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:
Nov. 20, 2018
Filed:
May. 23, 2017
Sintai Optical (Shenzhen) Co., Ltd., ShenZhen, Guangdong Province, CN;
Asia Optical Co., Inc., Taichung, TW;
Chia-Hung Sun, Taichung, TW;
SINTAI OPTICAL (SHENZHEN) CO., LTD., Shenzhen, Guandong Province, CN;
ASIA OPTICAL CO., INC., Taichung, TW;
Abstract
A projection lens assembly includes a first lens group, a second lens group, a third lens group and a fourth lens group, all of which are arranged in order from a projection side to an image source side along an optical axis. The first lens group is with negative refractive power. The second lens group is with positive refractive power and includes a projection side surface and an image source side surface, wherein both of the projection side surface and the image source side surface are convex surfaces. The third lens group includes a convex surface facing the projection side. The fourth lens group is with positive refractive power and includes a convex surface facing the image source side. The projection lens assembly satisfies: 1.4<F<3.5, wherein F is an F-number of the projection lens assembly.