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:
Mar. 14, 2023
Filed:
Feb. 24, 2020
Sintai Optical (Shenzhen) Co., Ltd., ShenZhen, CN;
Asia Optical Co., Inc., Taichung, TW;
Rong-Shun Syu, Taichung, TW;
SINTAI OPTICAL (SHENZHEN) CO., LTD., Shenzhen, CN;
ASIA OPTICAL CO., INC., Taichung, TW;
Abstract
A lens assembly includes a front lens group and a rear lens group. The front lens group includes a first lens having positive refractive power and a second lens having negative refractive power. The rear lens group includes a third lens having positive refractive power and a fourth lens having negative refractive power, wherein the third lens includes a convex surface facing an object side and another convex surface facing an image side and the fourth lens includes a concave surface facing the image side. The first lens, the second lens, the third lens, and the fourth lens are arranged in order from the object side to the image side along an optical axis. The lens assembly satisfies: 13.5 mm<f+f<20 mm; wherein f is an effective focal length of the lens assembly and fis an effective focal length of the first lens.