US 12,242,037 B2
Optical system
Ju Hwa Son, 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 May 23, 2023, as Appl. No. 18/322,130.
Application 16/140,768 is a division of application No. 14/643,253, filed on Mar. 10, 2015, granted, now 10,114,195, issued on Oct. 30, 2018.
Application 18/322,130 is a continuation of application No. 17/831,553, filed on Jun. 3, 2022, granted, now 11,698,515.
Application 17/831,553 is a continuation of application No. 16/866,075, filed on May 4, 2020, granted, now 11,378,784, issued on Jul. 5, 2022.
Application 16/866,075 is a continuation of application No. 16/140,768, filed on Sep. 25, 2018, granted, now 10,678,026, issued on Jun. 9, 2020.
Claims priority of application No. 10-2014-0139756 (KR), filed on Oct. 16, 2014.
Prior Publication US 2023/0296864 A1, Sep. 21, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 9/64 (2006.01); G02B 13/00 (2006.01); G02B 13/04 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01); G02B 13/04 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An optical system comprising:
a first lens having negative refractive power, a concave object-side surface and a concave image-side surface;
a second lens having positive refractive power and a convex object-side surface;
a third lens having positive refractive power and a convex object-side surface;
a fourth lens having positive refractive power;
a fifth lens having negative refractive power;
a sixth lens having positive refractive power; and
a seventh lens having negative refractive power,
wherein the first to seventh lenses are sequentially disposed from an object side,
wherein the optical system has a total of seven lenses,
wherein the seventh lens has an inflection point formed on either one or both of an object-side surface of the seventh lens and an image-side surface of the seventh lens, and
wherein 3.7<TTL/EFL<4 is satisfied,
where TTL is a distance from an object-side surface of the first lens to an imaging surface of an image sensor, and EFL is an overall focal length of the optical system.