| 摘要 |
PURPOSE:To almost completely seal a rotary body and to suppress the infiltration of an unnecessary material into a frame by attaching a rotary polygon mirror, a magnet, a thrust direction bearing mechanism on the outer periphery of a rotary shaft and sealing hermetically and storing the rotary body pivoted around a dynamic pressure shaft supporting mechanism so as to be optionally rotated into a hollow formed by a frame. CONSTITUTION:A side frame 3 is bent like an L shape at a cross section so as to be interposed between the magnet 10 disposed on the outer periphery of a rotary shaft 6 and a stator H provided with a coil H opposed to the magnet 10 and the magnet 10, a thrust receiver 12 and the thrust bearing 13 are surrounded by the L-shaped frame. A stator fixing board 21 having an L-shaped cross section is fixed to the outside, i.e. a lower frame 2, of the bent part with L-shaped cross section and the stator 11 provided with the coil H and a base 15 mounting a hole element 16 are mounted to a stator fixing board 21 with an L-shaped cross section. Consequently, the rotary body R is spatially separated from the stator 11 and the rotary body R is completely and hermetically sealed and stored in the hollow formed by frame groups 1 to 3, the infiltration of unnecessary materials such as dust can be suppressed. |
