Lens module

Patent metadata

Field	Value
Publication number	US-9354423-B2
Application number	US-201414321782-A
Country	US
Kind code	B2
Filing date	Jul 1, 2014
Priority date	Nov 8, 2013
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

A lens module may include a first lens having positive refractive power, a second lens having positive refractive power, a third lens having refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, and a sixth lens having negative refractive power and having one or more inflection points formed on an image-side surface thereof. An overall focal length of the lens module f and a focal length of the first lens f1 may satisfy the following Conditional Expression:

1.0< f 1/ f <2.0  [Conditional Expression].

First claim

What is claimed is:

1. A lens module comprising:
a first lens having positive refractive power;
a second lens having positive refractive power;
a third lens having refractive power;
a fourth lens having positive refractive power;
a fifth lens having negative refractive power; and
a sixth lens having negative refractive power and having at least three inflection points formed on an image-side surface thereof,
wherein an overall focal length of the lens module f and a focal length of the first lens f1 satisfy the following Conditional Expression:
1.0< f 1/ f< 2.0  [Conditional Expression].

2. The lens module of claim 1 , wherein an object-side surface of the first lens is convex, and an image-side surface of the first lens is concave.

3. The lens module of claim 1 , wherein an object-side surface of the second lens is convex, and an image-side surface of the second lens is convex.

4. The lens module of claim 1 , wherein an object-side surface of the third lens is convex, and an image-side surface of the third lens is concave.

5. The lens module of claim 1 , wherein an object-side surface of the fourth lens is concave, and an image-side surface of the fourth lens is convex.

6. The lens module of claim 1 , wherein an object-side surface of the fifth lens is concave, and an image-side surface of the fifth lens is convex.

7. The lens module of claim 1 , wherein an object-side surface of the sixth lens is convex, and the image-side surface of the sixth lens is concave.

8. The lens module of claim 1 , wherein the sixth lens has a shape in which one or more inflection points are formed on an object-side surface thereof.

9. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
V 1− V 3>25.0  [Conditional Expression]

where V1 is an Abbe number of the first lens, and V3 is an Abbe number of the third lens.

10. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
n 4>1.6  [Conditional Expression]

where n4 is a refractive index of the fourth lens.

11. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
V 1− V 5>25.0  [Conditional Expression]

where V1 is an Abbe number of the first lens, and V5 is an Abbe number of the fifth lens.

12. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
0.5< f 2/ f< 1.5  [Conditional Expression]

where f2 is a focal length of the second lens, and f is the overall focal length of the lens module.

13. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
2.0<| f 5/ f|< 100  [Conditional Expression]

where f5 is a focal length of the fifth lens, and f is the overall focal length of the lens module.

14. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
OAL/f< 1.5  [Conditional Expression]

where OAL is a distance from an object-side surface of the first lens to an image surface, and f is the overall focal length of the lens module.

15. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
1.0< f 1/ f 2<2.5  [Conditional Expression]

where f1 is the focal length of the first lens, and f2 is a focal length of the second lens.

16. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
0.3<| f 2/ f 3|<2.0  [Conditional Expression]

where f2 is a focal length of the second lens, and f3 is a focal length of the third lens.

17. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
BFL/f> 0.2  [Conditional Expression]

where BFL is a distance from the image-side surface of the sixth lens to an image surface, and f is the overall focal length of the lens module.

18. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
D 1/ f> 0.01  [Conditional Expression]

where D1 is an air gap between the first lens and the second lens, and f is the overall focal length of the lens module.

19. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
r 1/ f> 0.3  [Conditional Expression]

where r1 is a radius of curvature of an object-side surface of the first lens, and f is the overall focal length of the lens module.

20. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
r 6/ f> 0.3  [Conditional Expression]

where r6 is a radius of curvature of an image-side surface of the third lens, and f is the overall focal length of the lens module.

21. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
EPD/ 2/ f 1>0.1  [Conditional Expression]

where EPD/2 is a size of an entrance pupil, and f1 is the focal length of the first lens.

22. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
| f 3/ f|< 2.0  [Conditional Expression]

where f3 is a focal length of the third lens, and f is the overall focal length of the lens module.

23. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
f 4/ f> 3.0  [Conditional Expression]

where f4 is a focal length of the fourth lens, and f is the overall focal length of the lens module.

24. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
| f 5/ f|> 3.0  [Conditional Expression]

where f5 is a focal length of the fifth lens, and f is the overall focal length of the lens module.

25. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
| f 6/ f|< 6.0  [Conditional Expression]

where f6 is a focal length of the sixth lens, and f is the overall focal length of the lens module.

26. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
OAL/f 1>0.5  [Conditional Expression]

where OAL is a distance from an object-side surface of the first lens to an image surface, and f1 is the focal length of the first lens.

27. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
0< OAL/f 2<1.7  [Conditional Expression]

where OAL is a distance from an object-side surface of the first lens to an image surface, and f2 is a focal length of the second lens.

28. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
| OAL/f 3|>1.0  [Conditional Expression]

where OAL is a distance from an object-side surface of the first lens to an image surface, and f3 is a focal length of the third lens.

29. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
0< OAL/f 4<0.5  [Conditional Expression]

where OAL is a distance from an object-side surface of the first lens to an image surface, and f4 is a focal length of the fourth lens.

30. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
| OAL/f 5|<0.5  [Conditional Expression]

Assignees

• Samsung Electro Mech

Inventors

• Park Il Yong
• Jo Yong Joo
• Son Ju Hwa
• Jung Jin Hwa
• Baik Jae Hyun
• You Ho Sik
• Jung Phil Ho
• Chae Kyu Min

Classifications

• G02B9/62 Primary

  having six components only · CPC title

• G02B13/0045 Primary

  having five or more lenses · CPC title