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:
Dec. 04, 2012
Filed:
Nov. 30, 2010
Hai-jo Huang, Taipei Hsien, TW;
Fang-ying Peng, Taipei Hsien, TW;
Sheng-an Wang, Taipei Hsien, TW;
Xiao-na Liu, Guangdong, CN;
Hai-Jo Huang, Taipei Hsien, TW;
Fang-Ying Peng, Taipei Hsien, TW;
Sheng-An Wang, Taipei Hsien, TW;
Xiao-Na Liu, Guangdong, CN;
Premier Image Technology(China) Ltd., Foshan, Guangdong Province, CN;
Hon Hai Precision Industry Co., Ltd., Tu-Cheng, New Taipei, TW;
Abstract
A zoom projection lens includes, in the order from the magnification side to the minification side thereof, a first lens group with negative refraction power, a second lens group with positive refraction power, a third lens group with positive refraction power, a fourth lens group with negative refraction power, and a fifth lens group with positive refraction power. The first lens group, the second lens group, the third lens group, and the fourth lens group are movably positioned. The fifth lens group is immovably positioned. The zoom projection lens satisfying the formulae: 1.0<|F1/Fw|<1.3; 2.5<|F3/Fw|<2.7; 2.81<|F5/Fw|<2.83; and 0.21<|F2/F4|<0.24, wherein F1-F5 respectively represent the effective focal lengths of the first, second, third, fourth, and fifth lens groups, Fw represents the shortest effective focal length of the zoom projection lens.