Patent ID: 11953655
Assignee: ZHEJIANG SUNNY OPTICAL CO., LTD
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical imaging system, comprising, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, each of which has refractive power,
wherein,
the first lens has positive refractive power, and the first lens is a glass lens;
an object-side surface of the second lens is a convex surface, and an image-side surface of the second lens is a concave surface; and
each of the fourth lens and the fifth lens has negative refractive power,
wherein Fno<1.4, where Fno is an aperture value of the optical imaging system;
wherein 1.5≤T67/T23<2.5,
where T67 is a spaced interval between the sixth lens and the seventh lens along the optical axis, and T23 is a spaced interval between the second lens and the third lens along the optical axis.