| 摘要 |
PROBLEM TO BE SOLVED: To prevent optical components and bearings from deteriorating owing to the heat generation of a magnetic circuit. SOLUTION: A rotary shaft 23 is supported through bearings consisting of ball bearings fixed to a housing 21. On a pedestal 24 pressed and fixed onto the rotary shaft 23, a polygon mirror 25 is fixed with a stopper 26. A permanent magnet 26 is fixed to the rotary shaft 23 with an adhesive on the opposite side of the rotary shaft 23 from the fitting side of the polygon mirror 25, and at the outer peripheral part of the permanent magnet 26, a stator coil 28 wound with a coil 27 is arranged. Then a substrate 30 fitted with an electric component 29 is fixed to the stator core 28 by adhesion, screwing, etc. Consequently, the coil 27 as a heat generating source can be isolated from the bearings and polygon mirror 25 to eliminate the influence of heat on the bearing life and obstruct the life of the reflecting film of the polygon mirror 25 from becoming short. |
