ALEXANDRIA, Va., March 3 -- United States Patent no. 12,566,321, issued on March 3, was assigned to LG INNOTEK Co. LTD. (Seoul, South Korea).

"Optical system and camera module including same" was invented by Ju Yong Shim (Seoul, South Korea) and Tae Kyung Kim (Seoul, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "A zoom optical system according to an embodiment of the present invention includes a first lens group, a second lens group, a third lens group, and a fourth lens group which are sequentially arranged in a direction from a subject side to an image side, wherein the second lens group and the third lens group are movable, and an effective focal length (EFL) in a telephoto mode is defined by...