US Patent Issued to Envisics on June 3 for "Pupil expansion" (British Inventor)

ALEXANDRIA, Va., June 4 -- United States Patent no. 12,320,976, issued on June 3, was assigned to Envisics Ltd (Milton Keynes, Great Britain).

"Pupil expansion" was invented by Jamieson Christmas (Milton Keynes, Great Britain).

According to the abstract* released by the U.S. Patent & Trademark Office: "There is disclosed herein a waveguide including an optical slab and an optical wedge. The optical slab has a first refractive index, n1less than1. The optical slab includes: a pair of opposing surfaces and an input port. The pair of opposing surfaces are arranged in a parallel configuration. The input port is arranged to receive light into the optical slab at an angle such that the light is guided between the first and second opposing surfa...