Flat field eyepiece
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United States of America Patent
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Sep 28, 2010
Grant Date -
May 27, 2010
app pub date -
Nov 25, 2008
filing date -
Nov 25, 2008
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lens system includes a first lens axially aligned with a second lens, where the first and second lenses are configured to be sequentially positioned from a pupil image of a viewer. The second lens is formed as a triplet having three cemented elements. The second lens includes a convex surface facing the first lens, and a flat surface opposing the convex surface of the second lens. The first lens includes a concave surface opposing a flat surface of the first lens; the second lens includes a concave surface and a convex surface; and the concave surface of the first lens and the concave and convex surfaces of the second lens have equal radii of curvatures.
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