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:
Jun. 23, 2009
Filed:
Mar. 21, 2008
Yi-hao Kang, Hsinchu, TW;
Hsin-te Chen, Hsinchu, TW;
Yi-Hao Kang, Hsinchu, TW;
Hsin-Te Chen, Hsinchu, TW;
Young Optics Inc., Hsinchu, TW;
Abstract
A fixed-focus lens including a first lens group, a second lens group and a third lens group which are arranged in sequence from an object side to an image side is provided. The first lens group has a negative refractive power and includes a first lens and a second lens arranged in sequence from the object side to the image side, and both having negative refractive powers. The first lens is an aspheric lens. The second lens group has a positive refractive power and includes a lens with positive refractive power. The third lens group has a positive refractive power and includes at least one first cemented lens. The fixed-focus lens satisfies 1.2<|f/f|<4.2 and 2.8<|f/f|<8.6, where f, fand fare effective focal lengths of the fixed-focus lens, the first lens group and the second lens respectively.