US Patent Issued to SEIKO EPSON on Oct. 6 for "Projection optical system and projector" (Japanese Inventor)

ALEXANDRIA, Va., Oct. 6 -- United States Patent no. 12,754,405, issued on Oct. 6, was assigned to SEIKO EPSON Corp. (Tokyo).

"Projection optical system and projector" was invented by Akihisa Kageyama (Matsumoto, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A projection optical system includes first through ninth lens groups, and these lens groups are in an order from a magnification side to a reduction side. The projection optical system includes an aperture stop between the second lens group and the eighth lens group. The first lens group has negative power and includes one first aspherical lens. Any one of the second, the third, the fourth, the fifth, the sixth, the seventh, the eighth, and the nin...