| 摘要 |
A coarse and fine adjustment focusing apparatus secured to a microscope body for moving a movable member includes a sun gear secured to a fine adjustment knob shaft, an internal gear unrotatably provided on the same axis as the fine adjustment knob shaft, a first planetary gear meshing with both the sun gear and the internal gear, a second planetary gear being equal in the number of teeth and module to the first planetary gear and disposed on the same shaft as the first planetary gear and meshing with the sun gear, a first resilient number for imparting rotational forces in opposite directions to the first planetary gear and the second planetary gear, a third planetary gear being equal in the number of teeth and module to the first planetary gear and disposed on the same shaft as the first planetary gear and meshing with the internal gear, a second resilient member for imparting rotational forces in opposite directions to the first planetary gear and the third planetary gear, and a power transmitting shaft to which is secured a rotary shaft for rotatably supporting the first, second and third planetary gears and which is rotatable on the same axis as the fine adjustment knob shaft, the power transmitting shaft having a pinion for moving the movable member.
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