US 11,733,497 B2
Athermalized infrared telephoto camera lens for tracking cameras
Kevin W. Peters, Merrimack, NH (US); Gerard J. Pelletier, Amherst, NH (US); and David E. Thompson, Nashua, NH (US)
Assigned to BAE Systems Information and Electronic Systems Integration Inc., Nashua, NH (US)
Filed by BAE SYSTEMS Information and Electronic Systems Integration Inc., Nashua, NH (US)
Filed on Nov. 30, 2021, as Appl. No. 17/538,467.
Prior Publication US 2023/0168474 A1, Jun. 1, 2023
Int. Cl. G02B 13/14 (2006.01); H01L 27/146 (2006.01); G02B 13/02 (2006.01)
CPC G02B 13/14 (2013.01) [G02B 13/02 (2013.01); H01L 27/14627 (2013.01); H01L 27/14649 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An athermalized Short-Wave InfraRed (SWIR) telephoto lens device for a tracking camera comprising, in order, from a remote object to an image plane:
an Aperture Stop (AS);
a first optical element having a first element first surface radius of 23.16 to 23.24 mm convex, and a first element second surface radius of 46.21 to 46.29 mm concave;
a second optical element having a second element first surface radius of 22.68 to 22.76 mm convex, and a second element second surface radius of 46.21 to 46.29 mm concave; and
a third optical element having a third element first surface radius of −56.81 to −56.89 mm concave, and a third element second surface radius of 16.61 to 16.69 mm concave; and
a housing to hold at least said first, second, and third optical elements comprising a material having a Coefficient of Thermal Expansion (CTE) of about 8.8 ppm/K at room temperature;
whereby an image is formed.