| 摘要 |
The invention relates to a magnetic drive focusing device with at least one lens within a chamber and an adjuster with magnets outside the chamber. Positioned between the lens and the chamber is a second sleeve with helical guide paths. As the adjuster is moved outside the chamber, the magnetic field within the chamber causes the lens within the chamber to move. As the lens rotates, non-magnetic guides which ride in the helical guide paths force the lens to move axially within the device.
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