ALEXANDRIA, Va., Aug. 18 -- United States Patent no. 12,710,629, issued on Aug. 18.
"Multiple effective focal length (EFL) optical system" was invented by Matthew A. Sinclair (Stoneham, Mass.) and Juha-Pekka Laine (Boston).
According to the abstract* released by the U.S. Patent & Trademark Office: "A multi-band/multi-polarization reflective or catadioptric optical system yields differing effective focal lengths (EFLs) per band/polarization. This approach could be used to create an imaging system, for example. In such case, a sensor (imager, spectrometer, diode, etc.) is located at the one or more focal planes. On the other hand, it could also be used to create a projecting system or hybrid projecting and imaging system by locating an emit...