| 摘要 |
FIELD: optics. ^ SUBSTANCE: device has hermetic body, inside of which focus ring with objective is placed, in groove of which a rod is placed, which two form a screw couple, lead magnet rigidly connected to focus ring and contacting inner end surface of body, drive magnet, mounted outside of body, coaxially with lead magnet and contacting outer surface of body, rotation handle rigidly fixed to driving magnet. In handle a limiter is fixed, made in form of rod and stop, placed at outer side of body at circular trajectory of rod displacement, while driving and lead magnets are provided with screens, placed on sides, opposite to their interaction sides. ^ EFFECT: higher reliability. ^ 1 dwg |
