POLYGON SCANNER, OPTICAL SCANNER USING THE POLYGON SCANNER, AND PROCESSING METHOD FOR THE POLYGON SCANNER

摘要

PPROBLEM TO BE SOLVED: To provide a polygon scanner which can be rotated with small vibration even at high temperature and can cope with both electric power saving and facilitation of assembly and its processing method. PSOLUTION: A rotary member 8 of the polygon scanner 1 is characterized by that polygon mirror reflecting surfaces 8a and 8b which are separated along the axis, a circumferential surface where a rotor magnet 11 of an outer rotor motor is fixed, and a circumferential surface where a bearing shaft 10 is fixed are formed of a single member. The rotary member 8 has circumferential grooves 8h, 8i, and 8k and used as an adhesive coating part for prevention against stress strain to reflecting surfaces 8a and 8b and balance correction occurring in shrinkage fit of the bearing shaft 10 and caused by environmental temperature variation. The polygon mirror reflecting surfaces 8a and 8b has its nearly center part shaped so that top and reverse surfaces are nearly concave or convex to both the ends of a part contributing deflection in a horizontal scanning direction, thereby suppressing slurring of respective colors of a color image forming apparatus in the horizontal scanning direction. PCOPYRIGHT: (C)2003,JPO