ALEXANDRIA, Va., July 7 -- United States Patent no. 12,674,978, issued on July 7, was assigned to CANON K.K. (Tokyo).
"Optical system and display apparatus" was invented by Yuma Kobayashi (Tochigi, Japan) and Yu Miyajima (Tochigi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical system through which a light beam from an image display element is guided to an exit pupil includes first and second transmissive reflective surfaces, and first and second optical elements. The first optical element includes a first optical part made of a first optical material, and a second optical part made of a second optical material different from the first optical material that are disposed in order from the exit...