Patent ID: 11914224
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical imaging system comprising:
a first lens having a positive refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof;
a second lens having negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof;
a third lens having a positive refractive power;
a fourth lens having a negative refractive power and a concave image-side surface in a paraxial region thereof;
a fifth lens having a negative refractive power;
a sixth lens having a positive refractive power; and
a seventh lens having a negative refractive power,
wherein the first to seventh lenses are sequentially disposed in ascending numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system,
wherein 0<f1/f<2 is satisfied, where f1 is a focal length of the first lens, and f is a focal length of the optical imaging system,
−3.5<f2/f<0 is satisfied, where f2 is a focal length of the second lens,
f3/f>1.5 is satisfied, where f3 is a focal length of the third lens,
−9<f4/f<0 is satisfied, where f4 is a focal length of the fourth lens,
74°<FOV<90° is satisfied, where FOV is a field of view of the optical imaging system,
the second lens and the fourth lens each have a refractive index greater than 1.66, and
15<v1-v3<45 is satisfied, where v1 is an Abbe number of the first lens, and v3 is an Abbe number of the third lens.