Patent ID: 11906708
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 second lens having a concave image-side surface in an optical axis region thereof;
a third lens having a concave object-side surface in an optical axis region thereof;
a fourth lens having a positive refractive power and a convex image-side surface in an optical axis region thereof; and
a fifth lens having a positive refractive power and a concave image-side surface in an optical axis region thereof,
wherein the first through fifth lenses are sequentially disposed in ascending numerical order along an optical axis from an object side of the optical imaging system toward an imaging plane of the optical imaging system,
an absolute value of a radius of curvature of an object-side surface of the fourth lens in an optical axis region thereof is greater than an absolute value of a radius of curvature of an image-side surface of the third lens in an optical axis region thereof, and
0≤|n1−n2|≤0.20, where n1 is a refractive index of the first lens, and n2 is a refractive index of the second lens.