Patent ID: 11914222
Assignee: ZHEJIANG SUNNY OPTICS CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical imaging system, sequentially from an object side to an image side of the optical imaging system along an optical axis, comprising:
a first lens having refractive power;
a second lens having negative refractive power;
a third lens having negative refractive power;
a fourth lens having refractive power, a convex image-side surface; and
a fifth lens having refractive power,
wherein 1.0<TTL/ImgH<1.5,
where TTL is a distance along the optical axis from an object-side surface of the first lens to an imaging plane of the optical imaging system, and ImgH is half of a diagonal length of an effective pixel area on the imaging plane of the optical imaging system; and

5.5<ΣAT/T34<9.0,

where ΣAT is a sum of the spaced intervals along the optical axis between each two adjacent lenses of the first lens to the fifth lens, and T34 is a spaced interval between the third lens and the fourth lens along the optical axis.