Patent ID: 11860449
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical imaging system comprising:
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens 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 side of the optical imaging system,
wherein the first lens has 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,
the second lens has a convex object-side surface in a paraxial region thereof and a concave image-side surface in a paraxial region thereof,
the third lens has a convex object-side surface in a paraxial region thereof and a concave image-side surface in a paraxial region thereof,
the fourth lens has a convex object-side surface in a paraxial region thereof,
the seventh lens has a negative refractive power and a concave image-side surface in a paraxial region thereof,
the optical imaging system satisfies a conditional expression Fno<2.3, where Fno is an F-number of the optical imaging system, and
the optical imaging system satisfies a conditional expression n2+n3+n4>4.85, where n2 is a refractive index of the second lens, n3 is a refractive index of the third lens, and n4 is a refractive index of the fourth lens.