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:
Jul. 29, 2014
Filed:
Mar. 07, 2012
Applicant:
Hsiang-ho Chou, Taipei, TW;
Inventor:
Hsiang-Ho Chou, Taipei, TW;
Assignee:
Ability Enterprise Co., Ltd., Taipei, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 15/14 (2006.01); G02B 13/02 (2006.01); G02B 15/177 (2006.01);
U.S. Cl.
CPC ...
G02B 15/177 (2013.01);
Abstract
An embodiment of this invention provides a zoom lens that primarily comprises, in order from an object side to an image-forming side, a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having positive refractive power. The second lens group comprises several lenses, in which the focal length of the first lens from the object side is efl3, the focal length of the second lens from the object side is efl4, and efl3 and efl4 satisfy: 0<efl3/efl4<0.3.