US 11,953,663 B2
Zoom optical system
Tae Youn Lee, Suwon-si (KR); and Jung Hui Ko, 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 Jan. 31, 2023, as Appl. No. 18/103,638.
Application 18/103,638 is a continuation of application No. 16/847,774, filed on Apr. 14, 2020, granted, now 11,604,338.
Application 16/847,774 is a continuation of application No. 16/502,981, filed on Jul. 3, 2019, granted, now 10,663,706, issued on May 26, 2020.
Application 16/502,981 is a continuation of application No. 16/032,676, filed on Jul. 11, 2018, granted, now 10,394,006, issued on Aug. 27, 2019.
Application 16/032,676 is a continuation of application No. 15/285,833, filed on Oct. 5, 2016, granted, now 10,048,475, issued on Aug. 14, 2018.
Claims priority of application No. 10-2016-0009269 (KR), filed on Jan. 26, 2016.
Prior Publication US 2023/0176345 A1, Jun. 8, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 15/14 (2006.01); G02B 13/00 (2006.01); G02B 5/00 (2006.01); G02B 5/20 (2006.01); G02B 13/02 (2006.01); G02B 27/00 (2006.01)
CPC G02B 15/143507 (2019.08) [G02B 13/009 (2013.01); G02B 15/14 (2013.01); G02B 5/005 (2013.01); G02B 5/208 (2013.01); G02B 13/02 (2013.01); G02B 27/0025 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A zoom optical system, comprising:
a first lens group comprising a negative refractive power;
a second lens group comprising a positive refractive power; and
a third lens group comprising a positive refractive power,
wherein
the first to third lens groups are sequentially disposed from an object side toward an imaging plane,
upon zooming from a wide-angle position to a telephoto position, a gap between the first and second lens groups is decreased,
a gap between the second and third lens groups is adjustable,
the first lens group comprises a first lens and a second lens having a convex object-side surface, the second lens group comprises a third lens, a fourth lens having a convex object-side surface, and a fifth lens, and the third group comprises a sixth lens, and
1.9≥|fG1/fw|≥3.0, 4.0<ft/fw<7.0, and 1.61<n4<1.68, where fw is an overall focal length of the zoom optical system in the wide-angle position, fG1 is a synthesized focal length of the first lens group, ft is an overall focal length of the zoom optical system in the telephoto position, and n4 is a refractive index of the fourth lens.