| 摘要 |
In a lens system including a thermal compensation mechanism that compensates for unwanted positional shifts between two tenses in the lens system resulting from changes in a temperature of the lens system, a bias mechanism is provided to bias elements of the lens system together. The bias force exerted by the bias mechanism on the thermal compensation mechanism insulates the lenses from effects of a dynamic environment, and ensures that a distance between the lenses along the optical axis will change with temperature of the lens system to provide necessary compensation. In an exemplary embodiment, the bias mechanism is a cylinder with a helical cut along its length that laterally surrounds a portion of the compensation mechanism, and provides a bias force in a direction parallel to the optical axis to urge angled interfaces of the compensation mechanism into abutment.
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