High resolution lens module
A lens module includes a first lens having positive refractive power, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having positive or negative refractive power, and a sixth lens having negative refractive power. One or more inflection points may be formed on an image-side surface of the sixth lens.
1. A lens module comprising:
a first lens comprising refractive power and a convex object-side surface;
a second lens comprising refractive power, a convex object-side surface, and a convex image-side surface;
a third lens comprising refractive power and a convex object-side surface;
a fourth lens comprising refractive power and biconvex surfaces;
a fifth lens comprising refractive power and a convex image-side surface; and
a sixth lens comprising refractive power and a concave image-side surface, one or more inflection points being formed on the image-side surface of the sixth lens,
wherein the first to sixth lenses are sequentially disposed from an object side to an image side.
2. The lens module of claim 1 , wherein the first lens comprises a concave image-side surface.
3. The lens module of claim 1 , wherein the third lens comprises a concave image-side surface.
4. The lens module of claim 1 , wherein the fifth lens comprises a concave object-side surface.
5. The lens module of claim 1 , wherein the sixth lens comprises a convex object-side surface.
6. The lens module of claim 1 , wherein the refractive power of the fifth lens is negative.
7. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
1.3< f 1/ f< 2.5
where f1 is a focal length of the first lens, and f is an overall focal length of an optical system including the first to sixth lenses.
8. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
32.0< V 1− V 3
where V1 is an Abbe number of the first lens, and V3 is an Abbe number of the third lens.
9. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
30.0< V 1− V 4
where V1 is an Abbe number of the first lens, and V4 is an Abbe number of the fourth lens.
10. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
32.0< V 1− V 5
where V1 is an Abbe number of the first lens, and V5 is an Abbe number of the fifth lens.
11. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
0.9< f 2/ f
where f2 is a focal length of the second lens, and f is an overall focal length of an optical system including the first to sixth lenses.
12. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
f 3/ f<− 0.9
where f3 is a focal length of the third lens, and f is an overall focal length of an optical system including the first to sixth lenses.
13. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
3.0< f 4/ f
where f4 is a focal length of the fourth lens, and f is an overall focal length of an optical system including the first to sixth lenses.
14. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
f 5/ f<− 3.0
where f5 is a focal length of the fifth lens, and f is an overall focal length of an optical system including the first to sixth lenses.
15. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
1.1< OAL/f
where OAL is a distance from the object-side surface of the first lens to an image-sensing surface, and f is an overall focal length of an optical system including the first to sixth lenses.
16. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
1.4< f 1/ f 2<5.0
where f1 is a focal length of the first lens, and f2 is a focal length of the second lens.
17. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
f 2/ f 3<0.8
where f2 is a focal length of the second lens, and f3 is a focal length of the third lens.
18. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
0.25< BFL/f< 0.35
where BFL (Back Focus Length) is a distance from the image-side surface of the sixth lens to an image-sensing surface, and f is an overall focal length of an optical system including the first to sixth lenses.
19. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
0.02< D 12/ f
where D12 is a gap between the first and second lenses, and f is an overall focal length of an optical system including the first to sixth lenses.
20. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
0.3< r 1/ f< 0.8
where r1 is a radius of curvature of the object-side surface of the first lens, and f is an overall focal length of an optical system including the first to sixth lenses.
21. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
2.0< r 5/ f
where r5 is a radius of curvature of the object-side surface of the third lens, and f is an overall focal length of an optical system including the first to sixth lenses.
22. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
4.0< r 7/ f
where r7 is a radius of curvature of an object-side surface of the fourth lens, and f is an overall focal length of an optical system including the first to sixth lenses.
23. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
0.1< EPD/ 2/ f 1
where EPD/2 is a radius of an entrance pupil having an entrance pupil diameter (EPD), and f1 is a focal length of the first lens.
24. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
0.75< OAL/ImgH/ 2<0.85
where OAL is a distance from the object-side surface of the first lens to an image-sensing surface, and ImgH is a maximum height of an image that can be imaged by the lens module.
25. A lens module comprising: a first lens comprising refractive power and a convex object-side surface; a second lens comprising refractive power and a convex object-side surface; a third lens comprising refractive power and a convex object-side surface; a fourth lens comprising refractive power and biconvex surfaces; a fifth lens comprising refractive power and a convex image-side surface; and a sixth lens comprising refractive power and a concave image-side surface, one or more inflection points being formed on the image-side surface of the sixth lens, wherein the first to sixth lenses are sequentially disposed from an object side to an image side, and wherein the following is satisfied: 0.25<BFL/f<0.35 where BFL (Back Focus Length) is a distance from the image-side surface of the sixth lens to an image-sensing surface, and f is an overall focal length of an optical system including the first to sixth lenses.
26. A lens module comprising: a first lens comprising refractive power and a convex object-side surface; a second lens comprising refractive power and a convex object-side surface; a third lens comprising refractive power and a convex object-side surface; a fourth lens comprising refractive power and biconvex surfaces; a fifth lens comprising refractive power and a convex image-side surface; and a sixth lens comprising refractive power and a concave image-side surface, one or more inflection points being formed on the image-side surface of the sixth lens, wherein the first to sixth lenses are sequentially disposed from an object side to an image side, and wherein the following is satisfied: 0.75<OAL/ImgH/2<0.85 where OAL is a distance from the object-side surface of the first lens to an image-sensing surface, and ImgH is a maximum height of an image that can be imaged by the lens module.