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:
Nov. 27, 2012
Filed:
Apr. 24, 2011
Xiao-na Liu, Shenzhen, CN;
Hai-jo Huang, Tu-Cheng, TW;
Fang-ying Peng, Tu-Cheng, TW;
Sheng-an Wang, Tu-Cheng, TW;
An-tze Lee, Tu-Cheng, TW;
Xiao-Na Liu, Shenzhen, CN;
Hai-Jo Huang, Tu-Cheng, TW;
Fang-Ying Peng, Tu-Cheng, TW;
Sheng-An Wang, Tu-Cheng, TW;
An-Tze Lee, Tu-Cheng, TW;
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 system includes a first lens group with negative refraction power and a second lens group with positive refraction power. The first lens group includes a first lens with negative refraction power. The second lens group includes a second lens with positive refraction power, a third lens with positive refraction power, a fourth lens with negative refraction power, and a fifth lens with positive refraction power. The zoom projection lens system satisfies the following formulas: 1.9<|F1/Fw|<2.1, 0.5<|f4/Fw|<0.8, 0.95<|f5/Fw|<1.2, where 'F1', 'f4' and “f5” are respectively the effective focal lengths of the first lens group, the fourth lens and the fifth lens, “Fw” is the effective focal lengths of the zoom projection lens system in the wide angle state.