ALEXANDRIA, Va., July 15 -- United States Patent no. 12,663,620, issued on June 23, was assigned to Raytheon Co. (Arlington, Va.).
"Compact tri-band infrared afocal telescope" was invented by Lan Sun (Allen, Texas).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical system includes an external common entrance pupil, a front multispectral objective lens group configured to receive and direct electromagnetic radiation in the multispectral infrared wavelengths, and a first beamsplitter configured to receive electromagnetic radiation from the front objective lens group. The first beamsplitter further is configured to reflect electromagnetic radiation in the short wave infrared (SWIR) wavelength and the midd...