Lens module
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].
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]
where OAL is a distance from an object-side surface of the first lens to an image surface, and f5 is a focal length of the fifth lens.
31. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
| OAL/f 6|>0.2 [Conditional Expression]
where OAL is a distance from an object-side surface of the first lens to an image surface, and f6 is a focal length of the sixth lens.
32. A lens module, comprising:
six lenses comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, in order from an object side to an image side,
wherein:
the first and second lenses have positive refractive power,
the fifth lens comprises a concave object-side surface and a convex image-side surface,
the sixth lens is convex toward the object side and concave toward the image side at the center thereof, an object-side surface of the sixth lens having at least three inflection points, and
the lens module satisfies the following conditional expression:
1.0< f 1/ f< 2.0
where f is an overall focal length of the lens module, and f1 is a focal length of the first lens.
33. The lens module of claim 32 , wherein a distance between the third lens and the fourth lens is shorter than a distance between the fourth lens and the fifth lens.
34. The lens module of claim 32 , further comprising a stop disposed between the second lens and the third lens.
35. The lens module of claim 32 , wherein:
the first and third lenses comprise a convex object-side surface and a concave image-side surface,
the second lens comprises a biconvex surface,
the fourth lens comprises a concave object-side surface and a convex image-side surface, and
an image-side surface of the sixth lens has at least one inflection point.
36. The lens module of claim 32 , wherein the lens module satisfies the following conditional expression:
| f 1/ f 3|<3.0
where f1 is the focal length of the first lens, and f3 is a focal length of the third lens.
37. The lens module of claim 32 , wherein the lens module satisfies the following conditional expression:
0< f 1/ f 4<1.5
where f1 is the focal length of the first lens, and f4 is a focal length of the fourth lens.
38. The lens module of claim 32 , wherein the lens module satisfies the following conditional expression:
| f 1/ f 5|<1.5
where f1 is the focal length of the first lens, and f5 is a focal length of the fifth lens.
39. The lens module of claim 32 , wherein the lens module satisfies the following conditional expression:
| f 1/ f 6|<1.5
where f1 is the focal length of the first lens, and f6 is a focal length of the sixth lens.
40. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
V 4/30+ V 5/30<2.0
where V4 is an Abbe number of the fourth lens, and V5 is an Abbe number of the fifth lens.
41. The lens module of claim 32 , wherein the lens module satisfies one or more of the following conditional expressions:
0.03< IP 611/2 Y< 0.04, [Conditional Expression 1]
0.20< IP 612/2 Y< 0.30, [Conditional Expression 2]
0.27< IP 613/2 Y< 0.48, [Conditional Expression 3]
where IP611 is a radius from an optical axis of the sixth lens to a first inflection point formed on an object-side surface of the sixth lens, IP612 is a radius from the optical axis of the sixth lens to a second inflection point formed on the object-side surface of the sixth lens, IP613 is a radius from the optical axis of the sixth lens to a third inflection point formed on the object-side surface of the sixth lens, and 2Y is a diagonal length of an image surface.
42. The lens module of claim 32 , wherein the lens module satisfies one or more of the following conditional expressions:
0.08< IP 611/ L 61 ER< 0.11, [Conditional Expression 1]
0.54< IP 612/ L 61 ER< 0.76, [Conditional Expression 2]
0.97< IP 613/ L 61 ER< 0.99, [Conditional Expression 3]
where IP611 is a radius from an optical axis of the sixth lens to a first inflection point formed on an object-side surface of the sixth lens, IP612 is a radius from the optical axis of the sixth lens to a second inflection point formed on the object-side surface of the sixth lens, IP613 is a radius from the optical axis of the sixth lens to a third inflection point formed on the object-side surface of the sixth lens, and L61ER is a radius of an effective region on the object-side surface of the sixth lens.
43. The lens module of claim 1 , wherein the lens module satisfies one or more of the following conditional expressions:
0.03< IP 621/2 Y< 0.06, [Conditional Expression 1]
0.25< IP 622/2 Y< 0.46, [Conditional Expression 2]
0.38< IP 623/2 Y< 0.43, [Conditional Expression 3]
where IP621 is a radius from an optical axis of the sixth lens to a first inflection point formed on an image-side surface of the sixth lens, IP622 is a radius from the optical axis of the sixth lens to a second inflection point formed on the image-side surface of the sixth lens, IP623 is a radius from the optical axis of the sixth lens to a third inflection point on the image-side surface of the sixth lens, and 2Y is a diagonal length of an image surface.
44. The lens module of claim 1 , wherein the lens module satisfies one or more of the following conditional expressions:
0.09< IP 621/ L 62 ER< 0.13, [Conditional Expression 1]
0.85< IP 622/ L 62 ER< 0.89, [Conditional Expression 2]
0.94< IP 623/ L 62 ER< 0.99, [Conditional Expression 3]
where IP621 is a radius from an optical axis of the sixth lens to a first inflection point formed on an image-side surface of the sixth lens, IP622 is a radius from the optical axis of the sixth lens to a second inflection point formed on the image-side surface of the sixth lens, IP623 is a radius from the optical axis of the sixth lens to a third inflection point formed on the image-side surface of the sixth lens, and L62ER is a radius of an effective region on the image-side surface of the sixth lens.
45. The lens module of claim 1 , wherein the lens module satisfies one or more of the following conditional expressions:
1.02< Pt 1/ CT 6<1.25, [Conditional Expression 1]
1.15< Pt 2/ CT 6<1.43, [Conditional Expression 2]
1.02< Pt 3/ CT 6<1.36, [Conditional Expression 3]
0.79< Pt 1/ Pt 2<0.97, [Conditional Expression 4]
0.83< Pt 1/ Pt 3<1.12, [Conditional Expression 5]
0.94< Pt 2/ Pt 3<1.27, [Conditional Expression 6]
where CT6 is a thickness of the sixth lens along an optical axis, Pt1 is a thickness at a first concave point, Pt2 is a thickness at a first convex point, and Pt3 is thickness at a second convex point.