| 摘要 |
PURPOSE:To provide an optical scanning device without the irregularity of scanning pitch and the deviation of a scanning position by positioning plural optical elements so as to be symmetric about the rotary shaft. CONSTITUTION:Projections 141 for positioning in the direction of the rotary shaft at three places and projections 142 for positioning in the radial direction at two places are provided on the bottom surface of a lens mirror 14 and the plural lens mirrors 14 are positioned so as to be symmetric about the rotary shaft 131. Namely, in order to fix the lens mirrors in such a positioning direction, they are pushed against the directions of a positioning surface 134 in the direction of rotary shaft and a positioning surface 135 in the radial direction. The foot part of a fixing spring is engaged with the notch 136 for mounting the fixing spring of a supporting plate 132 and the lens mirrors 14 are pushed against the positioning surface 134 in the direction of rotary shaft by means of an arm part. The lens mirrors 14 are exerted by centrifugal force as a motor 130 rotates and, by being automatically pushed against the positioning surface 135 in the radial direction, they are fixed while being positioned. |
