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 having refractive power and a convex object-side surface;
a second lens having refractive power and a convex object-side surface;
a third lens having refractive power and a convex object-side surface;
a fourth lens having refractive power and biconvex surfaces;
a fifth lens having refractive power and a convex image-side surface; and
a sixth lens having 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 a focal length of the first lens is within a range of 5.6 mm to 6.6 mm.
2. The lens module of claim 1 , wherein the first lens has a concave image-side surface.
3. The lens module of claim 1 , wherein the second lens has a convex image-side surface.
4. The lens module of claim 1 , wherein the third lens has a concave image-side surface.
5. The lens module of claim 1 , wherein the fifth lens has a concave object-side surface.
6. The lens module of claim 1 , wherein the sixth lens has a convex object-side surface.
7. The lens module of claim 1 , wherein the refractive power of the fifth lens is negative.
8. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
1.3<f1/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.
9. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
32.0<V1-V3
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 following Conditional Expression is satisfied:
30.0<V1-V4
where V1 is an Abbe number of the first lens, and V4 is an Abbe number of the fourth lens.
11. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
32.0<V1-V5
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 following Conditional Expression is satisfied:
0.9<f2/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.
13. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
f3/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.
14. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
3.0<f4/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.
15. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
f5/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.
16. 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.
17. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
1.4<f1/f2<5.0
where f1 is a focal length of the first lens, and f2 is a focal length of the second lens.
18. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
f2/f3<0.8
where f2 is a focal length of the second lens, and f3 is a focal length of the third lens.
19. 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.
20. The lens module of claim 1 , wherein the following Conditional Expression is satisfied:
0.02<D12/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.