ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,455,437, issued on Oct. 28, was assigned to SEIKO EPSON Corp. (Tokyo).
"Optical system and projector" was invented by Eiji Morikuni (Matsumoto, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical system includes a first optical system having a first optical element, and a second optical system arranged at a reduction side of the first optical system. An intermediate image is formed between the first optical system and the second optical system. The first optical element has a first reflecting surface having a concave shape. The second optical system has a first relay element, a second relay element arranged at an enlargement side of the firs...