LOW MASS WARPAGE FREE EYEPIECE
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United States of America Patent
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N/A
Issued Date -
Oct 3, 2013
app pub date -
Mar 30, 2012
filing date -
Mar 30, 2012
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An eyepiece for a night vision goggle (NVG) system includes a first lens element axially aligned with second and third lens elements. The first, second and third lens elements are sequentially positioned between a viewer and an object formed on a screen surface. The first lens element is formed as a doublet having two cemented elements. The second lens element includes a convex surface facing the doublet and a concave surface facing toward the third lens element. The third lens element includes a first convex surface facing the second lens element and a second convex surface facing the object. The second lens element is formed with two even aspheric surfaces comprised of only even coefficients and is substantially uniform in thickness.
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