Patent · US Active

Optical imaging system having lenses of −+−+ refractive powers

US11175478B2 · kind B2 · utility

0Cited by

0References

12Claims

0Family size

Assignee

Zhejiang Sunny Optical Co., Ltd · CN

Inventors

Lin Huang · 丈亭镇, CN
Xinquan Wang · Zhejiang, CN

Key dates

Filing date	Mar 5, 2019
Grant date	Nov 16, 2021
Priority date	—
Expiry date	Nov 22, 2039

Classification

Technology area (CPC G)Physics
CPC primaryG02B13/14
WIPO fieldOptics
WIPO sectorInstruments

Abstract

The present disclosure discloses an optical imaging system. The imaging system sequentially includes, from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, and a fourth lens. The first lens has a negative refractive power; the second lens has a positive refractive power or a negative refractive power; the third lens has a positive refractive power or a negative refractive power, and an image-side surface of the third lens is a concave surface; the fourth lens has a positive refractive power, and an image-side surface of the fourth lens is a concave surface. A total effective focal length f of the optical imaging system and an entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD≤1.60.

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