Optical imaging system
An optical imaging system includes a first lens group and a second lens group. The first lens group includes a first lens and a second lens. The second lens group includes a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first to seventh lenses are sequentially disposed from an object side toward an imaging plane. The optical imaging system satisfies TTL/2Y<1.3, where TTL is a distance from an object-side surface of the first lens to the imaging plane, and 2Y is a diagonal length of the imaging plane.
1 . An optical imaging system comprising:
a first lens comprising a refractive power;
a second lens comprising a refractive power;
a third lens comprising a convex image-side surface;
a fourth lens comprising a refractive power;
a fifth lens comprising a refractive power;
a sixth lens comprising a concave image-side surface; and
a seventh lens comprising a concave image-side surface, wherein the first to seventh lenses are sequentially disposed from an object side toward an image plane,
wherein TTL/2Y<1.3, where TTL is a distance from an object-side surface of the first lens to the imaging plane and 2Y is a diagonal length of the imaging plane,
wherein an absolute value of a radius of curvature of an image-side surface of the third lens is greater than an absolute value of a radius of curvature of an object-side surface of the sixth lens, and
wherein a distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens is greater than a thickness of the third lens.
2 . The optical imaging system of claim 1 , wherein the first lens has a concave image-side surface.
3 . The optical imaging system of claim 1 , wherein the second lens has a convex object-side surface.
4 . The optical imaging system of claim 1 , wherein the fourth lens has a concave object-side surface.
5 . The optical imaging system of claim 1 , wherein the fifth lens has a convex object-side surface.
6 . The optical imaging system of claim 1 , wherein the sixth lens has a convex object-side surface.
7 . The optical imaging system of claim 1 , wherein the seventh lens has a convex object-side surface.
8 . An optical imaging system comprising:
a first lens comprising a refractive power;
a second lens comprising a refractive power;
a third lens comprising a refractive power;
a fourth lens comprising a refractive power;
a fifth lens comprising a convex object-side surface;
a sixth lens comprising a concave image-side surface; and
a seventh lens comprising a concave image-side surface, wherein the first to seventh lenses are sequentially disposed from an object side toward an image plane,
wherein TTL/2Y<1.3, where TTL is a distance from an object-side surface of the first lens to the imaging plane and 2Y is a diagonal length of the imaging plane,
wherein an absolute value of a radius of curvature of an image-side surface of the third lens is greater than an absolute value of a radius of curvature of an object-side surface of the sixth lens, and
wherein a distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens is greater than a thickness of the third lens.
9 . The optical imaging system of claim 8 , wherein the first lens has a concave image-side surface.
10 . The optical imaging system of claim 8 , wherein the second lens has a convex object-side surface.
11 . The optical imaging system of claim 8 , wherein the fourth lens has a convex image-side surface.
12 . The optical imaging system of claim 8 , wherein the sixth lens has a convex object-side surface.