Lens module
A lens module may include: a first lens having positive refractive power and having a convex object-side surface and a concave image-side surface; a second lens having refractive power and having two convex surfaces; a third lens having refractive power and having a convex object-side surface; a fourth lens having refractive power; and a fifth lens having refractive power and having a convex object-side surface, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are disposed in a sequential order from the first lens to the fifth lens.
1. A lens module comprising:
a first lens having positive refractive power and having a convex object-side surface and a concave image-side surface;
a second lens having two convex surfaces;
a third lens having a convex object-side surface;
a fourth lens; and
a fifth lens having a convex object-side surface, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are disposed in a sequential order from the first lens to the fifth lens, wherein the lens module satisfies the following conditional expression:
0.6<2* L 51 ER /ImgH<0.8 [Conditional expression]
where L51ER is a radius of an effective area refracting incident light from an object-side surface of the fifth lens, and ImgH is a diagonal length of an imaging surface.
2. The lens module of claim 1 , wherein the fifth lens has one or more inflection points formed on an image-side surface thereof.
3. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
39<(ANG*ImgH)/(Fno*TTL)<52 [Conditional expression]
wherein ANG is a field of view (or an angle of view) of the optical system composed of the first to fifth lenses, ImgH is a diagonal length of an imaging surface, Fno is a constant (F No.) representing brightness of the optical system, and TTL is a distance from an object-side surface of the first lens to the imaging surface.
4. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
0.33< r 1/ f< 0.39 [Conditional expression]
where r1 is a radius of curvature of the object-side surface of the first lens and f is an overall focal length of the optical system composed of the first to fifth lenses.
5. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
0.36< r 2/ f< 0.41 [Conditional expression]
where r2 is a radius curvature of the image-side surface of the first lens and f is an overall focal length of the optical system composed of the first to fifth lenses.
6. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
0.43< r 3/ f< 0.47 [Conditional expression]
where r3 is a radius curvature of the object-side surface of the second lens and f is an overall focal length of the optical system composed of the first to fifth lenses.
7. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
0.65<TTL/ImgH<0.85 [Conditional expression]
where TTL is a distance from an object-side surface of the first lens to an imaging surface, and ImgH is a diagonal length of the imaging surface.
8. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
Fno<2.3 [Conditional expression]
where Fno is a constant representing brightness of the optical system composed of the first to fifth lenses.
9. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
31<ANG/Fno [Conditional expression]
where ANG is a field of view of the optical system composed of the first to fifth lenses and Fno is a constant representing brightness of the optical system.
10. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
V 4<27 [Conditional expression]
where V4 is the Abbe number of the fourth lens.
11. The lens module of claim 1 , wherein the second lens, the third lens, the fourth lens, and the fifth lens each comprise refractive power.
12. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
25< V 1− V 3 [Conditional expression]
where V1 is the Abbe number of the first lens and V3 is the Abbe number of the third lens.
13. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
4.0< f 1/ f [Conditional expression]
where f1 is a focal length of the first lens and f is an overall focal length of the optical system composed of the first to fifth lenses.
14. 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 an overall focal length of the optical system composed of the first to fifth lenses.
15. 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 an overall focal length of the optical system composed of the first to fifth lenses.
16. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
TTL/ f< 1.5 [Conditional expression]
where TTL is a distance from an object-side surface of the first lens to an imaging surface and f is an overall focal length of the optical system composed of the first to fifth lenses.
17. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
|TTL/ f 2|<1.9 [Conditional expression]
where TTL is a distance from an object-side surface of the first lens to an imaging surface and f2 is a focal length of the second lens.
18. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
|TTL/ f 3|<1.0 [Conditional expression]
where TTL is a distance from an object-side surface of the first lens to an imaging surface and f3 is a focal length of the third lens.
19. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
|TTL/ f 4|<1.7 [Conditional expression]
where TTL is a distance from an object-side surface of the first lens to an imaging surface and f4 is a focal length of the fourth lens.
20. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
5.0< f 1/ f 2 [Conditional expression]
where f1 is a focal length of the first lens and f2 is a focal length of the second lens.
21. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
0.3<| f 2/ f 3|<1.0 [Conditional expression]
where f2 is a focal length of the second lens and f3 is a focal length of the third lens.
22. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
| f 3/ f 4|<1.7 [Conditional expression]
where f3 is a focal length of the third lens and f4 is a focal length of the fourth lens.
23. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
1.0<| f 4/ f 5| [Conditional expression]
where f4 is a focal length of the fourth lens and f5 is a focal length of the fifth lens.
24. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
1.0<| f 1/ f 3|<5.0 [Conditional expression]
where f1 is a focal length of the first lens and f3 is a focal length of the third lens.
25. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
| f 1/ f 4|<7.0 [Conditional expression]
where f1 is a focal length of the first lens and f4 is a focal length of the fourth lens.
26. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
0.9<| f 1/ f 5| [Conditional expression]
where f1 is a focal length of the first lens and f5 is a focal length of the fifth lens.
27. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
0.2< BFL/f [Conditional expression]
where BFL is a distance from an image-side surface of the fifth lens to an imaging surface and f is an overall focal length of the optical system composed of the first to fifth lenses.
28. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
0.01< D 12/ f [Conditional expression]
where D12 is a distance from an image-side surface of the first lens to an object-side surface of the second lens and f is an overall focal length of the optical system composed of the first to fifth lenses.
29. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
| r 4/ f|< 3.0 [Conditional expression]
where r4 is a radius of curvature of an image-side surface of the second lens and f is an overall focal length of the optical system composed of the first to fifth lenses.
30. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
1.0<| r 5/ f| [Conditional expression]
where r5 is a radius of curvature of an object-side surface of the third lens and f is an overall focal length of the optical system composed of the first to fifth lenses.
31. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
0.5<| r 6/ f| [Conditional expression]
where r6 is a radius of curvature of an image-side surface of the third lens and f is an overall focal length of the optical system composed of the first to fifth lenses.
32. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
1.0<| r 7/ f| [Conditional expression]
where r7 is a radius of curvature of an object-side surface of the fourth lens and f is an overall focal length of the optical system composed of the first to fifth lenses.
33. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
1.0<| r 8/ f| [Conditional expression]
where r8 is a radius of curvature of an image-side surface of the fourth lens and f is an overall focal length of the optical system composed of the first to fifth lenses.
34. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
0.3<| r 9/ f| [Conditional expression]
where r9 is a radius of curvature of an object-side surface of the fifth lens and f is an overall focal length of the optical system composed of the first to fifth lenses.
35. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
0.2<| r 10/ f| [Conditional expression]
where r10 is a radius of curvature of an image-side surface of the fifth lens and f is an overall focal length of the optical system composed of the first to fifth lenses.
36. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
5.0< D 12/ D 23 [Conditional expression]
where D12 is a distance from an image-side surface of the first lens to an object-side surface of the second lens and D23 is a distance from an image-side surface of the second lens to an object-side surface of the third lens.
37. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
D 23/ D 34<0.1 [Conditional expression]
where D23 is a distance from an image-side surface of the second lens to an object-side surface of the third lens and D34 is a distance from an image-side surface of the third lens to an object-side surface of the fourth lens.
38. The lens module of claim 1 , wherein the lens module satisfies the following conditional expression:
D 34/ D 45<3.0 [Conditional expression]
where D34 is a distance from an image-side surface of the third lens to an object-side surface of the fourth lens and D45 is a distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens.
39. The lens module of claim 1 , further comprising
a stop disposed in front of the object-side of the first lens or an object-side of the third lens.
40. A lens module comprising:
a first lens having positive refractive power and having a convex object-side surface and a concave image-side surface;
a second lens having refractive power and having two convex surfaces;
a third lens having refractive power;
a fourth lens having refractive power; and
a fifth lens having refractive power and having one or more inflection points formed on an image-side surface thereof, wherein the fifth lens satisfies the following conditional expression:
0.09IP521/ L 52 ER< 0.12 [Conditional expression]
where IP521 is a radius from the optical axis to an inflection point, among inflection points formed on an image-side surface of the fifth lens, formed in a position closest to the optical axis and L52ER is a radius of an effective area refracting incident light from the image-side surface of the fifth lens.
