Patent · US Active

Projection lens assembly

US10969565B2 · kind B2 · utility

0Cited by

1References

20Claims

0Family size

Assignee

Zhejiang Sunny Optical Co., Ltd · CN

Inventors

Xinquan Wang · Zhejiang, CN
Yuanlin Jia · Lo Wu, CN
Lin Huang · 丈亭镇, CN

Key dates

Filing date	Feb 12, 2019
Grant date	Apr 6, 2021
Priority date	—
Expiry date	Oct 18, 2039

Classification

Technology area (CPC G)Physics
CPC primaryG02B9/36
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A projection lens assembly is provided. The projection lens assembly includes, sequentially along an optical axis from a source-side to an image side, a first lens having a positive refractive power; a second lens having a negative refractive power, where a source-side surface and an image-side surface of the second lens are concave surfaces; a third lens having a positive refractive power or a negative refractive power; and a fourth lens having a positive refractive power, where an image-side surface of the fourth lens is a convex surface. A total effective focal length f of the projection lens assembly and an effective focal length f1 of the first lens satisfy: 2.0<f/f1<3.5.

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