Patent ID: 11885942
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 16:
17. An optical imaging system comprising:
a first lens comprising negative refractive power, and comprising a convex object-side surface;
a second lens comprising negative refractive power;
a third lens comprising positive refractive power, and comprising a concave object-side surface and a convex image-side surface;
a fourth lens comprising positive refractive power, and comprising a convex object-side surface and a convex image-side surface;
a fifth lens comprising positive refractive power, and comprising a convex object-side surface and a convex image-side surface;
a sixth lens comprising negative refractive power, and comprising a concave object-side surface and a concave image-side surface; and
a seventh lens comprising positive refractive power,
wherein the optical imaging system comprises a total of seven lenses and the first to seventh lenses are sequentially disposed from an object side toward an image side such that the fifth lens is spaced apart from the fourth lens at an optical axis,
wherein R5 is a radius of curvature of the object-side surface of the third lens, f is an overall focal length of the optical imaging system, and −15.0<R5/f<−5.0, and
wherein n3 is a refractive index of the third lens and n3<1.535.