Patent ID: 11960059
Assignee: ZHEJIANG SUNNY OPTICAL CO., LTD
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical imaging system including a first lens, a second lens, a third lens, and a plurality of subsequent lenses with refractive power and disposed sequentially along an optical axis from an object side to an image side,
wherein the first to third lenses have +−+ refractive powers, an object side surface of the first lens is convex, and an image side surface of the second lens is concave,
wherein a lens adjacent to an object side of a lens closest to an imaging plane has a positive refractive power,
wherein the lens closest to the imaging plane has a negative refractive power, and an object side surface and an image side surface of the lens closest to the imaging plane are aspheric,
wherein the total number of lenses is no greater than six,
wherein a combined focal length f23 of the second lens and the third lens and an effective focal length fn of the lens closest to the imaging plane satisfy: −1.5<f23/fn<5, and wherein a half diagonal length ImgH of an effective pixel region on the imaging plane and an effective half-aperture DTn1 of the object-side surface of the lens closest to the imaging plane satisfy: 1<ImgH/DTn1<1.6,
wherein f1≤4.35 mm and 3.04 mm≤f≤4.73 mm where f1 is an effective focal length of the first lens, and f is an effective foal length of the optical imaging system.