Lens module
There is provided a lens module including: a first lens having positive refractive power; a second lens having negative refractive power; a third lens having negative refractive power; a fourth lens having refractive power; a fifth lens having negative refractive power and having a shape in which an image-side surface thereof is convex; and a sixth lens having refractive power, having a shape in which an image-side surface thereof is concave, and having at least one point of inflection formed on the image-side surface thereof.
1. A lens module comprising:
a first lens having positive refractive power of which an image-side surface is convex;
a second lens having negative refractive power of which an image-side surface is concave;
a third lens having negative refractive power;
a fourth lens having refractive power;
a fifth lens having negative refractive power and having a shape in which an image-side surface thereof is convex; and
a sixth lens having refractive power, having a shape in which an image-side surface thereof is concave, and having at least one point of inflection formed on the image-side surface thereof,
wherein an optical system including the first to sixth lenses satisfies Conditional Equation 5:
| f 5/ f 1|>9.0 [Conditional Equation 5]
where f5 indicates a focal length [mm] of the fifth lens and f1 indicates a focal length [mm] of the first lens.
2. The lens module of claim 1 , wherein the first lens has a shape in which an object-side surface thereof is convex.
3. The lens module of claim 1 , wherein the fifth lens has a shape in which an object-side surface thereof is concave and the image-side surface thereof is convex.
4. The lens module of claim 1 , wherein the sixth lens has a shape in which an object-side surface thereof is convex.
5. The lens module of claim 1 , wherein an optical system including the first to sixth lenses satisfies Conditional Equation 1:
TTL/IMGH< 2.0 [Conditional Equation 1]
where TTL indicates a distance [mm] from an object-side surface of the first lens to an imaging surface and IMGH indicate a diagonal distance [mm] of the imaging surface of an image sensor.
6. The lens module of claim 1 , wherein an optical system including the first to sixth lenses satisfies Conditional Equation 2:
0.7< SL/TTL< 1.1 [Conditional Equation 2]
where SL indicates a distance from a stop to an imaging surface and TTL indicates a distance [mm] from an imaging object-side surface of the first lens to the imaging surface.
7. The lens module of claim 1 , wherein an optical system including the first to sixth lenses satisfies Conditional Equation 3:
ANG/F No.>34 [Conditional Equation 3]
where ANG indicates a field of view of the optical system and F No. indicates a numerical value indicating brightness of the optical system.
8. The lens module of claim 1 , wherein an optical system including the first to sixth lenses satisfies Conditional Equation 4:
F No.<2.4 [Conditional Equation 4]
where F No. indicates a numerical value indicating brightness of the optical system.
9. A lens module comprising:
a first lens having positive refractive power of which an image-side surface is convex;
a second lens having refractive power and having a shape in which an image-side surface thereof is concave;
a third lens having negative refractive power;
a fourth lens having refractive power;
a fifth lens having negative refractive power and having a shape in which an imaging object-side surface thereof is concave; and
a sixth lens having refractive power, having a shape in which an image-side surface thereof is concave, and having at least one point of inflection formed on the image-side surface thereof,
wherein an optical system including the first to sixth lenses satisfies Conditional Equation 5:
| f 5/ f 1|>9.0 [Conditional Equation 5]
where f5 indicates a focal length [mm] of the fifth lens and f1 indicates a focal length [mm] of the first lens.
10. The lens module of claim 9 , wherein the first lens has a shape in which an imaging object-side surface thereof is convex.
11. The lens module of claim 9 , wherein the second lens has negative refractive power.
12. The lens module of claim 9 , wherein the fifth lens has a shape in which an image-side surface thereof is convex.
13. The lens module of claim 9 , wherein the sixth lens has a shape in which an imaging object-side surface thereof is convex.
14. The lens module of claim 9 , wherein an optical system including the first to sixth lenses satisfies Conditional Equation 1:
TTL/IMGH< 2.0 [Conditional Equation 1]
where TTL indicates a distance [mm] from an imaging object-side surface of the first lens to an imaging surface and IMGH indicates a diagonal distance [mm] of the imaging surface of an image sensor.
15. The lens module of claim 9 , wherein an optical system including the first to sixth lenses satisfies Conditional Equation 2:
0.7< SL/TTL< 1.1 [Conditional Equation 2]
where SL indicates a distance from a stop to an imaging surface and TTL indicates a distance [mm] from an imaging object-side surface of the first lens to the imaging surface.
16. The lens module of claim 9 , wherein an optical system including the first to sixth lenses satisfies Conditional Equation 3:
ANG/F No.>34 [Conditional Equation 3]
where ANG indicates a field of view of the optical system and F No. indicates a numerical value indicating brightness of the optical system.
17. The lens module of claim 9 , wherein an optical system including the first to sixth lenses satisfies Conditional Equation 4:
F No.<2.4 [Conditional Equation 4]
where F No. indicates a numerical value indicating brightness of the optical system.
18. A lens module comprising:
a first lens having positive refractive power;
a second lens having negative refractive power of which an image-side surface is concave;
a third lens having negative refractive power;
a fourth lens having positive refractive power of which an object-side surface is convex;
a fifth lens having negative refractive power; and
a sixth lens having negative refractive power and having at least one point of inflection formed on an image-side surface thereof,
wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 5:
| f 5/ f 1|>9.0 [Conditional Equation 5]
where f5 indicates a focal length [mm] of the fifth lens and f1 indicates a focal length [mm] of the first lens.
19. The lens module of claim 18 , wherein the first lens has a shape in which an imaging object-side surface thereof is convex.
20. The lens module of claim 18 , wherein the second lens has a shape in which an image-side surface thereof is concave.
21. The lens module of claim 18 , wherein the third lens has a shape in which an image-side surface thereof is concave.
22. The lens module of claim 18 , wherein the fifth lens has a shape in which an imaging object-side surface thereof is concave.
23. The lens module of claim 18 , wherein the fifth lens has a shape in which an image-side surface thereof is convex.
24. The lens module of claim 18 , wherein the sixth lens has a shape in which an imaging object-side surface thereof is convex and the image-side surface thereof is concave.
25. The lens module of claim 18 , wherein the optical system including the first to sixth lenses satisfies the following Conditional Equation:
TTL/IMGH< 2.0 [Conditional Equation]
where TTL indicates a distance [mm] from an imaging object-side surface of the first lens to an imaging surface and IMGH indicates a diagonal distance [mm] of the imaging surface of an image sensor.
26. The lens module of claim 18 , wherein the optical system including the first to sixth lenses satisfies the following Conditional Equation:
0.7< SL/TTL< 1.1 [Conditional Equation]
where SL indicates a distance from a stop to an imaging surface and TTL indicates a distance [mm] from an imaging object-side surface of the first lens to the imaging surface.
27. The lens module of claim 18 , wherein the optical system including the first to sixth lenses satisfies the following Conditional Equation:
F No.<2.3 [Conditional Equation]
where F No. indicates a numerical value indicating brightness of the optical system.