ALEXANDRIA, Va., Aug. 20 -- United States Patent no. 12,392,998, issued on Aug. 19, was assigned to CANON K.K. (Tokyo).
"Optical system and image pickup apparatus" was invented by Mikio Kobayashi (Tochigi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical system includes first to third units. The first unit includes a first substrate and a first lens having negative refractive power. The first lens is disposed on the image side of the first substrate. The second unit includes a second substrate and a second lens having positive refractive power. The second lens is disposed on the object side or image side of the second substrate. The third unit includes a third substrate and a third lens having...