Optical imaging system
An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens having a negative refractive power, a fifth lens having a negative refractive power, a sixth lens, and a seventh lens having a positive refractive power. The first lens to seventh lens are sequentially disposed in a direction from an object side toward an imaging plane.
1 . An optical imaging system, comprising:
a first lens comprising a refractive power;
a second lens comprising a convex object-side surface;
a third lens comprising a refractive power;
a fourth lens comprising negative refractive power and a concave image-side surface;
a fifth lens comprising a refractive power;
a sixth lens comprising a refractive power; and
a seventh lens comprising a refractive power,
wherein the first to seventh lenses are sequentially disposed from an object side to an image plane,
wherein a radius of curvature of an object-side surface of the third lens is greater than a radius of curvature of an image-side surface of the first lens,
wherein a thickness along an optical axis of the first lens is greater than a thickness along an optical axis of the sixth lens and a thickness along an optical axis of the seventh lens, and
wherein a thickness along an optical axis of the third lens is greater than a thickness along an optical axis of the fourth lens.
2 . The optical imaging system of claim 1 , wherein the first lens has a convex object-side surface.
3 . The optical imaging system of claim 1 , wherein the second lens has a concave image-side surface.
4 . The optical imaging system of claim 1 , wherein the third lens has a convex object-side surface.
5 . The optical imaging system of claim 1 , wherein the fourth lens has a convex object-side surface.
6 . The optical imaging system of claim 1 , wherein the fifth lens has a concave object-side surface.
7 . The optical imaging system of claim 1 , wherein the fifth lens has a convex image-side surface.
8 . The optical imaging system of claim 1 , wherein the sixth lens has a concave image-side surface.
9 . An optical imaging system, comprising:
a first lens comprising a refractive power;
a second lens comprising a convex object-side surface;
a third lens comprising a refractive power;
a fourth lens comprising a refractive power and a concave image-side surface;
a fifth lens comprising a refractive power;
a sixth lens comprising a refractive power; and
a seventh lens comprising negative refractive power and a concave object-side surface,
wherein the first to seventh lenses are sequentially disposed from an object side to an image plane,
wherein a radius of curvature of an object-side surface of the third lens is greater than a radius of curvature of an image-side surface of the first lens, and
wherein a thickness along an optical axis of the first lens is greater than a thickness along an optical axis of the sixth lens and a thickness along an optical axis of the seventh lens.
10 . The optical imaging system of claim 9 , wherein the first lens has a convex object-side surface.
11 . The optical imaging system of claim 9 , wherein the second lens has a concave image-side surface.
12 . The optical imaging system of claim 9 , wherein the third lens has a convex image-side surface.
13 . The optical imaging system of claim 9 , wherein the fourth lens has a convex object-side surface.
14 . The optical imaging system of claim 9 , wherein the seventh lens has a concave image-side surface.