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:
May. 21, 2019
Filed:
Jun. 12, 2017
Nanchang O-film Optical-electronic Tech Co., Ltd., Nanchang, CN;
Taro Asami, Saitama, JP;
Takeshi Kamiya, Saitama, JP;
NANCHANG O-FILM OPTICAL-ELECTRONIC TECH CO., LTD., Nanchang, CN;
Abstract
The imaging lens consists of, in order from an object side, a positive first lens L, a negative second lens L, a positive third lens L, and a positive fourth lens L. Conditional expressions relating to a focal length f of an entire system, a combined focal length f234 of the second lens Lto the fourth lens L, an Abbe number νd1 of the first lens L, an Abbe number νd2 of the second lens L, a radius of curvature R1 of a surface of the first lens Lon the object side, and a radius of curvature R2 of a surface of the first lens Lon an image side: 0.4<f/f234<2; νd1<50; 5<νd1−νd2<26; −5<(R1+R2)/(R1−R2)<−0.9 are satisfied.