US 12,242,044 B2
Zoom lens assembly
Mengna Tang, Zhejiang (CN); Jianke Wenren, Zhejiang (CN); Fujian Dai, Zhejiang (CN); and Liefeng Zhao, Zhejiang (CN)
Assigned to Zhejiang Sunny Optics Co., Ltd., Ningbo (CN)
Filed by ZHEJIANG SUNNY OPTICS CO., LTD., Zhejiang (CN)
Filed on Dec. 9, 2021, as Appl. No. 17/546,073.
Claims priority of application No. 202011453504.0 (CN), filed on Dec. 11, 2020.
Prior Publication US 2022/0187580 A1, Jun. 16, 2022
Int. Cl. G02B 15/14 (2006.01)
CPC G02B 15/143 (2019.08) 13 Claims
OG exemplary drawing
 
1. A zoom lens assembly, sequentially comprising, from an object side to an image side along an optical axis thereof:
a first lens group, two lenses in the first lens group being spaced, wherein the first lens group is fixed;
a second lens group with a positive refractive power, three lenses in the second lens group being spaced; and
a third lens group with a negative refractive power, two lenses in the third lens group being spaced, wherein the second lens group and the third lens group move along the optical axis to implement continuous zooming;
wherein the zoom lens assembly has a wide-angle end position, a middle end position and a telephoto end position; and
EPD is an entrance pupil diameter of the zoom lens assembly, ImgH is a half of a diagonal length of an effective pixel region on an imaging surface of the zoom lens assembly, DTmax is a maximum value in effective radii of each lens in the first lens group, the second lens group and the third lens group, the EPD and the ImgH and the DTmax satisfy: EPD*ImgH/DTmax>6.5 mm; and
in the wide-angle end position, the middle end position and the telephoto end position, the difference of the EPD is less than 0.1;
the first lens group comprises a first lens and a second lens; the second lens group comprises a third lens, a fourth lens and a fifth lens; the third lens group comprises a sixth lens and a seventh lens;
the zoom lens assembly comprises a diaphragm, the diaphragm is arranged between the first lens group and the second lens group;
TTL is a total optical length of the zoom lens assembly, and the TTL and an effective focal length ft of the zoom lens assembly at the telephoto end position satisfy: TTL/ft≤0.95.