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

Claim 9:
10. 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 an effective focal length f of the optical imaging system and an effective focal length f2 of the second lens satisfy: −3<f2/f<1.5, 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≤3.17 mm and 3.04 mm≤f≤4.73 mm, where f1 is an effective focal length of the first lens.