US Patent Issued to SEIKO EPSON on Aug. 25 for "Optical member, virtual image display device, and measurement method for optical member" (Japanese Inventors)

ALEXANDRIA, Va., Aug. 25 -- United States Patent no. 12,717,140, issued on Aug. 25, was assigned to SEIKO EPSON Corp. (Tokyo).

"Optical member, virtual image display device, and measurement method for optical member" was invented by Toshiaki Miyao (Chino, Japan), Toshiyuki Noguchi (Shiojiri, Japan) and Mitsutaka Ide (Shiojiri, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical member includes a plurality of optically effective surfaces, and a plurality of measurement reference members that are associated with the plurality of optically effective surfaces and each of which serves as a reference for positioning of the plurality of optically effective surfaces. In this case, a relative positional r...