Patent ID: 11921353
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An optical imaging system comprising:
a first lens having a positive refractive power, a convex object-side surface, and a concave image-side surface;
a second lens having a negative refractive power, a convex object-side surface, and a concave image-side surface;
a third lens having a convex object-side surface and a concave image-side surface;
a fourth lens having a positive refractive power;
a fifth lens having a refractive power, a convex object-side surface, and a concave image-side surface;
a sixth lens having a refractive power and a convex object-side surface; and
a seventh lens having a negative refractive power,
wherein the first to seventh lenses are sequentially disposed from an object side of the optical imaging system toward an image side of the optical imaging system,
wherein −0.5<(|Ri|−|Rj|)/(|Ri|+|Rj|)<0.5 is satisfied, where Ri is a radius of curvature of an object-side surface of the sixth lens, and Rj is a radius of curvature of an image-side surface of the sixth lens,
wherein f14>f is satisfied, where f14 is a synthesized focal length of the first to fourth lenses, and f is an overall focal length of the optical imaging system, and
wherein 1.64<Nmax≤1.75 is satisfied, where Nmax is a largest refractive index among a refractive index of the second lens, a refractive index of the third lens, and a refractive index of the fourth lens.