US 12,092,799 B2
Optical imaging system
Hag Chul Kim, Suwon-si (KR); Phil Ho Jung, Suwon-si (KR); and Yong Joo Jo, Suwon-si (KR)
Assigned to Samsung Electro-Mechanics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electro-Mechanics Co., Ltd., Suwon-si (KR)
Filed on Mar. 25, 2021, as Appl. No. 17/212,229.
Claims priority of application No. 10-2020-0181646 (KR), filed on Dec. 23, 2020.
Prior Publication US 2022/0196992 A1, Jun. 23, 2022
Int. Cl. G02B 13/00 (2006.01); G02B 9/12 (2006.01); G02B 15/14 (2006.01); G03B 17/17 (2021.01)
CPC G02B 13/0065 (2013.01) [G02B 9/12 (2013.01); G02B 13/0045 (2013.01); G02B 13/009 (2013.01); G02B 15/143 (2019.08); G02B 15/1435 (2019.08); G02B 15/143503 (2019.08); G03B 17/17 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An optical imaging system comprising:
a first lens group, a second lens group, and a third lens group, sequentially arranged from an object side; and
an optical path folding element disposed on the object side of the first lens group,
wherein the first lens group includes two lenses having negative and positive refractive power,
wherein the second lens group includes a plurality of lenses,
wherein the third lens group includes two lenses having negative and positive refractive power,
wherein the first lens group includes a first lens having a concave object-side surface,
wherein the optical imaging system comprises no more than three lens groups and no more than seven lenses,
wherein a ratio TTL/fw between a distance TTL from an object-side surface of a frontmost lens of the first lens group to an imaging plane of the optical imaging system and a focal length fw of the optical imaging system at a most wide-angle end is 2.0 to 3.0,
wherein 3.6<fw/IMG_HT<4.6 where IMG_HT is a height of the imaging plane,
wherein 0.6<fw/f4<1.2 where f4 is a focal length of a fourth lens of the seven lenses, and
wherein −3.0<ft/f1<−1.0 where f1 is a focal length of the first lens and ft is a focal length of the optical imaging system at a telephoto end.