The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 2021
Filed:
Feb. 12, 2019
Applicant:
Zhejiang Sunny Optical Co., Ltd., Ningbo, CN;
Inventors:
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 13/00 (2006.01); G02B 9/34 (2006.01);
U.S. Cl.
CPC ...
G02B 13/004 (2013.01); G02B 9/34 (2013.01);
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.