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 to an image side:
a first lens with positive (+) refractive power and convexly formed at an object side surface;
a second lens with negative (−) refractive power;
a third lens having aspheric faces at both an object side surface and an image side surface;
a fourth lens; and
a fifth lens with negative (−) refractive power, wherein the fifth lens is convexly formed at an object side surface,
wherein the second lens is concavely formed at an object side surface.
2. The imaging lens of claim 1 , wherein the third lens is concavely formed at an object side surface.
3. The imaging lens of claim 2 , wherein the third lens is a lens of a meniscus form.
4. The imaging lens of claim 1 , wherein the fifth lens is a lens of a meniscus form.
5. The imaging lens of claim 1 , wherein the first lens is a lens of a meniscus form.
6. The imaging lens of claim 1 , wherein the second lens is concave at both sides.
7. The imaging lens of claim 1 , wherein each of the fourth lens and the fifth lens has an aspheric face at both an object side surface and an image side surface.
8. The imaging lens of claim 1 , wherein the fourth lens is concavely formed at an object side surface.
9. The imaging lens of claim 8 , wherein the fourth lens is of a meniscus form.
10. The imaging lens of claim 1 , wherein the fifth lens has all aspheric inflection points at the object side surface and an image side surface.
11. The imaging lens of claim 1 , wherein the imaging lens satisfies a condition of 0.5<f 1 /f<1.5, where an overall focal length of the imaging lens is f, and a focal length of the first lens is f 1 .
12. The imaging lens of 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.
13. The imaging lens of claim 1 , wherein the imaging lens satisfies a condition of 1.6<N 2 <1.7, where a refractive index of the second lens is N 2 .
14. The imaging lens of claim 1 , wherein the imaging lens satisfies a condition of 20<V 2 <30, where an Abbe number of the second lens is V 2 .
15. The imaging lens of claim 1 , wherein an aperture is positioned at an object side surface of the first lens.
16. A camera module, comprising in order from an object side to an image side:
a first lens with positive (+) refractive power and having a convex object side surface;
a second lens with negative (−) refractive power;
a third lens with refractive power;
a fourth lens with refractive power and having a concave object side surface; and
a fifth lens with refractive power, and having aspheric inflection points at an object side surface and an image side surface.
17. The camera module of claim 16 , wherein the imaging lens satisfies a condition of 1.6<N 2 <1.7, where a refractive index of the second lens is N 2 .
18. The camera module of claim 16 , wherein the second lens has a concave object side surface.
19. The camera module of claim 16 , wherein the fifth lens has a convex object side surface.
20. The camera module of claim 16 , wherein the third lens has negative refractive power.