US 11,982,806 B2
Optical system with adjustable eye relief
Stan Szapiel, Midland (CA); and Stefan Atalick, Midland (CA)
Assigned to RAYTHEON CANADA LIMITED, Ottawa (CA)
Filed by RAYTHEON CANADA LIMITED, Ottawa (CA)
Filed on Jun. 24, 2022, as Appl. No. 17/848,585.
Claims priority of provisional application 63/217,413, filed on Jul. 1, 2021.
Prior Publication US 2023/0004000 A1, Jan. 5, 2023
Int. Cl. G02B 27/00 (2006.01); G02B 13/00 (2006.01); G02B 25/00 (2006.01); G02B 27/30 (2006.01)
CPC G02B 27/0081 (2013.01) [G02B 13/0095 (2013.01); G02B 25/001 (2013.01); G02B 27/30 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical system with adjustable eye relief comprising:
a relay lens assembly defined by a collimating lens and a focusing lens;
an aperture stop configured to shift axially along an optical axis between the collimating lens and the focusing lens; and
an afocal lens assembly defined by the focusing lens and an eyepiece,
wherein an axial shift of the aperture stop along the optical axis between the collimating lens and the focusing lens changes an eye relief of the eyepiece based on a transverse magnification of the afocal lens assembly.