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. 17, 2011
Filed:
Sep. 22, 2009
Kuo-chuan Wang, Hsinchu, TW;
Ching-lung Lai, Hsinchu, TW;
Kuo-Chuan Wang, Hsinchu, TW;
Ching-Lung Lai, Hsinchu, TW;
Young Optics Inc., Hsinchu, TW;
Abstract
A zoom lens includes a first lens group and a second lens group disposed between the first lens group and an image side. The first lens group has three lenses. Refractive powers of the three lenses arranged from an object side to the image side are respectively negative, negative, and positive. The second lens group has five lenses. Refractive powers of the five lenses arranged from the object side to the image side are respectively positive, negative, positive, negative, and positive. Effective focal lengths (EFL) of the first and the second groups are respectively f1 and f2. The EFL of the zoom lens is fwhen the zoom lens is switched to a wide end. The zoom lens satisfies −2.8<f1/f<−2.5 and 0.75<|f1/f2|<0.9.