Patent ID: 11867880
Assignee: ZHEJIANG SUNNY OPTICAL 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 positive refractive power;
a second lens having negative refractive power;
a third lens having refractive power;
a fourth lens having positive refractive power;
a fifth lens having refractive power;
a sixth lens having positive refractive power; and
a seventh lens having negative refractive power, an object-side surface of the seventh lens is a concave surface, and an image-side surface of the seventh lens is a concave surface,
wherein ImgH>6.0 mm, and

f/EPD<1.9,

where ImgH is half of a diagonal length of an effective pixel area on an imaging plane of the optical imaging system, f is a total effective focal length of the optical imaging system and EPD is an entrance pupil diameter of the optical imaging system.
wherein TTL/ImgH≤1.18, where TTL is a distance along the optical axis from an object-side surface of the first lens to the imaging plane of the optical imaging system.