing the flutes 3c to be located at the edge part 3b between mirror faces. COPYRIGHT: (C)2006,JPO&NCIPI |
