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:
Jan. 29, 2013
Filed:
Oct. 28, 2010
Jiaying LI, Guangdong, CN;
Jiaying Li, Guangdong, CN;
Han's Laser Technology Co., Ltd., Shenzhen, CN;
Abstract
A fixed focal length optical lens system includes a lens group and a diaphragm. The diaphragm is located in front of the lens group. The lens group includes three lenses, respectively the first, the second and the third lens, which are sequentially arranged as a 'negative-positive-positive' separated focal power system. The first lens is a plano-concave negative lens, the second lens is a positive meniscus lens, and the third lens is a double convex positive lens. All of the curved surfaces of the second lens are bent in the direction towards the diaphragm, wherein, the focal length of the entire optical system is f, the focal lengths of the first, the second and the third lens are respectively f, f, and f, and which satisfies the following requirement: −0.6<f/f<−0.4; 1.0<f/f<1.2; 0.6<f/f<0.8.