Imaging lens and camera module
Provided is an imaging lens and a camera module, the device including in an orderly way from an object side, a first lens with positive (+) refractive power; a second lens with negative (−) refractive power; a third lens with negative (−) refractive power; a fourth lens with negative (−) refractive power; and a fifth lens with negative (−) refractive power, wherein the lens is concavely formed at an object side surface.
1. An imaging lens comprising: in order from an object side of the imaging lens:
a first lens of a positive lens having a convex surface on the object side thereof;
a second lens of a negative lens having a concave surface on the image side thereof;
a third lens having aspheric faces at both an object side surface and an image side surface;
a fourth lens in a meniscus shape having a concave surface on the object side thereof; and
a fifth lens of a negative lens in a meniscus shape,
wherein the third lens has an object-side surface that is concave at the optical axis.
2. The imaging lens according to claim 1 , wherein the third lens has a meniscus shape at the optical axis.
3. The imaging lens according to claim 1 , wherein the fifth lens has a meniscus shape at the optical axis and a convex surface on the object side thereof.
4. The imaging lens according to claim 1 , wherein the first lens has a meniscus shape at the optical axis.
5. The imaging lens according to claim 1 , wherein the fourth lens and the fifth lens are aspheric at both an object side surface and an image side surface.
6. The imaging lens according to claim 1 , wherein both surfaces of the second lens have a concave surface.
7. The imaging lens according to claim 1 , wherein the fourth lens has a meniscus shape at the optical axis.
8. The imaging lens according to claim 1 , wherein the fifth lens has all aspheric inflection points at the object side surface and an image side surface.
9. The imaging lens according to claim 1 , wherein the imaging lens satisfies a condition of 0.5<f1/f<1.5, where an overall focal length of the imaging lens is f, and a focal length of the first lens is f1.
10. The imaging lens according to claim 1 , wherein the imaging lens satisfies a condition of 0.5<ΣT/f<1.5, where an overall focal length of the imaging lens is f, and a distance from an object side surface of the first lens to an image-forming surface is ΣT.
11. The imaging lens according to claim 1 , wherein the imaging lens satisfies a condition of 1.6<N2<1.7, where a refractive index of the second lens is N2.
12. The imaging lens according to claim 1 , wherein the imaging lens satisfies a condition of 20<V2<30, where an Abbe number of the second lens is V2.
13. The imaging lens according to claim 1 , wherein an aperture is positioned at an object side surface of the first lens.
14. A camera module, comprising an imaging lens, a filter and a light receiving element in order from an object side, wherein the imaging lens comprises in order from an object side of the imaging lens:
a first lens of a positive lens having a convex surface on the object side thereof;
a second lens of a negative lens having a concave surface on the image side thereof;
a third lens with negative refractive power;
a fourth lens with refractive power; and
a fifth lens with refractive power and having aspheric inflection points at an object side surface and an image side surface,
wherein the following conditional expression is satisfied:
f1<|f2|<|f3|, wherein f1 is a focal length of the first lens, f2 is a focal length of the second lens, and f3 is a focal length of the third lens.
15. The camera module according to claim 14 , wherein the imaging lens satisfies a condition of 1.6<N2<1.7, where a refractive index of the second lens is N2.
16. The camera module according to claim 14 , wherein the second lens has a concave image side surface.
17. The camera module according to claim 14 , wherein the fifth lens has a convex object side surface.
18. The camera module according to claim 14 , wherein the fifth lens has negative refractive power.