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:
Apr. 12, 2011
Filed:
Aug. 13, 2009
Kuang-ju Wang, Taipei Hsien, TW;
Chun-hsiang Huang, Taipei Hsien, TW;
Kuang-Ju Wang, Taipei Hsien, TW;
Chun-Hsiang Huang, Taipei Hsien, TW;
Hon Hai Precision Industry Co., Ltd., Tu-Cheng, New Taipei, TW;
Abstract
A projection lens includes, in the order from a large conjugate side to a small conjugate side thereof, a negative lens group having a negative refractive power and a positive lens group having a positive refractive power. The positive lens group includes, in the order from the large conjugate side to the small conjugate side of the projection lens, a front sub-group and a rear sub-group each having a positive refractive power. The projection lens satisfies the formulas: −1.35<F1/F<−0.35 and 3<F24/F<5, where F1, F24, and F correspondingly represent the effective focal lengths of the negative lens group, the rear sub-group, and the projection lens.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile