US 11,921,284 B2
Optical zoom system using an adjustable reflective fresnel lens implemented with a micro-electro-mechanical system (MEMs) micro-mirror array (MMA)
Eric Rogala, Tucson, AZ (US); Gerald P. Uyeno, Tucson, AZ (US); and Sean D. Keller, Tucson, AZ (US)
Assigned to Raytheon Company, Tewksbury, MA (US)
Filed by Raytheon Company, Waltham, MA (US)
Filed on Mar. 19, 2021, as Appl. No. 17/207,177.
Prior Publication US 2022/0299756 A1, Sep. 22, 2022
Int. Cl. G02B 26/08 (2006.01); G02B 3/08 (2006.01); G02B 7/182 (2021.01); G02B 17/00 (2006.01)
CPC G02B 26/0841 (2013.01) [G02B 3/08 (2013.01); G02B 7/182 (2013.01); G02B 17/002 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A zoom system, comprising:
a collection optic having a first focal length f1, said collection optic configured to collect a beam of light; and
a reflective Fresnel Lens having a second variable focal length f2 configured to alter a width of the beam of light,
said reflective Fresnel Lens comprising a Micro-Electro-Mechanical System (MEMS) Micro-Mirror Array (MMA) including a plurality of mirrors, said MFMS MMA responsive to command signals to tip, tilt and piston the mirrors in three degree-of-freedom (DOF) to form a center region surrounded by a plurality of concentric rings whose reflective surfaces as formed by the mirrors approximate respective curvatures to focus light at a common focal point to set the second variable focal length f2.