| 摘要 |
<P>PROBLEM TO BE SOLVED: To avoid increase in the tilt of a rotation axis 24 of a rotary polygon mirror 16 in the lateral direction of the substrate of a light deflector 18. <P>SOLUTION: In a scanning optical device 2 with a light deflector 18 having insertion holes made in three parts of a substrate, while a fittable part 28b of a journal member 28 provided on the light deflector 18 is fitted in a fitting hole 43 of an optical box 13 and any screw fasteners have not been fastened, a screw 41a is fastened via an insertion hole 40a different from two insertion holes 40b and 40c furthest away from each other. At this time, the insertion hole 40a is arranged such that in the case where the fittable part 28b and an internal wall surface 45 of the fitting hole 43 are brought into contact with each other by torque acting on the light deflector 18 due to frictional force acting between the screw 41a and a substrate 35, the direction of reaction force f2 acting on a contact point K2 is more parallel to a straight line, which is parallel to a straight line connecting the two insertion holes rather than a straight line, which is perpendicular to the straight line parallel to the straight line connecting the two insertion holes. <P>COPYRIGHT: (C)2013,JPO&INPIT |
