Lens module
A lens module includes a first lens, a second lens, and a third lens comprising a convex object-side surface and a convex image-side surface. The lens module also includes a fourth lens including a concave object-side surface and a concave image-side surface, a fifth lens including a concave object-side surface, and a sixth lens including an inflection point formed on an image-side surface thereof. The first to sixth lenses are sequentially disposed from an object side to an image side.
1. A lens module, comprising:
a first lens comprising a negative refractive power and a convex object-side surface in a paraxial region thereof;
a second lens comprising a positive refractive power or a negative refractive power;
a third lens comprising a positive refractive power, a convex object-side surface, and a convex image-side surface;
a fourth lens comprising a negative refractive power, a concave object-side surface, and a concave image-side surface;
a fifth lens comprising a positive refractive power and a concave object-side surface; and
a sixth lens comprising a negative refractive power and an inflection point formed on an image-side surface thereof,
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 second lens comprises a meniscus shape with a convex object-side surface.
3. The lens module of claim 1 , wherein the fifth lens comprises a convex image-side surface.
4. The lens module of claim 1 , wherein the sixth lens comprises a convex object-side surface.
5. The lens module of claim 1 , wherein the sixth lens comprises a concave image-side surface.
6. The lens module of claim 1 , further comprising:
a stop positioned between the second and third lenses.
7. The lens module of claim 1 , wherein 80<FOV≤120 is satisfied,
where FOV is a field of view of an optical system comprising the first to sixth lenses.
8. The lens module of claim 1 , wherein 15<V2 is satisfied,
where V2 is an Abbe number of the second lens.
9. The lens module of claim 1 , wherein the second lens comprises a positive refractive power.
10. The lens module of claim 1 , wherein the third lens has a refractive power stronger than a refractive power of the fifth lens.
11. The lens module of claim 1 , wherein the third lens has a refractive power stronger than a refractive power of the second lens and fifth lens.
12. The lens module of claim 1 , wherein the image-side surface of the sixth lens is concave in a paraxial region and gradually curves to be convex at an edge portion thereof.
13. The lens module of claim 12 , wherein 1.0<(r3+r4)/(r3−r4) is satisfied,
where r3 is a radius of curvature of an object-side surface of the second lens, and
r4 is a radius of curvature of an image-side surface of the second lens.
14. The lens module of claim 1 , wherein the second lens comprises a negative refractive power.
15. A lens module, comprising:
a first lens comprising a negative refractive power;
a second lens comprising a negative refractive power;
a third lens comprising a positive refractive power;
a fourth lens comprising a negative refractive power;
a fifth lens comprising a refractive power and a concave object-side surface in a paraxial region thereof; and
a sixth lens comprising a negative refractive power,
wherein the first to sixth lenses are sequentially disposed from an object side to an image side.
16. The lens module of claim 15 , wherein the fifth lens comprises a positive refractive power.
17. The lens module of claim 15 , wherein the fourth lens comprises a concave object-side surface.
18. The lens module of claim 15 , wherein the third lens is a convex object-side surface and a convex image-side surface.
19. The lens module of claim 15 , wherein the fourth lens comprises a concave image-side surface.
20. The lens module of claim 15 , wherein d4/d3<0.7 is satisfied,
where d3 is a thickness of the second lens, and
d4 is a distance from an image-side surface of the second lens to an object-side surface of the third lens.