Lens module
A lens module may include a first lens having positive refractive power, a second lens having refractive power, a third lens having positive refractive power, a fourth lens having refractive power, a fifth lens having refractive power, a sixth lens having refractive power, and a seventh lens having negative refractive power. An inflection point may be formed on an image-side surface of the sixth lens. A turning point may be formed on an image-side surface of the seventh lens. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are disposed in a sequential order from the first lens to the seventh lens.
1. A lens module comprising:
a first lens having positive refractive power;
a second lens having refractive power;
a third lens having negative refractive power;
a fourth lens having positive refractive power;
a fifth lens having positive refractive power;
a sixth lens having negative refractive power, and an image-side surface of the sixth lens is convex; and
a seventh lens having negative refractive power, an image-side surface of the seventh lens having one or more inflection points,
wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are disposed in a sequential order from the first lens to the seventh lens.
2. The lens module of claim 1 , wherein the second lens has negative refractive power.
3. The lens module of claim 1 , wherein both surfaces of the first lens are convex.
4. The lens module of claim 1 , wherein both surfaces of the second lens are concave.
5. The lens module of claim 1 , wherein an object-side surface of the third lens is convex, and an image-side surface of the third lens is concave.
6. The lens module of claim 1 , wherein an object-side surface of the fourth lens is convex, and an image-side surface of the fourth lens is concave.
7. The lens module of claim 1 , wherein an object-side surface of the fifth lens is concave, and an image-side surface of the fifth lens is convex.
8. The lens module of claim 1 , wherein an object-side surface of the sixth lens is concave.
9. The lens module of claim 1 , wherein an object-side surface of the seventh lens is convex, and the image-side surface of the seventh lens is concave.
10. The lens module of claim 1 , wherein one or more inflection points are formed on at least one of object-side and image-side surfaces of the sixth lens.
11. The lens module of claim 1 , wherein one or more turning points are formed on at least one of object-side and image-side surfaces of the seventh lens.
12. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
TTL/f< 1.40 [Conditional Expression]
where TTL is a distance from an object-side surface of the first lens to an image surface of an image sensor, and f is an overall focal length of an optical system including the first to seventh lenses.
13. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
BFL/f> 0.2 [Conditional Expression]
where BFL is a distance from the image-side surface of the seventh lens to an image surface of an image sensor, and f is an overall focal length of an optical system including the first to seventh lenses.
14. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
R 1/ f> 0.35 [Conditional Expression]
where R1 is a radius of curvature of an object-side surface of the first lens, and f is an overall focal length of an optical system including the first to seventh lenses.
15. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
−0.6<( R 11− R 12)/( R 11+ R 12)<8.0 [Conditional Expression]
where R11 is a radius of curvature of an object-side surface of the sixth lens, and R12 is a radius of curvature of an image-side surface of the sixth lens.
16. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
−2.0< R 13/ f< 1.0 [Conditional Expression]
where R13 is a radius of curvature of an object-side surface of the seventh lens, and f is an overall focal length of an optical system including the first to seventh lenses.
17. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
−10.0<( R 5− R 6)/( R 5+ R 6)<14.0 [Conditional Expression]
where R5 is a radius of curvature of an object-side surface of the third lens, and R6 is a radius of curvature of an image-side surface of the third lens.
18. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
ANG/f> 15.0 [Conditional Expression]
where ANG is an angle of view of the lens module, and f is an overall focal length of an optical system including the first to seventh lenses.
19. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression:
| f 1|<| f 3| [Conditional Expression]
where f1 is a focal length of the first lens, and f3 is a focal length of the third lens.
20. A lens module comprising:
a first lens having positive refractive power;
a second lens having refractive power;
a third lens having negative refractive power;
a fourth lens having positive refractive power;
a fifth lens having positive refractive power;
a sixth lens having refractive power; and
a seventh lens having negative refractive power, an image-side surface of the seventh lens having one or more inflection points,
wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are disposed in a sequential order from the first lens to the seventh lens,
wherein the lens module satisfies the following Conditional Expression:
1.0< f 12/ f< 2.0 [Conditional Expression]
where f12 is a synthetic focal length of the first and second lenses, and f is an overall focal length of an optical system including the first to seventh lenses.