US 11,852,896 B2
Optical imaging system and camera module including the same
Jae Hyuk Huh, Suwon-si (KR); Jin Se Kim, Suwon-si (KR); Yong Joo Jo, Suwon-si (KR); and Hyo Jin Hwang, 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 Aug. 28, 2020, as Appl. No. 17/005,765.
Claims priority of application No. 10-2019-0107774 (KR), filed on Aug. 30, 2019.
Prior Publication US 2021/0063687 A1, Mar. 4, 2021
Int. Cl. G02B 9/60 (2006.01); G02B 13/00 (2006.01); G02B 5/20 (2006.01); G02B 3/04 (2006.01)
CPC G02B 9/60 (2013.01) [G02B 13/0045 (2013.01); G02B 3/04 (2013.01); G02B 5/208 (2013.01)] 40 Claims
OG exemplary drawing
 
1. An optical imaging system comprising:
a first lens, a second lens comprising a concave object-side surface and a concave image-side surface in a paraxial region thereof, a third lens, a fourth lens, and a fifth lens sequentially disposed in ascending numerical order along an optical axis from an object-side surface of the first lens toward an imaging plane of an image sensor; and
a first reflective member disposed between an object side of the optical imaging system and the object-side surface of the first lens, the first reflective member comprising a reflective surface configured to receive incident light from an object and reflect the incident light toward the object-side surface of the first lens,
wherein the first lens has a positive refractive power, a non-circular shape when the first lens is viewed in a direction of the optical axis, a first axis intersecting the optical axis and perpendicular to the optical axis, and a second axis intersecting the optical axis and perpendicular to the optical axis and the first axis, a length of the first axis being greater than a length of the second axis, and
the following conditional expressions are satisfied:
3.5≤TTL/IMG HT,
|f1+f2|<2.0 mm,
0.7≤L1S1es/L1S1el<1.0, and
0<L1S1el/PTTL<0.14,
where TTL is a distance along the optical axis from the object-side surface of the first lens to the imaging plane of the image sensor, IMG HT is one-half of a diagonal length of the imaging plane of the image sensor, f1 is a focal length of the first lens, f2 is a focal length of the second lens, L1S1el is a maximum effective radius of the object-side surface of the first lens when the first lens is viewed in the direction of the optical axis, L1S1es is a minimum effective radius of the object-side surface of the first lens when the first lens is viewed in the direction of the optical axis, and PTTL is a distance along the optical axis from the reflective surface of the first reflective member to the imaging plane of the image sensor.