Patent · US Active

Zoom lens assembly

US11796775B2 · kind B2 · utility

0Cited by

0References

14Claims

0Family size

Assignee

Zhejiang Sunny Optics Co., Ltd · CN

Inventors

Qian Zhang · Cypress, US
Yabin HU · 丈亭镇, CN
Fujian Dai · Ningbo City, CN
Liefeng Zhao · 丈亭镇, CN

Key dates

Filing date	Aug 31, 2021
Grant date	Oct 24, 2023
Priority date	—
Expiry date	Dec 23, 2041

Classification

Technology area (CPC G)Physics
CPC primaryG02B13/0055
WIPO fieldOptics
WIPO sectorInstruments

Abstract

The disclosure provides a zoom lens assembly, which sequentially includes from an object side to an image side along an optical axis: a first lens group; a second lens group with a positive refractive power, spaced from the first lens group by a first air space and movable on the optical axis; a third lens group with a positive refractive power, spaced from the second lens group by a second air space and movable on the optical axis; and a fourth lens group, spaced from the third lens group by a third air space; wherein a Total Track Length (TTL) of the zoom lens assembly and a difference Δf between an effective focal length of the zoom lens assembly at a wide end and an effective focal length of the zoom lens assembly at a tele end satisfy 2.5<TTL/|Δf|<4.0.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.