IP Library › Granted Patent US 11,422,339
Granted Patent B2
US 11,422,339 · App. 16/299,637 · Granted Aug 23, 2022

Optical imaging system

Inventors: Hag Chul Kim (Suwon-si, KR); Hwan Soo Park (Suwon-si, KR); Yong Joo Jo (Suwon-si, KR)
Assignee: Samsung Electro-Mechanics Co., Ltd.
G02B9/64G02B1/041G02B7/021G02B13/0045G02B27/0025G02B7/028
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Quick Facts
Patent No.
US 11,422,339
App. No.
16/299,637
Granted
Aug 23, 2022
Kind
B2
Abstract

An optical imaging system includes a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having negative refractive power; a fifth lens having positive refractive power; a sixth lens having positive refractive power; and a seventh lens having negative refractive power. At least five of the lenses are made of a plastic material.

Claims (53)

1. An optical imaging system, comprising:

a first lens having negative refractive power;

a second lens having negative refractive power;

a third lens having positive refractive power;

a fourth lens having negative refractive power;

a fifth lens having positive refractive power;

a sixth lens having positive refractive power; and

a seventh lens having negative refractive power,

wherein at least five of the lenses are made of a plastic material, and

wherein 20<Dmax/Dmin<25, where Dmax is a greatest value among a distance from an image-side surface of the first lens to an object-side surface of the second lens (D12), a distance from an image-side surface of the second lens to an object-side surface of the third lens (D23), a distance from an image-side surface of the third lens to an object-side surface of the fourth lens (D34), a distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens (D45), a distance from an image-side surface of the fifth lens to an object-side surface of the sixth lens (D56), and a distance from an image-side surface of the sixth lens to an object-side surface of the seventh lens (D67), and Dmin is a smallest value among D12, D23, D34, D45, D56, and D67.

2. The optical imaging system of claim 1 , wherein the first lens comprises a convex object-side surface.

3. The optical imaging system of claim 1 , wherein the third lens comprises a convex image-side surface.

4. The optical imaging system of claim 1 , wherein the fourth lens comprises a concave object-side surface.

5. The optical imaging system of claim 1 , wherein the fourth lens comprises a concave image-side surface.

6. The optical imaging system of claim 1 , wherein the fifth lens comprises a convex object-side surface.

7. The optical imaging system of claim 1 , wherein the sixth lens comprises a convex image-side surface.

8. The optical imaging system of claim 1 , wherein the seventh lens comprises a concave object-side surface.

9. The optical imaging system of claim 1 , wherein the seventh lens comprises a convex image-side surface.

10. An optical imaging system, comprising:

a first lens having negative refractive power;

a second lens having refractive power and having a refractive index less than 1.6;

a third lens having positive refractive power;

a fourth lens having negative refractive power;

a fifth lens having refractive power;

a sixth lens having refractive power; and

a seventh lens having refractive power and comprising a convex image-side surface,

wherein 20<Dmax/Dmin<25, where Dmax is a greatest value among a distance from an image-side surface of the first lens to an object-side surface of the second lens (D12), a distance from an image-side surface of the second lens to an object-side surface of the third lens (D23), a distance from an image-side surface of the third lens to an object-side surface of the fourth lens (D34), a distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens (D45), a distance from an image-side surface of the fifth lens to an object-side surface of the sixth lens (D56), and a distance from an image-side surface of the sixth lens to an object-side surface of the seventh lens (D67), and Dmin is a smallest value among D12, D23, D34, D45, D56, and D67.

11. The optical imaging system of claim 10 , wherein:

−0.65< f/f 2<−0.1,

where f is a focal length of the optical imaging system, and f2 is a focal length of the second lens.

12. The optical imaging system of claim 10 , wherein:

0.25< f/f 3<0.65,

where f is a focal length of the optical imaging system, and f3 is a focal length of the third lens.

13. The optical imaging system of claim 10 , wherein:

−0.5< f/f 4<0.1,

where f is a focal length of the optical imaging system, and f4 is a focal length of the fourth lens.

14. The optical imaging system of claim 10 , wherein:

0.25< f/f 6<0.65,

where f is a focal length of the optical imaging system, and f6 is a focal length of the sixth lens.

15. The optical imaging system of claim 10 , wherein:

−0.5< f/f 7<−0.1,

where f is a focal length of the optical imaging system, and f7 is a focal length of the seventh lens.

16. An optical imaging system, comprising:

a first lens having negative refractive power;

a second lens having negative refractive power;

a third lens having positive refractive power;

a fourth lens having negative refractive power;

a fifth lens having positive refractive power;

a sixth lens having positive refractive power; and

a seventh lens having negative refractive power,

wherein 20<Dmax/Dmin<25, where Dmax is a greatest value among a distance from an image-side surface of the first lens to an object-side surface of the second lens (D12), a distance from an image-side surface of the second lens to an object-side surface of the third lens (D23), a distance from an image-side surface of the third lens to an object-side surface of the fourth lens (D34), a distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens (D45), a distance from an image-side surface of the fifth lens to an object-side surface of the sixth lens (D56), and a distance from an image-side surface of the sixth lens to an object-side surface of the seventh lens (D67), and Dmin is a smallest value among D12, D23, D34, D45, D56, and D67.

17. The optical imaging system of claim 16 , wherein Nd 3 <1.640, Nd 4 <1.640, Nd 6 <1.535, and Nd 7 <1.640, where Nd 3 is a refractive index of the third lens, Nd 4 is a refractive index of the fourth lens, Nd 6 is a refractive index of the sixth lens, and Nd 7 is a refractive index of the seventh lens.

18. The optical imaging system of claim 16 , wherein TL/f<10, where f is a focal length of the optical imaging system and TL is a distance from the object-side surface of the first lens to an imaging plane.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 12, 2019
From: KIM, HAG CHUL; PARK, HWAN SOO; JO, YONG JOO
To: SAMSUNG ELECTRO-MECHANICS CO., LTD.
Reel/Frame 048573/0752 →
Priority Claims (1)
KR 10-2018-0115987 · Sep 28, 2018 · national
Continuity (1)
Related Publication 20200103620A1 · Apr 2, 2020