ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,535,650, issued on Jan. 27, was assigned to CANON K.K. (Tokyo).
"Optical system and image pickup apparatus having the same" was invented by Takeo Mori (Tochigi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical system includes, in order from an object side to an image side, a front group, an aperture stop, and a rear group that has positive refractive power as a whole. The front group includes a first lens having negative refractive power disposed closest to an object. The rear group includes a final lens having positive refractive power disposed closest to an image plane. The optical system includes four or more lenses disposed between th...