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:
Jun. 17, 2025
Filed:
Nov. 29, 2019
Jiangxi Jingchao Optical Co., Ltd., Nanchang, CN;
JIANGXI JINGCHAO OPTICAL CO., LTD, Nanchang, CN;
Abstract
Disclosed is an optical system () sequentially comprising, from an object side to an image side, a first lens (L) having a positive refraction power, a second lens (L), a third lens (L) and a fourth lens (L). An image side surface (S) of the fourth lens (L) is a concave surface on an optical axis, both an object side surface (S) and the image side surface (S) of the fourth lens (L) are aspheric surfaces, and at least one of the object side surface (S) and the image side surface (S) of the fourth lens (L) has a point of inflexion. The optical system () comprises a stop (STO), the stop (STO) being arranged between the object side of the first lens (L) and the fourth lens (L), and the optical system () satisfies: 0.5<SL/TTL<0.9, and −1<SAG31/CT3<0.