OBJECTIVE LENS WITH DISCRETE CHANGE OF FOCAL DISTANCE FOR NEAREST IR REGION OF SPECTRUM Russian patent published in 1997 - IPC

Abstract RU 2079154 C1

FIELD: optics. SUBSTANCE: proposed objective lens is related to special ones and is used to observe objects within spectrum region 0.6-1.0 μm. Objective lens includes four components. First and second components ensure maximum focal distance. In addition to first two components third and fourth components are brought in to ensure minimum focal distance. Aiming for distance is performed for both focal distances by movement of first component toward objective. EFFECT: improved functional stability and precision. 7 dwg

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RU 2 079 154 C1

Authors

Grishina L.I.

Bezdid'Ko S.N.

Dates

1997-05-10—Published

1994-06-15—Filed