Imaging lens system

1 . An imaging lens system, comprising:

a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, sequentially disposed from an object side,

wherein the imaging lens system comprises a total of seven lenses with refractive power,

wherein the fourth lens has a convex object-side surface, the fifth lens has a convex object-side surface and a concave image-side surface, and the seventh lens has a convex object-side surface in a paraxial region,

wherein a field of view (FOV) is wider than 85 degrees and narrower than 160 degrees,

wherein a distance (TTL) from an object-side surface of the first lens to an imaging plane is greater than 6.0 mm and less than 9.0 mm, and

wherein 1.0<TTLw/TTLt<1.1,

where TTLw is a distance from an object-side surface of the first lens to the imaging plane in a wide-angle mode of the imaging lens system, and TTLt is a distance from an object-side surface of the first lens to the imaging plane in a telephoto mode of the imaging lens system.

2 . The imaging lens system of claim 1 , wherein the first lens has negative refractive power.

3 . The imaging lens system of claim 1 , wherein the fourth lens has positive refractive power.

4 . The imaging lens system of claim 1 , wherein the sixth lens has a concave object-side surface.

5 . The imaging lens system of claim 1 , wherein the following conditional expression is satisfied,

25<FOVw/fw<60,

where FOVw is a field of view in a wide-angle mode of the imaging lens system, and fw is a focal length in a wide-angle mode of the imaging lens system.

6 . The imaging lens system of claim 1 , wherein the following conditional expression is satisfied,

15<FOVw/TTLw<25,

where FOVw is a field of view in a wide-angle mode of the imaging lens system.

7 . The imaging lens system of claim 1 , wherein the following conditional expression is satisfied,

2.0<D12/D45<17,

where D12 is a distance from an image-side surface of the first lens to an object-side surface of the second lens, and D45 is a distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens.

8 . A camera module comprising:

the imaging lens system of claim 1 ; and

an image sensor having the imaging plane disposed in a position in which light incident through the first lens to the seventh lens is formed.

9 . An imaging lens system, comprising:

a first lens having negative refractive power and a convex object-side surface;

a second lens having negative refractive power and a convex object-side surface;

a third lens having refractive power;

a fourth lens having refractive power, a convex object-side surface, and a concave image-side surface;

a fifth lens having refractive power;

a sixth lens having refractive power and a concave object-side surface; and

a seventh lens having negative refractive power and a convex object-side surface in a paraxial region,

wherein the first to seventh lenses are sequentially disposed with an air gap from an object side, and the imaging lens system has a total of seven lenses with refractive power.

10 . The imaging lens system of claim 9 , wherein the third lens has a convex image-side surface.

11 . The imaging lens system of claim 9 , wherein the fifth lens has a concave image-side surface.

12 . The imaging lens system of claim 9 , wherein the sixth lens has a convex image-side surface.

13 . The imaging lens system of claim 9 , wherein the seventh lens has a shape in which an inflection point is formed on at least one of an object-side surface and an image-side surface.

14 . The imaging lens system of claim 9 , wherein at least one of the following conditional expressions are satisfied,

-

0.1

<

lmgHT

/

fG

⁢

3

<

0.2

,

0.6

<

R

⁢

1

/

lmgHT

<

0.7

,

and

1.2

<

VG

⁢

2

/

VG

⁢

3

<

1.3

,

where ImgHT is a height of an imaging plane, fG3 is a composited focal length of the fifth lens to the seventh lens, R1 is a radius of curvature of an object-side surface of the first lens, VG2 is an average of Abbe numbers of the second lens to the fourth lens, and VG3 is an average of Abbe numbers of the fifth lens to the seventh lens.

15 . A camera module comprising:

the imaging lens system of claim 9 ; and

an image sensor having an imaging plane disposed in a position in which light incident through the first lens to the seventh lens is formed.

16 . An imaging lens system, comprising:

a first lens group, a second lens group, and a third lens group disposed on an optical axis in this order from an object side,

wherein a first lens of the first lens group has a convex object-side surface,

wherein the first lens group and the second lens group are movable relative to each other in an optical axis direction between a wide-angle mode position and a telephoto mode position,

wherein a field of view (FOV) is wider than 80 degrees, and the imaging lens system has a total of seven lenses with refractive power, and

wherein the second lens group comprises a second lens through a fourth lens, and the third lens group comprises a fifth lens through a seventh lens disposed in this order.

17 . The imaging lens system of claim 16 , wherein a distance (TTL) from an object-side surface of a first lens of the first lens group to an imaging plane is less than or equal to 7.5 mm.

18 . The imaging lens system of claim 16 , wherein the third lens has a convex image-side surface.

19 . The imaging lens system of claim 16 , wherein the fourth lens has a convex object-side surface.

20 . The imaging lens system of claim 16 , wherein the fifth lens has a convex object-side surface.

21 . A camera module comprising:

the imaging lens system of claim 16 ; and

an image sensor having an imaging plane disposed in a position in which light incident through the first lens group to the third lens group is formed.