Optical imaging system
An optical imaging system includes a first lens including a negative refractive power and a convex object-side surface, and a second lens including a convex object-side surface and a convex image-side surface. The optical imaging system also includes a third lens including a negative refractive power and a convex object-side surface, a fourth lens including a convex image-side surface, a fifth lens, and a sixth lens including an inflection point formed on an image-side surface thereof. The first to sixth lenses are sequentially disposed in an optical-axis direction.
1 . An optical imaging system, comprising:
a first lens comprising negative refractive power;
a second lens comprising a refractive power;
a third lens comprising a convex object-side surface;
a fourth lens comprising a refractive power;
a fifth lens comprising a refractive power; and
a sixth lens comprising negative refractive power and a convex object-side surface,
wherein the first to sixth lenses are sequentially disposed in an optical-axis direction,
wherein an absolute value of a radius of curvature of the object-side surface of the third lens is greater than an absolute value of a radius of curvature of an image-side surface of the second lens,
wherein a thickness along an optical axis of the second lens is greater than a thickness along an optical axis of the sixth lens, and
wherein the sixth lens has an inflection point formed on an object-side surface or an image-side surface of the sixth 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 first lens has a concave image-side surface.
4 . The optical imaging system of claim 1 , wherein the second lens has a convex object-side surface.
5 . The optical imaging system of claim 1 , wherein the third lens has a concave image-side surface.
6 . The optical imaging system of claim 1 , wherein the fifth lens has a convex 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 refractive power;
a third lens comprising negative refractive power and a convex object-side surface;
a fourth lens comprising a refractive power;
a fifth lens comprising a refractive power; and
a sixth lens comprising negative refractive power,
wherein the first to sixth lenses are sequentially disposed in an optical-axis direction,
wherein an absolute value of a radius of curvature of the object-side surface of the third lens is greater than an absolute value of a radius of curvature of an image-side surface of the second lens,
wherein a thickness along an optical axis of the fourth lens is greater than a thickness along an optical axis of the second lens, and
wherein the sixth lens has an inflection point formed on an object-side surface or an image-side surface of the sixth 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 first lens has a concave image-side surface.
12 . The optical imaging system of claim 9 , wherein the second lens has a convex object-side surface.
13 . The optical imaging system of claim 9 , wherein the third lens has a concave image-side surface.
14 . The optical imaging system of claim 9 , wherein the fifth lens has a convex object-side surface.
15 . The optical imaging system of claim 9 , wherein the fifth lens has a convex image-side surface.
16 . The optical imaging system of claim 9 , wherein the sixth lens has a concave image-side surface.