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:
Oct. 18, 2016
Filed:
Oct. 07, 2015
Coretronic Corporation, Hsin-Chu, TW;
Tao-Hung Kuo, Hsin-Chu, TW;
Tzu-Yuan Lin, Hsin-Chu, TW;
Ching-Chuan Wei, Hsin-Chu, TW;
Chuan-Te Cheng, Hsin-Chu, TW;
Coretronic Corporation, Hsin-Chu, TW;
Abstract
A fixed-focus lens including a first lens group, a second lens group and an aperture stop is provided. The first lens group has a positive refractive power, and includes a first lens, a second lens and a third lens arranged in sequence from a magnified side to a reduced side. The second lens group has a positive refractive power, and includes a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from the magnified side to the reduced side. A product of a refractive power and a slope of a refractive index changing with a temperature change of any one lens of the second lens group is P×(dn/dt), and a sum of P×(dn/dt) of the lenses of the second lens group is less than 0. The aperture stop is disposed between the first lens group and the second lens group.