41. The lens module of claim 40 , wherein the lens module satisfies the following conditional expression:
0.36<2*IP512/ImgH<0.61 [Conditional expression]
where IP512 is a radius from optical axis to an inflection point, among inflection points formed on an object-side surface of the fifth lens, formed in a position second-closest to the optical axis and ImgH is a diagonal length of an imaging surface.
42. The lens module of claim 40 , wherein the lens module satisfies the following conditional expression:
0.07<2*IP521/ImgH<0.10 [Conditional expression]
where IP521 is a radius from the optical axis to an inflection point, among inflection points formed on an image-side surface of the fifth lens, formed in a position closest to the optical axis and ImgH is a diagonal length of an imaging surface.
43. The lens module of claim 40 , wherein the lens module satisfies the following conditional expression:
0.08<IP511 /L 51 ER< 0.11 [Conditional expression]
where IP511 is a radius from the optical axis to an inflection point, among inflection points formed on the object-side surface of the fifth lens, formed in a position closest to the optical axis and L51ER is a radius of an effective area refracting incident light from an object-side surface of the fifth lens.
44. The lens module of claim 40 , wherein the lens module satisfies the following conditional expression:
0.58<IP512 /L 51 ER< 0.84 [Conditional expression]
where IP512 is a radius from optical axis to an inflection point, among inflection points formed on the object-side surface of the fifth lens, formed in a position second-closest to the optical axis and L51ER is a radius of an effective area refracting incident light from an object-side surface of the fifth lens.
45. The lens module of claim 40 , wherein the lens module satisfies the following conditional expression:
0.05<2 *IP 511/ImgH<0.08 [Conditional expression]
where IP511 is a radius from the optical axis to an inflection point, among inflection points formed on the object-side surface of the fifth lens, formed in a position closest to the optical axis and ImgH is a diagonal length of an imaging surface.
46. The lens module of claim 40 , wherein the third lens has a convex object-side surface.
47. A lens module comprising:
a first lens having refractive power;
a second lens having refractive power;
a third lens having refractive power;
a fourth lens having refractive power; and
a fifth lens having refractive power, having a convex object-side surface, and having an aspherical shape with four or more inflection points formed on the object-side surface thereof, wherein the lens module satisfies the following conditional expression:
1.90< L 51 ER< 2.65 [Conditional expression]
where L51ER is a radius of an effective area refracting incident light from an object-side surface of the fifth lens.
48. The lens module of claim 47 , wherein the lens module satisfies the following conditional expression:
2.18< L 52 ER< 2.95 [Conditional expression]
where L52ER is a radius of an effective area refracting incident light from an image-side surface of the fifth lens.
49. A lens module comprising:
first to fifth lenses disposed, starting from an object-side, in order and respectively having refractive power,
wherein the fifth lens has an aspherical shape with a first concave point formed in a portion not intersecting an optical axis of an object-side surface thereof and a first convex point formed in a portion not intersecting an optical axis of an image-side surface thereof, and satisfies the following conditional expression:
0.93< Pt 1/ CT 5<1.38 [Conditional expression]
where CT5 is a thickness at the center of the optical axis of the fifth lens and Pt1 is a thickness at the first concave point.
50. The lens module of claim 49 , wherein the lens module satisfies the following conditional expression:
1.27< Pt 2/ CT 5<1.71 [Conditional expression]
where CT5 is a thickness at the center of the optical axis of the fifth lens and Pt2 is a thickness at the first convex point.
51. The lens module of claim 49 , wherein the lens module satisfies the following conditional expression:
0.56< Pt 1/ Pt 2<1.01 [Conditional expression]
where Pt1 is a thickness at the first concave point and Pt2 is a thickness at the first convex point.
52. The lens module of claim 49 , wherein the lens module satisfies the following conditional expression:
0.44< Pt 1<0.72 [Conditional expression]
where Pt1 is a thickness at the first concave point.
53. The lens module of claim 49 , wherein the lens module satisfies the following conditional expression:
0.61< Pt 2<0.87 [Conditional expression]
where Pt2 is a thickness at the first convex point.