Patent · US Active

Projection lens assembly

US11137573B2 · kind B2 · utility

2Cited by

3References

15Claims

0Family size

Assignee

Zhejiang Sunny Optical Co., Ltd · CN

Inventors

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

Key dates

Filing date	Dec 20, 2018
Grant date	Oct 5, 2021
Priority date	—
Expiry date	Jun 17, 2039

Classification

Technology area (CPC G)Physics
CPC primaryG02B13/16
WIPO fieldOptics
WIPO sectorInstruments

Abstract

The present disclosure discloses a projection lens assembly. The projection lens assembly includes, sequentially along an optical axis from an image-source side to an image side, a first lens having a positive refractive power or a negative refractive power; a second lens having a positive refractive power or a negative refractive power; and a third lens having a positive refractive power, wherein an image-side surface of the first lens is a convex surface. A distance TTL on the optical axis from an image-source plane of the projection lens assembly to the image-side surface of the third lens and a total effective focal length f of the projection lens assembly satisfy: TTL/f<1.4. An effective focal length f3 of the third lens and the total effective focal length f of the projection lens assembly satisfy: 0<f3/f<18.0.

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