Fresnel lens with aspiteric grooves
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United States of America Patent
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-
Nov 29, 1988
Grant Date -
N/A
app pub date -
Apr 10, 1986
filing date -
Apr 10, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A Fresnel lens formed of an infrared transmitting material has a grooved surface. The grooves all extend to the same depth, and the distances between successive grooves vary across the lens. In a circular lens, the grooves are concentric, and the distances between grooves nearer the center are longer than the distances between the grooves nearer the circumference. A substantial portion of the grooves have an aspherical surface.
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Cited Art Landscape
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