US 12,379,578 B2
Optical system and camera module including same
Ju Yong Shim, Seoul (KR); and Tae Kyung Kim, Seoul (KR)
Assigned to LG INNOTEK CO., LTD., Seoul (KR)
Appl. No. 17/915,962
Filed by LG INNOTEK CO., LTD., Seoul (KR)
PCT Filed Mar. 30, 2021, PCT No. PCT/KR2021/003934
§ 371(c)(1), (2) Date Sep. 29, 2022,
PCT Pub. No. WO2021/201568, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 10-2020-0038383 (KR), filed on Mar. 30, 2020.
Prior Publication US 2023/0116562 A1, Apr. 13, 2023
Int. Cl. G02B 15/14 (2006.01); G02B 13/00 (2006.01); G02B 15/20 (2006.01); G02B 15/167 (2006.01)
CPC G02B 15/144 (2019.08) [G02B 13/0045 (2013.01); G02B 13/009 (2013.01); G02B 15/20 (2013.01); G02B 15/167 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A zoom optical system, comprising:
a first lens group, a second lens group, a third lens group, and a fourth lens group which are sequentially arranged from an object side to an image side,
wherein each of the first lens group to the fourth lens group includes two lenses,
wherein the second lens group and the third lens group are movable,
wherein the first lens group consists of a first lens and a second lens which are sequentially arranged from the object side to the image side,
wherein the second lens has an object side plane convex to the object side and an image side plane convex to the object side,
wherein the object side plane of the second lens has a larger curvature radius than a curvature radius of the image side plane of the second lens, and
wherein an effective focal length (EFL) in a telephoto is defined by Mathematical Expression below:

OG Complex Work Unit Math
where EFLtele refers to the effective focal length of the zoom optical system in the telephoto, and HimageD refers to a value of half a diagonal length of an image sensor pixel area.