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 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 third lens is concavely formed at an object side surface, and
wherein the fifth lens is convexly formed at an object side surface.
2. The imaging lens of claim 1 , wherein the third lens, the fourth lens and the fifth lens are all imaging lenses having aspheric faces at an object side surface and an imaging side surface.
3. The imaging lens of claim 1 , wherein the fourth lens is concavely formed at an object side surface.
4. The imaging lens of claim 1 , wherein the fifth lens is formed with an inflection point at each of an object side surface and an imaging side surface.
5. The imaging lens of claim 4 , wherein the inflection point is an aspheric inflection point.
6. The imaging lens of claim 1 , wherein the third lens, the fourth lens and the fifth lens are lenses of a meniscus form.
7. The imaging lens of claim 1 , wherein when an overall focal length of the imaging lens is f, and a focal length of the first lens is f1, the imaging lens satisfies a condition of 0.5<f1/f<1.5.
8. The imaging lens of claim 1 , wherein the imaging lens satisfies a condition of 0.5<T/f<1.5, when 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 T.
9. The imaging lens of claim 1 , wherein the imaging lens satisfies a condition of 1.6<N2<1.7, when a refractive power of the second lens is N2.
10. The imaging lens of claim 1 , wherein the imaging lens satisfies a condition of 20<V2<30, when an Abbe number of the second lens is V2.
11. A camera module comprising:
a lens group including a first lens having positive (+) refractive power, a second lens having negative (−) refractive power and a third through a fifth lenses being all aspheric planes at an object side and an imaging side, in an order from the object side;
a filter transmitting light visible rays and reflecting infrared from light passed through the lens group; and
a light reception device receiving light visible rays passed through the filter,
wherein the fifth lens has all aspheric inflection points at the object side surface and an imaging side surface.
12. The camera module of claim 11 , wherein the third through fifth lenses have negative (−) refracting power.
13. The camera module of claim 11 , wherein the third lens is concave at the object side.
14. The camera module of claim 11 , wherein the fourth lens is concavely formed at the object side, and the fifth lens is convexly formed at the object side.
15. The camera module of claim 11 , wherein the camera module satisfies a condition of 0.5<f1/f<1.5, when an overall focal distance of the lens group is f, and a focal distance of the first lens is f1.
16. The camera module of claim 11 , wherein the camera module satisfies a condition of 0.5<T/f<1.5, when an overall focal distance of the lens group is f, and a distance from the object side to an image-forming surface of the first lens is T.
17. The camera module of claim 11 , wherein the camera module satisfies a condition of 1.6<N2<1.7, when a refractive index of the second lens is N2.