FAST LENS Russian patent published in 1998 - IPC

Abstract RU 2105333 C1

FIELD: lenses in night viewing devices. SUBSTANCE: the lens has three components, the last component is removed from the second component and fixed, focusing is effected by displacement of the first two components. In the variant of a four-component lens focusing is effected by displacement of the first three components. The thickness of the last components, its focal power, air gaps and lens focal length are interdependent. EFFECT: enhanced efficiency. 2 cl, 2 dwg

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RU 2 105 333 C1

Authors

Medvedev A.V.

Grinkevich A.V.

Dates

1998-02-20—Published

1995-02-13—Filed