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:
Feb. 12, 2013
Filed:
Apr. 27, 2011
Chien-hsiung Tseng, Hsinchu, TW;
Yu-hung Chou, Hsinchu, TW;
Kai-yun Chen, Hsinchu, TW;
Ying-hsiu Lin, Hsinchu, TW;
Chien-Hsiung Tseng, Hsinchu, TW;
Yu-Hung Chou, Hsinchu, TW;
Kai-Yun Chen, Hsinchu, TW;
Ying-Hsiu Lin, Hsinchu, TW;
Young Optics Inc., Hsinchu, TW;
Abstract
A fixed-focus lens disposed between an enlarged side and a reduced side is provided. An f-number of the fixed-focus lens is smaller than or equal to 2. The fixed-focus lens includes a first lens group and a second lens group. The first lens group includes a first lens, wherein the first lens is an aspheric lens. The second lens group, disposed between the first lens group and the reduced side, has a positive dioptre. The second lens group includes a second lens, wherein the second lens is an aspheric lens. The fixed-focus lens focuses by moving the first and the second lens group and satisfies 0.1<|f/f1|<1, 0.2<|f/f2|<1.5, and 1.5<L/BEL<3.5, where f, L, and BFL are respectively a focal length, a total length, and a back focal length of the fixed-focus lens, and f1 and f2 are respectively an effective focal length of the first and the second lens group.