Passively Athermalized FF Lens
A military flight application requiring a fixed focus lens with no moving parts.
The desired lens must focus from a relatively-close 3 feet to infinity with no mechanical focus adjustment, while having a wide (+160°) field of view and athermal over a temperature range from 50°F to 122°F.
|Durability:||The lens had a very durable and ruggedized design.|
|Innovation::||No motors, power, or moving parts are used with the lens; the system is completely passive.|
|Design:||All materials used in the design have a normal coefficient of thermal expansion (CTE), but the design was able to accommodate in temperature shifts (both optically and mechanically). The lens stays in focus over the entire thermal range.|
|Compact:||The finished lens measured only 2.5” Dia. X 2.2” Length.|
|Lightweight:||The finished lens only weighed 12 ounces.|
|Production:||irZoom now offers this lens as a standard, off-the-shelf solution (used with a Tau 640 camera).|