Lens module
A lens module including may include: a first lens having negative refractive power; a second lens of which an object-side surface or an image-side surface is convex; a third lens of which an image-side surface is concave; a fourth lens having refractive power; a fifth lens having refractive power; and a sixth lens having an inflection point formed on an image-side surface or an object-side surface thereof. The first to sixth lenses are disposed in a sequential order from the first lens to the sixth lens.
1. A lens module comprising:
a first lens having a negative refractive power;
a second lens having a convex object-side surface or a convex image-side surface;
a third lens having a concave image-side surface;
a fourth lens having a refractive power;
a fifth lens having a refractive power, and an object-side surface having a concave paraxial region; and
a sixth lens having an inflection point formed on an image-side surface or on an object-side surface thereof,
wherein the first, second, third, fourth, fifth and sixth lenses are disposed in a sequential order, from the first lens to the sixth lens, and
wherein the lens module has a total of six lenses having a refractive power.
2. The lens module of claim 1 , wherein the first lens to the sixth lens comprise plastic.
3. The lens module of claim 1 , wherein the first lens has a concave object-side surface or a concave image-side surface.
4. The lens module of claim 1 , wherein the fourth lens has a convex image-side surface.
5. The lens module of claim 1 , wherein the fifth lens has a convex image-side surface.
6. The lens module of claim 1 , wherein the sixth lens has a convex object-side surface.
7. The lens module of claim 1 , wherein the sixth lens has a concave image-side surface.
8. The lens module of claim 1 , wherein an optical system including the first lens to the sixth lens satisfies the following relationship:
TTL/IMGH< 2;
wherein TTL is a distance from an object-side surface of the first lens to an imaging surface, and IMGH is a diagonal length of the imaging surface.
9. The lens module of claim 1 , wherein an optical system including the first lens to the sixth lens satisfies the following relationship:
0.5< SL/TTL< 1.1;
wherein SL is a distance from a stop to an imaging surface, and TTL is a distance from an object-side surface of the first lens to the imaging surface.
10. The lens module of claim 1 , wherein an optical system including the first lens to the sixth lens satisfies the following relationship:
/ ANG /(aperture f -number)>34;
wherein ANG is a viewing angle of an object.
11. The lens module of claim 1 , wherein an optical system including the first lens to the sixth lens has an aperture f-number of 2.2 or less.
12. A lens module comprising:
a first lens having a negative refractive power;
a second lens having a positive refractive power;
a third lens having a concave image-side surface;
a fourth lens having a convex image-side surface;
a fifth lens having a positive refractive power, and an object-side surface having a concave paraxial region; and
a sixth lens having a negative refractive power,
wherein the first, second, third, fourth, fifth and sixth lenses are disposed in a sequential order, from the first lens to the sixth lens, and
the lens module has a total of six lenses, each lens having a refractive power.
13. The lens module of claim 12 , wherein an optical system including the first lens to the sixth lens satisfies the following relationship:
TTL/IMGH< 2;
wherein TTL is a distance from an object-side surface of the first lens to an imaging surface, and IMGH is a diagonal length of the imaging surface.
14. The lens module of claim 12 , wherein an optical system including the first lens to the sixth lens satisfies:
0.5< SL/TTL< 1.1;
wherein SL is a distance from a stop to an imaging surface, and TTL is a distance from an object-side surface of the first lens to the imaging surface.
15. The lens module of claim 12 , wherein an optical system including the first to sixth lenses satisfies the following relationship:
ANG /(aperture f -number)>34;
wherein ANG is a viewing angle of an object.
16. The lens module of claim 12 , wherein an optical system including the first lens to the sixth lens has an aperture f-number of 2.2 or less.
17. A lens module comprising:
a first lens having a negative refractive power;
a second lens having a convex object-side surface or a convex image-side surface;
a third lens of which an image-side surface is concave in a paraxial region;
a fourth lens having a refractive power;
a fifth lens having a refractive power; and
a sixth lens having an inflection point formed on an image-side surface or on an object-side surface thereof,
wherein the first, second, third, fourth, fifth and sixth lenses are disposed in a sequential order, from the first lens to the sixth lens,
wherein the lens module has a total of six lenses, each lens having a refractive power,
wherein an optical system including the first to sixth lenses has an aperture f-number less than 2.2, and
wherein the first lens has a concave object-side surface.