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. 22, 2014
Filed:
Feb. 17, 2012
Masashi Yoshida, Suwa, JP;
Masashi Yoshida, Suwa, JP;
Nittoh Kogaku K.K., Nagano, JP;
Abstract
A zoom lens system has a combined focal length fw at the wide angle end and includes, in order from an object side, a first lens group with positive refractive power and combined focal length f; a second lens group with negative refractive power; a third lens group with positive refractive power; a fourth lens group with positive refractive power; and a fifth lens group with positive refractive power and including, in order from the object side, a negative biconcave lens with focal length fand a positive biconvex lens with focal length f, the negative biconcave lens and the positive biconvex lens disposed with an air space shorter than a center thickness of the negative biconcave lens in between and both surfaces of the positive biconvex lens being aspherical. The system satisfies the following conditions: 13.5<f/fw<17.5, and 1.0<|f/f|<1.5.