Imaging lens system
An imaging lens system includes a first lens having refractive power, a second lens having refractive power, a third lens having refractive power, a fourth lens having refractive power, a fifth lens having refractive power, a sixth lens having refractive power and having a convex object-side surface, a seventh lens having refractive power, and an eighth lens having refractive power, wherein a field of view (FOV) of the imaging lens system is 78-85 degrees.
1 . An imaging lens system, comprising:
a first lens having a refractive power;
a second lens having a refractive power;
a third lens having a concave image-side surface;
a fourth lens having a concave object-side surface in a paraxial region thereof and a convex image-side surface in a paraxial region thereof;
a fifth lens having a refractive power;
a sixth lens having a refractive power;
a seventh lens having a concave image-side surface; and
an eighth lens having a refractive power and a convex object-side surface in a paraxial region thereof,
wherein the first to eighth lenses are sequentially disposed from an object side toward an imaging plane,
wherein the imaging lens system includes a total number of eight lenses with refractive power,
wherein f number≤1.8,
wherein TTL/2IMGHT≤0.78, where TTL is a distance from an object-side surface of the first lens to the imaging plane and 2IMGHT is a diagonal length of the imaging plane,
wherein a focal length of the first lens is within a range of 10 mm to 80 mm,
wherein an absolute value of a radius of curvature of the 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 second lens, and
wherein T8<D34, where T8 is a thickness of the eighth lens and D34 is a distance from the image-side surface of the third lens to an object-side surface of the fourth lens.
2 . The imaging lens system of claim 1 , wherein the first lens has a convex object-side surface.
3 . The imaging lens system of claim 1 , wherein the second lens has a convex object-side surface.
4 . The imaging lens system of claim 1 , wherein the third lens has a convex object-side surface.
5 . The imaging lens system of claim 1 , wherein the seventh lens has a convex object-side surface.