Optical: systems and elements – Compound lens system – Telescope
Patent
1998-01-21
1999-12-21
Nguyen, Thong
Optical: systems and elements
Compound lens system
Telescope
359399, 359425, G02B 2300
Patent
active
060057114
ABSTRACT:
A variable optical power telescopic sight with adjustable focus control includes a tubular housing having a longitudinal axis, an interior and exterior, and first and second ends. The housing holds an eyepiece positioned at the second end and an erector positioned in the interior of the housing medially of the first end and the eyepiece. To enable side focus control in the telescopic sight, an objective lens system includes a stationary portion positioned in the interior of the housing near the first end and a movable portion positioned in the interior of the housing between the stationary portion and the erector for movement generally along the longitudinal axis to adjust the focus of the telescopic sight. A manually adjustable focus control device projects outwardly from the exterior of the housing in a direction transverse to the longitudinal axis and is connected to the movable portion of the objective lens system. The side mounted focus control device allows a marksman to change the position of the movable portion of the objective lens along the longitudinal axis to adjust the focus of the telescopic sight. A slidable lens carrier, positioned within the housing and coupled to the focus control device, holds the movable portion of the objective lens system for movement along the longitudinal axis of the housing. In an alternative embodiment, the movable portion of the objective lens system is operably connected to a pivotable erector lens system for increasing a windage and holdover adjustment of the telescopic sight.
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Mai Neil T.
Thomas Mark A.
Leupold & Stevens, Inc.
Nguyen Thong
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