Patent ID: 11971521
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 and a fourth lens,
wherein,
the first lens has negative refractive power, a convex object-side surface, and a concave image-side surface;
the second lens has refractive power;
the third lens has refractive power; and
the fourth lens has positive refractive power, a convex object-side surface, and a concave image-side surface,
wherein 0.5 μm<λ*tan θ<1.0 μm, where λ is a wavelength of a chief ray of the optical imaging system, and tan θ is a tangent of a half field-of-view of the optical imaging system.