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 and an image-side surface being concave in an optical axis;
a second lens having refractive power;
a third lens having positive refractive power;
a fourth lens having refractive power and comprising an object-side surface being concave on the optical axis and an image-side surface being convex on the optical axis;
a fifth lens having refractive power and comprising an object-side surface being concave on the optical axis;
a sixth lens having refractive power and comprising an image-side surface being concave on the optical axis; 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 fourth lens has negative refractive power.
3. The lens module of claim 1 , wherein the sixth lens has negative refractive power.
4. The lens module of claim 1 , wherein an object-side surface of the first lens is convex.
5. The lens module of claim 1 , wherein an object-side surface of the second lens is convex, and an image-side surface of the second lens is concave.
6. The lens module of claim 1 , wherein both surfaces of the third lens are convex.
7. The lens module of claim 1 , wherein 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 convex.
9. The lens module of claim 1 , wherein at least one or more inflection points are formed on at least one of object-side and image-side surfaces of the sixth lens.
10. The lens module of claim 1 , wherein at least one or more turning points formed on at least one of object-side and image-side surfaces of the seventh lens.
11. The lens module of claim 1 , wherein at least one of the first to seventh lenses is formed of plastic.
12. The lens module of claim 1 , wherein at least one of object-side and image-side surfaces of at least one of the first to seventh lenses is aspheric.
13. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression: 1.0<f12/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.
14. 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, 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: BFL/f>0.2 [Conditional Expression] where BFL is a distance from the image-side surface of the seventh lens to an image surface, and f is an overall focal length of an optical system including the first to seventh lenses.
16. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression: R1/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.
17. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression: −0.6<(R11−R12)/(R11+R12)<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.
18. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression: −2.0<R13/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.
19. The lens module of claim 1 , wherein the lens module satisfies the following Conditional Expression: −10.0<(R5−R6)/(R5+R6)<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.
20. 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.
21. A lens module comprising:
a first lens having positive refractive power;
a second lens having positive 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 comprising an image-side surface being concave; 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.
22. The lens module of claim 21 , wherein the fourth lens has negative refractive power.
23. The lens module of claim 21 , wherein the fifth lens has positive refractive power.
24. The lens module of claim 21 , wherein the sixth lens has negative refractive power.
25. The lens module of claim 21 , wherein an object-side surface of the first lens is convex, and an image-side surface of the first lens is concave.
26. The lens module of claim 21 , wherein an object-side surface of the second lens is convex, and an image-side surface of the second lens is concave.
27. The lens module of claim 21 , wherein both surface of the third lens are convex.
28. The lens module of claim 21 , wherein an object-side surface of the fourth lens is concave, and an image-side surface of the fourth lens is convex.
29. The lens module of claim 21 , wherein an object-side surface of the fifth lens is concave, and an image-side surface of the fifth lens is convex.
30. The lens module of claim 21 , wherein an object-side surface of the sixth lens is convex.
31. The lens module of claim 21 , wherein one or more inflection points are formed on at least one of object-side and image-side surfaces of the sixth lens.
32. The lens module of claim 21 , wherein one or more turning points are formed on at least one of object-side and image-side surfaces of the seventh lens.
33. The lens module of claim 21 , wherein at least one of object-side and image-side surfaces of at least one of the first to seventh lenses is aspheric.
34. The lens module of claim 21 , wherein the lens module satisfies the following Conditional Expression: 1.0<f12/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.
35. The lens module of claim 21 , 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, and f is an overall focal length of an optical system including the first to seventh lenses.
36. The lens module of claim 21 , 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, and f is an overall focal length of an optical system including the first to seventh lenses.
37. The lens module of claim 21 , wherein the lens module satisfies the following Conditional Expression: R1/f<(R11-R12)/(R11+R12)<8.0 [Conditional Expression] where R1 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.
38. The lens module of claim 21 , wherein the lens module satisfies the following Conditional Expression: −0.6<(R11−R12)/(R11+R12)<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.
39. The lens module of claim 21 , wherein the lens module satisfies the following Conditional Expression: −2.0<R13/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.
40. The lens module of claim 21 , wherein the lens module satisfies the following Conditional Expression: −10.0<(R5−R6)/(R5+R6)<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.
41. The lens module of claim 21 , 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.
42. A lens module, comprising:
seven lenses including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, in order from an object side to an image side,
wherein:
an object-side surface of the first lens is convex in an optical axis, an image-side surface of the first lens is concave in the optical axis,
an image-side surface of the second lens is concave in the optical axis,
an object-side surface of the third lens is convex in the optical axis, an image-side surface of the third lens is convex in the optical axis,
an image-side surface of the fourth lens is concave in the optical axis,
an object-side surface of the fifth lens is concave in the optical axis,
an image-side surface of the sixth lens is concave on the optical axis, and
the seventh lens has a concave image-side surface in the optical axis with at least one or more inflection points.
43. The lens module of claim 42 , wherein an image-side surface of the fifth lens is convex.
44. The lens module of claim 43 , wherein the fourth and fifth lenses have a meniscus shape which is concave toward the object side.
45. The lens module of claim 43 , wherein the third lens, fourth lens, fifth lens and sixth lens have a meniscus shape.
46. The lens module of claim 42 , wherein an object-side surface of the second lens is convex.
47. The lens module of claim 42 , wherein the first lens has positive refractive power, the third lens has positive refractive power, and the seventh lens has negative refractive power.
48. The lens module of claim 47 , wherein the second lens has positive refractive power.
49. The lens module of claim 42 , wherein the lens module satisfies the following Conditional Expression: 1.0<f12/f<2.0 [Conditional Expression] where f12 is a composite focal length of the first and second lenses, and f is an overall focal length of the lens module.
50. The lens module of claim 42 , wherein the lens module satisfies the following Conditional Expression: TTL/f<1.40 [Conditional Expression] where TTL is a distance from the object-side surface of the first lens to an image surface, and f is an overall focal length of the lens module.
51. The lens module of claim 42 , 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, and f is an overall focal length of the lens module.
52. The lens module of claim 42 , wherein the lens module satisfies the following Conditional Expression: R1/f>0.35 [Conditional Expression] where R1 is a radius of curvature of the object-side surface of the first lens, and f is an overall focal length of the lens module.
53. The lens module of claim 42 , wherein the lens module satisfies the following Conditional Expression: −0.6<(R11−R12)/(R11+R12)<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.
54. The lens module of claim 42 , wherein the lens module satisfies the following Conditional Expression: −2.0<R13/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 the lens module.
55. The lens module of claim 42 , wherein the lens module satisfies the following Conditional Expression: −10.0<(R5−R6)/(R5+R6)<14.0 [Conditional Expression] where R5 is a radius of curvature of the object-side surface of the third lens, and R6 is a radius of curvature of an image-side surface of the third lens.
56. The lens module of claim 42 , 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 the lens module.